What deferring a tax payment means and when the IRS allows it

Deferring a tax payment means postponing the date you owe the money without paying it now. The IRS allows you to push back your payment deadline if you cannot pay by the original due date, but deferral is not the same as forgiveness — you still owe the full amount, plus interest and penalties that accrue while you wait.

The IRS offers two main paths to defer: a short-term extension (up to 120 days) that you can request without proving hardship, and a long-term payment plan (installment agreement) that spreads payments over months or years. Which one you use depends on how long you need and how much you owe.

Interest starts accruing immediately on unpaid taxes, currently at a rate set quarterly by the IRS (it varies). You also face a failure-to-pay penalty of 0.5% per month on the unpaid balance, unless you have a payment plan in place — in which case the penalty drops to 0.25% per month. The sooner you set up a deferral, the less penalty you accumulate.

Key Takeaways

  • A short-term extension gives you up to 120 extra days to pay without proving hardship, and you request it by calling the IRS or filing Form 4868 (for income tax) or Form 2688 (for other taxes).
  • A long-term installment agreement lets you pay in monthly chunks over several years, and the IRS charges a setup fee (usually $31 to $225 depending on how you set it up) plus interest and penalties on the unpaid balance.
  • Interest accrues from the original due date forward, so deferring does not stop the clock on what you owe — only on when you have to hand over the money.
  • You must request deferral before or on the original due date to avoid additional penalties; requesting after the deadline still works but costs you more.
  • If you owe less than $50,000, you can set up a payment plan online through IRS.gov without calling or mailing forms.

Short-term extension: how to get 120 extra days

A short-term extension postpones your payment deadline by up to 120 days. You do not have to prove hardship or explain why you need it — the IRS grants these routinely. The catch is that 120 days is the maximum; if you need longer, you move to a payment plan instead.

To request a short-term extension, you have three options. Call the IRS at 1-800-829-1040 and ask for a short-term extension; they will confirm it over the phone and send written notice by mail. File Form 4868 (Application for Automatic Extension of Time to File U.S. Individual Income Tax Return) if you have not filed your return yet, which also extends your payment deadline. Or use the IRS Online Payment Agreement tool at IRS.gov, which can set up a short-term extension if you owe under $50,000.

Once approved, you receive a new due date in writing. Mark it on your calendar — missing the extended deadline triggers the same penalties as missing the original one. Interest and penalties continue to accrue during the extension period, so the longer you wait, the more you owe.

Long-term payment plans: spreading payments over months or years

An installment agreement lets you pay your tax debt in monthly chunks instead of a lump sum. The IRS offers several types depending on how much you owe and how long you need.

For amounts under $50,000, you can set up a payment plan online at IRS.gov without calling or mailing anything. The setup fee is usually $31 if you pay by direct debit from your bank account, or $225 if you pay by check or credit card. The IRS will calculate a monthly payment amount based on your debt and how many months you want to spread it across — typically 24 to 72 months for smaller debts.

For amounts over $50,000, you must call the IRS at 1-800-829-1040 or mail Form 9465 (Installment Agreement Request) with your tax return. The setup fee is higher ($225 to $3,225 depending on the plan type), and the IRS may require you to prove your income and expenses before approving a long-term plan. These larger agreements can stretch across several years.

Once a payment plan is in place, your monthly payment becomes due on the same date each month. If you miss a payment, the IRS can cancel the agreement and demand the full remaining balance immediately. You can modify the plan later if your income changes, but that usually costs another setup fee.

Interest and penalties that keep growing while you defer

Interest on unpaid federal taxes is not optional — it accrues daily from the original due date until you pay in full. The rate changes quarterly and is currently set by the IRS based on the federal short-term interest rate plus 3%. As of early 2024, the rate sits around 8%, but check IRS.gov for the current quarter's rate since it changes.

