Why Is My First Paycheque Taxed So Much?
High tax on your first cheque is common and often temporary — here is what is actually happening.
Written and reviewed by Rocco Clayfield, Founder & DirectorLast reviewed
Short answer
Canadian payroll calculates income tax by projecting your pay period earnings over a full year and applying the graduated tax brackets to that estimated annual income. If you start a job partway through a pay period, earn irregular income, or have not yet submitted a TD1 form, the withholding formula may over-estimate your annual income and deduct more tax than expected. This often corrects itself over subsequent pay periods or at annual tax filing time.
Nothing deflates the excitement of a new job quite like opening your first pay stub and seeing a large chunk missing. It is one of the most common payroll questions Canadians ask, and the short answer is reassuring: high tax on a first cheque is usually a normal consequence of how payroll software calculates withholding, not a permanent state of affairs.
This guide explains why it happens, what the TD1 form does, and what to expect going forward. It is written for new workers, students earning their first employment income, and newcomers to Canada encountering the Canadian tax withholding system for the first time.
One important note before we start: this guide explains how withholding works, not what your final tax bill will be. Whether you receive a refund or owe money when you file your return depends on your full annual income, deductions, and credits. No guide can predict that outcome for you.
What this page helps you check
- Understand why payroll uses an annualizing formula to estimate tax
- Learn how your TD1 form affects how much tax is withheld
- Recognise situations where high first-cheque tax is expected vs possibly incorrect
- Know what steps you can take to adjust withholding going forward
- Understand the relationship between payroll withholding and your annual tax return
- Know when to ask payroll a question vs when to simply wait for the next cheque
How Payroll Calculates Income Tax: The Annualizing Method
Payroll software does not simply apply your marginal tax rate to each cheque. Instead, it takes your earnings for the pay period, multiplies them by the number of pay periods in the year, and calculates the income tax on that estimated annual income. It then divides the result back down to the pay period amount and deducts that.
This method works smoothly when your income is consistent throughout the year. Where it can produce a surprisingly high deduction is when your first cheque represents unusual circumstances: you started mid-way through a pay period, received a signing bonus, had vacation pay included, or your hours were higher than they will normally be.
In those cases, the annualizing formula sees an unusually high pay period and multiplies it into an estimate of your annual income that is higher than your actual expected earnings. The resulting tax deduction is higher than it will be once your income settles into a regular pattern.
The TD1 Form and How It Affects Withholding
When you start a new job, your employer should ask you to complete a TD1 — a Personal Tax Credits Return. The TD1 tells the payroll system which non-refundable tax credits apply to you, such as the basic personal amount, disability amount, or tuition credits if applicable.
If you have not yet submitted your TD1, payroll may default to a minimal credits assumption, resulting in higher tax withholding. Submitting your TD1 as early as possible is one of the most direct ways to ensure withholding is calibrated correctly from the start.
There is a separate federal TD1 and a provincial TD1 for your province. Fill in both. If your circumstances change during the year — for example, you become eligible for an additional credit or you take on a second job — you can submit an updated TD1 at any time.
Why Starting a Job Mid-Year Can Look Like Over-Taxation
If you start work in, say, September, your employer will not withhold tax for the months of January through August — they were not your employer then. But the payroll formula still projects your current pay forward as if you will earn it for a full twelve months, which may push the estimated annual income into a higher tax bracket than your actual partial-year income will reach.
The result is that your withholding during the four months you work might over-collect compared to what you ultimately owe on four months of income. That over-collection is returned to you as a tax refund when you file your return.
This is one of the most common reasons students and seasonal workers receive refunds in the spring — not because of any special planning, just because the withholding formula is conservative when you work for only part of a year.
Newcomers to Canada: What to Expect
If you have recently arrived in Canada, the withholding system may feel unfamiliar. Canada uses a pay-as-you-go system where tax is withheld from every paycheque and remitted to the CRA on your behalf. You do not pay a lump sum to the government yourself — payroll handles it.
When you file your Canadian income tax return each spring (covering income earned January 1 to December 31), the CRA calculates your actual tax liability for the year. If more was withheld than you owed, you receive a refund. If less was withheld, you pay the balance.
As a newcomer, it is important to complete your TD1 forms accurately, understand that you are a resident of a specific province for tax purposes (which affects the provincial tax rate), and keep your pay stubs throughout the year. The CRA and provincial tax agencies have guides for newcomers available on their websites.
