IRS Payment Plan (Installment Agreement) Calculator

An IRS installment agreement (IA) under IRC §6159 lets you pay back taxes monthly over time. Most individuals qualify for a simple payment plan: an assessed balance of $50,000 or less in tax, penalties and interest, paid in full by the collection statute expiration date. Apply online at IRS.gov/payments using the Online Payment Agreement tool, by phone at 1-800-829-1040, or via Form 9465. Setup fees range from $29 (online + direct debit) to $178 (phone/mail + manual payment). Low-income taxpayers (≤250% FPL) pay $43 with non-direct-debit methods, or $0 with direct debit.

The IRS interest rate is the federal short-term rate + 3 percentage points, set quarterly per IRC §6621. For Q4 2026 the rate is 7% annualized, compounded daily under §6622. The interest does NOT pause when you set up an IA — it continues to accrue until the balance is fully paid, and it is reset every quarter, so a multi-year payment plan can cross several different rates.

No — but it gets cut in half. Without an IA, the failure-to-pay penalty under IRC §6651(a)(2) is 0.5% per month (or fraction), capped at 25% of the unpaid tax. With an approved IA in effect (and your return filed on time), it drops to 0.25% per month — saving 3% annualized. After the IRS issues a final notice of intent to levy and 10 days pass unpaid, the penalty jumps to 1% per month, but a properly maintained IA prevents that.

A simple payment plan is the standard installment agreement for most individuals. The Form 9465 instructions say you are generally eligible if your assessed total balance of tax, penalties and interest is $50,000 or less and your proposed payment pays the tax liability in full by the collection statute expiration date (CSED), generally 10 years from the date the tax was assessed. A simple payment plan generally does not need a financial statement or a Notice of Federal Tax Lien. A plan that will not pay in full before the CSED is a partial payment plan, which requires a financial statement and is reviewed again later. The instructions state no separate direct debit or number-of-months condition for eligibility.

IRC §6159(c) requires the IRS to enter into an installment agreement for an individual's income tax when five conditions all hold: the tax owed (leaving out interest, penalties and additions) is $10,000 or less; in the preceding 5 tax years neither you (nor your spouse, on a joint liability) failed to file, failed to pay, or entered into an installment agreement; the IRS determines you cannot pay the liability in full when it is due, on the information you supply; the agreement pays it off within 3 years; and you agree to comply with the tax code while it runs. If one is missing the IRS may still grant an agreement, but it is not required to.

A short-term plan gives you up to 180 days to pay in full, works for balances of less than $100,000, and has no setup fee — but interest and the 0.5%/month failure-to-pay penalty still accrue. A long-term plan (installment agreement) spreads payments over many months (in full by the collection statute expiration date), charges a one-time setup fee ($29–$178), but cuts the failure-to-pay penalty to 0.25%/month. If you can pay within 180 days, the short-term plan is strictly cheaper.

Compare effective annualized cost. The IRS IA combined cost (interest + penalty) is roughly 7% + 3% ≈ 10% per year at the current rate. A 0% APR balance-transfer credit card with a 3-5% transfer fee is cheaper if you can pay off within the promo window. A personal loan at 8-12% APR is usually similar. The IRS IA has no impact on your credit report (federal tax liens were removed from credit bureau reports in 2018).

One missed payment puts the IA in default risk. The IRS sends a CP523 notice (intent to terminate). You typically have 30 days to cure the missed payment. If you don't, the IA terminates, the FTP penalty jumps from 0.25%/mo back to 0.5%/mo (1%/mo after a final levy notice), and IRS collection actions resume. Direct debit IAs are far less likely to default — the payment is automatic from your bank.