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Side Hustles

The Side-Hustle Tax Shock: Why Self-Employed Retirees Pay Both Halves of Social Security Tax

Retirees earning income from side gigs face unique tax obligations, including paying the full self-employment tax that covers both employer and employee Social Security contributio

By The Money Zone Editors Updated July 24, 2026

Many retirees turn to side hustles to supplement their income, but it's important to understand the tax implications that come with self-employment. Unlike traditional employees, self-employed individuals—including retirees—are responsible for paying both the employee and employer portions of Social Security tax through the self-employment tax.

What Is the Self-Employment Tax?

The self-employment tax is a combined tax that covers Social Security and Medicare contributions. For employees, these taxes are split between the employer and employee. However, self-employed individuals must pay both halves themselves, which can come as a surprise to retirees starting a side gig.

Why Do Retirees Pay Both Halves?

When you work as an employee, your employer withholds half of your Social Security and Medicare taxes and pays the other half. If you’re self-employed, including running a side hustle, you effectively act as your own employer and employee, so you must cover the full amount. This means retirees earning self-employment income are subject to the full 15.3% self-employment tax (12.4% for Social Security and 2.9% for Medicare) on net earnings.

Example Scenario

Suppose a retiree earns $10,000 in net income from a freelance side hustle. They would owe approximately $1,530 in self-employment tax (15.3% of $10,000). In contrast, if the same income were earned as a W-2 employee, only about $765 would be withheld for Social Security and Medicare, with the employer covering the other half.

Alternatives and Next Steps

  • Track Your Earnings: Keep detailed records of your side hustle income and expenses to accurately calculate net earnings.
  • Consider Business Structure: Some retirees explore forming an LLC or S-corp to potentially reduce self-employment tax liability, though this involves additional considerations and costs.
  • Consult a Tax Professional: Tax rules can be complex, especially for retirees balancing Social Security benefits and self-employment income.

Bottom Line

Retirees who start side hustles should be prepared to pay the full self-employment tax, which includes both the employer and employee portions of Social Security and Medicare taxes. Understanding this tax obligation helps avoid surprises at tax time and ensures better financial planning for retirement income.

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