Share your recent Form 8802 filing experience and wait time for receiving Form 6166
Has anyone gone through the Form 8802 submission process lately? I'm curious about the current processing timeframes for getting back the Form 6166 Certificate of Residency. I submitted a client's application just two days ago, and they're already blowing up my phone asking when they'll receive it. The client needs it for some international business dealings and is getting pretty antsy. This is my first time handling this particular form, so I'm not sure what timeline to give them. The IRS website is vague as usual. Anyone have insights on current wait times or tips to speed things up? Wondering if the standard processing time has changed in the last few months.
51 comments

Ava Thompson
I've processed about a dozen Form 8802 applications this year. The current processing time is running about 4-6 weeks for the standard submission method. If your client needs it urgently, they should have requested expedited processing (for an additional fee) which can bring it down to about 2-3 weeks. Unfortunately, there's not much you can do now to speed it up unless your client has a genuinely urgent situation (like a pending contract that will expire). In those rare cases, you can try calling the IRS directly, but they're very strict about what qualifies as an emergency. Let your client know that the Form 6166 will be mailed directly to the address listed on the Form 8802, and the IRS doesn't provide status updates during processing. Setting realistic expectations now will save you both some headaches.
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Miguel Ramos
Do you know if there's any way to check the status online? The client is really getting impatient and keeps asking if I can track it somehow.
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Ava Thompson
Unfortunately there's no online tracking system for Form 8802/6166 processing. The IRS doesn't provide status updates during the review process. The only way to inquire about status is to call the phone number listed in the Form 8802 instructions, but they typically won't give specific updates unless the application has been in process for longer than the normal timeframe. I usually tell clients upfront about the wait time so they can plan accordingly.
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Zainab Ibrahim
After struggling with this exact issue last year, I discovered taxr.ai (https://taxr.ai) and it's been a game-changer for handling these international tax forms like 8802. I was in the same boat - clients constantly asking for updates and me having no clue what to tell them. Their system actually helps predict processing times based on current IRS backlog data and gives you customized timeline estimates you can share with clients. The best part is that it analyzes the form submission for potential red flags that might cause delays before you even submit, which saved me from a major headache with a client last month.
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StarSailor
Does it work for other forms too? I've got a bunch of clients with FBAR issues and I'm wondering if this could help with those timelines too.
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Connor O'Brien
Sounds interesting but how accurate are their timeline predictions really? The IRS seems so unpredictable these days I'm skeptical anything could reliably estimate their processing times.
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Zainab Ibrahim
It definitely works for other international tax forms including FBAR submissions. They have specific modules for foreign asset reporting that I've found really helpful for setting client expectations. For the timeline predictions, I've found them surprisingly accurate. They use aggregate data from thousands of submissions to estimate current processing times. In my experience, they've been within a week or so of actual processing times, which is way better than the vague "4-8 weeks" the IRS gives. Their system accounts for seasonal fluctuations and current backlog information.
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Connor O'Brien
Just wanted to update that I tried taxr.ai for a Form 8802 I submitted last month. The timeline estimate was spot on - they predicted my client would receive their Form 6166 in 34 days, and it arrived on day 32! The analysis tool also caught that I'd made a mistake in Section 3 that would have definitely caused delays. Completely worth it just for the peace of mind, and my client was impressed that I could give them such a specific timeline. Will definitely use this for all my international tax forms going forward.
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Yara Sabbagh
If your client really can't wait and needs to speak to someone at the IRS (good luck with that), try Claimyr (https://claimyr.com). I was skeptical at first but it actually works. My client was freaking out about their Form 6166 that was taking forever - we were at week 8 with no response and they needed it for a major business deal. After wasting hours on hold myself, I used Claimyr and they got me connected to an IRS agent in about 20 minutes. You can see how it works here: https://youtu.be/_kiP6q8DX5c. The agent was able to check the status and found out there was an issue with the payment that needed to be resolved.
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Keisha Johnson
How does this even work? The IRS phone system is a nightmare - I literally spent 3 hours on hold last week and got disconnected right as someone picked up.
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Paolo Rizzo
Yeah right, this sounds like fiction. If it was that easy to get through to the IRS everyone would be doing it. I've tried all the "tricks" and nothing works. What's the catch?
