Should I pay penalties and interest upfront now, or wait for the IRS letter after late filing?

Is it better to call the IRS about the First-Time Penalty Abatement right away after filing or wait until I get the official notice? And does paying the full amount now hurt my chances of getting the penalties removed later?

You should wait until you receive the official IRS notice before requesting the First-Time Penalty Abatement. They need to have your late return processed in their system before they can process any abatement requests. Paying the full amount now actually helps your case for penalty abatement. It shows good faith and that you're trying to resolve the situation promptly. The IRS looks favorably on taxpayers who've paid their tax debt in full. If they approve your abatement request later, they'll refund any penalty amounts you've paid.

How accurate was it with calculating the penalties? I tried using the IRS calculator online but it seems confusing and I'm not sure I trust the numbers I got.

Seems kinda sketchy tbh. How does it get access to your previous filing history to know if you qualify for first-time abatement? The IRS doesn't just share that data with random websites.

The penalty calculations were spot-on when I compared them to what the IRS eventually sent me. It uses the same formulas the IRS uses - 5% per month for failure to file (up to 25%), 0.5% per month for failure to pay, and the current interest rate which fluctuates quarterly. It doesn't access your previous filing history directly - you have to answer questions about your past compliance, similar to how you'd explain your situation to an IRS agent. The tool then determines if you're likely to qualify based on your answers and creates a script specific to your situation. The IRS still makes the final determination, but having all the right information prepared made the process much smoother for me.

How does that even work? Do they have some special line to the IRS or something? I don't understand how they can get through when nobody else can.

Sounds too good to be true. If this actually worked, everyone would be using it. I've heard the IRS hold times are 2+ hours these days. No way they're getting through in 20 minutes.

They don't have a special line to the IRS. They use automated technology to place the call and wait on hold so you don't have to. They essentially have systems that can handle being on hold for multiple calls simultaneously and then alert a human when an actual agent answers. I was skeptical too, but it absolutely works. The reason everyone isn't using it is that most people don't know about it. The 20-minute time was my personal experience - timing can vary depending on IRS call volume, but it's still way faster than trying to call yourself. When I tried calling on my own, I couldn't even get into the hold queue because of the high call volume. Their system knows the best times to call and keeps trying until it gets through.

Thanks for bringing this up! Should I split it into two payments - one for the base tax and one for the penalties/interest? Or just make one payment for the total amount?

I would recommend making a single payment for the total amount. The IRS will apply the payment first to tax, then to penalties, and finally to interest. A single payment simplifies the process and reduces the chance of any confusion or misapplication. Just be sure to clearly indicate the tax year 2024 on your payment, whether you're paying by check or electronically. If you end up qualifying for penalty abatement later, the IRS will refund any overpayment to you automatically once they process the abatement.

This is so important! Also take pictures of everything before you mail it and keep a complete copy. I had to provide proof of what I sent originally when the IRS lost part of my return.

This is really helpful detail about the penalty calculations! I had no idea about the quarterly interest rate changes or that the failure-to-file penalty gets reduced when both apply in the same month. Do you know if there's an easy way to track what the interest rates were for each quarter, or do I need to dig through IRS publications to get the historical rates for my calculation?

The IRS publishes the quarterly interest rates in their Revenue Rulings, but there's an easier way to find them. The IRS website has a page called "Interest Rates" under the Tax Professionals section that shows current and historical rates going back several years. You can also find them in IRS Notice publications - they usually announce rate changes about a month before each quarter begins. For 2024 specifically: Q1-Q3 was 8% annually, and Q4 dropped to 7%. The rates are based on the federal short-term rate plus 3 percentage points for individual taxpayers. If you're doing manual calculations, remember that the annual rate needs to be divided by 365 days for daily compounding calculations, since IRS interest compounds daily. @c002f024bc70 is absolutely right about paying the full amount now - every day you wait adds more interest to your balance!

The IRS publishes the historical interest rates on their website under "Interest Rates" - you can find quarterly rates going back several years. For 2024, it was 8% for Q1-Q3 and dropped to 7% for Q4. You can also find this info in IRS Revenue Rulings that come out each quarter. But honestly, if you're dealing with a complex calculation like this, those AI tools people mentioned earlier (like taxr.ai) might save you a lot of time and reduce the chance of errors. The interest calculation can get tricky when rates change mid-year, especially if you're trying to figure out daily compounding. I spent hours trying to calculate mine manually and still wasn't confident I had it right!

The IRS publishes the quarterly interest rates on their website in Revenue Rulings. You can find historical rates going back several years at irs.gov - just search for "interest rates" or look up the specific Revenue Ruling numbers. For 2024, the rates were: Q1-Q3 at 8% annually, then Q4 dropped to 7%. But honestly, unless you're dealing with a huge tax debt, the quarterly rate changes usually don't make a massive difference in your total interest calculation. The bigger impact comes from how many months you're late. Since you're already past the October deadline, getting that return filed and paid ASAP is more important than perfecting the interest calculation to the penny.

The IRS publishes the quarterly interest rates on their website under Revenue Rulings. You can find historical rates going back several years at irs.gov - just search for "quarterly interest rates" or "underpayment rates." They typically announce the rates for the upcoming quarter in advance. For 2024 specifically, the rates were 8% for Q1-Q3 and 7% for Q4. But if you want to be absolutely sure about your calculations, I'd recommend using one of the online penalty calculators that automatically applies the correct rates for each period. The IRS also has their own penalty and interest calculator on their website, though it's not the most user-friendly interface. Since you're dealing with a relatively straightforward late filing situation, the online tools should give you an accurate estimate that matches what the IRS will calculate when they process your return.

