TD1

TD1 is the Canadian payroll form employees complete so payroll can determine personal tax-credit information used for income tax withholding.

In plain payroll terms, the form helps payroll decide how much income tax to withhold from pay. It is not a pay stub, not a year-end slip, and not a record of what the employee already paid. It is an input into payroll withholding.

Why TD1 Matters

TD1 matters because it affects:

• income tax withholding during payroll runs
• new-hire payroll setup
• payroll updates when the employee’s situation changes
• the distinction between payroll input forms and payroll results

It is especially important because employees often notice tax withholding amounts on the pay stub before they understand the form that helped payroll calculate them.

How It Works In Canada

When an employee starts employment or has a relevant change, payroll may need updated TD1 information. Payroll uses the information from the form when applying income-tax withholding logic for the employee.

That means TD1 is best understood as:

• an employee-supplied payroll input
• closely connected to income tax withholding
• different from the pay stub that shows the result
• different from the T4 that summarizes the year

In Quebec context, payroll may also need separate provincial forms in addition to the federal TD1 process, so the broader payroll picture can be more than one form.

Example

A new employee completes the TD1 during onboarding. Payroll uses the form together with the employee’s pay frequency and taxable remuneration to determine how income tax should be withheld on the employee’s first paycheque. If the employee’s claim situation changes later, payroll may need a new TD1 to update future withholding.

Common Misunderstandings

• TD1 is not the same as the pay stub. One is an input form and the other is the payroll result.
• TD1 is not the same as the T4. TD1 helps payroll with withholding; T4 summarizes year-end reporting.
• TD1 is not only for the first day on the job forever. Payroll may need an updated form when the employee’s situation changes.
• TD1 is not only a bookkeeping form with no payroll effect. It directly affects withholding logic.

Related Terms

• Source Deductions
• Income Tax Deduction
• Federal Income Tax Deduction
• Provincial Income Tax Deduction
• CRA Payroll Deductions Calculator
• Quebec Income Tax Withholding
• Pay Stub
• Federal Tax Tables

Knowledge Check

1. Does TD1 help payroll determine income tax withholding? Yes.
2. Is TD1 the same as the year-end T4 slip? No.
3. Can Quebec payroll involve additional provincial-form context beyond the federal TD1 process? Yes.

Caveat

Current form versions and filing details can change. This page explains the payroll role of TD1, but current official CRA and Quebec guidance should be used when a live payroll case depends on the latest form requirements.