Old Age Security (OAS) and the Guaranteed Income Supplement (GIS) are both federal benefits for seniors, but they serve different purposes. OAS is a pension based mainly on age and Canadian residence, while GIS is an income-tested supplement available to qualifying low-income OAS pensioners living in Canada. The easiest way to understand the difference is that GIS sits on top of OAS rather than replacing it. You cannot receive GIS without qualifying for an OAS pension, including a full or partial OAS pension.
OAS vs. GIS at a Glance
| Feature | OAS | GIS |
|---|---|---|
| Type of benefit | Federal pension | Income-tested supplement |
| Minimum age | 65 | 65 |
| Must receive OAS first? | No | Yes |
| Based on Canadian residence history? | Yes | OAS entitlement must first be established |
| Income-tested? | High income can trigger recovery tax | Yes, eligibility and payment depend on income |
| Spouse’s income relevant? | No for the individual OAS recovery tax | Yes, for couples |
| Taxable? | Yes | No |
| Can generally continue long-term outside Canada? | Yes, if the applicable residence requirements are met | No |
| Payments adjusted for inflation? | Yes | Yes |
These differences matter because two people with similar OAS pensions can receive very different GIS amounts, or one may receive no GIS at all.
The Biggest Difference Is How Income Affects Each Benefit
Income plays a much larger role in GIS. Under the July to September 2026 rules, a single, divorced or widowed person must have annual income below $22,800 to qualify. For couples, the GIS income threshold varies according to whether the spouse or common-law partner receives OAS or the Allowance.
OAS works differently. A person can receive it with considerably more income, although sufficiently high individual income can result in some or all of the pension being recovered through the OAS recovery tax. This makes GIS much more directly targeted at seniors with lower incomes.
There is another practical difference for couples. A GIS calculation can use the couple’s combined income, while OAS entitlement and the recovery tax are assessed for each recipient individually.
OAS and GIS Payment Amounts Are Calculated Differently
Your OAS pension amount can depend on how long you lived in Canada after turning 18. Age also matters because the pension receives an automatic increase after a recipient turns 75.
GIS instead changes according to income and marital status. For July through September 2026, the maximum GIS payment is $1,123.17 per month for a single, widowed or divorced recipient. A recipient whose spouse or common-law partner receives a full OAS pension can receive up to $676.09 per month during the same period.
That also means there is no single combined OAS-and-GIS amount that applies to every eligible senior. The OAS and GIS calculator is more useful when you want an estimate based on an individual situation.
OAS Is Taxable, but GIS Is Not
The OAS pension is taxable income. GIS receives different tax treatment. Although the supplement is reported on the tax return, an offsetting deduction makes GIS effectively non-taxable.
This difference is easy to miss because both benefits can appear on the same T4A(OAS) tax slip. Seeing both amounts on a tax document does not mean they receive identical tax treatment.
Living Outside Canada Affects OAS and GIS Differently
OAS can continue while someone lives abroad if the person meets the applicable OAS residence requirements. In particular, Canadian residence history can allow the pension to continue after a prolonged absence. GIS has a stricter connection to living in Canada. Under the 2026 rules, the supplement cannot be paid for a month after the recipient has been outside Canada for six consecutive months, excluding the month of departure. The Old Age Security Act sets this limitation even when the underlying OAS pension can continue.
What OAS and GIS Have in Common
Despite their different purposes, both benefits belong to Canada’s Old Age Security program and are paid monthly. Neither requires a history of CPP contributions or employment, so someone does not need to have worked in Canada to qualify on that basis.
Their payment rates also share the same inflation protection. Under the 2026 rules, OAS benefits, including GIS, are reviewed in January, April, July and October using changes in the Consumer Price Index. Payment rates can rise when the cost of living increases but do not fall when the CPI decreases. For someone trying to determine which benefits may apply, check OAS eligibility first. Once OAS entitlement is established, income and marital status determine whether GIS may be added.
Other Questions About OAS and GIS
Can you delay GIS to get a larger payment later?
No. The delayed-retirement increase available for OAS does not apply to GIS. In fact, there is no benefit to delaying OAS when you are eligible for GIS because you cannot receive the supplement while your OAS pension is deferred.
Does turning 75 increase GIS?
No. The automatic increase to OAS after age 75 does not increase the GIS payment because of the recipient’s age. The 2026 OAS payment rules specifically exclude that increase from the GIS calculation.
Can someone receive a partial OAS pension and still qualify for GIS?
Yes. A partial OAS pension does not automatically disqualify someone from GIS. The person must still satisfy the GIS eligibility requirements, including the applicable income and Canadian residence conditions.
Can GIS change from one year to the next even if OAS continues?
Yes. GIS entitlement is reassessed using income information, so a change in income can change the supplement or cause it to stop. Filing an income tax return on time allows the annual GIS reassessment to be completed using updated income information.
