The day you start working for yourself, the tax system stops doing things for you. No employer is taking tax out of each payment, no one is paying half of your Social Security and Medicare, and no one is sending the money to the IRS during the year. All three jobs are now yours. None of them is hard, but they come in a particular order, and most of the expensive mistakes freelancers make come from doing them out of order — usually by discovering the second tax in April.
This page lays out that order. It explains how the system fits together, what to do first, what can wait until your business is bigger, and which guide covers each piece in depth.
1. Confirm that the rules apply to you
The IRS generally treats you as self-employed if you run a business as a sole proprietor or independent contractor, or you're otherwise in business for yourself, including part-time work and gig work. You don't need to register anything for this to be true. If you invoice clients in your own name, you're a sole proprietor by default.
The filing threshold is low. If your net earnings from self-employment are $400 or more in a year, you have to file a return and pay self-employment tax, even if the work was a side job and even if you owe no income tax. Self-Employed Taxes 101 walks through the whole picture, including the two forms most freelancers add to their return: Schedule C for business income and expenses, and Schedule SE for self-employment tax.
2. Understand the two taxes you now owe
Here is the part that surprises people. As a freelancer you owe two separate federal taxes on the same profit, and they stack on top of each other.
The first is self-employment tax, which funds Social Security and Medicare. Its rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare. When you were an employee you only saw half of that come out of your paycheck — 6.2% for Social Security and 1.45% for Medicare — because your employer quietly paid the other half. Now you pay both halves.
Two details soften it and one adds to it. The Social Security part only applies up to a yearly limit on earnings, $184,500 for 2026; above that, only the Medicare part continues. You can also deduct one-half of the self-employment tax when you figure your adjusted gross income, which lowers your income tax a little. On the other side, an additional 0.9% Medicare tax applies to wages above $200,000.
The second is ordinary income tax, charged on your profit at the same graduated rates everyone pays. Self-Employment Tax vs Income Tax works through how the two combine on a real profit figure, which is the clearest way to see why a freelancer's total tax feels so much higher than an employee's.
3. Set money aside from every payment
This is the habit that decides whether tax season is calm or frightening, and it comes before any form. Every client payment you receive is partly the government's. The simplest protection is a separate savings account where a fixed share of each payment goes the moment it arrives, before you spend anything.
How large that share should be depends on your income, your state and your deductions. The IRS provides a worksheet to calculate your actual figure in Form 1040-ES; the guides above explain the common starting point freelancers use until they have a year of numbers to work from.
4. Pay during the year, not once in April
Because nobody withholds tax from your income, the IRS expects you to pay as you go. If you expect to owe $1,000 or more when you file, you're generally required to make estimated payments during the year.
The year is split into four periods, and each has a due date: April 15, June 15, Sept. 15 and Jan. 15 of the following year. When a date falls on a weekend or a legal holiday, the payment is on time if you make it on the next business day. Miss one, and you may owe a penalty that is calculated using the published quarterly interest rates for underpayments — in effect, interest on the money you should have paid earlier.
There's a built-in way to stay safe without predicting your income perfectly. You generally avoid the penalty if your payments cover at least 90% of this year's tax, or 100% of last year's tax — 110% if your adjusted gross income was over $150,000. Paying based on last year's number is the easiest version, because you know it already. Quarterly Estimated Taxes, Explained shows how to calculate and send each payment.
If your income arrives in bursts, equal quarterly payments can feel wrong, and sometimes they are. The IRS allows the annualized installment method, which lets payments follow the timing of your income. Handling Taxes on Irregular Income explains when it's worth the extra work.
5. Lower the bill with the deductions you're owed
Only after the basics are in place is it worth optimizing. You pay tax on profit, not on everything you invoice, so every legitimate business expense reduces the income both taxes are charged on. To be deductible, an expense has to be ordinary and necessary — common and accepted in your line of work, and helpful for it.
Two deductions deserve special attention because freelancers so often skip them. The home office deduction applies when you use part of your home regularly and exclusively for the business and it's your principal place of business. And the self-employed health insurance deduction can cover the premiums you pay for medical, dental and vision coverage, but not for any month you were eligible for an employer's subsidized plan, including a spouse's. Tax Deductions Every Freelancer Forgets to Claim goes through these and the rest of the list.
What can wait
People new to self-employment are often told they "need an LLC." For taxes, that's usually not true at the start. The IRS recognizes several business structures, and your structure determines which return you file, but forming an LLC does not by itself lower your tax. An S-corp election can, at higher profits, and it brings payroll and extra filings with it. It's a decision for when your business has a track record, not for your first month. LLC vs Sole Proprietor vs S-Corp explains when it starts to make sense.
State taxes can also wait until you've read up on your own state, because they vary so widely — but don't forget them. Many states run their own estimated-payment system alongside the federal one.
Your next step
If you haven't started yet, open a separate savings account today and move a share of your next payment into it. Then put the four federal due dates in your calendar. Those two actions prevent most of the problems described on this page, and everything else can be learned one guide at a time.
