TD1 Personal Tax Credits Return Explained
How the TD1 tells your employer how much income tax to withhold — and when to update it.
Written and reviewed by Rocco Clayfield, Founder & DirectorLast reviewed
Short answer
The TD1 Personal Tax Credits Return is a form you complete and give to your employer when you start a job or whenever your personal tax credit situation changes. It tells your employer how many non-refundable tax credits you are claiming, which determines how much federal and provincial income tax to withhold from your pay. Everyone is entitled to at least the basic personal amount; additional credits exist for age, disability, dependent caregiving, and other situations. If your credits are understated on the TD1, too much tax is withheld; if they are overstated, too little is withheld and you may owe a balance at tax time.
When you start a new job in Canada, your employer asks you to complete a TD1 form. Many people sign it without a second thought, accepting the basic personal amount and moving on. But the TD1 is worth reading carefully, because the credits you claim on it directly shape how much income tax comes off each paycheque.
There are two TD1s: the federal TD1 (administered by the CRA) and a matching provincial TD1 for the province where you work. Both affect your withholding. This page explains what the form is, how each credit works in plain English, and when you should update your TD1 to reflect a change in your life circumstances.
What this page helps you check
- Did you complete both the federal TD1 and your province's TD1 when you started your current job?
- Is the basic personal amount (Line 1) correctly shown on your federal and provincial TD1s?
- If you have additional credits (age, disability, caregiver, tuition transfer, etc.) have you claimed them?
- Has anything changed since your last TD1 — marital status, new dependants, eligibility for a disability credit, or starting or stopping school?
- If you have multiple jobs simultaneously, have you only claimed credits on one TD1 (to avoid under-withholding)?
- If your net income for the year will exceed the threshold where the basic personal amount starts to phase down, are your withholdings appropriate?
- Did you complete a new TD1 after a significant life event such as retirement, a marriage, or the birth of a child?
What Is the TD1 and Why Does It Exist?
Canada's income tax system uses a system of non-refundable tax credits to recognise that not all income should be taxed equally — a person supporting a disabled dependent, for example, has different circumstances from a single person with no dependants. Rather than taxing everyone the same and adjusting only at year-end, the TD1 allows employers to account for these credits throughout the year and withhold a more accurate amount of tax each pay period.
The basic personal amount — available to every Canadian resident — is the cornerstone of the TD1. It means the first portion of your income is effectively shielded from tax. Additional credits layer on top of that base, further reducing the amount of tax withheld.
Federal TD1 vs Provincial TD1
The federal TD1 covers federal income tax withholding only. Each province and territory has its own version of the TD1 (for example, the TD1ON for Ontario, TD1BC for British Columbia, TD1AB for Alberta) that covers provincial income tax withholding. Your employer must apply both forms to calculate the total income tax withheld from your pay.
The credit amounts on the federal and provincial TD1s differ, because federal and provincial basic personal amounts and credit values are set independently. You complete both forms together when you start a job and update both if your situation changes.
Common TD1 Credits Explained
Basic personal amount (Line 1): The largest credit for most Canadians. It represents the minimum income threshold below which no federal tax is owed. Everyone with Canadian-source employment income claims this.
Age amount (Line 2): Available to individuals aged 65 or older as of December 31 of the tax year. The value phases out at higher income levels.
Pension income amount (Line 4): For individuals who receive eligible pension income, up to a modest maximum — often relevant to retirees with employer pension income.
Disability amount (Lines 3 and 8): Available to individuals with a severe and prolonged impairment in physical or mental functions, as certified on a T2201 form. A supporting person may be able to transfer unused portions.
Tuition amount (Line 6): Full-time post-secondary students can claim eligible tuition fees. Unused amounts can be transferred to a parent, grandparent, or spouse under specific rules.
Spousal or common-law partner amount (Line 5): If your spouse or partner has little or no income, you may be able to claim their basic personal amount, effectively transferring unused credit to your own return.
Dependant caregiver amounts (Lines 9–12): Various credits exist for supporting infirm adult dependants, children under 18, or other family members in your household.
When to Update Your TD1
You are not required to file a new TD1 every year — the one on file continues to apply until you change it. However, you should update your TD1 whenever your situation changes in a way that affects your credits. Common triggers include: turning 65, having a child or gaining a new dependant, a family member being approved for the disability tax credit, completing your studies (tuition credit no longer applicable), or your spouse returning to work (spousal amount no longer claimable).
