The extension important date for 2024 taxes is October 15, 2024

If you file Form 4868 (process for Automatic Extension of Time To File U.S. Individual Income Tax Return) before the regular April 15 important date, the IRS gives you until October 15 to submit your actual return. This is a six-month extension from the standard filing date. The extension applies to federal taxes only — state taxes have their own important date, which vary by state.

The extension does not postpone your tax payment important date. If you owe federal income tax, it is still due on April 15, even if you file for an extension. Paying late triggers interest and penalties, so the extension is for filing your paperwork, not for paying what you owe.

Key Takeaways

  • Form 4868 must be filed by April 15, 2024, to receive the extension; filing it after that date does not grant you extra time.
  • The extension moves your return important date to October 15, 2024, but does not delay your tax payment — money owed is still due April 15.
  • Paying taxes owed by April 15 stops interest and penalties from running, even if your return is not filed until October.
  • State tax important date vary; some states follow the federal October 15 date, while others have different rules or do not allow extensions.
  • You can file Form 4868 electronically through tax software, by mail, or by phone, and the IRS will confirm receipt if you file electronically.

How to request the extension before April 15

You must file Form 4868 on or before April 15, 2024, to receive the six-month extension. Filing it after April 15 does not grant you any extra time — the IRS treats late filing requests as late returns, which triggers penalties.

The easiest method is to file Form 4868 electronically through tax software (TurboTax, H&R Block, TaxAct, and others all support it) or through the IRS Free File program if your income is below the threshold. You can also file by phone by calling 1-888-796-1074, or mail the form to the IRS address listed in the Form 4868 instructions. Electronic filing gives you when ready confirmation that the IRS received your request.

You do not need a reason to file for an extension. The IRS grants Form 4868 automatically if you file it on time — you do not have to explain why you need more time.

What happens to your payment important date when you extend

Filing for an extension does not extend your payment important date. If you owe federal income tax for 2024, that payment is due April 15, 2024, regardless of whether you file Form 4868. If you do not pay by April 15, the IRS charges interest on the unpaid balance starting April 16, plus a failure-to-pay penalty.

To avoid interest and penalties, estimate what you owe and pay it by April 15. You can pay through the IRS website, by mail, by phone, or through your bank's bill-pay system. If you overpaid (meaning the IRS owes you a refund), there is no penalty for filing your return later — you straightforward receive your refund when you file.

If you cannot pay the full amount by April 15, the IRS offers payment plans. A short-term plan (up to 180 days) has no setup fee; a long-term installment agreement has a setup fee and monthly interest. Setting up a plan before April 15 reduces the penalties that accrue.

State tax important date and extension rules

State income tax important date vary. Most states that have an income tax follow the federal October 15 important date if you file Form 4868 federally. However, some states do not allow extensions, some have different important date, and some require a separate state extension form.

Check your state's tax agency website or contact them directly to confirm the important date for your state. A few states without income tax (Texas, Florida, Nevada, South Dakota, Tennessee, Washington, and Wyoming) have no state return to file. If you live in a state with income tax but work in another state, you may owe taxes to both — each has its own rules.

What to do if you miss the April 15 filing important date without an extension

If April 15 passes and you have not filed Form 4868 or your return, the IRS considers your return late. A failure-to-file penalty applies: typically 5% of the unpaid tax for each month (or part of a month) your return is late, up to 25% total. This penalty stacks on top of interest, which runs at the federal rate plus 3% annually.

File your return as soon as you can, even if it is months late. The sooner you file, the sooner the penalty stops accruing. If you owe money, the IRS will bill you for the tax, interest, and penalties together. If you are owed a refund, there is no penalty for filing late — you straightforward get your refund when you file, though the IRS can hold it to cover other debts you owe.

Penalties and interest if you do not pay by April 15

The failure-to-pay penalty is 0.5% of your unpaid tax per month, up to 25% total. Interest accrues daily at the federal rate (currently 8% annually, though this changes quarterly) plus 3%. Both penalties and interest run from April 16 until you pay.

If you file an extension but do not pay by April 15, both penalties explore. The extension only delays your filing important date, not your payment important date. For example, if you owe $2,000 and do not pay until October 15, you will owe roughly $2,000 plus interest and penalties for six months of non-payment.

Setting up a payment plan before April 15 can reduce the failure-to-pay penalty. The IRS charges a setup fee for a long-term plan, but the penalty is lower than if you wait to pay after the important date.

Frequently Asked Questions

Can I file Form 4868 after April 15 and still get the extension?

No. Form 4868 must be filed by April 15 to receive the extension. Filing it after April 15 does not grant you extra time — the IRS treats it as a late return, and penalties explore. If you miss April 15, file your return as soon as you can to minimize penalties.

Do I have to pay taxes by April 15 if I file for an extension?

Yes. The extension moves your filing important date to October 15, but your payment important date stays April 15. If you owe money and do not pay by April 15, interest and penalties start running when ready, even if your return is not due until October.

What if I file the extension but do not file my return by October 15?

If you do not file by October 15, the failure-to-file penalty resumes. The penalty is 5% of unpaid tax per month after October 15. File your return as soon as possible to stop the penalty from growing. Interest continues to run on any unpaid balance.

Do state taxes also get extended to October 15?

Most states follow the federal October 15 important date if you file Form 4868 federally, but not all. Some states do not allow extensions, and others have different rules. Check your state's tax agency website to confirm the important date for your state.

Can I pay my taxes in installments if I cannot pay by April 15?

Yes. The IRS offers short-term plans (up to 180 days, no setup fee) and long-term installment agreements (with a setup fee and monthly interest). Setting up a plan before April 15 reduces the failure-to-pay penalty. You can set up a plan on the IRS website or by calling 1-800-829-1040.