The IRS publishes the quarterly interest rates in their Revenue Rulings, but they're also posted on their website under "Interest Rates" in the Tax Professionals section. For 2024, the rates were: Q1-Q3 at 8% annually, then Q4 dropped to 7%. You can also find historical rates going back several years on that same page. The rates are always announced at least 30 days before the start of each quarter, so they're predictable once published. Much easier than digging through individual publications! For your calculation, since you're filing in December 2025, you'd need to apply the 7% rate (compounded daily) from October 16th through your payment date. The IRS compounds interest daily using the federal short-term rate plus 3 percentage points.

The IRS publishes the quarterly interest rates in Revenue Rulings, but the easiest way to find historical rates is on the IRS website under "Interest Rates" - they maintain a table going back several years. For 2024, the rates were 8% for Q1-Q3 and 7% for Q4. You can also find this info in IRS Publication 17 (Your Federal Income Tax) which gets updated annually with the current and recent historical rates. Some tax software and online calculators like the ones mentioned earlier in this thread automatically factor in the correct quarterly rates, which saves you from having to manually track down all the rate changes.

The IRS publishes the quarterly interest rates on their website under "Interest Rates" - you can find historical rates going back several years. For 2024, the rates were 8% for Q1-Q3 and 7% for Q4. The rates are always announced in advance for the upcoming quarter. You can also find them in IRS Revenue Rulings, but the website table is much easier to use. Just search "IRS quarterly interest rates" and it should come up. The rates compound daily, so for precise calculations you'd need to break it down by the exact number of days in each rate period, but for rough estimates most people just use the average rate for the year.

The IRS publishes the quarterly interest rates in Revenue Rulings, but there's an easier way! The IRS website has a page called "Interest on Underpayments and Overpayments" that shows the current and historical rates by quarter. You can also find them in IRS Publication 542. For 2024, the rates were: Q1-Q3 at 8% annually (which breaks down to about 0.022% daily), and Q4 at 7% annually. The daily rate is what matters for interest calculations since it compounds daily from the due date until paid. If you want to be super precise with your calculation, you'd need to apply 8% for the period from October 16 through September 30, 2025, then 7% from October 1, 2025 through your payment date. But honestly, for planning purposes, your estimate is probably close enough - the IRS will send you the exact calculation anyway.

The IRS publishes the quarterly interest rates in Revenue Rulings, but an easier way is to check IRS.gov - they have a page called "Interest Rates" that shows current and historical rates by quarter. You can also find them in IRS Publication 15 (Circular E) which gets updated regularly. For your specific calculation, since you're filing in late December 2025 for 2024 taxes, you'd need the rates for Q1 2025 through Q4 2025. But honestly, if you're just trying to get a close estimate to pay now, using the current rate for the whole period won't be drastically off - maybe a few dollars difference at most on a $3,500 tax bill.

The IRS publishes the quarterly interest rates in Revenue Rulings, and you can find historical rates on their website under "Interest Rates" in the tax professional section. For 2024, the rates were 8% for Q1-Q3 and 7% for Q4. But honestly, unless you're dealing with a huge tax bill, the quarterly variations usually don't make a massive difference in your total interest calculation - especially for a timeframe of just a few months like in your case. The penalty amounts are usually much more significant than the small interest rate fluctuations. If you want to be super precise, the IRS will calculate it exactly when they process your return anyway, so paying your best estimate now is still the smart move to minimize further interest accrual.

The IRS publishes the quarterly interest rates in Revenue Rulings, and you can find historical rates on their website under "Interest Rates" in the Tax Professionals section. For 2024, the rates were: Q1-Q3 at 8% annually, then Q4 dropped to 7%. But honestly, unless you're dealing with a huge tax bill, the quarterly rate changes usually don't make a massive difference in the total interest calculation - especially since you're only a couple months past the deadline. The penalty amounts are typically much larger than the interest for shorter periods like yours. If you want to be super precise, the IRS compounds interest daily using the applicable quarterly rate, but for rough estimates, using the average rate for the year gets you pretty close to the actual amount.

The IRS publishes the quarterly interest rates on their website, but it can be a pain to dig through. I usually just check IRS Revenue Ruling announcements or Notice publications that come out each quarter. For 2024, you can find them in Notice 2024-25 (Q1), Notice 2024-40 (Q2), Notice 2024-56 (Q3), and Notice 2024-72 (Q4). There are also some third-party tax sites that maintain historical interest rate tables that are easier to read than the IRS notices. The rates compound daily, so if you're doing the calculation manually, you'll need to break it down by quarter and apply the different rates to each period. It gets pretty complex, which is why a lot of people just estimate and let the IRS send the official calculation.

@c002f024bc70 The IRS publishes the quarterly interest rates in Revenue Rulings, but they're also available on their website under "Interest Rates" in the Tax Professionals section. For 2024, the rates were 8% for Q1-Q3 and 7% for Q4. You can also find historical rates going back several years on that page, which makes it easier to calculate interest for longer periods without having to hunt through individual publications. The rates are always announced before each quarter starts, so you can plan accordingly for estimated payments too.

The IRS publishes the quarterly interest rates in Revenue Rulings, and you can find historical rates on their website under "Interest Rates" in the tax professional section. For 2024 specifically, the rates were 8% for Q1-Q3 and 7% for Q4. But honestly, unless you're dealing with a huge tax bill, the quarterly fluctuations don't make a massive difference in your total interest calculation. The penalty amounts are usually the bigger concern. If you want to be super precise, IRS Notice 2024-25 has the exact effective dates for the rate changes.