What Is Self-Employment Tax and Why Does It Matter?
Self-employment tax is the Social Security and Medicare tax that self-employed individuals pay instead of having it withheld from a paycheck. If you work for yourself — whether as a freelancer, independent contractor, gig worker, or small business owner — you are responsible for paying both the employee and employer portions of these taxes. This comes as a surprise to many new freelancers who are used to having taxes automatically taken out of their paycheck.
The total self-employment tax rate is 15.3% of your net earnings. This is made up of 12.4% for Social Security and 2.9% for Medicare. For comparison, employees pay only 7.65% (half of the total), with their employer matching the other half. When you are self-employed, you are both the employee and the employer, so you pay the full amount. However, you do get to deduct half of your self-employment tax from your income, which softens the blow somewhat.
In this comprehensive 2025 guide, we will walk you through everything you need to know about self-employment taxes: who has to pay, how to calculate what you owe, all the deductions you can take to lower your bill, how estimated tax payments work, what forms you need to file, and strategies for reducing your tax burden legally. Understanding these rules will help you avoid unexpected tax bills and penalties while maximizing your take-home pay.
Who Needs to Pay Self-Employment Tax?
The IRS considers you self-employed if you carry on a trade or business as a sole proprietor, independent contractor, or gig worker. You do not need to have a registered business or work full-time — even occasional freelance work or side hustle income counts. The threshold is fairly low: if your net earnings from self-employment are $400 or more in a year, you need to file and pay self-employment tax.
This applies to a wide range of people: freelance writers, designers, and developers; Uber, Lyft, and DoorDash drivers; Etsy and eBay sellers; consultants and coaches; real estate agents; and anyone else who earns money outside of a traditional employer-employee relationship. Even if you have a full-time job and do freelance work on the side, you still owe self-employment tax on that side income.
What Counts as Self-Employment Income?
Almost all income you earn from working for yourself counts as self-employment income. This includes payments from clients for services you provide, sales of products you make or resell, tips you receive, and income from gig economy platforms. If you receive a 1099-NEC or 1099-K form, that income is almost certainly self-employment income.
There are a few exceptions. Income from investments (stocks, bonds, rental property) is not self-employment income — those are taxed differently. Hobby income (activities you do for fun, not for profit) may not count either, though the line between a hobby and a business can be blurry. If you are regularly earning money from an activity and trying to make a profit, the IRS will likely consider it a business.
Business Structures and Self-Employment Tax
If you operate as a sole proprietor (the default for most side hustles and small businesses), you pay self-employment tax on all your net earnings. The same is true if you are a single-member LLC that has not elected to be taxed as a corporation — single-member LLCs are "disregarded entities" for tax purposes, meaning you still file Schedule C and pay self-employment tax.
If you form an S corporation, the rules change. With an S corp, you pay yourself a "reasonable salary" as an employee (with payroll taxes withheld), and any remaining profit passes through to you without self-employment tax. This can save you money once your income reaches a certain level (typically around $60,000+ per year), but it also adds administrative complexity and cost. For most people just starting out, a sole proprietorship or single-member LLC is simpler and fine.
- Net earnings of $400+ per year = you owe self-employment tax
- Freelancers, gig workers, side hustlers, and small business owners all qualify
- Side income from a full-time job still counts
- Sole proprietors and single-member LLCs both pay self-employment tax
How to Calculate Your Self-Employment Tax
Calculating self-employment tax is not as simple as multiplying your income by 15.3%. There are a few steps and adjustments involved. Understanding how it works will help you plan for your tax bill and find legitimate ways to reduce it.
The basic formula is: calculate your net profit (income minus business expenses), multiply by 92.35% (this is the equivalent of the employer deduction), then multiply by 15.3% to get your self-employment tax. The Social Security portion only applies up to a certain income limit, which changes each year. For 2025, the Social Security wage base limit is projected to be around $175,500 (up from $168,600 in 2024).
