Skip to main content
TaxDesk
Menu

CRA notices explained

PIER review

CRA’s annual check that the CPP and EI reported on T4 slips match what the employees’ earnings required.

Payroll

A plain explanation of a common CRA letter, checked against the Act and CRA’s own guidance.

4 min readUpdated October 4, 2026

The short version

Use these three points first.

01

CRA compares required CPP and EI with what the T4 slips report.

02

You have 30 calendar days to reply if you disagree.

03

With no reply or full payment, CRA issues an assessment on day 45.

In this guide

What it is

Every year, CRA reviews T4 slips to check that the CPP and EI amounts calculated from each employee’s pensionable and insurable earnings match the CPP and EI reported on the slip. A PIER package tells you where they don’t.

What to check

Dates that matter

Replying
You have 30 calendar days from the initial PIER package to reply. You don’t need to reply if you agree and remit the exact amount shown by the deadline.
If nothing happens
If there is no reply or full payment, CRA issues a notice of assessment on day 45 and amended T4 slips by day 65.

What to keep

  • The PIER package and your reply
  • Payroll records for each employee flagged
  • Proof of payment, or the corrected information you sent

In TaxDesk

TaxDesk recognizes a PIER review as a payroll notice and files it with the company. To track the reply, record it as a review matter with its response date, and Compliance Radar flags it as the date approaches.

See every CRA notice explained

Scope note. This page explains a CRA letter in general terms. It isn’t advice about your situation. Check the letter itself, and confirm the dates and your options with your accountant.

Primary reading

Official starting points used to develop and check this guide.

  1. 01Pensionable and insurable earnings review (PIER)Canada Revenue Agency

Continue the workflow

The next useful step

Put the guide into practice

Keep every CRA letter with the record it affects.

TaxDesk reads CRA notices, files them to the right company and year, and keeps them beside the filings and audit matters they relate to.