Self-Employment Contributions Act (SECA): Self-employed Taxes Explained + Definition

Learn everything you need to know about the Self-Employment Contributions Act (SECA) and gain a clear understanding of self-employed taxes.

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The Self-Employment Contributions Act, commonly referred to as SECA, is a United States federal law that mandates self-employed individuals to pay Social Security and Medicare taxes. This piece of legislation is crucial for those who work for themselves, as it ensures that they contribute to and can benefit from these essential social programs. This article aims to provide a comprehensive understanding of SECA, its implications for self-employed individuals, and how it is calculated and paid.

Unlike employees who share the responsibility of these taxes with their employers, self-employed individuals bear the entire burden under SECA. This can often lead to higher tax liabilities, making it essential for self-employed individuals to understand the nuances of this law. In the following sections, we will delve into the details of SECA, its history, calculation, payment process, and its comparison with the Federal Insurance Contributions Act (FICA).

History of the Self-Employment Contributions Act (SECA)

The Self-Employment Contributions Act was enacted in 1954 as a part of the Social Security Amendments. The primary purpose of this act was to extend Social Security coverage to self-employed individuals. Before SECA, only employees and their employers contributed to Social Security. However, the government recognized the need to provide the same benefits to self-employed individuals, leading to the creation of SECA.

Over the years, SECA has undergone several changes, with the tax rates and income thresholds being adjusted periodically. Despite these changes, the core principle of SECA remains the same - to ensure that self-employed individuals contribute to and are covered by Social Security and Medicare.

Impact of SECA on Self-Employed Individuals

SECA has had a significant impact on self-employed individuals, primarily by ensuring that they are covered by Social Security and Medicare. These programs provide essential benefits such as retirement income, disability income, and health insurance, which are crucial for self-employed individuals who do not have access to employer-sponsored benefits.

However, SECA also means that self-employed individuals have a higher tax burden as they are responsible for the entire Social Security and Medicare tax, unlike employees who share this burden with their employers. This has led to criticisms of SECA, with some arguing that it places an unfair burden on self-employed individuals.

Understanding SECA Taxes

SECA taxes are composed of two parts - Social Security tax and Medicare tax. The Social Security tax is charged on the first $142,800 of net earnings from self-employment in 2021, while the Medicare tax is charged on all net earnings. The combined SECA tax rate for 2021 is 15.3%, with 12.4% for Social Security and 2.9% for Medicare.

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It's important to note that the SECA tax is based on net earnings from self-employment, not gross income. This means that self-employed individuals can deduct business expenses before calculating their SECA tax. Additionally, self-employed individuals can deduct half of their SECA tax when calculating their federal income tax, which can help offset some of the burden of this tax.

Calculating SECA Taxes

Calculating SECA taxes involves several steps. First, self-employed individuals must determine their net earnings from self-employment. This is done by subtracting business expenses from gross income. Next, the net earnings are multiplied by 92.35% to account for the fact that employees are only taxed on 92.35% of their earnings for Social Security and Medicare. Finally, the resulting amount is multiplied by the SECA tax rate to determine the SECA tax.

For example, if a self-employed individual has net earnings of $100,000, they would first multiply this amount by 92.35% to get $92,350. Then, they would multiply this amount by the SECA tax rate of 15.3% to get a SECA tax of $14,129.55.

Paying SECA Taxes

SECA taxes are typically paid through quarterly estimated tax payments.This is different from employees, who have their Social Security and Medicare taxes withheld from their paychecks. The estimated tax payments are calculated based on the self-employed individual's expected income and expenses for the year.

If a self-employed individual does not make estimated tax payments, or if their payments are not sufficient to cover their SECA tax, they may be subject to penalties. Therefore, it's crucial for self-employed individuals to accurately estimate their income and expenses and make timely estimated tax payments.


While both SECA and the Federal Insurance Contributions Act (FICA) fund Social Security and Medicare, there are key differences between the two. The primary difference is who they apply to - SECA applies to self-employed individuals, while FICA applies to employees and their employers.

Another key difference is the tax burden. Under FICA, the Social Security and Medicare taxes are split equally between the employee and the employer. However, under SECA, the self-employed individual is responsible for the entire tax. This can result in a higher tax burden for self-employed individuals, although they can offset some of this burden by deducting half of their SECA tax when calculating their federal income tax.

Benefits and Drawbacks of SECA and FICA

Both SECA and FICA have their benefits and drawbacks. The primary benefit of both is that they fund Social Security and Medicare, providing essential benefits to individuals. However, they also come with a significant tax burden.

For employees, FICA can be less burdensome as the tax is split with the employer. However, they have less control over their taxes as they are automatically withheld from their paychecks. On the other hand, self-employed individuals under SECA have more control over their taxes as they make estimated tax payments. However, they bear the entire tax burden, which can be higher than under FICA.


The Self-Employment Contributions Act (SECA) is a crucial piece of legislation for self-employed individuals. It ensures that they contribute to and are covered by Social Security and Medicare, providing them with essential benefits. However, it also comes with a higher tax burden, making it essential for self-employed individuals to understand the nuances of this law.

By understanding SECA, self-employed individuals can better plan for their taxes and ensure that they are making adequate contributions to Social Security and Medicare. While it may seem complex, with careful planning and understanding, managing SECA taxes can be a manageable part of self-employment.

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