Step-by-Step Calculation
Step 1: Calculate your net earnings from self-employment. This is your total self-employment income minus all legitimate business expenses. This number comes from Schedule C of your tax return. Step 2: Multiply your net earnings by 92.35%. Why? Because employees only pay tax on 100% of their income, but employers get to deduct their half of the payroll tax. The 92.35% adjustment (100% minus 7.65%) simulates this employer deduction for the self-employed.
Step 3: Calculate the Social Security portion. For 2025, the Social Security tax (12.4%) applies only to the first $175,500 of your adjusted net earnings. If your adjusted net earnings are below that limit, multiply by 12.4%. If they are above, you pay 12.4% on $175,500 and 0% on the rest. Step 4: Calculate the Medicare portion. The Medicare tax (2.9%) applies to ALL your adjusted net earnings with no limit. Step 5: Add the Social Security and Medicare portions together — that is your total self-employment tax.
Additional Medicare Tax
There is also an Additional Medicare Tax of 0.9% on earnings above certain thresholds: $200,000 for single filers, $250,000 for married filing jointly, and $125,000 for married filing separately. This applies to both employees and self-employed individuals, and it only applies to the Medicare portion, not Social Security.
For self-employed people, this means your effective Medicare tax rate is 2.9% on earnings up to $200,000 (single) and 3.8% on earnings above that. This is on top of the regular 15.3% self-employment tax on the first $175,500. The Additional Medicare Tax is calculated on your Form 1040 and is not subject to the 92.35% adjustment that regular self-employment tax is.
Use our self-employment tax calculator to estimate your tax liability. Just enter your income and business expenses, and the calculator will show you how much you owe in self-employment tax, income tax, and total tax.
Deductible Business Expenses: Lower Your Tax Bill
One of the biggest advantages of being self-employed is that you can deduct legitimate business expenses from your income before calculating taxes. Every dollar you deduct saves you money on both income tax and self-employment tax. If you are in the 22% federal income tax bracket and paying 15.3% self-employment tax, every dollar of deductions saves you about 37 cents in taxes (37.3% combined rate).
The key is knowing what you can deduct and keeping good records. The IRS requires that expenses be "ordinary and necessary" for your business — meaning they are common and accepted in your industry and helpful and appropriate for your business. You do not need to spend money just to get a deduction, but you should absolutely deduct everything you are entitled to.
Common Business Deductions
Home office deduction: if you use part of your home regularly and exclusively for business, you can deduct expenses like rent, mortgage interest, utilities, and insurance. You can use either the regular method (calculating actual expenses) or the simplified method ($5 per square foot, up to 300 square feet). The simplified method is easier but may give you a smaller deduction.
Vehicle expenses: if you use your car for business, you can deduct either actual expenses (gas, maintenance, insurance, depreciation) or use the standard mileage rate (67.5 cents per mile for 2024, likely higher for 2025). The standard mileage rate is simpler and often gives a larger deduction. Keep a mileage log or use an app to track business miles.
Other common deductions include: office supplies and equipment; software and subscriptions; marketing and advertising costs; professional fees (accountants, lawyers); travel expenses; meals (50% deductible for business meals); education and training; and health insurance premiums (special deduction above-the-line).
Record Keeping Tips
Good record keeping is essential for maximizing deductions and surviving an IRS audit. Save all receipts, invoices, and bank statements. Use a separate bank account and credit card for business expenses — this makes tracking much easier and helps prove that expenses are business-related if the IRS asks.
There are many tools to help: QuickBooks, FreshBooks, Wave (free), or even a simple spreadsheet. Take photos of receipts with your phone and store them digitally — the IRS accepts digital receipts as long as they are clear and complete. Reconcile your accounts monthly and categorize expenses as you go. Do not wait until tax time to organize everything — that is when you will forget things and miss deductions.
- Every dollar of deductions saves you ~30-40% in combined taxes
- Deduct everything that is ordinary and necessary for your business
- Keep detailed records — receipts, mileage logs, bank statements
- Use separate business bank accounts and credit cards
Quarterly Estimated Tax Payments
Unlike employees who have taxes withheld from every paycheck, self-employed people are responsible for paying their own taxes throughout the year. The US tax system is pay-as-you-go, which means you need to make estimated tax payments every quarter if you expect to owe $1,000 or more in taxes for the year.
