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Personal Tax · Oshawa & Durham Region

T1 adjustments & ReFILE, to fix or improve past returns

Missed a credit, got a late slip, or made an error on a filed return? You can usually fix it. We prepare T1 adjustments and ReFILE submissions to correct prior returns — often recovering refunds you're owed.

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Correct a return — and claim what you missed

A filed return isn't final. If you forgot a deduction, received a slip late, or discovered an error, the CRA allows you to adjust prior returns — generally up to ten years back. We prepare the change correctly, whether by ReFILE, the CRA's online service, or a T1-ADJ.

What we help with

How it works

A clear, low-stress process — in person, by drop-off, or fully remote.

Review

We review the original return and identify what should change.

Prepare

We prepare the ReFILE or T1-ADJ with supporting detail.

Submit

We submit the adjustment to the CRA.

Track

We follow it through to reassessment and any refund.

Questions, answered

How far back can I adjust a return?

You can change a return for the current year and, in most cases, going back up to ten previous calendar years. Within the normal reassessment period (generally three years from your notice of assessment) a correct adjustment is processed as a matter of course; beyond that, going back as far as ten years is allowed at the CRA's discretion under taxpayer relief. We prepare the request the right way for your situation.

What is ReFILE?

ReFILE is an electronic service to adjust a recently filed return. It's fast and convenient when eligible; otherwise we use a T1 Adjustment Request.

Can I recover a credit I forgot to claim?

Usually yes. If you missed a deduction or credit, an adjustment can correct it and often produces a refund. We handle the request.

Will adjusting my return trigger a review?

An adjustment is a normal CRA process. We prepare it with proper support so it's straightforward and audit-ready.

Can I apply a newly approved DTC to past years?

Yes — once the Disability Tax Credit is approved, prior returns can often be adjusted to claim it retroactively. We coordinate both.

Serving individuals and families across Durham Region: Oshawa · Whitby · Ajax · Pickering · Courtice · Bowmanville · Clarington · Newcastle · Port Perry · Uxbridge.

Ready to get started?

Book a free consultation and we'll match you with the right service and a clear, no-jargon plan.

Book a free consultation