Question: Is it possible to pay all my taxes at the end of the year instead of from each paycheck?

Thanks for the detailed explanation. I didn't know about the underpayment penalty or the quarterly estimated payments. So even if I set my W-4 to have minimal withholding, I'd still need to make those quarterly payments to avoid penalties?

Yes, that's correct. If you reduce your withholding, you'd need to make up for it with those quarterly estimated tax payments to avoid underpayment penalties. The IRS expects to receive your tax money throughout the year, not just at filing time. The quarterly payment system is mainly designed for self-employed people and those with significant income from sources without withholding (investments, rental income, etc.). You can use Form 1040-ES to calculate and submit these payments. Keep in mind that calculating these quarterly amounts correctly requires some tax knowledge, so be prepared to do some homework or consult with a tax professional.

Does it handle state taxes too? I live in California and they seem to have their own rules about everything.

I'm skeptical about these tax tools. How do you know it won't suggest something that gets you in trouble with the IRS? Did you have a tax pro review the recommendations?

It handles state taxes for all 50 states including California's special rules. The California calculations were actually really helpful because their withholding system works differently than federal. Regarding accuracy, the recommendations come with citations to specific IRS publications and tax code sections. I was skeptical at first too, but had my accountant review it before making changes and he was impressed with how conservative and well-documented the advice was. It's designed to optimize within safe boundaries, not push into gray areas.

How much does Claimyr cost? Seems like it would be expensive for them to sit on hold for hours.

Yeah right. How would this even work? You expect me to believe someone else waits on hold for you and then somehow transfers the call? Sounds like a scam to get people's personal tax info.

They don't charge based on hold time - it's a flat fee regardless of how long they wait. I don't want to quote the exact price since it might have changed, but it was reasonable considering the 3+ hours of hold time I didn't have to sit through. It works exactly as advertised - they call the IRS, navigate the phone tree, wait on hold, and then call your phone when they've got an agent on the line. There's a brief moment where they connect the calls. No personal info is shared with Claimyr since they're just getting you to an agent, not discussing your tax details.

The W-4 doesn't use allowances anymore. They changed the form in 2020. Now it's more complicated but also more accurate if you fill it out correctly.

You're absolutely right, and thanks for the correction. The W-4 was redesigned in 2020 and no longer uses allowances. Instead, it asks for specific dollar amounts for things like other income and deductions. The principle still stands though - if you intentionally provide incorrect information to reduce your withholding without making quarterly estimated payments, you could face penalties. The IRS has gotten much better at identifying patterns of underwithholding.

That's actually a really good point about the discipline required. Do you have any system you use to make sure you're setting aside enough each month? I could see myself being tempted to dip into the funds if they're just sitting in my account.

I keep a separate high-yield savings account just for taxes and automatically transfer 30% of every payment I receive into it. This is slightly more than I'll actually owe, which gives me a buffer. I also use a spreadsheet to track all my income and estimated tax obligations throughout the year. When quarterly payment time comes, I calculate exactly what I need to pay and transfer just that amount to my checking account for the payment. Any extra stays in the tax account as a buffer. The psychological trick that works for me is labeling the account "Not My Money" to remind myself that it belongs to the government, I'm just holding it temporarily!

This is really helpful, thank you! I didn't realize FICA taxes were mandatory withholding - good to know I can't eliminate those entirely. Your approach sounds very systematic. Quick question: when you say you calculate 110% of last year's tax liability, are you including both federal and state taxes in that calculation? And do you make separate quarterly payments to each, or is there a way to combine them? Also, what happens if your income changes significantly from the previous year? Does the safe harbor rule still protect you if you're earning much more?

Great questions! Yes, I calculate 110% separately for both federal and state taxes since they have different safe harbor rules. For federal, it's 110% of last year's tax if your AGI was over $150k (100% if under). Most states follow similar rules but some have their own thresholds. I make separate quarterly payments - federal goes to the IRS and state goes to my state tax agency. You can't really combine them since they're different entities. I use EFTPS for federal payments and my state's online portal for state payments. Regarding income changes - the safe harbor rule protects you as long as you pay the required percentage of *last year's* tax liability, regardless of what you earn this year. So if your income doubles, you're still safe from penalties as long as you hit that 110% threshold. You might owe a big chunk at filing time, but no penalties. However, if your income drops significantly, you might be overpaying throughout the year. That's why some people switch to the 90% of current year rule if they can accurately estimate their current year liability. The beauty of the safe harbor is it takes the guesswork out of it - you know exactly what to pay each quarter without having to predict your final tax bill.

This is really valuable insight from the payroll side - I hadn't thought about the HR review process or how it might affect loan applications down the road. The middle-ground approach you mentioned sounds like it might be perfect for someone like me who wants to optimize but is still nervous about going too far. When you say 80-85% of expected liability, how would someone calculate that if they don't know their exact tax situation yet? Would you recommend using last year's return as a baseline, or is there a simpler rule of thumb? Also, do you know if there are any red flags that HR departments specifically look for when reviewing W-4 changes? I want to make sure I approach this professionally and don't create unnecessary complications with my employer.

