If your refund arrived smaller than the return promised — or never arrived at all — the likeliest explanation is an offset: your overpayment was applied to a debt before the money reached you. Two different systems do this, and confusing them wastes weeks, because each one sends you to a different place to argue. This page separates them, walks through the notices each one sends, covers what happens inside a payment plan, and ends with the one hardship remedy that exists — which has a deadline most people learn about too late.
General information, not tax or legal advice. Offset rules and contacts are from IRS and Bureau of the Fiscal Service published guidance as of October 2026; the notice you received identifies which system took your refund.
The IRS itself applies your overpayment to your other federal tax liabilities first, under §6402(a). If the offset paid a federal tax debt, your notice is CP49, and the IRS is who you deal with.
The Bureau of the Fiscal Service (BFS) — the Treasury office that actually issues IRS refunds — runs the Treasury Offset Program (TOP). Through TOP, your refund can be taken for past-due child and spousal support, federal agency nontax debts (such as a delinquent student loan), state income tax obligations, and certain state unemployment compensation debts.
| IRS offset | BFS / Treasury Offset Program | |
|---|---|---|
| Debts paid | Federal tax liabilities | Child/spousal support, federal nontax debts, state income tax, some state unemployment debts |
| Notice | CP49 (from the IRS) | BFS offset notice |
| Dispute with | The IRS | The agency that received the payment |
BFS notifies you in advance that an offset may occur, and after one happens its notice shows the original refund amount, the offset amount, the agency that received the payment, and that agency’s contact information. Read that agency line carefully: the IRS does not hold the offset details, and disputes go to the agency that received the money — the state, the support agency, the loan holder. Contact the IRS only if the offset paid a federal tax debt, or if the refund amount on the BFS notice differs from the amount on your return. BFS’s offset line is 800-304-3107 (TTY/TDD 800-877-8339), Monday–Friday, 7:30 a.m.–5 p.m. Central time.
A refund can also shrink because the IRS adjusted the return — a math error corrected, a credit disallowed. That is not an offset: no agency received your money, the IRS simply recomputed the return, and the dispute route runs through the IRS and its explanation notice. Keep the two separate; TOP cannot help you with an adjustment, and the IRS cannot unwind another agency’s offset.
Expect the offset anyway. IRS guidance is explicit: one condition of an installment agreement is that the IRS will automatically apply any refund due to you against the taxes you owe — and the refund is not applied toward your regular monthly payment, so keep making your scheduled payments while the plan runs. Only an excess — a refund larger than your total balance on all outstanding liabilities, after any other offsets — comes back to you. Two adjacent situations have their own rules and their own pages: offsets continue while a balance sits in currently not collectible status, and refunds in the years covered by an accepted offer in compromise are applied under the offer’s terms. Neither is re-explained here; both are linked because the rules genuinely differ.
There is one escape valve, and it is built into the statute: §6402(a) says the IRS “may” apply an overpayment to a tax liability, which makes the offset discretionary. Under the IRS’s internal guidance (IRM 13.1.24; IRM 21.4.6), where paying the tax debt first would leave you unable to meet reasonable basic living expenses — the economic-hardship standard — the IRS, usually working through the Taxpayer Advocate Service, can issue an Offset Bypass Refund: a manual refund paid to you without first satisfying the federal tax liability. Requests are to be worked immediately on receipt.
Both limits of the bypass matter more than the bypass itself:
The route in is the Taxpayer Advocate Service via Form 911 — the walkthrough, including TAS’s hardship criteria, is in the delay guide. If a filing season is approaching and an offset would break your budget, that conversation has to happen before you file, not after the refund disappears.
One deadline frames all of it: an offset counts as a payment of the debt, and a refund claim generally must be filed within the later of 3 years from when the return was filed or 2 years from when the tax was paid. If any part of an offset looks wrong, that window is already running.
Your joint return shows a $2,400 refund. You also owe $900 in back federal taxes, and your spouse has a $1,100 past-due child support obligation.
How do I know if my refund was offset? You are told: BFS sends a notice showing the original refund, the amount offset, and the agency that received it; for a federal tax debt, the IRS sends notice CP49. Where’s My Refund will also show a refund smaller than the amount on your return. If the paperwork is unclear, call BFS at 800-304-3107 for TOP offsets, or the IRS if a federal tax debt was paid.
Can the IRS take my refund if I’m on a payment plan? Yes — the IRS states it plainly: applying your refunds to the balance is a condition of the installment agreement, and it happens automatically even while you are current on the plan. The applied refund does not replace your monthly payment, so continue paying on schedule; skipping a payment because a refund was applied is a fast route to defaulting the agreement.
General information, not tax or legal advice. Sources: IRS, “Topic No. 203, Reduced Refund,” refund inquiries FAQ, and “Refunds” (irs.gov); Bureau of the Fiscal Service, Treasury Offset Program (fiscal.treasury.gov); IRM 13.1.24 and IRM 21.4.6 (Offset Bypass Refund); 26 U.S.C. §6402(a). Currency verified 2026-10-23.