Working in Retirement: Here’s How It Affects Your CPP and OAS

More Canadians are returning to work, part-time or otherwise, after starting their CPP or OAS, whether by choice or necessity. The reassuring fact is that neither program includes an earnings penalty i.e. there’s no clawback mechanism that directly reduces your monthly CPP or OAS payment simply because you’re working.

What actually happens is more nuanced, involving mandatory contributions in some cases, a boost to your future CPP through the Post-Retirement Benefit, and income-based effects on OAS and GIS that are worth understanding before you assume working has no impact at all.

This guide covers what happens to your CPP and OAS when you work in retirement, how the Post-Retirement Benefit works, and what to watch for with OAS clawback and GIS.

Working Doesn’t Directly Reduce Your CPP or OAS Payment

This is worth stating plainly, since it’s one of the most common misconceptions retirees have. Neither CPP nor OAS includes a “work test” that reduces your monthly benefit simply because you have employment income. You can work as much as you want, in any job, without your existing CPP or OAS payment shrinking as a direct result.

What actually changes are contribution obligations (for CPP specifically) and how your total income interacts with income-tested programs and tax brackets, which is a different thing from your pension itself being cut.

CPP Contribution Rules While Working

Whether you’re required to keep contributing to CPP while collecting it depends entirely on your age.

If you’re self-employed, you’re responsible for both the employee and employer portions of the contribution during any period contributions are required or elected.

Workers in Quebec follow a related but separate structure through the Quebec Pension Plan (QPP), which offers its own retirement pension supplement rather than the federal Post-Retirement Benefit described below.

The Post-Retirement Benefit (PRB)

Every year you contribute to CPP while already collecting your CPP retirement pension, between ages 60 and 70, you earn a Post-Retirement Benefit (PRB). PRB is a separate, permanent, lifetime addition stacked on top of your existing monthly CPP payment, and it begins the January following the year you made the qualifying contributions.

The maximum new PRB for someone starting it at age 65 in 2026 is $54.69 a month, based on contributing at the maximum level throughout 2025.

Your actual PRB will be smaller if you earned and contributed less than the maximum, since the benefit is calculated proportionally to your contribution level. A part-time worker contributing at half the maximum rate would generally earn roughly half the maximum PRB for that year.

The important part is that these amounts compound over time. If you work and contribute for several years while collecting CPP, each year adds its own separate PRB on top of the ones from previous years, meaning your total monthly CPP payment can grow the longer you keep working and contributing, right up until contributions stop at 70.

Is it worth it financially?

This depends on how long you expect to live, since the PRB functions like a small additional lifetime annuity purchased with your contributions.

Some analyses suggest it can take roughly 13 to 15 years of collecting a given year’s PRB to fully recover the contributions that funded it, which means the PRB tends to pay off best for people who expect to live well into their 80s or beyond, and is less clearly worthwhile for someone with a shorter life expectancy or an urgent need for take-home cash today.

Should You Elect to Stop Contributing Between 65 and 70?

Once you turn 65, you gain the option to stop CPP contributions using Form CPT30, even if you’re still working. A few situations where electing out tends to make more sense:

• You have a shortened life expectancy, since the PRB’s value depends heavily on collecting it for many years.
• You need every dollar of current cash flow, since stopping contributions immediately increases your take-home pay by the amount that would otherwise go to CPP.
• You’re already near or above the OAS clawback threshold, since additional contributions don’t change your clawback exposure, but the underlying employment income generating those contributions might.

Conversely, continuing to contribute tends to make more sense for healthy retirees who don’t urgently need the extra take-home cash and want to maximize their guaranteed, inflation-indexed lifetime income through their late 60s and beyond.

OAS itself isn’t reduced simply because you’re earning employment income, the same no-penalty principle that applies to CPP. What matters is your total net income across all sources, including employment income, CPP, RRIF withdrawals, and investment income, since that combined figure is what determines whether the OAS recovery tax or clawback, applies.

For the 2025/2026 OAS recovery period, the clawback begins once your net income exceeds approximately $93,454, reducing your OAS by 15 cents for every dollar of income above that threshold, until it’s fully eliminated at a higher income level.

Since employment income is added directly to your net income for this calculation, meaningful earnings from work can push a retiree into clawback territory who wouldn’t otherwise be there, even though the mechanism isn’t the same as a direct reduction tied to working itself.

How Working Affects GIS

This is the area where working has the most direct and immediate impact, and it’s worth understanding clearly if GIS makes up part of your income.

Unlike OAS, the Guaranteed Income Supplement is specifically designed as a needs-tested benefit for low-income seniors, and it’s far more sensitive to any additional income, including employment earnings, than OAS is.

Even modest employment income can meaningfully reduce your GIS payment, since GIS calculations are based on your total income from the prior year, and the reduction can be substantial relative to how much you actually earned from work.

If GIS makes up a significant share of your retirement income, it’s worth running the numbers carefully before taking on paid work, since the net financial benefit of a part-time job can end up smaller than expected once the GIS reduction is factored in.

A Practical Example

Consider someone who starts CPP at 62 and takes on part-time work earning $25,000 a year. Between 60 and 64, their CPP contributions on that income are mandatory, generating a modest PRB that begins the following January and continues for life.

If they keep working past 65, they can choose whether to keep contributing. Assuming their total income, CPP, any workplace pension, and employment earnings combined, stays below the OAS clawback threshold, their OAS remains untouched.

If they also happen to qualify for GIS, however, that $25,000 in employment income would likely reduce their GIS payment noticeably, since GIS responds to income much more aggressively than OAS does.

Related: How Long Will $1 Million Last in Retirement in Canada?

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