Each with its own unique purpose and function, the Social Security Number (SSN), Individual Taxpayer Identification Number (ITIN), and Employer Identification Number (EIN) are inevitable realities for individuals and businesses in the United States. We know the world filled with these numbers can be confusing, so we've prepared this informative post to unravel this complexity. Join us in understanding what exactly these numbers mean, in what situations they are used, and how you can acquire them. Let's make this complex process more comprehensible and explore the impact of these critical numbers in your life.


ITIN stands for Individual Taxpayer Identification Number in the U.S., operated by the Internal Revenue Service (IRS). ITIN is an identification number for individuals who do not have a work permit in the U.S. but need to make federal tax payments.

ITIN does not provide a work permit; instead, it is used for tax payments and reporting. This number is provided to individuals who do not have a social security number but need to file a tax return due to a job in the U.S. or other sources. This usually includes foreign nationals residing or earning income in the U.S., and other certain circumstances.

ITIN is also essential for foreign owners of Single Member LLCs and foreign nationals who are partners in Multi-Member LLC Partnerships to fulfill their tax obligations. These foreign-owned companies need an ITIN to correctly fill out their tax returns and make payments.

Additionally, some banks and third-party payment systems (such as Stripe, PayPal, etc.) may require users to have an ITIN. This is more frequently seen for users outside the U.S., usually requested to verify tax information.

To get an ITIN, you need to fill out IRS Form W-7 and provide the necessary documents. ITIN is used when needed for filing a tax return and tax calculations, ensuring compliance with federal tax laws. Also, an individual owning an ITIN can benefit from certain tax reductions during their residency in the U.S. An ITIN owner can get an ITIN for a spouse or dependent living in America, and this can be listed among the dependents on a tax return.


EIN (Employer Identification Number) is a number provided to companies by the U.S. Tax Authority (IRS). This number identifies a company and is used during transactions such as tax payments, presenting federal tax returns, and paying social security premiums for employees. The EIN also plays a significant role in a company's interactions with suppliers, financial institutions, and other companies.

There are some situations where a company needs to apply for an EIN:

If your company has employees: A company needs an EIN to pay wages and other compensations to its employees. This applies to federal and state income tax, social security, and Medicare taxes.

If your company is established as a partnership or a limited liability company (LLC): This kind of structure requires an EIN to meet the obligations of submitting a tax return and paying taxes.

If your company has other federal tax obligations: For example, a company selling alcohol, tobacco, or firearms should get an EIN due to the obligation to pay federal tobacco and firearms tax.

However, keep in mind that the only way to get an EIN is not by making an online application. If the company's authorized person does not have an SSN (Social Security Number) or ITIN (Individual Taxpayer Identification Number), it may not be possible to apply online. In this case, the application form can be filled out and faxed or sent by mail. This process can be complex and time-consuming but is important for the company's operations. EIN helps your company meet its tax obligations in the U.S., thus enabling it to continue its business operations in the U.S. Therefore, we recommend getting your EIN as soon as possible. If you lose or forget your EIN, you can retrieve your number by contacting the IRS.


SSN (Social Security Number) is a unique nine-digit identification number given to individuals living in the United States by the American Social Security Administration. This number is issued for every American citizen and permanent resident (green card holders), and it can also be given to certain immigrant statuses.

The SSN facilitates the administration of social security programs in the United States while providing a mechanism to track individuals' incomes and social security contributions. It allows the government to monitor individuals' lifetime earnings and tax obligations.

The importance of an SSN is not limited to social security. It is also required in credit applications, applying for government assistance, filing tax returns, and a range of other financial and government transactions. Financial institutions and credit card companies often do an SSN check before providing credit to individuals because this number is also used to verify a person's identity, along with credit history and other financial information.

Employers also use SSNs, as these numbers provide a tool to verify whether individuals are eligible to work. Foreign workers, depending on their visa statuses and work permits, can get an SSN when they are allowed to work in the U.S.

In conclusion, understanding the critical importance of SSN, ITIN, and EIN in the United States for both individuals and businesses is vital. Each of these numbers simplifies the processes of identity verification and tax payment. However, if you're confused about these complex systems, don't worry. TAM Accounting is at your side with its extensive knowledge and expertise. Whether for personal or business purposes, we can assist you in obtaining and properly using your tax numbers. Visit our website for more information about the services offered by TAM Accounting, or get in touch with us. Remember, with the right information and professional help, you can make tax processes in America easier and stress-free.

Don't hesitate! Take the first step towards a simpler and clearer tax journey by contacting TAM Accounting today. Allow us to be your trusted guide in navigating the complex landscape of US tax systems. We're committed to providing clear, comprehensive tax solutions tailored to your unique needs. So, whether you're a business or an individual, TAM Accounting is here to help. Contact us today to learn more about our services and how we can assist you.

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