Tax Basics

ITIN & SSN: Still Can't Tell Them Apart?

Many people still confuse ITIN and SSN, which causes plenty of trouble at US tax time. Let's settle the differences once and for all.

✓ITIN is not SSN. The SSN is the identity number of US local residents, while the ITIN is for people who can't get an SSN but need to file US taxes. The two cannot coexist — if you move to the US for work or life and receive an SSN, you should proactively cancel your ITIN.
✓ITIN has a limited scope. It mainly serves people who cannot obtain an SSN — such as non-resident aliens, US residents living abroad, and foreign spouses. Ordinary US residents generally don't need to apply for an ITIN.
✓ITIN can't be used for work. Want to work legally in the US with an ITIN? No. The ITIN is only a tax tool, used for filing returns and claiming refunds.
✓ITIN is not identity proof. Don't treat an ITIN as an identity document — it can't verify who you are. It's for taxes, period.
✓ITIN needs to be kept current. An ITIN expires after three consecutive years of non-use. Get into the habit of filing every year — it keeps your number alive and reduces your tax risk.

Remember: file on time and there is no risk. Not sure how to file or whether you even need an ITIN? We can help you apply for an ITIN tax number online and answer your questions along the way.

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