What does “SIN” mean?

Social Insurance Number. Your 9-digit number for work, taxes and benefits.

What to do

Keep it private. Give it only when you must, for example to your employer, your bank or a government office. A SIN that starts with 9 is for temporary residents and has an expiry date.

You may see it in letters from

• Service Canada — Federal benefits office

“SIN” is a English word used in official letters in Canada. Briefly explains words like this automatically when you check a letter.

More office words

UCI · IRCC · biometrics · procedural fairness letter · PR card · COPR · work permit · study permit · all words