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Yara Sabbagh
It uses a system that continuously redials and navigates the IRS phone tree until it gets a spot in line, then calls you when it's about to connect with an agent. You don't have to sit there listening to hold music for hours. As for the skepticism, I totally get it. I thought the same thing until I was desperate enough to try it. There's no magic trick - it's just technology that automates the frustrating part of calling the IRS. The catch is that you still need to have all your documentation ready when you get connected, and some IRS departments are still impossible to reach no matter what. But for general inquiries like checking on Form 8802 status, it worked for me.
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Paolo Rizzo
I need to eat my words. After posting my skeptical comment, I was so frustrated with waiting for a Form 6166 that I tried Claimyr out of desperation. I was connected to an IRS agent in about 25 minutes (while I was making dinner, not sitting by the phone). Turns out there was an issue with my client's application that would have kept it in limbo for months, but we were able to resolve it on the call. Just got the Form 6166 yesterday - about 3 weeks after fixing the issue. Saved my client's international contract and probably my relationship with them too. Still shocked this actually worked.
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QuantumQuest
I've found that the Philly office where they process Form 8802 is actually one of the more responsive IRS departments. If you didn't request expedited processing but your client has a genuine urgency (like a pending contract with a firm deadline), you can fax a letter explaining the situation along with documentation of the deadline to the number in the instructions. Include all the details from the original submission for reference. It doesn't always work, but I've had success getting forms processed faster this way in about 50% of cases. Just make sure the urgency is legitimate and documented - they'll ignore it otherwise.
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Dmitry Kuznetsov
AuthorThat's a great tip! Do you happen to know if expedited processing can be requested after the initial submission? Or is it only available at the time of filing the 8802?
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QuantumQuest
Unfortunately, expedited processing can only be requested at the time of the initial submission. That's why the fax method is sometimes necessary as a backup. The IRS is pretty strict about this - they won't convert a standard processing request to expedited after submission. If your situation is truly urgent, the fax method with documentation is your best bet. Otherwise, you might have to submit a new Form 8802 with the expedited processing fee, but that essentially starts the clock over again.
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Amina Sy
Anyone else notice that Form 8802 processing times seem to vary depending on the country you're requesting the Form 6166 for? I've had Germany ones come back in 3 weeks while China ones took nearly 9 weeks.
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Oliver Fischer
I've noticed this too! I think it has to do with tax treaty verification. Countries with more complex tax treaties with the US seem to take longer for processing. I had a UK one process in about 4 weeks, but one for Brazil took almost 10 weeks.
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StarStrider
This is really helpful information from everyone! As someone new to handling Form 8802, I'm taking notes on all these tips. The 4-6 week standard timeframe seems consistent with what others are saying, and I'll definitely keep the expedited processing option in mind for future clients who have urgent deadlines. @Dmitry - for your current situation, it sounds like you'll need to manage your client's expectations and let them know it's likely going to be at least a month. Maybe explain that this is standard IRS processing time and not something you can control. I've found that being upfront about government processing delays usually helps clients understand it's not a reflection of your service. The tools mentioned here like taxr.ai and Claimyr sound interesting for future reference, especially if you regularly handle international tax forms. Thanks everyone for sharing your experiences!
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Kelsey Chin
Great summary of all the advice here! As another newcomer to this process, I'm wondering if there are any common mistakes to watch out for when filling out Form 8802 that might cause delays? It sounds like even small errors can add weeks to the processing time, and I want to make sure I don't run into the same issues when I inevitably have to deal with this form for my clients.
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Nathaniel Stewart
Great question! From my experience handling these forms, the most common mistakes I've seen are: 1) Incorrect or incomplete taxpayer information in Section 1 - make sure the name matches exactly what's on file with the IRS, 2) Wrong treaty country selection - double-check you're selecting the correct country for the certificate, 3) Missing signatures or dates, and 4) Incomplete payment information. The payment errors seem to cause the longest delays since they have to send it back for correction. Also, make sure the mailing address is complete and correct since that's where the Form 6166 will be sent. I always do a final review checklist before submitting to catch these issues early.
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Sara Unger
Great question! From my experience handling these forms, the most common mistakes I see are: 1) Incorrect or incomplete taxpayer information in Section 1 - make sure the name and TIN exactly match what's on file with the IRS, 2) Wrong treaty country selection or not specifying the exact treaty article being claimed, 3) Incomplete payment information or using the wrong fee amount (standard vs expedited), and 4) Not signing and dating the form properly. I always double-check the client's most recent tax return to verify their information matches exactly what I'm putting on the 8802. Also, if your client has any name changes or entity restructuring since their last filing, make sure to include documentation explaining that - otherwise it can cause significant delays while the IRS tries to match records. The IRS is particularly strict about the treaty country and article information, so I usually have clients confirm exactly which treaty benefits they're claiming before I submit.