When Withholding Normalizes — and When to Ask Questions
For most workers, the withholding on the second and third cheque will be more representative of the ongoing rate. Once your income is regular and your TD1 is on file, the annualizing formula produces a reasonably stable deduction.
If your tax deduction continues to look unexpectedly high after two or three regular pay periods, it is worth checking whether your TD1 was received and entered correctly, and whether your province of employment is set correctly in the payroll system.
You can also request that payroll withhold a specific additional amount if you prefer to over-withhold (some people find this useful for saving toward a large tax bill or for peace of mind). You cannot, however, request that less than the legislated minimum be withheld.
Province & territory note
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.
Tax deduction is extremely high on the second and third regular cheque too
After a couple of regular pay periods, withholding should stabilize. Persistent over-withholding may indicate the TD1 was not entered, the wrong province is on file, or an incorrect annual salary figure is in the payroll system.
No TD1 was given to you when you started
Employers are required to ask new employees to complete a TD1. If you were never given one, ask HR for both the federal and provincial forms and submit them as soon as possible.
CPP or EI are also very high on the first cheque
CPP and EI do not use an annualizing formula the same way income tax does. Unusually high CPP or EI on a first cheque — especially if they seem disproportionate to your gross — may indicate a different issue worth checking.
You have a second job and neither employer knows about the other
If you have two employers and each thinks you have only one job, each will give you the basic personal amount credit, and together they will under-withhold tax. You can address this by adjusting your TD1 at one of the employers to reduce the credits claimed.
Your province of employment on the stub is wrong
Provincial tax rates differ. If the stub shows the wrong province — perhaps from a previous address on file — your withholding calculation will be incorrect. Ask payroll to update your province of employment.
A large bonus was included in your first cheque
Bonuses are generally taxed at a higher rate using a special withholding formula. If your first cheque contained a signing bonus, the tax on that period will look unusually high. This is expected and does not change your actual tax owing — just the timing.
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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.
- “My tax deduction on my first cheque looks higher than I expected. Can you confirm which TD1 amounts are on file for me?”
- “I never filled in a TD1 when I was hired. Can I get both the federal and provincial forms and submit them now?”
- “Is the province of employment shown on my stub correct?”
- “My first cheque included a bonus. Can you explain how the tax was calculated on that amount?”
- “I have a second job. How should I handle my TD1 so I am not under-withheld?”
- “Is there a way to request additional tax withholding each period to avoid a balance owing at filing time?”
Frequently asked questions
Will I get a refund because my first cheque was over-taxed?
Possibly, but it depends on your full-year income and deductions. If more tax was withheld across all your pay periods than you actually owed for the year, you will receive a refund when you file. No one can guarantee a refund in advance.
Can I ask my employer to withhold less tax?
You cannot ask for less than the legally required minimum. You can optimize withholding by submitting an accurate TD1 with all the credits that genuinely apply to you. Some credits that reduce withholding include the basic personal amount, tuition amounts, and disability amounts.
What is the TD1 form and do I have to fill it in?
The TD1 is a federal form (with a matching provincial version) that tells your employer what personal tax credits to apply when calculating your withholding. If you do not submit one, your employer will deduct tax as if you have only the basic personal amount. Filling it in accurately ensures your withholding is as close to correct as possible.
I am a student. Should I expect a refund?
Many students end up with a refund because they work for only part of the year and the withholding formula over-estimates their annual income. If you have eligible tuition amounts, claiming them on your TD1 or carrying them forward on your tax return may reduce the tax you owe. File your return even if you earned a small amount — you may be entitled to benefit credits.
My first cheque covered a partial pay period. Does that affect tax?
Yes. A partial-period cheque may have a disproportionately high or low daily earnings rate depending on how the payroll system handles proration. Tax on the second full-period cheque will typically look more normal.
Does CPP and EI work the same way for first cheques?
CPP and EI are calculated as a flat rate on your earnings for that period, subject to annual maximums. They do not use the same annualizing projection as income tax, so they should look proportionate to your gross pay from the first cheque onward.
I am a newcomer. When do I need to file my first Canadian tax return?
You generally file a Canadian income tax return for the calendar year in which you first became a resident. The filing deadline is April 30 of the following year (June 15 if you or your spouse are self-employed, though taxes owing are still due April 30). The CRA website has a newcomers guide.
What happens if my employer deducted too little tax all year?
You will owe the shortfall when you file your tax return. CRA may also charge interest if the amount owing is above a threshold. You can avoid a large year-end bill by requesting additional withholding through an updated TD1 or a direct request to payroll.
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 Online Calculator — 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.