compliance Audience: self employed 3 min read

Quarterly Estimated Taxes: Who Needs to Pay and When?

Freelancers and business owners: The IRS is a 'pay-as-you-go' system. Learn how to calculate and pay quarterly taxes to avoid underpayment penalties.

If you have a W-2 job, your employer acts as your tax collector. They withhold money from every paycheck. If you are self-employed, you are the tax collector. The IRS expects you to send them money four times a year. If you wait until April 15th, they will charge you a penalty --- even if you pay in full. See our IRS underpayment penalty guide for exactly how penalties are calculated.

Key Takeaways

  • Due Dates: April 15, June 15, Sept 15, Jan 15.
  • Safe Harbor Rule: Pay 100% of last year's tax (or 110% if high income) to guarantee NO penalties.
  • Don't forget State taxes; they usually follow the same schedule.
  • Use IRS Direct Pay (online) to save the stamp and get a confirmation number.

Except… The Dates Are Weird

Notice the schedule:

  • Q1: Jan 1 - Mar 31. Due April 15. (Wait time: 15 days).
  • Q2: Apr 1 - May 31. Due June 15. (Wait time: 15 days). Note: Q2 is only 2 months long!
  • Q3: Jun 1 - Aug 31. Due Sept 15. (Wait time: 15 days).
  • Q4: Sep 1 - Dec 31. Due Jan 15. (Wait time: 15 days).

The uneven quarters (3 months, 2 months, 3 months, 4 months) trip everyone up. Put these dates in your calendar now.

How Much to Pay? (The Safe Harbor)

You don’t have to be perfect. You just have to be “Safe.” The IRS won’t penalize you if you meet one of two tests:

  1. You owe less than $1,000.
  2. You paid at least 90% of this year’s tax OR 100% of last year’s tax.

Strategy: If your income is volatile, just look at your 2025 Tax Return. Take “Total Tax” (Line 24). Divide by 4. Pay that amount each quarter. You are now bulletproof against penalties, even if you make $10 million this year. (NOTE: If 2025 AGI > $150k, use 110% of last year’s tax). Use our estimated tax calculator to estimate your annual tax liability, then divide by four for your quarterly amount.

The Self-Employment Connection

Remember: estimated taxes cover both income tax and self-employment tax. That 15.3% SE tax is often bigger than your income tax, so do not underestimate your quarterly payments.

If you are new to estimated payments, the IRS EFTPS system (Electronic Federal Tax Payment System) lets you schedule payments in advance --- set it up once and forget about it. You can also use IRS Direct Pay for one-time payments. For state payments, check your state’s website; most offer a similar online portal. If you are a 1099 contractor, estimated payments cover both income tax and SE tax --- use our 1099 tax calculator for a quick estimate.

For gig workers, see our dedicated guides for DoorDash taxes and Uber and Lyft taxes which walk through estimated payments for on-demand income.

How sharper.tax Helps

sharper.tax analyzes your uploaded return and calculates your safe harbor amount for the current year — so you know exactly how much to send each quarter to avoid penalties. We also flag if you are dramatically overpaying estimated taxes and giving the government a free loan. Sophisticated tax planning used to require a high-end CPA — we make it available for free.

Sources

The information above is educational and not tax advice.