Benefit overpayment: why you owe CCB, CGEB or GIS money back and how it is collected

What is a benefit overpayment?

A benefit overpayment happens when a recalculation shows you were paid more than your entitlement, so the difference becomes a debt. The CRA says that when a recalculation shows an overpayment, it sends a notice with a remittance voucher showing the amount owing (CRA, balance owing: benefits overpayment).

An overpayment is not a penalty. It is the benefit being brought back in line with the income, family and residence facts that should have applied. Knowing which agency paid the money tells you who sends the notice, how it is collected and how to challenge it.

Why do I owe benefits back?

Most overpayments come from a change that reached the agency after payments were already made. The CRA lists recalculations caused by changes in adjusted family net income, marital status, or the number of eligible children, and by reassessments of a tax return that affect benefit amounts (CRA, T4114 Canada Child Benefit).

• CCB overpayment: a child moved out, custody changed, a partner moved in, or a reassessment raised your family income.
• GST credit overpayment (now CGEB): your marital status changed, or a reassessment raised income for the base year. The CGEB replaced the GST/HST credit in July 2026 with the same rules.
• GIS overpayment: your income was higher than the figure used, you were outside Canada for more than 6 months, or a spouse's death or separation was reported late.
• Provincial credits paid with federal benefits: the Ontario Trillium Benefit and provincial child benefits are recalculated from the same return, so one change can create several small overpayments.

Worked example: two singles who became common-law

Two adults with no children each receive the single CGEB maximum of $679 for July 2026 to June 2027, for $1,358 in total. If they start living common-law, the couple's combined maximum becomes $890. Once the CRA is told, the difference for the months already paid can become an overpayment, up to $468 over a full year at the maximum rates. Actual amounts depend on income; this illustration uses the published maximums (CRA, CGEB how much).

Telling the CRA promptly keeps the overpayment small. Our guide to reporting a marital status change explains the timing, and the CGEB overview covers the couple rules.

How is a CCB or GST credit overpayment collected?

The CRA recovers most benefit overpayments by offsetting them against money it would otherwise pay you. For a CCB overpayment, it may keep all or part of future CCB payments, income tax refunds and CGEB payments. For a CGEB overpayment, it keeps future CGEB payments or income tax refunds. The same can apply to provincial and territorial programs the CRA administers.

This is why a CCB overpayment often shows up first as a smaller or missing deposit. If a payment did not arrive and you have a recent notice, check the notice before treating it as lost; our CCB not received guide and GST credit not received guide cover the other causes.

What the CRA can keep for each benefit

A CWB overpayment is handled differently: you are told about it on your notice of assessment and it is taken from your refund, rather than billed with a separate voucher. And because CCB payments are not applied to other tax or government debts, a tax balance owing on its own does not reduce your CCB.

Can I set up a payment plan?

Yes. If you cannot repay a benefit overpayment in one amount, call the CRA at 1-888-863-8662, 8 a.m. to 8 p.m. Eastern time, Monday to Friday, to arrange a payment schedule; debts from a tax return use a different line, 1-888-863-8657. You can also pay the balance directly with the remittance voucher or through the CRA's online payment options. If repaying would cause significant financial hardship, even with a plan in place, call the same benefits number to discuss your options.

GIS and OAS overpayments: how Service Canada handles them

Old Age Security (OAS), the Guaranteed Income Supplement (GIS) and the Allowance are run by Service Canada, not the CRA, so a GIS overpayment follows a different route. An amount overpaid in an earlier period is recovered from your gross OAS pension, and the reduction appears in your payment details. Our page on why an OAS payment is lower shows how to spot that line.

Service Canada asks recipients to report changes in address, marital status and income, absences from Canada of more than 6 months, and deaths as soon as possible, because late reports lead to overpayments that must be repaid (Service Canada, while receiving OAS). The current GIS rates are in our GIS amount guide.

Can a GIS or OAS overpayment be cancelled?

Sometimes. Under section 37 of the Old Age Security Act, an overpayment is a debt to the Crown that can be deducted from later benefits, but the Minister may cancel all or part of it when repaying would cause undue hardship, when the overpayment came from erroneous advice or an administrative error, or when the amount cannot be collected or would cost as much to collect as it is worth. This is discretionary, and it is not available after a conviction for a related offence. If one of these grounds fits your case, raise it with Service Canada and keep a copy of what you send.

Service Canada vs CRA overpayments at a glance

How to dispute a benefit overpayment

If you think the recalculation is wrong, you must dispute it within 90 days. For a CRA benefit notice of determination, file a notice of objection within 90 days of the notice date, using Form T400A, Objection (Income Tax Act), or online through your CRA account (CRA, P148 Resolving your dispute). If you missed the deadline for reasons beyond your control, you can ask for an extension.

For OAS or GIS, ask Service Canada for a reconsideration within 90 days of the decision letter, using the Request for Reconsideration of an Old Age Security decision (ISP-3134) or your My Service Canada Account (Service Canada, request a reconsideration). A different officer reviews it, and you can then appeal to the Social Security Tribunal.

1. Find the notice and note its date; the 90 days run from there.
2. Work out which change caused the overpayment: income, marital status, children or residence.
3. Gather proof, such as a custody order, a lease showing separate addresses or a corrected slip.
4. If the facts on file were wrong, file the objection or reconsideration with your proof.
5. If the facts were right but you cannot pay, arrange a payment plan instead.
6. Keep receiving benefits and filing returns on time so future amounts are correct.

For payments that stopped or went missing rather than being reduced, start with our benefit payment not received hub.