April 15 has come and gone. If you filed your return on time — congratulations, you’re done for now. But if you missed the deadline, or if you filed an extension and aren’t sure what happens next, this guide walks you through everything you need to know — step by step, no panic required.
Whether you owe money, are expecting a refund, or simply ran out of time, there are clear paths forward. The worst thing you can do is nothing. The best thing you can do is take action today.
If You Filed a Tax Extension — What Happens Now?
Filing an extension was a smart move. By submitting Form 4868 before April 15, you gave yourself until October 15, 2026 to file your completed tax return. But there are a few things you need to understand about what an extension does — and what it doesn’t do.
What Your Extension Covers
- You have until October 15, 2026 to file your federal tax return
- The IRS will not charge you a late filing penalty as long as you file by that date
- Most states that require income tax returns automatically extend your state deadline when you file a federal extension — but not all. New York State, for example, requires a separate extension (Form IT-370)
- Your extension is automatically approved — the IRS accepts most extension requests without review
What Your Extension Does NOT Cover
- An extension does NOT give you more time to pay. Any taxes you owed were still due on April 15
- If you didn’t pay your estimated balance by April 15, interest is already accruing — starting April 16
- The late payment penalty is 0.5% of unpaid taxes per month (up to 25% maximum)
- Interest compounds daily at the IRS quarterly rate (currently around 7-8% annually)
Your Action Plan If You Filed an Extension
- Confirm your extension was accepted — If you e-filed, you should have received a confirmation. If you mailed Form 4868, the IRS won’t send confirmation but will notify you if it was denied (rare).
- Pay any remaining balance now — If you estimated your taxes but underpaid, send the difference as soon as possible. Every day you wait adds interest. Pay at IRS.gov/payments.
- Gather your remaining documents — You filed the extension because something was missing. Now is the time to track down those K-1s, 1099s, brokerage statements, or rental income records.
- Don’t wait until October — File as soon as your documents are ready. There’s no advantage to waiting. The sooner you file, the sooner you stop any payment penalties and get your refund (if one is owed).
- Work with a tax professional — If you filed the extension because your situation is complex (self-employment, rental properties, multi-state income, ITIN filing), now is the perfect time to get professional help while there’s no deadline pressure.
If You Missed the Deadline and Did NOT File an Extension
First — take a breath. You’re not the first person to miss the deadline, and the IRS has options for you. But you need to act quickly, because penalties and interest are accumulating every day.
What the IRS Charges for Late Filing
The penalties depend on whether you owe taxes or are getting a refund:
If you OWE taxes and didn’t file:
- Late filing penalty: 5% of unpaid taxes per month (or partial month), up to 25%
- Late payment penalty: 0.5% of unpaid taxes per month, up to 25%
- If your return is more than 60 days late, the minimum penalty is $525 or 100% of unpaid tax — whichever is smaller
- Interest compounds daily on top of penalties
- Combined, you could be looking at 5.5% per month in penalties alone, plus interest
If you are OWED a refund:
- There is NO penalty for filing late if the IRS owes you money
- However, you must file within 3 years to claim your refund (by April 15, 2029 for tax year 2025)
- You won’t earn interest on your refund — the IRS keeps that
- Even if you don’t think you owe, file anyway. You may be leaving money on the table from refundable credits like the Earned Income Tax Credit or Child Tax Credit
Your Action Plan If You Missed the Deadline
- File immediately — Even if it’s late, filing now stops the late filing penalty from growing. The 5% monthly penalty is the most expensive one.
- Pay what you can — You don’t have to pay the full amount to file. Pay as much as you can right now. The IRS charges penalties based on the unpaid balance, so every dollar you pay reduces future penalties.
- Set up a payment plan — If you can’t pay in full, the IRS offers installment agreements. If you owe $50,000 or less, you can apply online at IRS.gov. Options include short-term plans (pay within 180 days) and long-term monthly payment plans.
- Request penalty relief — If this is your first time filing late and you’ve been compliant for the past 3 years, you may qualify for First Time Penalty Abatement. The IRS can waive the late filing and late payment penalties entirely. Ask your tax professional about this.
- Don’t ignore IRS notices — If you receive a letter from the IRS this summer about unpaid taxes, respond promptly. Ignoring it makes everything worse.
Key Dates to Remember After April 15
- June 16, 2026 — Q2 estimated tax payment due (for self-employed and quarterly filers)
- September 15, 2026 — Q3 estimated tax payment due
- October 15, 2026 — Extended filing deadline. This is the absolute last day to file if you received an extension.
- January 15, 2027 — Q4 estimated tax payment due for tax year 2026
If you are self-employed or have income that doesn’t have taxes withheld (rental income, 1099 work, investment gains), stay on top of these quarterly dates. Missing them triggers a separate underpayment penalty.
IRS Payment Options — How to Pay What You Owe
The IRS makes it easy to pay online. Here are your options:
- IRS Direct Pay (irs.gov/directpay) — Free bank transfer, immediate confirmation
- EFTPS (Electronic Federal Tax Payment System) — For individuals and businesses, schedule payments in advance
- Debit or credit card — Through approved processors (small fee applies)
- IRS Online Payment Agreement — Set up an installment plan if you can’t pay in full
- Check or money order — Mail to the IRS with a payment voucher (Form 1040-V)
When to Call a Tax Professional
You should absolutely get professional help if any of these apply to you:
- You filed an extension but have a complex return (self-employment, rental property, multi-state, ITIN)
- You missed the deadline and owe a significant amount
- You received an IRS notice or letter
- You haven’t filed taxes for multiple years
- You need help setting up a payment plan or requesting penalty abatement
- You’re not sure whether you owe or are getting a refund
At Dynamic Tax & Accounting, we handle post-deadline filings, extension returns, and IRS correspondence every day. Whether you come to one of our four offices in the Bronx, Queens, Buffalo, or Totowa NJ — or work with us virtually from anywhere in the country through the Dynamic Tax App — we’ll get your taxes filed correctly and minimize your penalties.
Call us at (646) 295-3811 or download the Dynamic Tax App to get started.
Frequently Asked Questions
Is there a penalty for filing after April 15 if I’m getting a refund?
No. The IRS does not charge penalties or interest if they owe you money. However, you must file within 3 years to claim your refund. After that, the money goes to the U.S. Treasury permanently.
I filed an extension but didn’t pay — what happens?
Interest and the late payment penalty (0.5% per month) are already accruing on any unpaid balance since April 16. Pay as much as you can now to reduce the amount. Your extension protects you from the more expensive late filing penalty (5% per month), but not from late payment charges.
Can I still file an extension after April 15?
No. The deadline to file an extension was April 15. If you didn’t file an extension or a return by that date and you owe taxes, file your return as soon as possible to limit penalties.
How do I check if my extension was accepted?
If you e-filed, check for a confirmation email from your tax software or the IRS. If you mailed Form 4868, the IRS won’t send a confirmation but will notify you if it was denied. You can also check your IRS account at irs.gov/account.
What is First Time Penalty Abatement?
If you’ve filed on time and paid your taxes for the past 3 years, the IRS may waive your late filing and late payment penalties for the current year. You or your tax professional can request this by calling the IRS or including it with your filing.
