# What is T4 slip?

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A Canadian tax form summarizing employment income and statutory deductions paid to each employee in a calendar year, filed with the Canada Revenue Agency.

A T4 slip, formally called a Statement of Remuneration Paid, is the standardized Canadian tax form that records all employment income paid to a worker during a calendar year, along with statutory deductions such as income tax withheld, Canada Pension Plan contributions, and Employment Insurance premiums. The employer prepares one slip per employee and submits copies to both the employee and the Canada Revenue Agency by a fixed date early in the following year. Employees use the slip to file their personal tax returns, and the agency uses it to verify that remittances from the employer match what was actually paid.
In practice, a payroll team closing out the Canadian year will gather every pay run, tally each box on the slip, confirm the province of employment for each worker, and then distribute slips before the filing deadline. A remote worker based in one province but employed by a company whose nearest office is in another province, for example, may require additional review to ensure the correct provincial tax codes appear on the form.

## How does t4 slip work?

The employer, or a payroll provider acting on the employer's behalf, calculates the figures for each numbered box from the payroll records accumulated across the year. Box 14 captures total employment income before deductions, covering salary, wages, bonuses, commissions, and most taxable benefits. Separate boxes record each statutory deduction, and Box 10 records the province of employment, which determines which provincial income tax rates apply. Once the slips are finalized, the employer files a T4 Summary with the Canada Revenue Agency alongside the individual slips. Workers in Quebec also receive an RL-1 slip filed separately with Revenu Quebec, making Quebec operations a two-agency obligation.
When a payroll provider or Employer of Record manages Canadian payroll, the provider typically owns the preparation, filing, and distribution of T4 slips under its own registered business number. If a company changes providers partway through the year, each provider issues a slip covering the period it administered, and the employee receives two valid slips for that year, both of which must be filed. For companies considering the Employer of Record model for Canadian hiring, EOR Overview explains how that arrangement shifts the legal employer relationship.

## Why it matters for global payroll

For a payroll team already managing payrolls in several countries, Canada adds a jurisdiction with its own year-end slip family, its own filing agency, and a province-level layer that has no direct equivalent in most other payroll systems. A worker who relocates between Canadian provinces during the year, or who works remotely with no fixed office, can complicate the province-of-employment determination and affect which tax rates were applied throughout the year. Getting that field wrong cascades into incorrect provincial tax withholding, which the Canada Revenue Agency will identify when it reconciles the slips against remittances. Payroll teams new to Canada often underestimate that the T4 obligation applies equally to foreign-owned businesses with Canadian workers, with no exemption based on company size or headquarters location.

## Common mistakes

- Issuing a T4A slip instead of a T4 for a worker later reclassified as an employee triggers back-remittances for pension and insurance contributions, plus interest, because the T4A signals self-employed status to the Canada Revenue Agency.
- Forgetting the RL-1 obligation for Quebec workers means the employer has met only the federal filing requirement while leaving a separate provincial filing outstanding with Revenu Quebec.
- Entering the wrong province of employment in Box 10 causes incorrect provincial tax amounts across the entire year, requiring amended slips and potentially a revised remittance calculation.
- Assuming the T4 deadline shifts automatically when a provider changes is a common error; each entity that acted as employer during the year must file its own slips covering its own period, and that responsibility does not transfer to the incoming provider.

## Related terms

- https://payrolloverview.com/learn/worker-classification/
- https://payrolloverview.com/learn/payroll-compliance/
- https://payrolloverview.com/learn/permanent-establishment/
- https://payrolloverview.com/learn/employer-of-record/