If you do not make estimated payments or pay too little, you could face underpayment penalties and interest when you file your return. The good news is that the rules are fairly straightforward, and there are safe harbor rules that let you avoid penalties even if you underpay during the year, as long as you meet certain criteria.
Due Dates and How to Pay
Estimated tax payments are due four times per year: April 15 (for income earned Jan-Mar), June 15 (for income earned Apr-May), September 15 (for income earned Jun-Aug), and January 15 of the following year (for income earned Sep-Dec). If the due date falls on a weekend or holiday, the deadline is the next business day.
You can pay online through the IRS website (IRS Direct Pay is free), by mail with a voucher, or through the IRS2Go app. You can also set up automatic payments. Make sure to note which quarter the payment is for so the IRS applies it correctly. State estimated tax payments are usually due on the same dates — check your state department of revenue website for details.
Safe Harbor Rules to Avoid Penalties
The IRS will not charge you an underpayment penalty if you meet one of the safe harbor rules. First safe harbor: you pay at least 90% of the tax you owe for the current year through estimated payments and withholding. Second safe harbor: you pay at least 100% of the tax you owed for the previous year (110% if your adjusted gross income was over $150,000, or $75,000 if married filing separately).
The second safe harbor is the easiest to use because you know exactly how much you need to pay. Just divide last year total tax by four and pay that amount each quarter. You will know you are safe from penalties, even if you end up owing more at the end of the year. If your income is growing quickly or you have a big year, you may want to pay more to avoid a large tax bill in April.
Tax Forms You Need to Know
Filing taxes as a self-employed person involves a few extra forms compared to being an employee. It is not as complicated as it sounds, but it helps to understand what forms you need and what they are for. You can file these yourself using tax software like TurboTax or H&R Block, or you can hire a tax professional — which is often worth the cost if your situation is complex.
The main form is still your Form 1040, just like everyone else. But you will add several schedules to it: Schedule C for business profit or loss, Schedule SE for self-employment tax, and possibly others depending on your situation. Let us walk through the most important ones.
Schedule C: Profit or Loss From Business
Schedule C is where you report your business income and expenses. This is the most important form for self-employed people. Part I is for income — list all the money you earned from your business. Part II is for expenses — list all your deductible business expenses by category (advertising, car and truck expenses, office expenses, supplies, etc.).
The bottom line of Schedule C is your net profit or net loss. This number flows to your Form 1040 and is also used to calculate your self-employment tax on Schedule SE. If your business had a loss (expenses exceeded income), you can usually deduct that loss from your other income, which reduces your overall tax bill. There are some limitations, though — see the IRS rules for details.
Schedule SE: Self-Employment Tax
Schedule SE is where you calculate how much self-employment tax you owe. You take your net profit from Schedule C, apply the 92.35% adjustment, and then calculate the Social Security and Medicare portions as we discussed earlier. The calculated self-employment tax goes on your Form 1040 as an additional tax.
You also get to deduct half of your self-employment tax as an adjustment to income on Form 1040. This is called the "above-the-line" deduction for self-employment tax, and it helps reduce your income tax. The combination of paying both halves of Social Security/Medicare but deducting half means the net effect is roughly equivalent to being an employee plus paying a bit more.
1099 Forms: Reporting Income
If you earned $600 or more from a single client or platform during the year, they should send you a Form 1099-NEC (Nonemployee Compensation) in January of the following year. Payment apps like PayPal, Venmo, and Cash App may send you a Form 1099-K if you received $600 or more in payments for goods and services.
Important: you need to report ALL your self-employment income, even if you do not receive a 1099 for it. The 1099 is just a convenience — the IRS expects you to report everything. If you receive a 1099, make sure the amount matches your records. If there is a discrepancy, contact the issuer to get it corrected.