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Mohammed Khan
Great question! From my experience handling these forms, the most common mistakes I've seen are: 1) Incomplete or inconsistent taxpayer information between the Form 8802 and supporting documents, 2) Not including all required supporting documentation (especially the tax return pages), 3) Incorrect payment amount or payment method issues, and 4) Unclear or missing treaty country designation. The address information is also critical - make sure it exactly matches what's on file with the IRS. Even small discrepancies like "St." vs "Street" can cause delays. Also double-check that the tax year you're requesting the certificate for matches the tax return information you're providing. These seem like minor details but they're the things that trip up applications most often.
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Zara Khan
Great question! From my experience, the most common errors that cause delays are: 1) Incorrect or incomplete taxpayer information (make sure the name and TIN match exactly what's on file with the IRS), 2) Wrong tax year selection (double-check which year the client needs the certificate for), 3) Incomplete foreign address information, and 4) Not including the correct fee or payment method. I've also seen delays when the treaty country selection doesn't match the actual country where the certificate will be used. Always double-check everything against the client's tax returns and the specific treaty requirements before submitting!
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Amara Torres
Good question! From my experience processing these forms, the most common mistakes I've seen are: 1) Incorrect or incomplete taxpayer identification numbers - make sure the EIN/SSN matches exactly what's on file with the IRS, 2) Wrong treaty country selection - double-check which specific tax treaty applies, 3) Incomplete business purpose description - be specific about why the certificate is needed, and 4) Payment issues - using the wrong fee amount or payment method. Also, make sure all signatures are original and the form is completely filled out with no blank required fields. Taking an extra 10 minutes to review everything can save weeks of delays!
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Ravi Malhotra
From my experience handling these forms, the most common mistakes that cause delays are: 1) Incorrect or incomplete taxpayer identification numbers - make sure the EIN/SSN matches exactly what's on file with the IRS, 2) Missing signatures or using electronic signatures instead of wet signatures, 3) Incorrect payment amounts or using the wrong fee schedule, and 4) Not including all required supporting documentation. I always double-check that the entity name on the form matches exactly how it appears on the tax returns. Even small discrepancies in punctuation or spacing can trigger a rejection. Also make sure to use the most current version of the form - the IRS updated it recently and they'll reject older versions.
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Grace Thomas
Great question! From my experience handling these forms, the most common mistakes that cause delays are: 1) Incorrect or incomplete taxpayer information in Section 1 - make sure the name matches exactly what's on file with the IRS, 2) Wrong tax year selection or missing information about the specific treaty article being claimed, 3) Incomplete foreign address information - the IRS is very picky about proper formatting, and 4) Payment issues - wrong amount or payment method problems. I always double-check that the entity name and EIN match perfectly with what's on their tax returns. The taxr.ai tool mentioned earlier actually catches these kinds of errors before submission, which has saved me from several potential delays.
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Javier Morales
Great question! From my experience handling these forms, the most common mistakes that cause delays are: 1) Incorrect or incomplete taxpayer information (make sure the name matches exactly what's on file with the IRS), 2) Missing or incorrect payment - they're very strict about the fee amount and payment method, 3) Not clearly specifying which tax treaty article you're claiming benefits under, and 4) Incomplete business address information if it's for a corporate entity. I always double-check the taxpayer's SSN/EIN against their most recent tax return, and make sure the address matches their last filed return. The IRS will kick it back for even minor discrepancies, which basically restarts your processing time. Also, if you're dealing with a partnership or corporation, make sure you have the authorized signatory sign the form - I've seen delays when the wrong person signed.
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Fatima Al-Mazrouei
Great question! From my experience with Form 8802, the most common mistakes that cause delays are: 1) Incorrect or incomplete taxpayer information - make sure the name and TIN on the form exactly match what's on file with the IRS, 2) Wrong treaty country selection - double-check you're selecting the correct country where the certificate will be used, 3) Incomplete payment information or incorrect fees - the fee structure can be confusing depending on whether you need expedited processing, and 4) Missing signatures or dates. I always create a checklist now before submitting to catch these basic errors. The IRS doesn't give you a chance to fix mistakes once submitted - they just send the whole thing back and you start over, which can add months to the process.