If you fail to update your TD1 to remove credits you are no longer entitled to, your employer will withhold less tax than you actually owe, and you will face a balance owing at tax time. Conversely, if you forget to add a new credit, you will over-pay tax during the year and receive a larger refund — not harmful, but less efficient.
You can also use the TD1 to request additional tax withheld beyond what is calculated from your credits. This is useful if you have other income sources (investment income, rental income, a second job) that are not subject to employer withholding and you want to avoid installment payments.
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.
You claimed credits on multiple TD1s for multiple simultaneous jobs
Non-refundable tax credits can only be claimed once across all income sources. If you claimed the basic personal amount with two employers at the same time, each employer withholds less tax, likely resulting in a balance owing when you file.
Your TD1 is outdated and no longer reflects your situation
If a credit you claimed no longer applies (for example, a child has grown up, or your spouse is now working), the employer is still withholding based on the old TD1. You may owe a balance at tax time.
You are entitled to credits you have not claimed
Not claiming a credit you are legally entitled to means extra tax is withheld all year, resulting in a larger refund but lower cash flow throughout the year. Review available credits annually.
The provincial TD1 form was not completed
Some employees complete only the federal form and skip the provincial one. Missing the provincial TD1 can result in incorrect provincial tax withholding, potentially over- or under-withholding depending on your province's default assumptions.
You claimed the disability amount without a valid T2201 on file
The disability tax credit requires CRA approval of a T2201 Disability Tax Credit Certificate. Claiming it on the TD1 without approval means your withholding is based on a credit you may not be entitled to.
You requested additional withholding but it was not applied
If you asked your employer to withhold extra tax each pay period (using the additional withholding field on the TD1) and it does not appear on your pay stubs, follow up with payroll to confirm it was set up correctly.
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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.
- “Can you confirm that both my federal TD1 and my provincial TD1 are on file and that all credits are correctly applied to my withholding?”
- “I need to update my TD1 — what is the process and how quickly will the change take effect on my paycheques?”
- “I want to request additional income tax be withheld each period — how do I submit that instruction and will it appear on my pay stub?”
- “My provincial TD1 was apparently never submitted — can we correct that and recalculate withholding going forward?”
- “I am now 65 — should I submit a new TD1 to claim the age amount, and will that reduce my monthly withholding?”
- “I have a second part-time job — how should I handle the TD1 to ensure I am not under-withholding between both employers?”
Frequently asked questions
Do I have to submit a new TD1 every year?
No. Your TD1 remains on file with your employer indefinitely until you update it. You should update it when your credit situation changes, but there is no obligation to refile annually if nothing has changed.
What happens if I do not submit a TD1 at all?
If you do not submit a TD1, your employer is required to withhold tax as if you are only claiming the basic personal amount. This is the default minimum — you will not lose the basic personal amount, but you will not receive the benefit of any additional credits until you submit the form.
Can I claim more than the maximum on my TD1 to reduce withholding?
No. You can only claim amounts you are legally entitled to. Overclaiming credits on a TD1 is not permitted. If you want less tax withheld for legitimate reasons (for example, you expect significant RRSP contributions), there is a separate process — you can apply to the CRA for a Letter of Authority, which authorises your employer to reduce withholding.
I have two part-time jobs — which employer do I give my credits to?
You should claim your personal credits with the employer who pays you the most. With your other employer(s), you should check the box indicating you have other employment income and that you do not want to claim credits — this ensures the second employer withholds at a higher rate and avoids a balance owing.
Does the TD1 affect CPP or EI deductions?
No. The TD1 only affects income tax withholding. CPP and EI contributions are calculated based on your insurable/pensionable earnings and are not influenced by the TD1.
Where can I get a current TD1 form?
Current federal and provincial TD1 forms are available on the CRA website (canada.ca/cra). Provincial and territorial forms are also there — make sure you download the form for the correct tax year, as the credit amounts are updated annually.
If I owe a balance at tax time, does that mean my TD1 was wrong?
Not necessarily. You could owe a balance because of income from other sources (investments, freelance work) that was not subject to employer withholding, because you incorrectly claimed credits on two TD1s simultaneously, or because year-end adjustments reduced your expected credits. Review your return to identify the source before assuming a TD1 error.
Can I request a copy of my TD1 from my employer?
Yes. You have the right to request a copy of documents you signed with your employer. Contact HR or payroll to obtain a copy of your current TD1 on file.
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.
- TD1 personal tax credits returns — Canada Revenue Agency
- Guide T4127, Payroll Deductions Formulas — Canada Revenue Agency
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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.