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Tax mistakes in retirement can quietly drain your savings — here’s how to confidently and avoid overpaying if filing on your own

If you’re retired, tax season can feel deceptively simple, but maybe also a little daunting. Paycheques are gone, routine payroll deductions have stopped and it’s easy to assume your return will be straightforward. But retirement income comes with its own set of rules, deadlines and potential traps — and missing even one can quietly cost you real money.

As a retiree, you’re also on a fixed income and tax specialists don’t come cheap. Certainly, doing your own taxes can save the cost of hiring an accountant, and that can be appealing when every dollar counts.

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While professional help can be useful, you pay for that expertise. And for retirees with a simpler financial picture, filing on your own can be entirely manageable, if you know what to watch for.

The key is doing it carefully, confidently and thoughtfully, rather than letting worry or uncertainty take over.

Know the deadlines and start early

For retirees, the key date is April 30 — the day your return is due and any balance owing for the previous calendar year must be paid. So if you’re filing in spring 2026, you’re settling up taxes on income received in 2025, whether that came from pensions, investments or government benefits. If you or your spouse has self-employment income in retirement, you have until June 15 to file, but any amount owed for that prior tax year is still due April 30.

Starting early matters more than you may think. Pension slips, investment statements and benefit summaries don’t always arrive at the same time, and rushing can increase the chance of mistakes. Giving yourself extra time allows you to gather everything carefully, review credits you may qualify for and pause if something doesn’t look right.

If questions arise, help is available. Many communities offer free tax clinics specifically for seniors with modest or fixed incomes, with trained volunteers who can walk you through the process step by step. Filing on your own doesn’t mean navigating tax season alone, it simply means taking it one careful step at a time.

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Take advantage of pension income splitting

One way some couples reduce their overall tax bill in retirement is through pension income splitting. If both you and your spouse or common-law partner were residents of Canada on December 31 and you received eligible pension income, you may be able to elect to split up to 50% of that income.

Shifting income from the higher earner to the lower earner can reduce a couple’s combined tax burden in certain situations. Couples who choose to do this must jointly complete Form T1032, Joint Election to Split Pension Income, and file it with their return.

It’s a relatively straightforward election, yet one many retirees overlook. Small adjustments like this can sometimes make a meaningful difference in your refund or the taxes owed.

Check your tax credits carefully

Several tax credits are geared specifically toward older Canadians.

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The age amount, available to Canadians 65 and older (subject to income thresholds), can reduce federal taxes owing. The pension income amount may also apply if you have eligible pension income.

Other credits — such as the GST/HST credit or the Canada caregiver credit — may apply depending on your situation.

Understanding what applies to you, and ensuring it’s entered correctly, can help prevent overpaying. Taking the time to review available credits is one of the most practical ways to file confidently.

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If this is your first year filing in retirement

The first tax season after you retire can feel different from any you’ve filed before.

Instead of a T4 slip from an employer, you may now receive a mix of slips — such as T4A(P) for CPP, T4A(OAS) for Old Age Security, T4RSP or T4RIF if you’ve begun drawing from registered accounts. Depending on when you retired, you may even have both employment income and pension income in the same tax year.

Another shift is how tax is withheld. During your working years, payroll deductions were automatic and often predictable. In retirement, withholding on pensions or RRIF withdrawals may be lower than you expect — or optional in some cases. That can sometimes lead to a surprise balance owing in your first year.

Because this transition year can include several moving pieces, many retirees find it helpful to give themselves extra time, review every slip carefully and make sure nothing is missing before filing.

Watch out for benefit clawbacks

It’s easy to think of retirement income as simply cash flow. But income levels can affect government benefits.

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For example, the Old Age Security pension is subject to a recovery tax if net income exceeds certain annual thresholds. For the 2025 tax year, income above roughly $93,454 can trigger partial repayment, and at higher income levels the benefit may be fully clawed back.

Being aware of these thresholds can help retirees better understand how different income sources interact. In some cases, timing of withdrawals or income sources may influence overall tax and benefit outcomes.

Keep good records and be realistic about claims

It can be tempting to claim every expense possible, but large or unusual claims may draw additional scrutiny from the Canada Revenue Agency.

A practical approach includes:

  • Keeping receipts and documentation for every claim
  • Using CRA-certified software or consulting a qualified preparer if needed
  • Being accurate and reasonable rather than aggressive

Organized records can help you file with greater confidence and reduce stress if questions arise later.

File with confidence

Retirement should feel like a reward for a lifetime of work — not a source of anxiety each spring.

By understanding deadlines, reviewing available credits, being aware of how income affects benefits, keeping clear records and taking extra care in your first year of retirement, you can approach tax season with more clarity and control.

Filing your own return can be empowering. Done thoughtfully, it helps ensure your retirement income works for you — not the other way around.

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Leslie Kennedy Senior Content Editor

Leslie Kennedy served as an editor at Thomson Reuters and for Star Media Group, followed by a number of years as a writer and editor and content manager in marketing communications, before returning to her editorial roots. She is a graduate of Humber College’s post-graduate journalism program and has been a professional writer and editor ever since.

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