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Isaiah Thompson
From my experience handling these forms, the most common mistakes I've seen are: 1) Incorrect or incomplete entity information in Section II - make sure all business details match exactly what's on file with the IRS, 2) Wrong treaty country selection - double-check that you're selecting the right country and treaty article, 3) Missing signatures or using digital signatures when wet signatures are required, and 4) Payment issues - either incorrect amount or payment method problems. I've also seen delays when the mailing address doesn't match the address on the entity's tax returns. The key is to triple-check everything before submitting because even minor discrepancies can trigger a review that adds weeks to processing time.
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Axel Far
Great question! From my experience handling these forms, the most common mistakes that cause delays are: 1) Incorrect or incomplete entity information in Section 2 - make sure the legal name exactly matches IRS records, 2) Wrong treaty country selection - double-check the tax treaty exists between the US and the requested country, 3) Missing or incorrect signatures - all required parties must sign in the right places, and 4) Payment issues - incorrect fees or payment method problems. I always triple-check the entity's EIN and legal name against their most recent tax return before submitting. The IRS is very picky about exact name matches, and even small discrepancies like "Inc." vs "Incorporated" can trigger delays.
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Abby Marshall
Great question! From my experience with Form 8802, the most common mistakes that cause delays are: 1) Incomplete or inconsistent taxpayer information between the form and supporting documents, 2) Missing signatures or dates, 3) Incorrect payment amount or payment method issues, and 4) Not clearly specifying which treaty country the certificate is for. I've also seen delays when the business address doesn't match what's on file with the IRS. Double-checking everything against the client's most recent tax return before submitting can save you weeks of processing time. The form instructions are pretty detailed but easy to miss small requirements that end up being critical.
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Amara Okafor
Great question! From my experience processing these forms, the most common mistakes that cause delays are: 1) Incorrect or incomplete entity information in Section 1 - make sure the legal name matches exactly what's on file with the IRS, 2) Wrong treaty country selection - double-check the specific treaty article being claimed, 3) Incomplete payment information or using the wrong fee amount, and 4) Missing signatures or using electronic signatures where wet signatures are required. I always use a checklist now before submitting to catch these issues early. The taxr.ai tool mentioned earlier actually helps identify potential problems before submission, which has saved me from several costly delays.
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CosmicVoyager
Great question! From my experience processing these forms, the most common mistakes I see are: 1) Incorrect or incomplete taxpayer information in Section 1 (make sure the name matches exactly what's on file with the IRS), 2) Not selecting the correct treaty country or treaty provision in Section 2, 3) Forgetting to include the required supporting documentation like a copy of the tax return, and 4) Payment issues - either wrong amount or payment method not accepted. Also double-check that the client's address is current since the Form 6166 gets mailed directly to them. I always have clients verify their mailing address before submission because if it goes to an old address, you're basically starting over. The taxr.ai tool that @Zainab mentioned earlier actually helps catch these kinds of errors before submission, which has saved me from several potential delays.
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Cynthia Love
From my experience handling these forms, the most common mistakes that cause delays are: 1) Incorrect or incomplete entity information in Section 2 - make sure the legal name matches exactly what's on file with the IRS, 2) Wrong treaty country selection - double-check the tax treaty between the US and the destination country, 3) Missing signatures or dates, and 4) Payment issues - wrong amount or payment method not accepted. I've also seen delays when the address format doesn't match what the destination country expects. Always review the specific requirements for the country you're filing for, as some have particular formatting requirements that aren't obvious from the form instructions alone.
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Danielle Mays
Great question! From my experience handling these forms, the most common mistakes that cause delays are: 1) Incorrect or incomplete entity information in Section 1 - make sure the legal name exactly matches IRS records, 2) Missing or incorrect TIN/SSN - double check these numbers, 3) Incomplete foreign address formatting in Section 2 - the IRS is picky about how foreign addresses are written, and 4) Not including the correct payment amount or method. I've also seen delays when the treaty country selection doesn't match the actual business purpose. Always double-check everything against the instructions before submitting, and consider having a colleague review it if it's your first time with a particular country's requirements.
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Mila Walker
Great question! From my experience, the most common mistakes that cause delays are: 1) Incorrect or incomplete taxpayer information (make sure SSN/EIN matches exactly with IRS records), 2) Wrong tax year selection - you need to pick a year where the taxpayer actually filed a return, 3) Incomplete treaty country information - be very specific about which treaty article applies, and 4) Payment issues - the check amount must be exact including any expedited processing fees. Also double-check that all signatures are in blue ink as required. I've seen applications kicked back for seemingly minor things like using black ink or having slightly illegible signatures.
