Nobody Tells New Freelancers About Quarterly Taxes Until the Penalty Shows Up

A year of client bills arrived in your bank account at full value. Then you sit down to file and see the problem: nobody took out a dollar for taxes. A W-2 paycheck has tax withheld automatically. Freelance income comes whole, and many new freelancers learn this when the tax bill and an underpayment penalty show up together.

What Estimated Tax Covers and Why the Bill Runs Higher

The IRS describes estimated tax as "the method used to pay tax on income that isn’t subject to withholding," and that includes self-employment income. The same IRS guidance says estimated tax pays both income tax and self-employment tax.

Self-employment tax is how freelancers pay Social Security and Medicare. At a W-2 job, your employer pays half and deducts the other half from your pay. When you work for yourself, you owe both halves. The tax code sets the rates at 12.4%^[1] for Social Security and 2.9% for Medicare on self-employment income (26 U.S.C. § 1401(a) and (b)(1)). That tax comes on top of income tax, which is why the first-year bill catches people off guard.

For tax year 2026, IRS Publication 505 says you generally must pay estimated tax if you expect to owe at least $1,000 after withholding and credits, and you expect those payments to fall short of the smaller of 90% of your 2026 tax or 100% of the tax shown on your 2025 return.

Four Deadlines That Do Not Fall Every Three Months

Publication 505 lists the tax year 2026 due dates:

• Income from January 1 to March 31: April 15, 2026
• April 1 to May 31: June 15, 2026
• June 1 to August 31: September 15, 2026
• September 1 to December 31: January 15, 2027

The second period covers only two months. If a due date lands on a Saturday, Sunday or legal holiday, a payment made on the next day that isn’t a Saturday, Sunday, or a holiday still counts as on time.

Why a Refund Won’t Save You From the Penalty

This rule surprises people more than any other. The IRS says that if you don’t pay enough by each period’s due date, you may be charged a penalty even if you are due a refund when you file your tax return. The penalty is figured separately for each payment period.

So it matters when you pay, and the annual total alone won’t protect you. If you pay everything in one lump at filing time, the IRS can still charge a penalty for each earlier period that came up short. Under the regular installment method, paying less than one-fourth of your estimated tax for any period can trigger it.

A Separate Tax Account Prevents the Problem

The fix is a habit. Every time a client pays you, move part of that payment into a separate savings account right away. Make your quarterly payments from that account and nothing else. How much to set aside depends on your income, deductions and state, so figure it with the 2026 Estimated Tax Worksheet in Publication 505. Many states also expect estimated payments, so check with your state revenue department.

Already Missed a Payment? Pay Now

Don’t wait for the next deadline. Pay what you can today. In a Publication 505 example, the penalty for late payments is figured up to the date the taxpayer actually paid, so each day you wait makes it larger. When your income changes, the IRS says to pay the unpaid balance by the next payment due date after the change.

If your income came in lumps, look at the annualized income installment method (Schedule AI in the Form 2210 instructions). With that method, your estimated tax payments vary with your income, which can lower or remove the penalty for quarters when you earned little.

Before January 15, 2027, fill out the Publication 505 worksheet using your 2026 client income so far. Then send the balance by direct transfer from your bank account.

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