Tax Planning Strategies for the Self-Employed
Once you understand the basics of self-employment tax, you can start planning strategically to minimize your tax burden. Tax planning is not about cheating or evading taxes — it is about using the tax code to your advantage and paying only what you legally owe. There are many legitimate strategies that can save self-employed people thousands of dollars per year.
The best strategy depends on your income level, business type, and personal goals. Some strategies are simple and anyone can use them. Others are more complex and require setting up retirement accounts or changing your business structure. Start with the easy ones and work your way up as your income grows.
Maximize Business Deductions
This is the simplest and most underutilized strategy: deduct every legitimate business expense you have. Many self-employed people leave money on the table because they do not track all their expenses or they are afraid to claim certain deductions. As long as an expense is ordinary and necessary for your business, you can deduct it.
Some commonly missed deductions include: home office expenses (use the simplified method if actual expenses are too complicated), business use of your personal phone and internet (calculate the business-use percentage), education and training that improves your skills, subscriptions and software, business gifts (up to $25 per person per year), and bank fees and interest on business loans.
Retirement Accounts for the Self-Employed
Self-employed people have access to several types of retirement accounts that offer big tax advantages. A SEP IRA (Simplified Employee Pension) is one of the simplest — you can contribute up to 25% of your net self-employment income (after the self-employment tax deduction), up to $69,000 for 2024 (likely higher for 2025). Contributions are tax-deductible, and the money grows tax-deferred until retirement.
A Solo 401(k) is another option for people with no employees other than themselves and their spouse. You can contribute as both employee and employer, up to $69,000 total for 2024 (plus an extra $7,500 catch-up contribution if you are 50+). Roth options are available. A SIMPLE IRA is a third option, though it has lower contribution limits. These accounts save you money on both income tax and self-employment tax (since contributions reduce your net earnings).
When to Consider an S Corporation
As your income grows, you might want to consider electing S corporation tax status for your LLC. With an S corp, you pay yourself a reasonable salary as an employee (paying FICA taxes on that amount), and the rest of your business profit passes through to you as a distribution, which is not subject to self-employment tax. This can save you significant money on self-employment tax.
The break-even point is usually around $60,000-$80,000 of net business income per year. Below that, the savings from reduced self-employment tax may not be worth the additional cost and complexity (payroll, additional tax forms, etc.). Above that, the savings can be substantial — potentially $5,000-$10,000+ per year. Talk to a tax professional to see if an S corp makes sense for your situation.
- Deduct everything you are entitled to — do not leave money on the table
- Use retirement accounts (SEP IRA, Solo 401(k)) to save on taxes
- Consider an S corp once your net income exceeds $60,000-$80,000
- Work with a good tax professional — they often save you more than they cost
Common Mistakes and How to Avoid Them
Self-employment taxes can be confusing, especially if you are new to working for yourself. Many people make costly mistakes their first year — mistakes that result in penalties, interest, or a much larger tax bill than expected. Being aware of these common pitfalls will help you avoid them and stay on the right side of the IRS.
The good news is that most mistakes are preventable with a little knowledge and planning. Even if you have made mistakes in the past, you can usually fix them or at least avoid repeating them. When in doubt, consult with a qualified tax professional — the cost is often far less than the penalties you might face for getting it wrong.
- Mistake 1: Not setting aside money for taxes — aim for 25-30% of every payment
- Mistake 2: Forgetting about quarterly estimated payments and facing penalties
- Mistake 3: Poor record keeping — missing deductions or unable to prove expenses in an audit
- Mistake 4: Mixing business and personal expenses — use separate accounts
- Mistake 5: Trying to do it all yourself when a professional could save you thousands
- Mistake 6: Underreporting income — the IRS gets copies of 1099s, so they know
Frequently Asked Questions
Do I need to file a Schedule C?
Yes, if you have self-employment income (income from a business or profession you operate as a sole proprietor or independent contractor), you need to file Schedule C (Profit or Loss From Business) with your Form 1040. This is where you report your business income and expenses and calculate your net profit or loss. Even if your business had a loss, you should still file Schedule C — the loss can often be deducted from your other income, reducing your overall tax bill.
