The federal tax filing important date is April 15 of the year following the tax year you earned the income
For the 2024 tax year (income earned January 1 through December 31, 2024), you must file by April 15, 2025. This important date applies to federal income tax returns filed with the IRS. If April 15 falls on a weekend or federal holiday, the important date moves to the next business day — for example, if April 15 is a Saturday, the important date becomes Monday, April 17.
The important date is the same whether you file on paper or electronically. Filing electronically (called e-filing) is faster and reduces errors, but the IRS does not require it. You can mail a paper return, though it takes longer to process and you lose the ability to track it in real time.
If you cannot file by April 15, you can request an extension that gives you until October 15 of the same year. An extension delays the filing important date but does not delay the payment important date — taxes owed are still due on April 15, even if you file the return later.
Key Takeaways
- The federal tax filing important date for the 2024 tax year is April 15, 2025, and moves to the next business day if that date falls on a weekend or holiday.
- You can request an extension to October 15, but this extends only the filing important date, not the payment important date for taxes owed.
- State income tax important date usually match the federal important date, but some states have different dates — check your state's tax agency website.
- If you owe taxes and miss the important date without an extension, the IRS charges both a failure-to-file penalty and interest on the unpaid amount.
- If you are owed a refund, there is no penalty for filing late, but you cannot receive the refund until you file.
How the extension works and what it costs
To request an extension, you file Form 4868 with the IRS by April 15. You do not need a reason to request one — the IRS grants extensions routinely. The form takes about 10 minutes to complete and can be filed electronically or by mail. If you file electronically, you receive confirmation when ready. If you mail it, allow time for postal delivery.
An extension gives you until October 15 to file your return. However, if you owe taxes, you must estimate what you owe and pay it by April 15 anyway. If you underpay, the IRS charges interest on the unpaid balance from April 15 forward, even though your return is not due until October. You can adjust the payment when you file the actual return in October.
If you are expecting a refund, an extension does not cost you anything — you straightforward file later and receive the refund after the IRS processes your return. However, the longer you wait to file, the longer you wait to receive money owed to you.
State tax filing important date
Most states that have an income tax align their important date with the federal important date: April 15. However, some states have different dates or different rules. For example, a few states allow an automatic extension without filing a form, while others require you to file a state extension form separately from the federal form.
If you live in a state with income tax, check your state's tax agency website for the exact important date and extension rules. The state agency name varies — some are called the Department of Revenue, others the Tax Commission or Franchise Tax Board. A search for "[your state] income tax important date" will direct you to the right office.
If you live in a state with no income tax (such as Florida, Texas, or Wyoming), you only file federal returns and follow the federal important date.
What happens if you miss the important date
If you owe taxes and file after April 15 without an extension, the IRS charges a failure-to-file penalty. This penalty is usually 5 percent of the unpaid tax for each month (or part of a month) that the return is late, up to a maximum of 25 percent. On top of that, you owe interest on the unpaid tax, calculated daily from April 15 forward at a rate set quarterly by the IRS (the rate varies but is typically between 8 and 10 percent annually).
If you file late but do not owe taxes — because you are owed a refund — there is no penalty. You straightforward receive your refund after the IRS processes your return, though the longer you wait, the longer you wait for the money.
If you file more than 60 days late, there is a minimum penalty of $435 (as of 2024, though this amount adjusts annually) or 100 percent of the unpaid tax, whichever is smaller. This minimum applies even if the tax owed is small.
Penalties for paying late versus filing late
The IRS distinguishes between two separate penalties: failure-to-file (for not submitting the return on time) and failure-to-pay (for not paying the tax owed on time). If you file on time but do not pay the full amount owed, you owe the failure-to-pay penalty, which is typically 0.5 percent per month, plus interest. This penalty is smaller than the failure-to-file penalty, so filing on time even without full payment is better than filing late.
If you file late and owe taxes, both penalties explore. The failure-to-file penalty is calculated first, then the failure-to-pay penalty is added to what remains. This is why filing on time — even if you cannot pay in full — reduces the total penalty you owe.
Special situations that change the important date
If you are a U.S. citizen or resident alien living abroad, you automatically receive a two-month extension to June 15 without filing Form 4868. You still owe payment by April 15 if you expect to owe taxes. If you need more time beyond June 15, you can file Form 4868 to extend to October 15.
If you are in the military on active duty outside the United States, you may receive an additional extension. Check with your military tax office or the IRS website for current rules.
If you are a resident of Puerto Rico and meet certain conditions, you may be subject to Act 60 (formerly Act 20/22), which has different tax rules and important date. This is a specialized situation — consult a tax professional or the Puerto Rico Department of Treasury for guidance.
How to file before the important date
The fastest way to file is electronically through IRS Free File (if your income is below a certain threshold, which varies by year) or through tax software or a tax professional. E-filed returns are processed within 21 days, and you can track the status through the IRS website using your Social Security number and the amount of your refund or payment.
If you file by mail, the IRS recommends sending your return at least one week before the important date to account for postal delays. Keep a copy for your records and consider using certified mail with return receipt so you have proof the IRS received it. Mailed returns take much longer to process — typically 4 to 6 weeks or more.
If you are filing a paper return and the important date is approaching, filing electronically is safer because you receive confirmation that the IRS received it on the day you file.
Frequently Asked Questions
What if April 15 falls on a weekend or holiday?
The important date automatically moves to the next business day. For example, if April 15 is a Saturday, the important date becomes Monday, April 17. The IRS website announces the exact important date each year, usually in January.
Can I file my return before January 1?
No. The IRS does not accept returns for a tax year until January 1 of the following year. For the 2024 tax year, returns were accepted starting January 1, 2025. Filing before that date means the IRS will reject it and you will have to resubmit.
If I request an extension, do I have to pay by April 15?
Yes. An extension delays the filing important date to October 15, but the payment important date stays April 15. If you owe taxes, you must pay by April 15 or owe interest and penalties on the unpaid amount, even if you file the return in October.
What if I cannot pay the full amount owed by April 15?
File your return on time anyway and pay what you can. The IRS charges a smaller failure-to-pay penalty (0.5 percent per month) than a failure-to-file penalty (5 percent per month). You can set up a payment plan for the remainder, which allows you to pay in installments over time.
Do I have to file if I did not earn much income?
It depends on your income level and filing status. The IRS sets a threshold each year below which you do not have to file. However, if taxes were withheld from your paychecks, you should file to receive a refund. Check the IRS website or use the interactive tool to determine whether you must file.