What Happens If You File Your 2025 Taxes Late in 2026?

Missed the April 15, 2026 deadline? You can still file your 2025 federal tax return. Your next steps depend on whether you filed an extension and whether you still owe tax.

If you owe, acting now can limit additional penalties and interest. If you expect a refund, filing sooner allows the IRS to process it and helps protect your right to claim it within the applicable refund period.

Missed the Deadline Without an Extension?

File as soon as you can.

You can still prepare and submit your 2025 return after the deadline. Electronic filing options remain available after April 15, although availability may vary by provider and return type. (IRS)

Even if you cannot pay in full, filing now can stop the failure-to-file penalty from continuing to grow. Pay as much as you can, then review payment options for the remaining balance.

You can prepare and file your own 2025 tax return or have a tax professional prepare it for you.

How Much Is the IRS Late-Filing Penalty?

The IRS may charge one penalty for filing late and another for paying late.

Failure-to-file penalty

The failure-to-file penalty applies when you do not submit your return by the filing deadline, including an extended deadline when one applies.

The standard penalty is:

• 5% of the unpaid tax for each month or part of a month the return is late
• Up to 25% of the unpaid tax

If a return required to be filed in 2026 is more than 60 days late, the minimum penalty is the lesser of $525 or 100% of the unpaid tax. (IRS)

Failure-to-pay penalty

The failure-to-pay penalty applies when tax is not paid by the original payment deadline.

The standard penalty is:

• 0.5% of the unpaid tax for each month or part of a month the balance remains unpaid
• Up to 25% of the unpaid tax (IRS)

What happens when both penalties apply?

The penalties are not simply added together as 5.5% per month.

When both apply during the same month, the failure-to-file penalty is typically reduced by the failure-to-pay penalty. The combined penalty is usually 5% for that month:

• 4.5% for failure to file
• 0.5% for failure to pay

Once the failure-to-file penalty reaches its limit, the failure-to-pay penalty may continue until the balance is paid or that penalty reaches its own maximum. (IRS)

How Fast Can Late Penalties Add Up?

Here is a simplified example for someone who owes tax, did not request an extension, and has neither filed nor paid.

After five months, the failure-to-file penalty has usually reached its standard maximum. The failure-to-pay penalty may continue to accrue separately until the balance is paid or that penalty reaches its own limit.

A taxpayer with $1,000 in unpaid tax who files three months late could face about $150 in combined penalties, before interest.

This example assumes both penalties apply and no payments have been made. The actual amount may differ based on the filing date, payment history, available credits, and whether the taxpayer qualifies for penalty relief.

Use the IRS penalty and interest calculator for a more tailored estimate.

Failure to File vs. Failure to Pay

Filing and paying are separate obligations. Filing can stop the failure-to-file penalty, but it does not stop failure-to-pay penalties or interest on an unpaid balance.

A partial payment can still help because future charges are based on the balance that remains unpaid.

For a deeper explanation, read Late Tax Filing Penalties: What You Need to Know.

What Is the Current IRS Interest Rate?

The IRS charges interest on unpaid federal tax from the original payment deadline until the balance is paid. Interest compounds daily, and the rate changes quarterly. (IRS)

Current individual underpayment rate: 7% annually from July 1 through September 30, 2026. (IRS)

Different quarterly rates may apply while a balance remains unpaid, so an estimate made today may not match the IRS’s final calculation.

Estimate your potential penalties and interest.

Filed an Extension? Here’s How to Finish Your 2025 Return

A timely federal extension gives most individual taxpayers until October 15, 2026 to file their 2025 return. (IRS)

You now need to complete and submit your regular 2025 return:

1. Gather any missing tax documents.
2. Finish and review the return.
3. File electronically while e-file is available.
4. Pay the remaining balance or review payment options.

Once your return is complete and accurate, filing it before October 15 reports the balance due or refund claimed to the IRS. It also leaves more time to correct a rejected return and reduces the risk of missing the extended deadline.

You can file your own extended return online or have a tax professional complete it for you.

For detailed extension rules and special circumstances, visit the FileTax Tax Extension Help Center.

What a Filing Extension Changes—and What It Does Not

An extension changes the filing deadline. It does not change the payment deadline. (IRS)

If you filed an extension but did not pay the expected balance by April 15, filing the return now will confirm what you owe. It will not, by itself, stop failure-to-pay penalties or interest. Those charges continue until the balance is paid.

Use the penalty and interest calculator to estimate what the unpaid balance may be costing you.

What If You Cannot Pay the Full Balance?

File anyway.

Holding back the return because you cannot pay can make the problem more expensive. Filing stops the failure-to-file penalty from continuing, and a partial payment reduces the balance used to calculate future penalties and interest.

IRS payment options may include:

• A short-term payment plan
• A monthly installment agreement

Penalties and interest usually continue while a balance remains unpaid. Review the available IRS payment plans if you need more time to pay.

What If You Are Owed a Refund?

There is generally no failure-to-file penalty when you are due a federal refund and have no unpaid tax. (IRS)

Delaying the return also delays your refund. You could lose the right to claim it if you wait beyond the applicable refund deadline.

Refund claims are generally subject to a three-year filing window, although different rules may apply depending on when the return was filed and when the tax was paid. (IRS)

How to File Your 2025 Taxes After the Deadline

You complete the same 2025 federal return you would have filed before April 15.

Gather your documents

Collect your W-2s, 1099s, deduction and credit information, dependent details, and records of estimated tax or extension payments.

Complete and review the return

Make sure all income, withholding, credits, payments, and extension amounts are included.

File electronically

Electronic filing usually provides quicker confirmation that the IRS accepted or rejected the return. Availability may depend on the filing provider and type of return.

Pay what you can

A partial payment reduces the unpaid balance used to calculate additional penalties and interest.

Address the remaining balance

Review available IRS payment plans rather than delaying the return because you cannot pay in full.

Ready to finish?

• Prepare and file your own 2025 tax return
• Have a tax professional prepare your 2025 return

Take the Next Step

You can still file your 2025 return after April 15, 2026.

If you owe tax, filing now can stop the failure-to-file penalty from growing. Paying what you can may also reduce future penalties and interest. If you are due a refund, filing sooner starts the refund process and helps protect your right to claim it.

• Prepare and file your own return
• Get professional tax preparation help