The Learning Center | DiMercurio Advisors

How do penalties and interest on late taxes work?

Written by Nate Richards EA | Sep 24, 2025

IRS penalties exist to nudge everyone into filing and paying when they’re supposed to. It’s less about scolding mistakes and more about keeping the whole system on schedule. Interest, on the other hand, isn’t just some random punishment tacked onto your bill. The government relies on your tax dollars to keep things running, so they charge interest when they don’t get paid on time. 

Here’s the good news: once you understand how penalties and interest really work, you’re not at their mercy. You can take control, dodge the worst fees, and keep your business running smoothly. 

Contents

What happens if I miss a tax deadline? 
How much does the IRS charge for late filing or payment? 
Other Penalties 
What if I just can’t pay right now? 
Does the IRS ever forgive or reduce penalties? 
How do I keep IRS fees from getting out of hand? 

 

What happens if I miss a tax deadline? 

The IRS can mark you as late in two ways. First, you might file your return after the deadline. Second, you might pay your taxes after they are due. These are separate issues, and each one has its own penalties. 

Fines kick in immediately. The day after your payment or filing deadline passes, the IRS starts adding charges: 

  • Interest begins right away and keeps adding up daily. 
  • Penalties also begin immediately and will keep stacking up until you take action. 
  • Notices from the IRS may take time to arrive, but by then, the amounts you owe could be much bigger. 

How much does the IRS charge for late filing or payment? 

There are different penalties for late filings and late payments: 

  • Late Filing Penalty: The IRS charges 5% of the unpaid taxes for each month or part of a month that your return is late. This can go up to 25% of your unpaid taxes. If you have to choose between paying or filing, file first. It avoids the biggest fees. 
  • Late Payment Penalty: This penalty is smaller at first. It starts at 0.5% of your unpaid taxes for each month you wait. But it still can reach 25% if you do nothing. 

These penalties can stack up. However, if both penalties apply in the same month, the IRS lowers the late filing penalty a bit, so it is not fully doubled. On top of these penalties is the associated interest. 

The IRS adjusts its interest rates every few months. They typically remain around 7% to 8% in 2024, based on short-term federal rates plus 3%. What makes it worse is that interest compounds daily. This means your balance grows faster than you might expect. 

Other Penalties 

Handling payroll taxes comes with special deadlines. If you miss an employment tax deposit, the “failure to deposit” penalty can range from 2% up to 15%, depending on how late you are. Filing payroll returns like Form 941 also comes with penalties similar to the regular ones. Missing payroll deposits can lead to bigger charges quickly. 

Missing the deadline for a form like a 1099 or W-2 has its own penalty. This is not tied to tax amounts and is charged for each late form. The fees range from $60 to $310 per form. If the IRS decides you ignored the rules on purpose, the penalties can be much higher and have no cap. 

What if I just can’t pay right now? 

Some people think skipping their return is better than admitting they cannot pay. Unfortunately, not filing is the worst mistake. The failure-to-file penalty is much bigger than the penalty for paying late. It is also easier to get relief if you file. 

Here’s what to do if you can't pay it all today: 

  • Always file, even if you cannot pay everything. Filing lowers your biggest penalty. 
  • Pay as much as you can right away. This cuts down on how much interest and fees can grow. 
  • Set up a payment plan. The IRS is usually willing to work with you. Interest will still apply, but the Failure to Pay penalty will reduce from 0.5% to 0.25%. 
  • Move quickly. The sooner you act, the less damage you will face. 

Does the IRS ever forgive or reduce penalties? 

There are times when the IRS will remove or lower penalties. If you have a strong reason like a natural disaster or emergency, you can ask for relief. 

If you have filed and paid on time in the last three years, you might qualify for a one-time waiver of penalties, called a first-time penalty abatement. This does not remove interest, and you have to ask for it. 

With that said, the IRS does not forgive penalties in cases of fraud or clear, repeated refusal to pay. In these situations, penalties will be much higher. 

How do I keep IRS fees from getting out of hand? 

These fees are more than an inconvenience. They can snowball into big problems. The IRS may not inform you of the issue for 3 to 6 months (and even longer on a paper return). Even before you are informed, penalties and interest are accruing. A small slip can grow into a big debt for your business if you do not address it. 

Follow these practical steps to stay on top of your tax responsibilities: 

  1. Create an Online IRS Account. Find out more here. 
  2. Track all IRS deadlines and check them often. Use reminders and have someone on your team help watch for important dates. 
  3. File your return on time, even if you cannot pay everything 
  4. Pay what you can right away. Even a small payment cuts future fees. 
  5. Open and read every IRS letter. Ignoring these will only make things worse. 
  6. Set up a payment plan if you cannot pay in full 
  7. Keep up with IRS updates. Rules change, so stay informed. 
  8. Ask for help if you are unsure. A tax professional can help you avoid bigger problems. 

The Bottom Line 

Acting early and staying informed makes taxes less scary. Mark your calendar, get your paperwork together, and do not be afraid to ask questions. It could save you money and a lot of headaches. Want to stay ahead? Take a few minutes today to check your tax deadlines and systems. Your future self and your bottom line will thank you.