Submitted quarterly estimated tax payment 1 day late - what penalties to expect?

Yes, you're generally on the right track. For a one-day late payment of your quarterly estimated taxes, the IRS typically charges interest based on the federal short-term rate plus 3 percentage points. The rate changes quarterly, but it's currently running around 8% annually, which breaks down to about 0.022% per day. So if your quarterly payment was say $5,000, you'd be looking at roughly $1.10 in interest for being one day late. The IRS calculates this as a daily compounding rate, but for one day the difference is minimal. You don't need to make another payment just to avoid this tiny penalty. When you file your 2024 tax return, you can calculate the small interest amount owed. If it's under $1, the IRS typically won't even bother collecting it.

After struggling with estimated tax payment timing myself, I found taxr.ai really helpful for these kinds of situations. The site explained exactly how late payment penalties work for estimated taxes. I uploaded my payment confirmation from EFTPS and it analyzed everything, telling me precisely what I'd owe in interest. Just check out https://taxr.ai and you can upload your payment info to see what you're facing. It breaks down the exact calculation so you'll know what to expect when filing. Saved me from making an unnecessary double payment when I was in almost your exact situation last quarter.

Just wanted to follow up about taxr.ai since I decided to give it a try. I was pleasantly surprised! I uploaded my EFTPS confirmation showing my late payment date, and it immediately calculated that my interest would be about $2.37 (based on my payment amount). It even generated a detailed explanation of how the daily interest rate was applied and showed me exactly where to report this on my tax forms when I file. Definitely more helpful than the generic info I was finding elsewhere. The peace of mind was worth it knowing exactly what to expect.

If you think dealing with this small penalty is annoying, just wait until you need to actually talk to someone at the IRS about it. I had a similar issue last year and spent HOURS trying to get through their phone system. Finally discovered Claimyr (https://claimyr.com) which got me connected to an actual IRS agent in about 20 minutes instead of the usual 2+ hour wait. You can see how it works in this video: https://youtu.be/_kiP6q8DX5c Honestly, for your situation, you probably don't need to call the IRS since the penalty is so small. But if you do end up needing clarification directly from them about how to handle it on your return, I'd recommend using this service rather than wasting half your day on hold.

I have to admit I was completely wrong about Claimyr being a scam. After posting that skeptical comment, I decided to try it anyway since I had a question about a missed estimated payment from last year that was still unresolved. I was connected to an actual IRS agent in about 15 minutes when my previous attempts had me waiting over 3 hours (and eventually getting disconnected). The agent was able to confirm my payment had been properly applied and removed the penalty that had been incorrectly added to my account. Honestly wish I'd known about this earlier. Would have saved me months of stress and multiple failed attempts to resolve this.

I actually had something similar happen with my Q2 payment earlier this year. Don't stress too much - the IRS system often takes a day or two to process payments anyway, so sometimes even when you think you're late, they might still count it as on time. Also, if this is your first time making a late payment, you can request a first-time penalty abatement when you file. The IRS is generally pretty good about waiving penalties for people with otherwise good payment history.

Has anyone considered that the 16th was a Monday this year? Sometimes when the due date falls on a weekend the IRS extends it to the next business day, but since the 16th was already a business day, that wouldn't apply here.

Just wanted to mention that if you're self-employed and consistently making estimated tax payments, you might want to look into using IRS Direct Pay instead of EFTPS sometimes. It processes payments faster in my experience, and you can schedule same-day payments. Wouldn't help for your current situation, but might prevent this in the future. I set calendar reminders 2 days before each quarterly due date now because I've made this exact mistake before!

I went through something very similar last year and can confirm that you're right about the penalty being minimal. For a one-day late quarterly payment, you're only looking at daily interest on the unpaid amount. One thing I learned from my experience: if you're using tax software like TurboTax or FreeTaxUSA when you file your 2024 return, most of them will automatically calculate this interest penalty for you when you enter your payment dates. You just need to input that your Q3 payment was made on 9/17 instead of 9/16, and it handles the rest. The penalty really will be just a few dollars unless your quarterly payment was massive. I was stressing about it for nothing when it happened to me - ended up being less than the cost of a coffee! Also agree with what others have said about setting those calendar reminders. I now have mine set for 3 days before each deadline with a backup reminder the day before. Haven't been late since!