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Hazel Garcia
Great question! From my experience, the most common mistakes that cause delays are: 1) Incorrect or incomplete entity information in Section 1 - make sure the legal name matches exactly what's on file with the IRS, 2) Missing or incorrect TIN/EIN formatting, 3) Not checking the right boxes in Section 4 for the specific treaty benefits being claimed, and 4) Incomplete payment information or using the wrong fee amount. I've also seen delays when the signature section isn't properly completed by an authorized person. The IRS is very particular about these details, so double-checking everything before submission can save weeks of back-and-forth. @Zainab mentioned that taxr.ai can catch these errors before submission, which might be worth looking into if you're handling multiple forms.
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Nina Fitzgerald
From my experience handling these forms, the most common mistakes that cause delays are: 1) Incorrect or incomplete taxpayer information - make sure the name matches exactly what's on file with the IRS, 2) Wrong tax year selection - double-check you're requesting the certificate for the correct tax year, 3) Missing signatures or dates, 4) Incomplete payment information or incorrect fees. The IRS is very picky about accuracy on international forms. I always do a final review comparing every field against the client's tax return before submitting. Also, make sure the mailing address is complete and accurate since they mail the Form 6166 directly to that address - no PO boxes allowed for international requests.
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Ella Russell
Great question! From my experience handling these forms, the most common errors I've seen are: 1) Incorrect or incomplete taxpayer information in Section I (make sure the name matches exactly what's on file with the IRS), 2) Wrong treaty country selection - double-check the specific country and that a treaty actually exists, 3) Incomplete business purpose explanation in Section II - be specific about why the certificate is needed, and 4) Payment issues - make sure the check amount is correct and payable to "United States Treasury." The address verification is also crucial - the Form 6166 gets mailed to whatever address you put on the 8802, so triple-check that. I always have clients review the completed form before submission since they're the ones who will be waiting if there's an error!
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Sarah Jones
From my experience, the most common mistakes that cause delays are: 1) Not including all required supporting documents (especially the tax return copy), 2) Inconsistent information between the Form 8802 and supporting documents (like mismatched addresses or names), 3) Incomplete payment information or incorrect fees, and 4) Not clearly specifying which country's treaty you're requesting the certificate under. Double-check that the entity name and address exactly match what's on file with the IRS. I've also seen delays when people don't include both the individual AND business information if it's for a business entity. The IRS is very particular about having everything match perfectly.
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Ravi Sharma
Great question! From my experience helping colleagues with these forms, here are the most common mistakes that cause delays: 1. **Incorrect taxpayer identification** - Make sure the name and SSN/EIN match exactly what's on file with the IRS. Even slight variations can trigger a review. 2. **Wrong treaty country selection** - Double-check that you're selecting the correct country for the tax treaty. Some clients have multiple residencies and you need the one relevant to their specific situation. 3. **Incomplete or incorrect mailing address** - The Form 6166 gets mailed to the address on the 8802, so make sure it's complete and accurate. International addresses need to follow specific formatting. 4. **Missing supporting documentation** - Some treaty countries require additional documentation beyond the basic form. Check the instructions carefully for your specific country. 5. **Payment errors** - Wrong fee amount or payment method can cause immediate rejection and restart the whole process. I always recommend having someone else review the form before submission, especially for your first few. It's saved me from several potential headaches!
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Jade Lopez
Great question! From my experience handling these forms, here are the most common mistakes that cause delays: 1) Incorrect or incomplete entity information - make sure the legal name exactly matches IRS records, 2) Wrong tax treaty country selection - double-check which specific treaty applies, 3) Incomplete payment information - the fee structure changed recently so verify current amounts, 4) Missing signatures or dates - seems obvious but it happens more than you'd think. Also, make sure all supporting documentation is clearly legible if you're submitting copies. The IRS will send the whole thing back for any of these issues, which basically restarts your processing clock. I learned this the hard way on my first few submissions!
