Every year, thousands of mortgage brokers, accountants, and HR professionals in Canada manually re-enter data from T4 slips. Box 14, box 22, box 16, box 18 — copied one by one from a PDF into a spreadsheet or loan application.
It's slow, error-prone, and completely unnecessary in 2025.
In this article, I'll show you how to automate T4 extraction in under 10 minutes using a REST API — no OCR libraries, no ML model, no infrastructure to maintain.
What is a T4 Slip?
A T4 (Statement of Remuneration Paid) is a Canadian tax document issued by employers to employees every year. It reports employment income and all payroll deductions to the CRA.