Great question about calculating that 80-85% target! I'd definitely recommend starting with last year's return as your baseline. Take your total tax liability (not what you paid or got refunded, but the actual tax owed line from your 1040), then multiply by 0.8 or 0.85. Divide that by your number of pay periods to see how much should be withheld per paycheck. For red flags HR looks for: sudden changes from maximum withholding to zero, employees claiming excessive exemptions without supporting documentation, or patterns that suggest someone is trying to avoid taxes entirely rather than optimize them. The key is being able to explain your reasoning if asked - "I want to manage my cash flow better and make quarterly payments" sounds much more professional than "I don't want to give the government a free loan." Most HR departments are fine with reasonable adjustments, especially if you can demonstrate you understand the quarterly payment requirements. Some even appreciate employees who are financially savvy enough to optimize their withholding properly! Pro tip: if you're nervous about the conversation, you could mention you're working with a tax professional or using tax software to ensure compliance - it shows you're being responsible about it.

This is exactly the kind of real-world breakdown I was hoping to see! Your numbers really help put this in perspective. I'm in a similar income range, so knowing you're only getting about $310 extra per year makes me think twice about whether the complexity is worth it. I really like your idea about starting with just federal taxes and leaving state alone for the first year. That seems like a smart way to test the waters without overcomplicating things right away. The "Tax Jail" account naming is brilliant - I can see how the psychological aspect of not considering that money as "yours" would be crucial for this to work. One question: when you say your effective hourly wage is around $15/hour, how much time are you actually spending on this throughout the year? Is it mostly upfront setup time, or do you find yourself spending time on it every quarter?

Great question about the time commitment! The upfront setup took me about 3-4 hours total - researching the safe harbor rules, calculating my quarterly amounts, setting up the separate savings account, and filling out the new W-4 for HR. During the year, I probably spend about 30 minutes each quarter making the payments (15 minutes for federal via EFTPS, 15 minutes for state). Then maybe another hour at year-end reconciling everything when I file my taxes. So roughly 6-7 hours annually for that $310 benefit. The mental overhead is harder to quantify, but there's definitely some ongoing awareness required - making sure the auto-transfers are working, checking quarterly payment due dates, etc. It's not huge, but it's there. Honestly, if I were starting over and just wanted to optimize without much hassle, I'd probably go with my own suggestion of just reducing withholding enough to get a small refund instead of a large one. Much simpler way to keep more money in your pocket throughout the year without the quarterly payment complexity. The main reason I continue doing it is that I genuinely enjoy the financial planning aspect and it helps me stay more engaged with my overall tax situation. But purely from a time-versus-money perspective, it's pretty marginal!

This is really helpful perspective from a professional - thank you! I hadn't considered some of these complexities, especially the state variations and AMT implications. Your point about the administrative burden often outweighing the financial benefit really resonates with what I've been reading in this thread. It seems like multiple people have mentioned that while it's technically possible and can work, the actual dollar amounts you gain aren't huge when you factor in the time and complexity. I'm definitely leaning toward your conservative approach now - maybe reducing withholding by 50% rather than trying to eliminate it entirely. That way I can still earn some interest on the float without diving into the deep end with quarterly estimated payments right away. Quick question: when you mention that some companies require documentation for large withholding reductions, what kind of documentation typically satisfies them? Is it usually just an explanation of your quarterly payment plan, or do they want to see more detailed tax calculations?

Most employers will accept a simple written explanation stating that you plan to make quarterly estimated tax payments to cover the reduced withholding. You don't usually need to provide detailed tax calculations unless they specifically ask. A basic statement like "I am reducing my tax withholding and will be making quarterly estimated tax payments to the IRS and state tax authority to meet my tax obligations" is typically sufficient. Some HR departments might ask you to acknowledge that you understand you're responsible for any penalties, but that's usually the extent of it. The key is being upfront and professional about it rather than trying to fly under the radar. Employers generally appreciate transparency since it protects them from potential liability issues. One thing I always tell clients: keep documentation of your quarterly payments (confirmation numbers, bank records, etc.) in case questions arise later during an audit or if your employer needs verification that you're actually following through on your stated plan.

That sounds like a really smart approach! I've been reading through this whole thread too and was honestly feeling a bit overwhelmed by all the complexities people mentioned - quarterly payments, safe harbor calculations, state variations, etc. Your middle-ground strategy of reducing withholding by 60% while avoiding the quarterly payment hassle seems like the perfect way to dip your toes in the water. I'm in a similar income bracket and was initially excited about the idea of earning interest on "my" tax money, but after seeing the real numbers people shared ($200-400 annually), it definitely puts things in perspective. Your approach of earning $200-250 with much less complexity seems like the sweet spot. I think I might follow your lead and start conservatively too. Maybe I'll even go with just a 50% reduction my first year to be extra safe. Thanks for sharing your plan - it's helpful to see someone else working through the same decision-making process!

This thread has been incredibly eye-opening for me too! I started reading with the same idea as the original poster - thinking I could just stop all withholding and earn interest on a big lump sum. But seeing everyone's real experiences and actual dollar amounts has completely changed my perspective. The discipline factor really can't be overstated. Multiple people mentioned how crucial it is to immediately set aside that money and never think of it as "yours." I can definitely see how easy it would be to rationalize dipping into those funds for something else, especially if they're just sitting in your regular account. I'm also impressed by how many people emphasized starting small and conservative. That seems to be the common thread among those who've actually succeeded with this strategy long-term. The folks earning $200-400 annually with reduced complexity sound much more sustainable than trying to optimize every last dollar. One thing I'm curious about that hasn't been mentioned much - has anyone tried this strategy during a year when their income changed significantly (job change, promotion, etc.)? I wonder how that affects the calculations and whether it makes the whole thing more complicated to manage. Thanks again to everyone for sharing such detailed experiences. This is exactly the kind of real-world insight you can't get from just reading IRS publications!