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Axel Far
Great question! From my experience, the most common mistakes that cause delays are: 1) Incorrect or incomplete entity information in Section II - make sure the legal name matches exactly what's on file with the IRS, 2) Wrong treaty country selection - double-check which specific treaty applies, 3) Missing or incorrect signatures and dates, and 4) Payment issues - the fee has changed a few times recently so verify the current amount. I've also seen delays when people don't include all required supporting documentation. The IRS is very picky about these forms since they're used for international treaty benefits, so accuracy is crucial. Always double-check everything before submitting!
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Dylan Campbell
Great question! From my experience, the most common mistakes that cause delays are: 1) Incorrect or incomplete taxpayer identification numbers - make sure the EIN/SSN matches exactly what's on file with the IRS, 2) Wrong treaty country selection - double-check which specific treaty applies, 3) Incomplete payment information or wrong fees (standard vs expedited), and 4) Missing signatures or dates. I've also seen delays when the business address doesn't match what the IRS has on record. Always verify the client's current address with the IRS before submitting. The form instructions are actually pretty detailed about required documentation, so read through them carefully rather than rushing through the submission.
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Dominic Green
From my experience handling these forms, the most common mistakes that cause delays are: 1) Inconsistent entity names between the Form 8802 and supporting tax returns - make sure they match exactly, 2) Missing or incorrect signatures, especially for entities where authorized signers need to be clearly documented, 3) Incomplete address information - the IRS is very picky about this, and 4) Not including all required supporting documentation like copies of relevant tax returns. I also learned the hard way that if you're requesting certificates for multiple tax years, each year needs its own separate Form 8802. Double-checking these basics before submission can save you weeks of back-and-forth with the IRS.
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Liam Sullivan
Great question! From my experience processing these forms, the most common mistakes I've seen are: 1) Incorrect or incomplete taxpayer identification numbers - make sure the EIN/SSN matches exactly what's on file with the IRS, 2) Wrong tax year selection - double-check you're requesting the certificate for the correct year, 3) Incomplete address information - the mailing address needs to be complete and accurate since that's where the Form 6166 gets sent, and 4) Missing signatures or dates. Also, if your client has any recent address changes with the IRS, make sure those are updated before submitting the 8802, otherwise the certificate might get sent to an old address. Taking an extra 10 minutes to review these details can save weeks of delays!
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Talia Klein
Great question! From my experience, the most common errors that cause delays are: 1) Incorrect entity information in Section 1 - make sure the legal name exactly matches IRS records, 2) Missing or incorrect treaty country selection in Section 2, 3) Incomplete payment information or using the wrong fee amount, and 4) Not signing and dating the form properly. I've also seen delays when the address format doesn't match what the foreign country expects - some countries are very particular about how addresses should be formatted on the Form 6166. Double-check everything against the instructions and consider having a colleague review it before submission. The small extra time upfront can save weeks of processing delays later.
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Mia Rodriguez
Great question! From my experience, the most common mistakes that cause delays are: 1) Incorrect or incomplete taxpayer information (make sure SSN/EIN matches exactly with IRS records), 2) Wrong treaty country selection - double-check which specific treaty applies, 3) Incomplete payment information or using the wrong fee amount, and 4) Not providing sufficient documentation for the residency claim. I've also seen delays when the signature date is missing or the form isn't signed properly. Always double-check that all required fields are filled out completely before submitting - the IRS will reject incomplete forms and you'll have to start over.
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Ella Russell
Great question! From my experience, the most common mistakes that cause delays are: 1) Incorrect or incomplete taxpayer information (make sure SSN/EIN matches exactly what's on file with IRS), 2) Wrong entity type selection - this is huge, especially for LLCs that might be taxed as partnerships or corporations, 3) Incomplete address information for where the certificate should be mailed, and 4) Not including the correct fee or having payment issues. I always double-check the entity classification section since that seems to trip up a lot of people. Also, make sure the country you're requesting the certificate for matches exactly with the tax treaty country name as recognized by the IRS - sometimes the common name differs from the official treaty name. Taking an extra 10 minutes to review these details can save weeks of processing time!
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Ryan Kim
Good question! From what I've seen in this thread and my limited experience, some common mistakes that cause delays include: incorrect payment amounts (the fees change periodically), missing signatures, incomplete Section 3 details about the specific treaty benefits being claimed, and not matching the entity name exactly as it appears on tax returns. @Zainab mentioned that taxr.ai caught a Section 3 error that would have caused delays, so that seems to be a particularly tricky area. Also make sure the mailing address is complete and accurate since the Form 6166 gets mailed directly there - I've heard of forms getting lost due to incomplete addresses.
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