What is Self-Employment (SE) Tax?

Self-employment tax is the tax that covers Social Security and Medicare taxes for individuals who work for themselves. It's 15.3% of your net earnings (12.4% for Social Security and 2.9% for Medicare). When you work for an employer, they pay half of these taxes, but when you're self-employed, you're responsible for both the employee and employer portions. However, you can deduct half of your self-employment tax when calculating your income tax, which helps reduce your taxable income.

What are Business Write-offs?

Business write-offs (also called deductions) are legitimate business expenses that you can subtract from your gross income to reduce your taxable income. Common write-offs for side hustlers include: software subscriptions, equipment and tools, home office expenses, internet and phone bills (business portion), travel expenses, professional development, and advertising costs. Keeping good records of all your business expenses is crucial for maximizing your deductions and reducing your tax liability. Remember, expenses must be "ordinary and necessary" for your business to be deductible.

Why does my W-2 income matter for my side hustle taxes?

Your W-2 income matters because the US tax system uses progressive tax brackets - the more you earn overall, the higher your marginal tax rate. Your side hustle income is added to your W-2 income, and the total determines which tax bracket you fall into. This means if you already earn a good salary from your full-time job, your side hustle income will be taxed at a higher rate than if you had no other income. This calculator takes your W-2 income into account to provide a more accurate estimate of your total tax liability.

How much should I save for taxes?

A good rule of thumb is to save 25-30% of your net side hustle income for taxes, though the actual amount varies based on your total income, filing status, and state. Use this calculator to get a personalized estimate. It's also wise to make quarterly estimated tax payments to avoid underpayment penalties. The IRS requires you to pay estimated taxes if you expect to owe $1,000 or more in tax for the year and your withholding doesn't cover at least 90% of your total tax liability for the current year or 100% of the tax shown on your prior year's return.

Is this calculator accurate?

This calculator provides estimates based on 2025/2026 tax rates and rules. It's designed for educational and planning purposes to help you understand your tax obligations. Actual tax calculations can be more complex depending on your specific situation - factors like other deductions, credits, retirement contributions, and more can affect your final tax bill. For exact tax calculations and personalized advice, please consult with a qualified tax professional or use tax preparation software like TurboTax, H&R Block, or FreeTaxUSA.

How to use this Side Hustle Tax Calculator?

Using our calculator is simple and straightforward. Start by entering your gross side hustle income - this is the total amount you've earned before any deductions or expenses. Next, enter your business expenses - these are legitimate costs you've incurred to run your side business, such as software subscriptions, equipment, or travel costs. The calculator will automatically calculate your net profit by subtracting expenses from gross income.

Select your filing status (Single, Married Filing Jointly, or Head of Household) as this affects your standard deduction and tax brackets. Choose your state from the dropdown menu - different states have different tax rates, and some states like Texas and Florida have no state income tax. If you have a full-time job with W-2 income, enter that amount as well. This is important because your side hustle income will be taxed at your marginal rate based on your total income.

Once you've entered all your information, the calculator will instantly display your estimated tax obligations, including self-employment tax, federal income tax, and state tax. You'll also see the effective tax rate and the amount you'll keep after taxes. The pie chart provides a visual breakdown, making it easy to understand how much of your income goes to taxes versus what you keep.

What is the Self-Employment Tax rate in 2025?

The self-employment tax rate for 2025 remains at 15.3%, which is comprised of 12.4% for Social Security and 2.9% for Medicare. This rate applies to 92.35% of your net earnings from self-employment. For example, if your net profit from your side hustle is $50,000, your taxable self-employment income would be $46,175 ($50,000 × 0.9235), and your self-employment tax would be $7,064.78 ($46,175 × 0.153).

It's important to note that for 2025, the Social Security portion of the self-employment tax applies only to the first $147,000 of combined earnings (wages from employment plus self-employment income). The Medicare portion has no income limit. Additionally, if you earn more than $200,000 ($250,000 for married couples filing jointly), you'll owe an additional 0.9% Medicare tax on income above these thresholds.

The good news is that you can deduct the employer-equivalent portion of your self-employment tax (essentially half, or 7.65%) when calculating your adjusted gross income for federal income tax purposes. This deduction helps reduce your taxable income and can significantly lower your overall tax bill.

Top 10 Tax Deductions for Freelancers

Maximizing your tax deductions is one of the most effective ways to reduce your tax liability as a freelancer. Here are the top 10 deductions you should be aware of:

• Home Office Deduction: If you regularly and exclusively use part of your home for your business, you can deduct a portion of your rent, utilities, insurance, and maintenance costs. You can use the simplified method ($5 per square foot up to 300 square feet) or calculate actual expenses.
• Software and Subscriptions: Any software, apps, or online services you use for your business are deductible. This includes productivity tools like Microsoft Office, design software like Adobe Creative Cloud, project management tools, and cloud storage services.
• Equipment and Supplies: Computers, printers, cameras, microphones, and other equipment you purchase for your business are deductible. You can typically deduct the full cost in the year of purchase or depreciate it over several years.
• Internet and Phone: You can deduct the business portion of your internet and phone bills. Calculate the percentage of business use versus personal use and deduct accordingly.
• Travel and Transportation: Business travel expenses including flights, hotels, meals, and transportation are deductible. If you use your personal vehicle for business, you can deduct either actual expenses or the standard mileage rate (67 cents per mile in 2024).
• Professional Development: Courses, workshops, conferences, books, and training materials related to your business are deductible expenses.
• Marketing and Advertising: Website hosting, domain names, business cards, online ads, and any promotional materials are fully deductible.
• Professional Services: Fees paid to accountants, lawyers, consultants, and other professionals for business purposes are deductible.
• Insurance: Business liability insurance, professional liability insurance, and health insurance premiums (if self-employed) are deductible.
• Banking and Credit Card Fees: Business bank account fees, credit card processing fees, and other banking costs related to your business are deductible.

Remember to keep detailed records of all your expenses, including receipts and documentation of business use. Good record-keeping is essential if you're ever audited and can help you maximize your deductions legally.

When should I pay quarterly taxes?

If you expect to owe $1,000 or more in taxes for the year from your self-employment income, the IRS requires you to make quarterly estimated tax payments. The quarterly tax payment deadlines for 2026 are:

• Q1 (January 1 - March 31): Due April 15, 2026
• Q2 (April 1 - May 31): Due June 16, 2026
• Q3 (June 1 - August 31): Due September 15, 2026
• Q4 (September 1 - December 31): Due January 15, 2026

Making quarterly payments helps you avoid underpayment penalties and makes managing your cash flow easier. To calculate your quarterly payments, estimate your total income for the year, calculate your expected tax liability (you can use our calculator for this), and divide by four. You can also use the "safe harbor" rule: pay at least 100% of the taxes you owed last year (110% if your income was over $150,000) to avoid penalties.

If your income varies throughout the year, you can make unequal quarterly payments that correspond to your actual income each quarter. This is called the annualized income installment method, but it's more complex and may require professional help to calculate correctly.