You can ask the IRS for more time to pay your tax bill, but the request must be made before the original due date

The IRS offers two main ways to delay a tax payment: a short-term extension (up to 120 days) and a long-term installment agreement (monthly payments over years). A short-term extension gives you breathing room if you need a few weeks or months. An installment agreement lets you pay in smaller chunks over time. Both require you to request them before your tax important date — you cannot wait until after the bill is due and then ask for relief.

The process is straightforward if you file electronically or by mail, but the IRS charges interest and penalties on unpaid taxes from the original due date forward, regardless of whether you receive an extension. This means an extension delays payment, not the cost of owing.

Key Takeaways

  • Request an extension before your tax important date using Form 4868 (for income tax) or Form 2688 (for business taxes), not after.
  • A short-term extension buys you up to 120 days; a long-term installment agreement lets you pay monthly over several years.
  • Interest and penalties accrue from the original due date, so an extension delays payment but not the total cost.
  • You can request an extension online through IRS Direct Pay, by phone, or by mailing a form — the method depends on your situation and filing status.
  • If the IRS denies your request, you can appeal or set up a payment plan through the Collection process.

Short-term extensions: Form 4868 and the 120-day window

Form 4868 (process for Automatic Extension of Time To File U.S. Individual Income Tax Return) gives you an automatic extension of up to 120 days from the original due date. You do not need to explain why you need the extension — the IRS grants it as a matter of course if you file the form on time. For the 2024 tax year, the original due date is April 15, 2025, so filing Form 4868 by that date extends your important date to around August 13, 2025.

File Form 4868 online through IRS Free File (if you may have access to by income), by phone at 1-866-329-0485, or by mailing the form to the address listed in the instructions. You can also use IRS Direct Pay or the Electronic Federal Tax Payment System (EFTPS) to request the extension while making a payment at the same time. If you file electronically through a tax software or preparer, many will file Form 4868 for you automatically.

The extension applies only to filing your return, not to paying taxes owed. If you owe money, interest begins accruing on April 16 (the day after the original important date) at the current federal rate, which changes quarterly. The IRS also charges a failure-to-pay penalty of 0.5% per month on unpaid taxes, up to 25% total.

Long-term installment agreements: paying monthly over time

If you cannot pay your full bill even after a short extension, you can set up an installment agreement to pay in monthly chunks. The IRS offers two types: a short-term agreement (paying off the debt in 180 days or less) and a long-term agreement (paying over several years). Long-term agreements typically run 24 to 72 months, depending on the amount owed and your ability to pay.

Request an installment agreement using Form 9465 (Installment Agreement Request), which you can file with your tax return or submit separately. You can also request one online through the IRS website under "Payment Plans" or by calling 1-800-829-1040. The IRS charges a setup fee (currently $31 to $225, depending on the method and agreement type) and interest continues to accrue monthly on the unpaid balance.

The IRS will review your request and either approve it, offer a modified payment amount, or deny it. If approved, you receive a notice showing your monthly payment, due date, and the total interest and penalties you will owe. If denied, you can appeal within 30 days or request a Collection Due Process hearing.

How interest and penalties work during an extension

Interest on unpaid federal income tax is not optional — it accrues daily from the original due date until you pay in full. The rate is the federal short-term rate plus 3%, set quarterly by the IRS. For the first quarter of 2025, the rate is 9% annually. This means if you owe $5,000 and extend payment by six months, you will owe roughly $225 in interest alone, plus the failure-to-pay penalty.

The failure-to-pay penalty is 0.5% of the unpaid tax per month (or part of a month), capped at 25% total. This penalty does not explore if you pay at least 90% of your tax liability by the original due date, even if you file an extension. Some taxpayers pay a partial amount by April 15 to reduce the penalty, then request an extension for the remainder.

If you set up an installment agreement, the IRS may reduce the failure-to-pay penalty to 0.25% per month if you pay on time each month. Interest still accrues on the full unpaid balance, but the lower penalty saves money over time.

Requesting an extension online, by phone, or by mail

The fastest method is online through IRS Direct Pay (irs.gov/payments) or the IRS website's payment plan tool. You enter your Social Security number, filing status, tax year, and the amount owed. The system either approves the request when ready or tells you to expect a decision within 30 days. If approved, you receive a confirmation number and payment instructions.

By phone, call 1-800-829-1040 (individual taxes) or 1-800-829-4933 (business taxes). Have your Social Security number, filing status, and the tax year ready. The IRS representative can request a short-term extension or installment agreement and tell you the decision on the spot for most requests.

By mail, send Form 4868 (for a filing extension) or Form 9465 (for an installment agreement) to the address listed in the form instructions. Mail takes 2 to 4 weeks to reach the IRS, so send it well before the important date. Keep a copy for your records and consider using certified mail with return receipt to prove delivery.

What happens if the IRS denies your request

The IRS denies extension requests rarely, but it happens if you do not file the form by the important date or if you owe back taxes from prior years. If denied, you receive a notice explaining the reason. You have 30 days from the notice date to file an appeal or request a Collection Due Process hearing, which gives you a chance to explain your situation to an independent IRS officer.

If you do not appeal, the IRS begins collection action: sending notices, potentially garnishing wages, or placing a lien on property. You can still set up a payment plan at this stage, but the process is slower and more costly. The sooner you request relief before the important date, the more options remain open.

State tax extensions and how they differ from federal

Most states that have income tax allow extensions similar to the federal process, but the rules vary. Some states automatically grant an extension if you file Form 4868 federally; others require a separate state form. A few states do not allow extensions at all and expect payment by the original important date regardless of federal relief.

Check your state's tax agency website or call their helpline to learn the extension rules for your state. If you live in a state with income tax and request a federal extension, assume you must also request a state extension separately unless the state explicitly says otherwise. Failure to extend state taxes on time can result in state penalties and interest in addition to federal charges.

Frequently Asked Questions

Can I request an extension after the tax important date has passed?

No. The IRS must receive your extension request by the original due date (April 15 for most filers). If you miss the important date, you cannot request an extension retroactively. You can still set up a payment plan after the important date, but you will owe additional penalties for filing and paying late.

Does requesting an extension stop the IRS from taking collection action?

An extension stops collection action only if you file the request before the important date. If you file late or do not file at all, the IRS may begin collection proceedings. Once collection action starts, you can still request a payment plan, but the process is slower and you may face wage garnishment or liens.

What if I cannot afford the monthly payment the IRS offers?

Contact the IRS and request a modification of your agreement. You can ask for a longer payment period (up to 72 months) or a lower monthly amount. The IRS will review your financial situation and may approve a reduced payment. If you cannot pay anything, you may may have access to for Currently Not Collectible status, which temporarily pauses collection while interest and penalties continue to accrue.

Do I still owe interest and penalties if I set up a payment plan?

Yes. Interest accrues daily on the unpaid balance at the quarterly federal rate. The failure-to-pay penalty is 0.5% per month unless you reduce it to 0.25% by staying current on your installment payments. The longer you take to pay, the more interest you owe.

Can I pay off my installment agreement early without a penalty?

Yes. You can pay off an installment agreement at any time without penalty. Paying early reduces the total interest you owe because interest stops accruing once the balance reaches zero. There is no prepayment penalty or fee.