The failure-to-pay penalty is a separate charge: 0.5% of your unpaid tax per month (or part of a month) if you do not have a payment plan, or 0.25% per month if you do. This penalty caps at 25% of your unpaid tax. So if you owe $10,000 and wait six months without a plan, you accumulate roughly $300 in penalties plus interest — money you would not owe if you had set up a deferral immediately.

Penalties and interest stack on top of each other. A $10,000 debt deferred for one year without a plan can grow to roughly $11,000 or more by the time you pay. With a payment plan in place, the same debt grows more slowly because the penalty rate drops in half.

How to request deferral before the deadline hits

The best time to request deferral is before your tax deadline passes. If you file your return on time but cannot pay, you can request an extension or payment plan up until the due date — usually April 15 for income tax. If you have not filed yet, Form 4868 gives you an automatic extension to file (usually October 15) and also extends your payment deadline.

If you miss the deadline and realize later that you owe, you can still request deferral, but penalties and interest will have already started piling up. The IRS does not forgive penalties for late requests, so you pay more the longer you wait. Request deferral as soon as you know you cannot pay on time.

You can request deferral online (for debts under $50,000), by phone, or by mail. Online is fastest — you get confirmation immediately and can set up automatic monthly payments from your bank account. By phone, you speak to an IRS representative who can answer questions but the process takes longer. By mail, you send Form 4868 or Form 9465 and wait for written approval, which can take several weeks.

What happens if you cannot stick to the payment plan

If you miss a payment on your installment agreement, the IRS sends a notice giving you 30 days to catch up. If you do not respond or pay within that window, the IRS can cancel the agreement and demand the full remaining balance immediately — not just the missed payment, but everything left on the debt.

If you fall behind, contact the IRS right away. You can request a modification to lower your monthly payment, pause payments temporarily (called a hardship suspension), or set up a new plan. These options exist, but you have to ask before the IRS cancels your agreement. Once cancelled, you are back to owing the full amount plus additional penalties.

If your financial situation changes and you can pay faster than planned, you can pay off the debt early without penalty. There is no fee for paying ahead of schedule, and you save on interest by reducing the time the debt sits unpaid.

Deferral versus other options: when deferral makes sense

Deferral is not the only path when you cannot pay taxes. Offer in Compromise lets you settle for less than you owe if you can prove you cannot pay the full amount. Currently Not Collectible status pauses collection efforts temporarily if you face severe hardship, though interest and penalties still accrue. Innocent Spouse Relief may remove liability if your spouse filed jointly and you did not know about unreported income.

Deferral makes sense when you can pay the full amount eventually but need time. It is the fastest option to set up and does not require proving hardship. If you genuinely cannot pay the full amount even over time, or if your situation is complex, you may need to explore other options — but deferral is where most people start.

Frequently Asked Questions

Can I defer state taxes the same way I defer federal taxes?

No. Each state has its own tax agency and its own deferral rules. Some states offer short-term extensions similar to the IRS; others require you to contact the state tax authority directly. Check your state's tax website or call the state revenue department to learn what options are available for state income tax or sales tax debt.

What if I owe back taxes from multiple years?

You can set up a single payment plan that covers all years at once. When you request deferral, tell the IRS which tax years you owe for, and they will calculate one monthly payment that covers the total debt across all years. Interest and penalties apply to each year separately, but you make one payment per month.

Do I have to pay the setup fee upfront?

No. The setup fee is usually added to your first payment or rolled into your monthly payment amount. If you set up a plan online, the fee is deducted from your first payment. If you set up by phone or mail, the IRS will tell you when the fee is due — typically with your first payment.

Can I defer if I owe penalties from a previous year?

Yes. Penalties from prior years are treated the same as the tax itself — they accrue interest and can be included in a payment plan. You cannot defer penalties separately, but you can defer the entire debt including penalties.

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

Call the IRS and request a modification. You can ask for a longer payment period (which lowers the monthly amount) or a temporary hardship suspension (which pauses payments for a set time). The IRS will not lower the total amount you owe, but they can stretch it across more months to make payments manageable.