Your tax withholding should be reviewed mid-year, typically around June or July, to catch any gaps before December 31, 2026. If your life circumstances have changed (new job, major deductions, investment income, or family status), your withholding may no longer match what you'll actually owe. A quick review now means you can make adjustments through your employer, adjust installment payments, or plan ahead for a potential tax bill. Most Canadians don't realize their withholding is off until they file their return the following spring, but proactive mid-year filers can avoid stress and penalties. Your employer withholds tax from each paycheque based on a form you filled out (usually when you started the job). That form assumes your income, deductions, and credits stay the same all year. But life changes, and so does your tax picture. Common mid-year triggers that affect withholding include: - A promotion or job change that bumps your salary - Spouse or partner starting work (or stopping work) - Birth or adoption of a child - Major RRSP contributions or other deductions - Investment income from stocks, bonds, or rental properties - Second income from freelance or side work - Significant medical or charitable expenses - Changes
Mid-year (June or July) is ideal because you still have time to adjust before year-end. This gives you enough data from six months of pay to spot patterns and enough time to make corrections.
Yes. You can update your TD1 form whenever your circumstances change (job change, marriage, child birth, major deduction). There's no limit on how many times you can file a new TD1 with your employer.
Yes, even more so. Self-employed Canadians must track quarterly tax installments and income. A mid-year review helps ensure you're on pace to meet CRA installment deadlines and avoid penalties.
No. A withholding review is simply checking if your employer is holding the right amount of tax. You can't officially file your 2026 tax return until after December 31, 2026.
You mainly need your employment information (job title, salary, any bonuses) and details of major life changes (new dependents, large deductions, second income). Your payroll team will handle the TD1 form itself.