Federal Income Tax Deduction on Your Pay Stub
Understand what drives your federal tax withholding and whether your deduction looks right for your situation.
Written and reviewed by Rocco Clayfield, Founder & DirectorLast reviewed
Short answer
Federal income tax is withheld from each pay period based on your annualized earnings and the personal tax credits you have claimed on your TD1 federal form. The amount withheld is not your final tax bill — it is an estimated prepayment. Your actual tax owing is calculated when you file your annual income tax return with the CRA. If too little tax was withheld across the year, you will owe a balance; if too much was withheld, you will receive a refund.
Federal income tax withholding is typically the largest single deduction on a Canadian pay stub. Unlike CPP or EI, which have fixed rates up to a ceiling, federal income tax is calculated using a progressive rate structure — meaning higher portions of your income are taxed at higher rates. Your employer uses the CRA's prescribed withholding tables to estimate how much tax to deduct each pay period.
The amount withheld depends primarily on your annualized earnings and the federal personal tax credits you have claimed on your TD1 form. Claiming additional credits — such as the basic personal amount, disability amount, or tuition credits — reduces the tax deducted from your pay. If your TD1 is not up to date, your withholding may not reflect your actual situation.
Federal income tax withholding is an estimate. You settle the exact amount when you file your T1 personal income tax return each spring. Most people receive a refund because their employer withheld slightly more than required, but if your withholding is lower than your actual tax liability — perhaps due to other income sources — you may owe a balance owing at filing time.
What this page helps you check
- Whether a federal tax line appears on your pay stub each pay period
- Whether the withholding amount changed after you submitted a new TD1 form
- Whether a bonus or lump-sum payment caused an unusually high tax deduction
- Whether your year-to-date federal tax total is tracking with your expectations
- Whether a recent life change (new job, salary change, second job) may warrant a TD1 review
- Whether your pay stub shows your net claim code or TD1 status
- Whether the tax deduction looks consistent across pay periods of equal earnings
- Whether additional withholding you requested via your TD1 is being applied
How Federal Tax Withholding Is Calculated
Your employer annualizes your pay period earnings and looks up the applicable withholding amount in the CRA payroll deductions tables. The result is then adjusted for your personal TD1 claim amount. The higher your TD1 claim amount, the lower the tax withheld from each cheque.
The CRA publishes updated payroll deductions tables each year (and sometimes mid-year) to reflect changes to tax brackets and personal amounts. Employers are required to use the current tables. If your employer is using outdated tables, your withholding may be systematically off — this would typically show up as a consistent over- or under-deduction relative to what you would expect.
The TD1 Form and Your Withholding
When you start a new job, your employer asks you to complete a federal TD1 form (and a provincial TD1 for your province). This form lets you declare the personal tax credits you are entitled to claim, such as the basic personal amount, spouse or common-law partner amount, caregiver amount, disability amount, and others. The sum of your claimed amounts is used to calculate a reduced withholding.
If your personal situation changes — you marry, you have a child, a dependant's circumstances change, or you are eligible for a new credit — you should submit a new TD1 to your employer. Until you do, your employer will continue withholding based on your last submitted form. You can also use the TD1 to request additional withholding beyond the calculated amount, which can help avoid a balance owing at tax time if you have other income sources.
Bonuses and Lump-Sum Payments
A bonus or other lump-sum payment will usually result in a much larger tax deduction in that pay period than you might expect. This is because the CRA requires lump-sum payments to be taxed at a specific withholding rate, or because the annualization of the bonus pushes your earnings into a higher bracket for that period. The elevated deduction is not an error in most cases — it reflects the higher marginal rate applicable to the additional income.
If a large lump-sum tax deduction leaves your net pay unexpectedly low, review your pay stub to confirm the amount is labelled as a lump-sum withholding. If the deduction appears to be a regular-rate calculation applied incorrectly, it is worth asking payroll to confirm the method used.
Reconciling at Year-End
Your total federal tax withheld for the year appears in Box 22 of your T4 slip. This figure is applied against your tax liability when you file your T1 return. If your T4 Box 22 total is significantly different from the sum of the federal tax deductions on your pay stubs, ask your employer to review the T4 before you file.
If you consistently receive large refunds, you may be having too much tax withheld — while a refund is not inherently bad, it means you have given the government an interest-free loan during the year. Reviewing your TD1 claim amounts could reduce withholding and increase your take-home pay each period.
Quebec works differently
Common red flags worth checking
These do not automatically mean there is an error. They are simply lines worth a closer look, or worth asking payroll to explain.
