Your province of residence on December 31 is the only date that matters for Canadian income tax purposes — not where you worked, where you were born, or where you lived for most of the year. If you moved between provinces and filed under the wrong one, the fix is simple but worth doing promptly, because provincial tax rates and credits vary significantly.
Why province matters more than you might think
Provincial income tax can represent 30–50% of your total tax bill. Rates vary considerably:
| Province | Top combined federal + provincial rate (2025) |
|---|---|
| Alberta | ~48% |
| Ontario | ~53.5% |
| BC | ~53.5% |
| Nova Scotia | ~54% |
| Quebec | ~53.3% |
| PEI | ~54.5% |
On lower and middle incomes, the gap is even more pronounced. Alberta’s bottom tax bracket is just 8% (on income up to $61,200), the lowest starting rate of any province, while most other provinces begin taxing at a higher rate. Filing under the wrong province can mean owing hundreds to thousands more — or getting back more than you should have.
Provincial tax credits also vary by province — the Ontario Trillium Benefit, BC Climate Action Tax Credit, and Alberta’s various rebates are only available to residents of those provinces on December 31. Claiming the wrong province means you may have missed credits you were entitled to, or incorrectly claimed ones you were not.
The December 31 rule: examples
Example 1 — Moved from Ontario to Alberta on March 15: You are an Alberta resident for the entire tax year. File as Alberta.
Example 2 — Moved from BC to Nova Scotia on November 30: You are a Nova Scotia resident for the tax year. Nova Scotia has higher rates — you may owe more than if you had filed as BC.
Example 3 — International move — arrived in Canada from the US on September 1: You are a Canadian resident from September 1 onward and file a Canadian return for the portion of the year you were resident. Your province is wherever you settled on December 31. See am I a Canadian tax resident for part-year residency rules.
How to fix a wrong province on your return
CRA My Account — Change My Return (fastest, ~2 weeks)
- Log in to CRA My Account and select Change My Return
- Choose the tax year
- Update your province of residence (the personal information section of the return)
- The CRA system will recalculate your provincial tax, provincial credits, and any income-tested provincial benefits
- Submit with a brief explanation: “Correcting province of residence — resident of [correct province] on December 31”
If the correction results in you owing more provincial tax, the CRA will issue a revised Notice of Assessment with a new balance. If you over-paid provincial tax, you will receive a refund.
Tax software amendment (2–3 weeks)
Open your saved return, change the province in the personal information section, and re-NETFILE the amendment.
Mail T1-ADJ form (6–8 weeks)
Complete the T1-ADJ form indicating the province change and the resulting line corrections, and mail it to your CRA tax centre.
Common reasons for a wrong province
- Moved late in the year — people assume they file for where they lived most of the year
- Student returning home — a student who lived in Ontario for school but moved back to Alberta in December is an Alberta filer
- Remote worker — if you work remotely for a company headquartered elsewhere, your province is still where you live on December 31
- New immigrant — province is wherever you first established residence in Canada
- Military posting — special rules may apply; the province where your family resides typically governs
Did you also forget to claim moving expenses?
If you moved provinces for work or school, you may be entitled to deduct moving expenses against income earned at your new location. The full rules for moving expense deductions explain what qualifies — movers, travel, temporary lodging, real estate costs, and more. This deduction is often missed alongside the province correction.
Fix your TD1 going forward
Your TD1 provincial form tells your employer which provincial personal amounts to apply to your payroll. If you moved and have not updated it, your employer is withholding based on the wrong province. Submit a corrected TD1 provincial form to your payroll department. The TD1 form guide explains how to complete it.
For the complete amendment process and other common filing errors, see I made a mistake on my tax return. To compare how much provincial tax you would pay in each province, the lowest-tax provinces guide has a full breakdown.