If you do not have a Social Security Number, you can still file and pay U.S. taxes by applying for an Individual Taxpayer Identification Number (ITIN).

To get an ITIN, you must complete IRS Form W-7. This form is usually submitted together with your federal tax return the first time you apply. The IRS uses the ITIN strictly for tax reporting purposes and it does not give you work authorization or immigration status.

You will also need to provide original identity documents or certified copies, most commonly a valid passport. If you do not want to mail your original passport, you can apply through an IRS Certified Acceptance Agent or at certain IRS Taxpayer Assistance Centers that verify documents in person.

Once approved, the IRS will issue your ITIN and you can use it to file your tax return. Processing typically takes several weeks, and you can continue using the ITIN for future tax filings as long as it remains active.