Tax Identification Number (TIN)

There are many use cases where a TIN is mandatory. For example:

• For managing credit. Credit reporting agencies use TINs (Social Security Numbers in particular) to track customers’ credit histories.
• For reporting data. Financial institutions require SSNs on credit applications to verify user identities and report information to credit bureaus. 
• For tax filing. Companies need state identification numbers for tax filing with state tax authorities.
• For verifying new hires. Employers require SSNs from applicants to verify they’re legal to work in the US. 

Yes. There are four main types of TINs in the US:

1. Social Security Numbers (SSNs)
2. Individual Taxpayer Identification Numbers (ITINs)
3. Preparer Tax Identification Numbers (PTINs)
4. Employer Identification Numbers (EINs)

A Social Security Number or SSN is an identifier and a type of TIN used by the US government to track citizens’ earnings and work history. People provide SSNs to file taxes and identify themselves to government agencies. The Social Security Administration (SSA) issues SSNs for all US citizens: permanent residents, as well as temporary, working, or non-working residents can obtain an SSN. 

Yes, because sole proprietors (including single-member LLCs) use their SSNs to file business taxes instead of an Employer Identification Number (EIN). In general, if a business works with contractors or has employees, it will need to collect their SSNs for reporting purposes.

An Employer Identification Number or EIN is a unique identifying number assigned by the IRS to businesses for tax purposes. It’s the equivalent of an SSN, but it is applied to businesses.  EINs help identify US companies for tax filing and compliance. Corporations, LLCs, partnerships, and nonprofit organizations can apply for an EIN directly through the IRS and usually receive it right away.

An Individual Taxpayer Identification Number or ITIN is a nine-digit number used for federal tax purposes when individuals aren’t eligible for an SSN. Citizens should file Form W-7 with the IRS to receive an ITIN, but it can take up to seven weeks to have the application processed. Non-resident independent contractors and foreign investors are also eligible to receive an ITIN because they pay US taxes. 

A Preparer Tax Identification Number or PTIN is a unique identifier and a form of TIN designed for professional tax preparers or those who accept payment to prepare tax returns. Certified Public Accountants (CPAs), Enrolled Agents (EAs), tax advisors, and other professionals who file taxes on behalf of their clients are eligible to receive a PTIN, which must be renewed annually. 

TINs are used to ensure accurate record-keeping by matching income declarations with tax forms. This allows the IRS to correctly allocate payments and refunds, including tracking tax activity and ensuring accurate income reporting. The IRS then cross-checks financial institutions’ submitted information to ensure taxpayers accurately report their investment income on their tax returns.