T4 Is Not Displaying the Expected Amounts or Reporting in the Wrong T4 Box

How to Review and Correct Pay Component Subtype (PCST) Configuration

If your T4 does not display the expected amounts, shows earnings in the wrong T4 boxes, or is missing amounts entirely, the issue is most commonly related to Pay Component Subtype (PCST) configuration.

As outlined in the 2025 Payroll Year-End and 2026 Year-End Preparation Guides, payroll administrators should review PCST attributes before starting the End-of-Year (EOY) process to avoid rework and reporting discrepancies.

When to Use This Guide

Use this guide if:

• An earning or benefit does not appear on the T4

• An amount appears in the wrong T4 box

• Taxable income, CPP, or EI totals are incorrect

• You are validating setup before creating the EOY Summary

Step-by-Step Validation and Correction Process

Step	Instructions	Screenshots
1	Run the T4 PCST Validation Report Before starting EOY, run the PR-CA EOY T4 PCST EE Validation report to identify mapping issues early. Path (Payroll Administrator): Payroll Setup → Saved Searches → PR-CA EOY T4 PSD EE Validation   Alternative Path: Via Global Search → PR–CA EOY T4 PSD EE validation
2	Confirm Amounts via T4 Mapping View Confirm exactly how amounts are currently landing on the T4.
3	Access PCST Configuration If an issue is found, navigate to the specific earning or benefit setup to adjust it. Path: Payroll → Payroll Setup → Pay Component Subtypes (PCST)
4	Review and Adjust Attributes  Edit the PCST to confirm: Taxable Status: Ensures inclusion in taxable income.  CPP/EI Attributes: Affects pensionable and insurable totals.   Reporting Section: Defines the specific T4 Box mapping.
5	Save and Re-Validate Results After adjusting the PCST configuration, save your changes and re-run the validation report to ensure the data is now reporting correctly. 1. Save the PCST record. 2. Return to the PR-CA EOY T4 PCST EE Validation report. 3. Refresh or re-run the search to see updated amounts in the correct T4 boxes.

⚠️ Critical Year-End Warnings

PCST Changes Do NOT Recalculate Payroll

Changes made at year-end affect T4 reporting only. They do not retroactively recalculate Income Tax, CPP, or EI premiums for paychecks already processed.

Important: Earnings That Report to Two T4 Boxes

Some earnings (like Commissions or Taxable Benefits) must report to Box 14 AND a secondary box (e.g., Box 40 or 42).

• Action: Select only the secondary box in the PCST.

• The system automatically includes these amounts in Box 14 by selecting the secondary box. 

If the earning should report to...	You only select this in PCST:	The system automatically includes it in:
Commissions	Box 42	Box 14
Other Taxable Benefits	Box 40	Box 14

If an EOY Summary Has Already Been Created

If you have already finalized your summary and need to make changes:

1. Submit a support case requesting deletion of the EOY Summary.

2. Once confirmed, restart the EOY process to pull in the updated PCST configurations.

Next Steps

You are now ready to start or restart the End-of-Year (EOY) T4 process. Proceed with the EOY steps to:

• Create a new EOY Summary.

• Review final T4 data and outputs.

• Validate totals and box reporting.

• Continue with filing and distribution.