Federal tax deduction is zero for multiple pay periods
A zero tax deduction occasionally happens due to high TD1 claims or specific payroll situations, but if it persists without a clear reason, check that your TD1 claim amount has not been entered incorrectly or that your pay is not being processed through an incorrect tax code.
Tax withholding did not change after you submitted a new TD1
Your employer should update your withholding within a reasonable period after receiving a new TD1. If your deduction has not changed after a few pay periods, confirm that payroll processed the form.
Very large federal tax deduction on a regular pay period without a bonus
If your pay rate has not changed and there is no bonus, a sudden spike in federal tax withholding could reflect a data entry error, an incorrect adjustment, or a catch-up from a previous under-deduction. Ask payroll to explain.
Federal tax and provincial tax lines are combined into one
Federal and provincial income tax should be shown as separate line items on your pay stub. A combined figure makes it harder to verify each component independently.
T4 Box 22 does not match your YTD federal tax total
These should match closely. A significant discrepancy between your T4 and your pay stub year-to-date total is worth investigating before you file your income tax return.
Second job income not accounted for in withholding
If you have multiple jobs and each employer withholds based only on the income from that job, your combined withholding may be less than your actual tax liability. You can request additional withholding on one employer's TD1 to compensate.
Want this checked on your real pay stub?
Upload your pay stub or payroll document and get a plain-English breakdown with possible questions to ask payroll.
What to ask payroll or HR
Calm, specific questions get clearer answers. You can copy any of these, or build a full message with the Payroll Message Generator.
- “Can you confirm which TD1 claim amount is currently on file for me and that it matches the form I submitted?”
- “Why did my federal tax withholding change significantly this period when my pay rate has not changed?”
- “I submitted a new TD1 form three pay periods ago — can you confirm it has been applied?”
- “Can you explain how the tax on my bonus was calculated and which withholding method was used?”
- “I have a second source of income this year — can I request additional federal tax withholding on my pay here to avoid a balance owing?”
- “Can you confirm that Box 22 on my T4 will match the YTD federal tax total on my pay stubs?”
Frequently asked questions
Is federal income tax the same rate for everyone?
No. Canada uses a progressive tax system. Different portions of your income are taxed at different rates. The more you earn, the higher the rate applied to the top portion of your income. Your employer withholds based on your estimated annual income using the CRA's withholding tables.
What is the TD1 form and do I need to fill one out?
The TD1 is the federal Personal Tax Credits Return. You complete it when you start a job and whenever your credit situation changes. It tells your employer how much to withhold from your pay. If you have never submitted one, your employer may be withholding at the basic personal amount only, which may not reflect your full credits.
Why is my federal tax so much higher in a month I received a bonus?
Bonuses are typically taxed at a higher withholding rate or are annualized in a way that pushes the calculation into a higher tax bracket for that period. This is normal. It does not mean your bonus is taxed at a permanently higher rate — the excess withholding is reconciled when you file your annual return.
What happens if my employer withholds too much federal tax?
You will receive a refund from the CRA when you file your T1 income tax return for the year. The refund is based on the difference between what was withheld and your actual tax liability, after all credits and deductions are applied.
Where does federal tax appear on my T4?
Total federal income tax withheld for the year is in Box 22 of your T4 slip.
Can I ask my employer to withhold less federal tax?
You can request reduced withholding by applying to the CRA for a letter of authority (if you have significant deductions the payroll system cannot account for), but generally you cannot simply ask your employer to withhold less without CRA authorization.
Can I ask my employer to withhold more federal tax?
Yes. You can request additional withholding by entering an amount on Line 3 of your federal TD1 form. This is useful if you have other income sources (rental income, freelance income) that will create a tax liability at filing time.
What is the difference between federal tax withheld and my actual federal tax owing?
The withholding from your pay is an estimate based on your salary and TD1 claims. Your actual tax is calculated on your T1 return after accounting for all income sources, deductions, and credits. The difference results in either a refund or a balance owing.
Official sources for this page
Every figure here is derived from these. Where a number matters to you, read it at the source — PayStub IQ Canada explains the rules, it does not set them.
- Guide T4127, Payroll Deductions Formulas — Canada Revenue Agency
- Payroll deductions and contributions — Canada Revenue Agency
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Helpful guidance, not advice
PayStub IQ Canada provides educational payroll explanations based on the information visible in your document. It does not provide legal, tax, accounting, payroll, CRA, Revenu Québec, or employment standards advice. For official decisions or corrections, contact your employer, payroll department, CRA, Revenu Québec, your provincial or territorial employment standards office, or a qualified professional.