Learn About Getting a TIN Number for Individuals and Businesses

What Is a Tax Identification Number (TIN)?

A Tax Identification Number, or TIN, is a nine-digit code that the Internal Revenue Service (IRS) uses to identify individuals and businesses for tax purposes. Think of it as a social security number for tax matters. The format looks like this: XX-XXXXXXX, with dashes separating the digits into three groups.

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The IRS issues different types of TINs depending on who you are and what kind of work you do. For individuals, the most common TIN is a Social Security Number (SSN). For businesses, it's an Employer Identification Number (EIN). There are also other types of TINs for specific situations, such as Individual Taxpayer Identification Numbers (ITINs) for people who don't have a Social Security Number.

According to IRS data, over 330 million TINs have been issued in the United States. Whether you're working as an employee, starting a business, or working as an independent contractor, you'll likely need a TIN to file taxes, open a bank account, or apply for credit. Without one, you cannot legally report income to the government or file a tax return.

Understanding what a TIN is and why you need one is the first step in managing your tax obligations. Your TIN connects all your tax records to your name and personal information, making it easier for the IRS to track income, deductions, and payments over your lifetime.

Practical Takeaway: A TIN is your tax identity number. Individuals typically use Social Security Numbers, while businesses use Employer Identification Numbers. Knowing which type you need is essential before you proceed with obtaining one.

Types of TINs: SSN, EIN, ITIN, and Others

There are several different types of Tax Identification Numbers, each designed for different situations. Understanding which type applies to you is important because applying for the wrong one can cause delays and confusion.

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A Social Security Number (SSN) is the most common TIN. The Social Security Administration issues SSNs to U.S. citizens, permanent residents, and certain temporary residents. If you were born in the United States, you likely already have an SSN. Over 453 million SSNs have been issued since the program began in 1936. You use your SSN to report wages from employment, self-employment income, and other earnings. You also use it when filing personal tax returns.

An Employer Identification Number (EIN) is used by businesses, organizations, and certain individuals who work as independent contractors or have employees. The IRS issues EINs to sole proprietors, partnerships, corporations, nonprofits, and other business entities. An EIN is necessary if you plan to hire employees, operate as a corporation or partnership, or if you want to establish a business bank account. Many self-employed people choose to get an EIN even if they don't have employees, to keep their business finances separate from personal finances.

An Individual Taxpayer Identification Number (ITIN) is issued to individuals who don't have a Social Security Number but need to file taxes or report income. ITINs are typically given to nonresident aliens, resident aliens, spouses, and dependent family members. The ITIN looks like a regular SSN but starts with the number 9. Since 2011, over 17 million ITINs have been issued.

There are also specialized TINs for specific situations. For example, an Adoption Taxpayer Identification Number (ATIN) is a temporary number used for children in the adoption process before they receive a Social Security Number. A Preparer Tax Identification Number (PTIN) is used by tax professionals who prepare tax returns for others.

Practical Takeaway: Match your situation to the correct TIN type. Employees and individuals use SSNs. Businesses and self-employed people typically need an EIN. People without SSNs who need to file taxes may need an ITIN. Choosing the right type from the start saves time and prevents problems.

How to Obtain a Social Security Number

If you don't have a Social Security Number, the Social Security Administration (SSA) issues them at local Social Security offices. The process is straightforward and designed to be accessible to eligible individuals.

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To request an SSN, you need to visit your local Social Security office in person. You cannot obtain an SSN entirely by mail or online. When you go to the office, bring documents that prove your identity, your age, and your citizenship or immigration status. Acceptable documents for identity include a birth certificate, driver's license, passport, or state-issued identification card. For citizenship, you may provide a U.S. birth certificate, passport, naturalization papers, or immigration documents.

The Social Security Administration does not charge a fee to issue an SSN. The process typically takes 10-14 business days. The SSA will mail your Social Security card to the address you provide. In some cases, if you're a newborn and the hospital participates in the SSA's Enumeration at Birth program, your parents can arrange an SSN while they're still at the hospital.

If you already have an SSN but lost your card or need a replacement, you can request a new card by mail or in person at a local Social Security office. You can order a replacement online at ssa.gov if you have a "my Social Security" account. Replacement cards are also free and typically arrive within one to two weeks.

According to the Social Security Administration, as of 2023, about 440 million SSNs are currently in use. The number of new SSNs issued each year varies, but typically ranges from 5 to 6 million, with peaks during years with higher birth rates or increased immigration.

If you're a U.S. resident who doesn't yet have an SSN, obtaining one should be one of your first steps. Many institutions—banks, employers, and insurance companies—require an SSN to open accounts or process paperwork. Having one opens up many opportunities and makes it easier to establish your presence in the U.S. financial system.

Practical Takeaway: Visit your local Social Security office with proof of identity, age, and citizenship. Bring original documents or certified copies. The process is free and takes 10-14 business days. Plan ahead if you need your SSN quickly.

How to Obtain an Employer Identification Number (EIN)

An Employer Identification Number is the federal tax ID for businesses and organizations. Unlike Social Security Numbers, you can obtain an EIN through multiple methods, including online, by phone, by fax, or by mail. This flexibility makes getting an EIN faster and more convenient than getting an SSN.

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The fastest way to obtain an EIN is online through the IRS website at irs.gov. The IRS's online EIN application tool allows you to receive your number immediately after you submit your information. The entire process takes about 15 minutes. You do not need to pay a fee—the IRS does not charge for EINs.

To apply online, you need to provide basic information about your business, including the business name, business type (sole proprietorship, partnership, corporation, LLC, nonprofit, etc.), the address where the business operates, the reason you're requesting the EIN (hiring employees, opening a bank account, establishing a trust, etc.), and the name and Social Security Number of the business owner or responsible party.

If you prefer not to apply online, you have other options. You can call the IRS at 1-800-829-4933 and speak with a representative who can take your information over the phone. Applications by phone may take 10 business days to process. You can also fax Form SS-4 (the EIN application form) to the IRS or mail it. Mailed applications typically take 4-6 weeks.

The IRS issued 1.8 million EINs in 2022 alone. About 30 million EINs are currently active in the United States. Most new businesses obtain an EIN within the first few months of operation, often before they hire their first employee or open a business bank account.

You need an EIN if you plan to hire employees, operate as a corporation or partnership, have a business with a separate legal structure from yourself (like an LLC or S-corp), or if your business has employees. You may also want an EIN even as a sole proprietor to keep business and personal finances