Tax Identification Number

A Tax Identification Number, usually shortened to TIN, is the code a country’s tax authority assigns to identify you. It links your earnings, filings, and payments to one person. Almost every country has one, but the name changes: the US calls it an SSN or ITIN, Spain uses the NIE/NIF, Italy the codice fiscale, and the UK leans on a National Insurance number and a Unique Taxpayer Reference.

When you relocate, the TIN is usually the first official key you need. Without it you often can’t sign an employment contract, register as self-employed, open a local bank account, or even take on a lease. Plenty of countries issue one to non-residents too, so getting it early often makes more sense than waiting until you’ve settled in.

The catch most people miss: holding a TIN isn’t the same as being a tax resident. A number ties you to the system; residency rules decide where you actually owe tax. You can hold TINs in several countries at once, which is normal for nomads who keep ties back home. When you apply, you may be asked for documents that need to be legalised with an apostille, and the number can show up later when you set up an IBAN account. Our relocation wizard can map which one you’ll need first.

This is general information, not advice — tax rules vary widely by country and change often, so confirm the details with the official tax authority or a qualified professional before you act.

Where you’ll meet this

• Opening a local bank account, where the branch asks for your TIN before they’ll proceed.
• Starting a job or registering as self-employed, when payroll or the tax office needs the number on file.
• Filing your first local tax return, where the TIN identifies you and links your declared income.