What is Quarterly Estimated Tax?
Quarterly estimated tax explained in plain English. Learn IRS deadlines, how to calculate what you owe, and how freelancers and self-employed people stay compliant.
What Is Quarterly Estimated Tax?
Quarterly estimated tax is the method the IRS uses to collect income and self-employment taxes from freelancers, independent contractors, and self-employed individuals who don't have taxes withheld from their income. As a freelancer, you're responsible for paying these taxes yourself — and the IRS wants them quarterly. Unlike a W-2 job where your employer withholds taxes with each paycheck, self-employment means zero withholding. The IRS designed the quarterly estimated tax system so they still get their money throughout the year rather than waiting until April. Each quarterly payment covers a specific period of income. You're estimating your total annual income, calculating the tax, and paying one-fourth of it. At tax filing time, you reconcile — if you overpaid, you get a refund; if you underpaid, you owe the difference plus potential penalties.
How Quarterly Estimated Taxes Work
Here's the step-by-step: Step 1: Determine Your Filing Status and Income Gather your expected annual net profit (income minus business expenses). This goes on your Schedule C as a sole proprietor, or you report it through your LLC or S-Corp as applicable. Step 2: Calculate Your Self-Employment Tax Self-employment tax = 15.3% on your net earnings (12.4% Social Security + 2.9% Medicare). If your net earnings exceed $200,000 (single) or $250,000 (married filing jointly), you pay an additional 0.9% Medicare tax. The good news: you can deduct half of your self-employment tax from your income when calculating your income tax — this reduces your overall tax burden. Step 3: Calculate Your Income Tax Apply your federal income tax bracket to your taxable income (after the self-employment tax deduction and standard/itemized deductions). Step 4: Divide Into Four Payments Take your total annual tax liability and divide by four. Make four equal payments by each quarterly deadline. Step 5: File Form 1040-ES Use IRS Form 1040-ES to calculate and pay your estimated taxes. You can pay via IRS Direct Pay, credit/debit card, or mail a check with the payment voucher.
Example of Quarterly Estimated Tax Calculation
A freelance designer earns $80,000 net profit in 2026. Self-Employment Tax: - 15.3% × $80,000 = $12,240 - Deduct half ($6,120) from income for income tax purposes Income Tax (simplified, assuming single, standard deduction): - Taxable income: $80,000 - $6,120 (SE tax deduction) - $14,600 (2026 standard deduction) = $59,280 - Federal income tax (approx. 22% bracket): ~$13,042 Total Annual Tax: ~$25,282 Quarterly Payment: ~$6,321 per quarter
How It Relates to Invoicing and Business
The quarterly estimated tax system is directly tied to your cash flow as a freelancer. Every invoice you send and get paid is income you'll owe taxes on. Smart freelancers set aside 25–30% of every payment received into a separate savings account designated for taxes. Eonebill's invoicing software helps you track income by client and project — making it easier to estimate your quarterly tax liability accurately rather than guessing. If you're consistently invoicing $15,000/month, your quarterly payments will be significantly different from someone netting $5,000/month. Related reading: - Self-Employment Tax Explained → - Schedule C: Freelancer's Tax Form → - Tax Brackets: What Freelancers Pay → Key Takeaways: 1. Quarterly estimated taxes are due four times a year: April 15, June 15, September 15, January 15 2. Set aside 25–30% of net freelance income for taxes 3. File Form 1040-ES to calculate and pay estimated taxes 4. You can pay via IRS Direct Pay, credit card, or mail 5. Missing quarterly payments or underpaying can trigger IRS underpayment penalties Stay ahead of your freelance taxes — Start Free with Eonebill