T4 · Statement of Remuneration Paid
T4 box 12: social insurance number
Your employer issues a T4 for every job you had during the year, by the end of February.
- What it is
- Your nine-digit SIN. Check it's right: a wrong SIN means the CRA can't match the slip to your return.
- Where it goes on your return
- Nothing to enter. If it's wrong, ask your employer for an amended T4.
- Never share a photo of your T4 online without hiding this box.
See your refund from your T4
Drop your T4 PDF into the free Tax Slip Reader. It reads every box and estimates your refund in seconds, right in your browser. Nothing is uploaded.
Open the Tax Slip ReaderFrequently asked questions
What is T4 box 12 on my T4?
T4 box 12 is social insurance number. Your nine-digit SIN. Check it's right: a wrong SIN means the CRA can't match the slip to your return.
Where do I put T4 box 12 on my tax return?
Nothing to enter. If it's wrong, ask your employer for an amended T4.
Other T4 boxes
Source: Canada Revenue Agency, T4 slip. General information, not tax advice.
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