Can I deduct health insurance premiums?
Yes! Self-employed individuals can deduct 100% of health insurance premiums for themselves, their spouse, and their dependents as an adjustment to income (above-the-line deduction), not as a business expense on Schedule C. This deduction reduces your adjusted gross income, which in turn reduces both your income tax and your self-employment tax. The deduction cannot exceed your net self-employment income, and there are other rules if you or your spouse have access to an employer plan. See IRS Publication 535 for details.
What is the difference between Schedule C and Schedule SE?
Schedule C calculates your net profit or loss from self-employment — it is where you report all your business income and deductible expenses. Schedule SE (Self-Employment Tax) uses the net profit from Schedule C to calculate how much self-employment tax (Social Security and Medicare) you owe. You file both schedules with your Form 1040. Think of it this way: Schedule C figures out how much money your business made, and Schedule SE figures out how much self-employment tax you owe on that profit.
What if I earned less than $400 from self-employment?
If your net earnings from self-employment are less than $400 for the year, you do not owe self-employment tax and you do not need to file Schedule SE. However, you should still file Schedule C if you have any self-employment income, and you should still file a tax return if you meet the general filing requirements. Also, even if you do not owe self-employment tax, you may still want to file to report the income for Social Security credit purposes — every year of earnings counts toward your future Social Security benefits.
How do I pay self-employment tax?
Self-employment tax is paid along with your regular income tax. If you expect to owe $1,000 or more in total taxes for the year, you should make quarterly estimated tax payments (which cover both income tax and self-employment tax) using Form 1040-ES. You can pay online through IRS Direct Pay, by mail, or through the IRS2Go app. If you also have a regular job with taxes withheld, you can increase your withholding to cover the self-employment tax instead of making estimated payments.
Can I deduct my home office?
Yes, if you use part of your home regularly and exclusively for business purposes, you can deduct home office expenses. There are two methods: the regular method, where you calculate actual expenses (mortgage interest, rent, utilities, insurance, depreciation) based on the percentage of your home used for business, and the simplified method, where you deduct $5 per square foot of home office space, up to 300 square feet ($1,500 maximum deduction). The simplified method is easier but may give you a smaller deduction.
What is the standard mileage rate for 2025?
The IRS sets the standard mileage rate each year. For 2024, the rate is 67.5 cents per mile for business use. The 2025 rate has not been officially announced yet but is typically announced in late December and is usually slightly higher than the previous year. The standard mileage rate covers the cost of gas, maintenance, insurance, depreciation, and other vehicle-related expenses. If you use the standard mileage rate, you cannot also deduct actual vehicle expenses — it is one or the other.
Do I need an EIN or can I use my Social Security number?
For most sole proprietors, you can use your Social Security number for tax purposes — you do not need an Employer Identification Number (EIN) unless you have employees or file certain types of returns. However, there are advantages to getting an EIN: it helps keep your SSN private, you need it to open a business bank account, and it looks more professional. You can get an EIN for free from the IRS in just a few minutes online.
What if I have both a W-2 job and self-employment income?
You still need to pay self-employment tax on your self-employment income, and you still need to file Schedule C and Schedule SE. Your W-2 income and self-employment income are combined on your Form 1040 for income tax purposes. For Social Security tax, the wage base limit applies to your combined wages and self-employment income — so if you already max out Social Security at your W-2 job, you will not owe the 12.4% Social Security portion on your self-employment income (though you will still owe the 2.9% Medicare portion).
Should I hire a tax professional or do it myself?
It depends on how complex your situation is. If you have a simple side hustle with straightforward income and expenses, you can probably do it yourself using tax software like TurboTax Self-Employed or H&R Block Self-Employed. If you have multiple income streams, significant deductions, employees, a complicated business structure, or you are just not confident doing it yourself, hiring a tax professional (CPA or enrolled agent) is worth the cost. They will likely find deductions and strategies you would have missed, often saving you more than their fee.