One of the biggest surprises for new freelancers and self-employed workers is discovering that the IRS does not wait until April to collect taxes. Unlike W-2 employees whose taxes are withheld from every paycheck, freelancers are responsible for sending in their own payments — four times per year. Miss them, pay too little, or ignore them entirely, and you could face underpayment penalties on top of an already uncomfortable tax bill.
The good news is that calculating your quarterly estimated taxes is straightforward once you understand the system. This guide walks you through exactly how to do it.
Who Needs to Pay Quarterly Taxes?
The IRS generally requires you to make quarterly estimated tax payments if you expect to owe at least $1,000 in federal taxes for the year after subtracting any withholding and refundable credits. This applies to freelancers, independent contractors, sole proprietors, partners in a partnership, and S-corporation shareholders.
If you also have a W-2 job in addition to freelance income, you may be able to avoid quarterly payments by increasing your W-2 withholding to cover the additional tax from your freelance work. Ask your employer to withhold an extra flat dollar amount per paycheck using Form W-4.
When Are Quarterly Taxes Due?
The IRS quarterly estimated tax due dates for the 2024 tax year are:
- Q1 (January – March income): Due April 15
- Q2 (April – May income): Due June 17
- Q3 (June – August income): Due September 16
- Q4 (September – December income): Due January 15 of the following year
How to Calculate What You Owe Each Quarter
There are two methods the IRS accepts for calculating quarterly payments without incurring a penalty:
Method 1 — Pay 100% of last year's tax liability (or 110% if your prior year adjusted gross income exceeded $150,000). This is the simplest approach if your income is unpredictable. Look at last year's Form 1040, find the total tax line, and divide by four. Pay that amount each quarter regardless of what you actually earn.
Method 2 — Pay 90% of the current year's estimated tax liability. This method requires you to estimate your income and calculate your likely tax bill for the year. It works better if your income is lower this year than last, since you avoid overpaying.
Step-by-Step Calculation for Method 2
- Estimate your annual gross freelance income — your best projection for the full year
- Subtract business deductions — home office, equipment, software, professional development, health insurance premiums, etc.
- Calculate self-employment (SE) tax — multiply net self-employment income by 0.9235, then by 15.3%
- Deduct half of SE tax from income — the IRS allows this above-the-line deduction
- Subtract the standard deduction — $14,600 for single filers, $29,200 for married filing jointly (2024)
- Apply federal income tax brackets to the resulting taxable income
- Add SE tax and income tax together — that's your estimated annual tax burden
- Divide by four — that's your quarterly payment
How to Make the Payment
The easiest way to pay quarterly estimated taxes is through the IRS Direct Pay system at irs.gov/payments. It is free, accepts bank account payments, and provides instant confirmation. You can also pay by check made out to "United States Treasury" and mailed with Form 1040-ES, or through the Electronic Federal Tax Payment System (EFTPS) at eftps.gov.
What Happens If You Underpay?
If you pay too little in estimated taxes — or skip payments entirely — the IRS charges an underpayment penalty. The penalty rate is calculated based on the federal short-term interest rate plus 3%, and it applies to each quarter independently. For 2024, the underpayment penalty rate is approximately 8% annualized.
The penalty is typically small relative to the tax owed, but it adds up over time and creates an unpleasant surprise at tax time. More importantly, underpaying throughout the year means facing a large lump-sum bill in April — which can be a serious cash flow problem for freelancers with irregular income.
Tips for Staying on Track
- Set aside 25–30% of every freelance payment you receive into a dedicated savings account for taxes
- Make your quarterly payment immediately after each due date passes — don't wait until the last minute
- Track business expenses year-round so you have accurate deductions ready when calculating each payment
- If your income varies significantly quarter to quarter, consider using the annualized income installment method (IRS Form 2210, Schedule AI) to potentially reduce your required payments in lower-income quarters
Quarterly estimated taxes are one of the less enjoyable aspects of self-employment, but they become routine quickly once you understand the system. The key is to set aside money consistently, pay on time, and track your deductions carefully throughout the year.