T4 Summary — Employer Payroll Return (Canada)

A T4 Summary — Employer Payroll Return in Canada is a legally binding written instrument.S.C. 1985, c. A-1).

The obligation to prepare and file T4 slips and a T4 Summary arises under Section 200(1) of the Income Tax Regulations (C.R.C., c. 945) and Section 228 of the Income Tax Act (R.S.C., 1985, c. 1 (5th Supp.)). Every person who pays remuneration subject to source deductions — including employment income, commissions, taxable benefits, and other amounts reportable under the Act — must file T4 slips for each recipient and submit a T4 Summary to the CRA by the last day of February following the calendar year. For example, T4 slips and the T4 Summary for calendar year 2024 are due February 28, 2025.

The T4 Summary reconciles three categories of source deductions: Canada Pension Plan (CPP) contributions under the Canada Pension Plan Act (R.S.C., 1985, c. C-8), Employment Insurance (EI) premiums under the Employment Insurance Act (S.C. 1996, c. 23), and income tax deductions under the Income Tax Act. For each category, the T4 Summary reports the total employee deductions (Box 16, 18, and 22 respectively across all T4 slips) and the total employer contributions (CPP contributions matched dollar for dollar by the employer; EI premiums multiplied by the employer's EI premium rate factor of 1.4). The sum of employee and employer amounts for each category must match the total remittances made to the CRA's payroll account (RP program account) during the year.

Electronic filing of T4 slips and the T4 Summary is mandatory for employers who issue 6 or more T4 slips in a calendar year, under Section 209(5) of the Income Tax Regulations (effective for the 2023 tax year). Electronic filing is done through the CRA's Internet File Transfer (IFT) service using XML data in the CRA's prescribed format, through My Business Account's File a Return service, or through CRA-certified payroll software such as ADP Workforce Now, Ceridian Dayforce, QuickBooks Payroll, or PaymentEvolution. Employers filing 5 or fewer T4 slips may still use paper forms obtained from the CRA.

The T4 Summary is distinct from the T4 slip in that the slip reports an individual employee's employment income and deductions for the year (given to the employee for their personal T1 return), while the Summary aggregates all slips and reconciles the employer's payroll account with the CRA. Discrepancies between the T4 Summary and the CRA's records of remittances received can result in an employer assessment under Section 227.1 of the Income Tax Act, holding directors personally liable for unremitted source deductions plus interest and penalties. Directors of corporations incorporated under the Canada Business Corporations Act (R.S.C. 1985, c. C-44) or provincial Business Corporations Acts face this personal liability unless they exercised the due diligence defence established in Soper v. Canada (1997) 97 DTC 5407 (FCA).

Electronic filing of T4 slips and the T4 Summary uses the CRA's Internet File Transfer (IFT) XML service, and the XML schema must conform to the CRA's T4 Slip Information Return specification published annually. Payroll software certified by the CRA — including ADP Workforce Now, Ceridian Dayforce, QuickBooks Payroll, and PaymentEvolution — automates this process. The CRA's My Business Account portal and the Represent a Client service (for authorized representatives holding an RC59 Business Consent authorization) provide secure online access. The Canada Pension Plan Act (R.S.C. 1985, c. C-8) and Employment Insurance Act (S.C. 1996, c. 23) set the contribution and premium rates that determine Box 16 and Box 18 totals. The Income Tax Regulations (C.R.C., c. 945), specifically Section 200(1) and Section 209(5), govern T4 filing obligations. Objections to T4-related assessments are filed under Section 165 of the Income Tax Act, with appeals to the Tax Court of Canada under the Tax Court of Canada Act (R.S.C. 1985, c. T-2). Forms-legal.com provides this T4 Summary — Employer Payroll Return (Canada) template covering the mandatory elements under Section 200(1) of the Income Tax Regulations.

A Canadian T4 Summary is needed by every Canadian employer — federal, provincial, and private sector — that paid employment income subject to source deductions to one or more employees during a calendar year, regardless of the amount paid or the number of employees.

Small businesses with even one part-time employee — for example, a sole proprietor who hired a student assistant for summer work — must issue a T4 slip to that employee and file a T4 Summary with the CRA by February 28 of the following year. There is no de minimis threshold: even a single T4 slip triggers the Summary filing obligation.

Incorporated business owners who pay themselves a salary from their corporation need T4 slips issued to themselves as employees of the corporation, and the corporation must file a T4 Summary reconciling the salary paid, CPP contributions, and income tax withheld. This is distinct from dividend payments, which are reported on T5 slips rather than T4 slips.

Payroll service bureaus — including ADP Canada, Ceridian, and smaller regional payroll providers — file T4 slips and T4 Summaries on behalf of their client employers. Each client employer is responsible for the accuracy of the information reported, even where the payroll bureau prepares and files the documents; the employer's CRA payroll account (RP) remains the accountable entity.

Employers who discover during year-end payroll processing that they made errors in source deductions — such as under-remitting CPP contributions because of an incorrect employee exemption, or failing to withhold income tax on taxable benefits — need to correct the error before filing the T4 Summary. Underpayments discovered before the February 28 filing deadline can often be corrected through a supplementary remittance; errors discovered after filing require amended T4 slips and an amended T4 Summary.

New employers who hired their first employee mid-year need to file a T4 Summary for the period from the employee's hire date to December 31, covering all amounts paid and deducted, even if the employee worked only a few months. The CRA automatically opens a payroll deductions account (RP) when an employer registers for payroll, and the RP account requires annual reconciliation through the T4 Summary process.

