Tax season has a way of sneaking up on people. One minute it's January, and the next you’re digging through emails, searching for receipts, and hoping you didn’t forget anything important.

The truth? Even small mistakes on a personal tax return can lead to delays, reassessments, penalties, or missed refunds. At Stoutenberg & Company, we’ve seen it all — and most errors are completely avoidable with the right preparation and guidance.

Let’s walk through some of the most common personal tax return mistakes—and how you can avoid them this year.

1. Forgetting to Report All Your Income

This one happens more than you’d think.

Maybe you changed jobs mid-year. Maybe you did a little freelance work on the side. Maybe you earned some investment income and forgot about that T5 slip sitting in your inbox.

The Canada Revenue Agency, CRA, receives copies of most tax slips directly from employers and financial institutions. So if something is missing on your return, they’ll likely notice, and that can lead to a reassessment.

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How to avoid it:
Before filing, double-check that you’ve included every source of income. Log in to your CRA My Account and compare what they have on file with your own records.

2. Claiming Deductions You Don’t Actually Qualify For

We get it; everyone wants to reduce their tax bill. But claiming deductions or credits you’re not eligible for can create bigger problems down the road.

Common grey areas include:

• Home office expenses
• Moving expenses
• Medical costs
• Tuition credits
• Childcare deductions

Each of these comes with specific rules. What worked for your friend might not apply to your situation.

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How to avoid it:
If you’re unsure about eligibility, don’t guess. A quick check now can save you from a frustrating adjustment later.

3. Simple Data Entry Mistakes

Even with tax software, mistakes happen.

A typo in your SIN. A transposed number on a T4. An extra zero was added by accident. Small errors can delay your return or change your refund amount significantly.

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How to avoid it:
Slow down during the final review. Double-check names, numbers, and banking details before hitting submit.

4. Missing Credits You Are Entitled To

Interestingly, just as many people miss out on credits they do qualify for.

You might be eligible for benefits like:

• Canada Workers Benefit
• GST/HST credit
• Disability tax credit
• First-time home buyers’ amount

Tax rules evolve regularly, and new credits are introduced or adjusted. It’s easy to overlook something if you’re not watching for it.

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How to avoid it:
Stay up to date, or work with someone who does. It’s surprising how often a simple conversation uncovers savings people didn’t realize were available.

5. Not Keeping Receipts and Documentation

The Canada Revenue Agency can request documentation to support your claims, sometimes years after you file.

If you can’t produce receipts or proof of eligibility, your deduction may be denied.

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How to avoid it:
Keep organized digital or physical copies of your tax documents and receipts for at least six years. It may feel tedious, but future you will be grateful.

6. Filing Late, Especially If You Owe

Life gets busy. Deadlines sneak up.

But filing late can mean penalties and interest, particularly if you owe taxes. Even if you can’t pay the full balance right away, filing on time helps reduce additional charges.

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How to avoid it:
Start gathering your documents early and mark important tax dates on your calendar. If you’re feeling overwhelmed, don’t wait until the last minute to ask for help.

7. Not Updating Life Changes

Big life events can impact your taxes more than you might expect:

• Getting married or divorced
• Having a child
• Buying or selling a home
• Starting a business
• Retiring

If your return doesn’t reflect these changes, it can affect both your tax bill and any government benefits you receive.

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How to avoid it:
Make sure your return accurately reflects your current situation and update the CRA if necessary.

The Bottom Line

Filing your taxes doesn’t have to be stressful, but it does require attention to detail.

A rushed return can lead to missed opportunities or unnecessary headaches. A careful, informed approach gives you confidence that everything is done correctly the first time.

At Stoutenberg & Company, we believe tax season shouldn't feel overwhelming. With the right support, it can actually be straightforward, even empowering.

If you’re unsure about your personal tax situation or simply want peace of mind before filing, we’re here to help.

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