GIS supplement estimate.
Monthly GIS
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Your breakdown
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A top-up for low-income seniors, not a pension
The Guaranteed Income Supplement is a monthly, tax-free payment that rides on top of Old Age Security for seniors with little other income. You cannot collect GIS without first qualifying for OAS, and the amount you receive shrinks as your other income rises. It is targeted relief, designed so that the poorest retirees are not left living on OAS alone. This calculator estimates your monthly GIS from your income and your marital status, applying the reduction that scales the benefit down. Roughly a third of OAS recipients collect some GIS, so this is not a fringe benefit, it is a core part of how Canada keeps senior poverty low. The income that counts is your income from the previous calendar year, which is why a one-time spike, such as cashing out an investment, can cut your GIS for the following year even if your situation has since normalized.
The 50 cent reduction that defines GIS
For a single senior, GIS is clawed back by roughly 50 cents for every dollar of other income, and the payment reaches zero once income passes about $22,056. For a couple where both partners are 65 or older, each receives a lower base and the cut-off sits near $29,136 combined. The maximums this tool uses are $1,072.93 a month for a single senior and $645.92 a month for each member of a qualifying couple. That 50 percent reduction stacks on top of regular income tax, which is why a dollar of extra income can feel punishing for a GIS recipient.
A single senior with $8,000 of other income
Suppose you are single and have $8,000 of income beyond OAS, perhaps a small CPP cheque plus a little interest. The annual maximum is $1,072.93 times 12. Your income reduces that by 50 percent of $8,000, which is $4,000. The remaining benefit, spread back over twelve months, is what you collect.
The line below traces the benefit down. It starts at the single maximum near $1,073 a month with zero outside income and falls steadily until it hits zero around $22,056 of income.
A simplification this estimate makes
This is a planning estimate, not a Service Canada determination, and it deliberately keeps the math clean. In the real program, the first $5,000 of employment or self-employment income is fully exempt, and the next $10,000 is partially exempt, so a working senior keeps more GIS than a flat 50 percent cut suggests. This tool does not model that exemption, so if your income is from a part-time job rather than pensions or interest, your actual GIS will be higher than the figure shown here. Treat the result as a floor for working seniors and a close estimate for those living on investment and pension income.
Frequently asked questions
Does an RRSP or RRIF withdrawal reduce my GIS?
Yes, and this catches many seniors off guard. RRSP and RRIF withdrawals are fully taxable income, so they count toward the income that claws back GIS at 50 cents on the dollar. Combined with regular tax, withdrawing from a registered account in your late 60s can carry an effective cost well above your nominal tax rate. Some retirees draw down their RRSP in their early 60s, before OAS and GIS begin, precisely to avoid this collision.
Is GIS taxable, and do I have to apply every year?
GIS itself is tax-free and does not show up as taxable income. You generally need to apply once, and after that your eligibility is renewed automatically each year as long as you file your tax return on time. Filing is the trigger, so a senior who skips a return can have their GIS suspended even when they still qualify.