Section 153 of the Income Tax Act (R.S.C., 1985, c. 1 (5th Supp.)) requires employers to withhold and remit income tax, CPP contributions under Section 8 of the Canada Pension Plan Act (R.S.C. 1985, c. C-8), and EI premiums under Section 82 of the Employment Insurance Act (S.C. 1996, c. 23). Section 227 of the Income Tax Act governs the liability of employers who fail to withhold, and Section 227.1 imposes personal liability on directors for unremitted source deductions. Section 228 requires filing information returns including T4 slips and the T4 Summary. Section 239 makes false certification of information returns an offence carrying fines up to $25,000. Section 165 of the Income Tax Act governs formal objections to CRA assessments, with appeals to the Tax Court of Canada under the Tax Court of Canada Act (R.S.C. 1985, c. T-2). Section 200(1) of the Income Tax Regulations (C.R.C., c. 945) establishes the T4 filing deadline (February 28); Section 209(5) mandates electronic filing for employers issuing 6 or more slips. Section 8(1)(i) of the Income Tax Act governs union dues and RPP deduction claims that appear on T4 Box 44 and Box 52. The Canada Revenue Agency Act (S.C. 1999, c. 17) establishes CRA's authority to administer payroll source deductions. Forms-legal.com provides this T4 Summary — Employer Payroll Return (Canada) template for annual payroll reconciliation under the Income Tax Act.

A complete Canadian T4 Summary — Employer Payroll Return contains specific totals, reconciliation lines, and certification required by the CRA to verify that an employer's source deductions for the year have been correctly withheld and remitted.

The employer identification section records the employer's legal name (as registered with the CRA), Business Number (BN), payroll account number (RP program account, e.g., 123456789 RP0001), mailing address, and the calendar year covered by the Summary. The payroll account number links the Summary to the employer's CRA payroll remittance history for reconciliation purposes.

The total number of T4 slips line (Box 88) records the number of T4 slips filed with this T4 Summary. This count must equal the number of individual T4 slips submitted to the CRA as part of the same filing. Discrepancies between the slip count and the slips actually received by the CRA flag potential data transmission errors in electronic filings.

Box 14 — Total employment income is the sum of all amounts reported in Box 14 on all individual T4 slips — the gross employment income (wages, salaries, commissions, bonuses, and most taxable benefits) paid to all employees during the year before source deductions. This total is used by the CRA to cross-reference payroll data against the employer's income tax return (T2 or T1) to verify that all wages deducted as business expenses are reported as employee income.

Box 16 — Total CPP contributions is the sum of all employee CPP contributions shown in Box 16 on individual T4 slips. The employer must match the total employee CPP1 contributions dollar for dollar (employer CPP1 contribution) and add the employer CPP2 contribution on earnings between the Year's Maximum Pensionable Earnings ($68,500) and the Year's Additional Maximum Pensionable Earnings ($73,200) for 2024. Both employee and employer CPP contributions are remitted to the CRA under the Canada Pension Plan Act.

Box 18 — Total EI premiums is the sum of all employee EI premiums shown in Box 18 on individual T4 slips. The employer's share of EI premiums is 1.4 times the employee's total EI premiums (the employer EI premium multiplier set by the Employment Insurance Act). Quebec employers pay a reduced employer EI premium multiplier of 1.4 times the reduced Quebec EI rate, because Quebec administers its own Quebec Parental Insurance Plan (QPIP) separately through the QPIP Act.

Box 22 — Total income tax deducted is the sum of all federal and provincial income tax withheld from employee pay during the year, as shown in Box 22 on all individual T4 slips. This amount must reconcile with the total income tax remittances made to the CRA's payroll account during the year. The CRA provides each employer with a Statement of Account for Source Deductions (PD7A) that records remittances received, enabling the reconciliation.

The remittance reconciliation section compares total source deductions reported on the T4 Summary (CPP employee contributions + CPP employer contributions + EI employee premiums + EI employer premiums + income tax deducted) against total remittances recorded in the CRA's payroll account for the year. Any balance owing must be remitted with the T4 Summary filing; any overpayment triggers a credit in the CRA payroll account or a refund on request.

The certification section requires an authorized signing officer of the employer — a director, officer, or sole proprietor — to certify the accuracy and completeness of the T4 Summary and all attached T4 slips. For corporate employers incorporated under the Canada Business Corporations Act (R.S.C. 1985, c. C-44) or provincial Business Corporations Acts, the signing officer's authority should be confirmed by a corporate resolution or the corporation's signing authority policy. False certification of a T4 Summary is an offence under Section 239 of the Income Tax Act (R.S.C., 1985, c. 1 (5th Supp.)), carrying fines of up to $25,000 and potential imprisonment.

Additional T4 reporting boxes address specialized compensation: Box 40 (other taxable allowances and benefits), Box 44 (union dues), Box 46 (charitable donations), Box 50 (RPP or DPSP registration number), Box 52 (pension adjustment for members of Registered Pension Plans regulated by the Office of the Superintendent of Financial Institutions under the Pension Benefits Standards Act, 1985, R.S.C. 1985, c. 32 (2nd Supp.)), and Box 66/67 (eligible and non-eligible retiring allowances). Quebec employees also receive RL-1 slips issued under Revenu Québec's provincial rules under the Taxation Act (R.L.R.Q., c. I-3). The CRA's Payroll Deductions Online Calculator (PDOC) and guide T4032 (Payroll Deductions Tables) assist employers in computing correct withholdings. Employers disputing source deduction assessments may object under Section 165 of the Income Tax Act, with appeals to the Tax Court of Canada under the Tax Court of Canada Act (R.S.C. 1985, c. T-2). Section 227.1 of the Income Tax Act imposes director liability for unremitted source deductions. Section 153 of the Income Tax Act requires employers to withhold and remit source deductions. Forms-legal.com provides this T4 Summary — Employer Payroll Return (Canada) template covering the mandatory elements under Section 200(1) of the Income Tax Regulations (C.R.C., c. 945).