Year-End T4 Filing: What Canadian Employers Leave Too Late
February 28 looks like a reasonable deadline until you map out everything that has to happen before a T4 slip can be finalised. Payroll reconciliation, benefit adjustments, SIN verification, provincial allocation, and at least one internal review all need to happen first. Employers who treat T4 preparation as a February task almost always run out of time. The ones who get through it cleanly start in November.
On this page
- Why February Feels Earlier Than It Should
- What Goes Wrong Before the Slip Is Even Generated
- Taxable Benefits: The Biggest Source of Late Corrections
- What Gets Missed and Why
- The Timing Problem
- How Multi-Province Payroll Complicates the Filing
- The CRA Penalty Structure
- Per-Slip Penalties Add Up Fast
- Where an Employer of Record Fits In
- What a Clean Year-End Process Actually Looks Like
Why February Feels Earlier Than It Should
Most employers look at the last day of February and think they have time. The CRA requires T4 slips issued to employees and filed with the agency by that date following each calendar year, and on paper that sounds like a comfortable runway. What it doesn’t account for is the reconciliation work that has to happen before a single slip gets generated.
If payroll hasn’t been reviewed month-to-month, December becomes a catch-up exercise across the full year. Discrepancies compound. A missed taxable benefit in April looks like a small fix in isolation, but by December you may have the same error repeated across twelve pay periods for a dozen employees. That’s a very different problem.
What Goes Wrong Before the Slip Is Even Generated
Payroll software doesn’t make T4 filing automatic. It generates slips based on what was recorded throughout the year. Wrong inputs produce wrong outputs. Full stop.
The most common upstream problems are employment codes assigned incorrectly at hire and never corrected, box mismatches where employment income and insurable earnings don’t reconcile with what was actually remitted, employees whose province of employment changed mid-year without a corresponding system update, and retroactive pay or bonuses processed in the wrong period.
None of these are exotic edge cases. They show up regularly, particularly in organisations that rely on payroll software without anyone doing a structured mid-year check.
Taxable Benefits: The Biggest Source of Late Corrections
What Gets Missed and Why
Group life insurance premiums paid by the employer, employer-funded parking, personal use of a company vehicle , all taxable benefits that must be included in T4 income. The CRA is clear on this. In practice, these amounts are frequently missed or underreported, then corrected after the original slips have already gone out.
An amended T4 is not a catastrophe, but it creates extra filing, requires notifying affected employees, and raises the likelihood of a CRA review.
The Timing Problem
The harder issue is that benefit values sometimes aren’t finalised until January, because the insurance carrier hasn’t issued the year-end premium statement yet, or the vehicle log hasn’t come in. Building those deadlines into a November timeline, rather than waiting for the documents to arrive whenever they arrive, is what separates a clean close from a scramble in February.
How Multi-Province Payroll Complicates the Filing
Each T4 slip must reflect the employee’s province of employment, not province of residence. For most domestic employers with staff in one location, this is straightforward. For companies with employees working across provincial borders, or remote workers whose physical location differs from the employer’s registered address, it requires deliberate tracking throughout the year, not a best-guess entry at filing time.
The distinction matters because Canadian payroll obligations vary by province. CPP contribution rates, provincial income tax rates, and certain deductions all differ depending on where the work is performed. An employee who lives in New Brunswick but performs work in Nova Scotia is taxed on Nova Scotia rates. Getting this wrong affects both the employee’s personal return and the employer’s remittance reconciliation. Foreign employers hiring across Canada are particularly exposed here, because provincial employment standards often feel like a secondary concern until a filing error surfaces.
The CRA Penalty Structure
Per-Slip Penalties Add Up Fast
Late or incorrect T4 filing carries per-slip penalties. The CRA calculates based on the number of information returns filed late, starting at $100 for one to five slips and scaling to $7,500 for 500 or more. The penalties apply even if the underlying tax was remitted on time.
Incorrect slips carry a separate penalty of $100 per slip where the error results from carelessness. For a company with 40 employees where 15 slips contain benefit errors, that exposure adds up faster than most payroll managers expect.
Where an Employer of Record Fits In
An employer of record that handles payroll, benefits reporting, and year-end reconciliation as part of a single service can reduce that risk meaningfully. The catch is that it only works if the benefit data the client provides is accurate and complete. The service can’t fix what it never receives.
What a Clean Year-End Process Actually Looks Like
Working backwards from February 28, a practical timeline looks roughly like this:
- November: Run a payroll register audit for the full year. Flag any pay period where taxable benefit amounts were zero or unchanged, as these are the most likely to be missing data.
- Early December: Collect benefit statements from carriers and calculate the taxable portion for each employee. Confirm all vehicle logs are submitted.
- Mid-December: Verify SINs against the T4 information on file. A SIN mismatch is a reportable error and the CRA can assess penalties for it.
- Late December: Reconcile total CPP, EI, and income tax deducted against total remittances for the year. Any gap needs to be resolved before slips are generated.
- January: Generate draft slips and complete an internal review. Amended slips filed in January cost far less, in time and goodwill, than those filed after the deadline.
- February: Final sign-off, distribute slips to employees, file with the CRA.
Most year-end problems trace back to treating T4 preparation as a filing task rather than a reconciliation task. The filing itself takes hours. The reconciliation, done properly, takes weeks, and starting that work in November gives you real time to fix what you find. Starting it in February means you’re filing what you have and hoping for the best.
