BlogTax EstimatorQuarterly Tax Calculator: Avoid Underpayment Penalties
Tax Planning6 min readJune 21, 2025

Quarterly Tax Calculator: Avoid Underpayment Penalties

If you have income without withholding, you need to pay estimated taxes quarterly. Here's how to calculate the right amount.

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Quarterly estimated taxes are due four times per year if you expect to owe at least $1,000 in federal taxes and your withholding won't cover your liability. The safest approach: pay 25% of your prior year's total tax liability each quarter (110% of prior year if AGI exceeded $150,000).

Who Needs to Make Quarterly Tax Payments

If you're a W-2 employee with no other income, your employer handles this. Otherwise, you're required to make quarterly estimated payments if:

  • You expect to owe at least $1,000 in federal taxes
  • Your withholding won't cover 90% of current year tax or 100% of last year's tax

This applies to freelancers, contractors, business owners, and investors with significant dividends or capital gains.

The IRS assessed $1.8 billion in underpayment penalties in 2022. The penalty rate reached 8% annualized as of 2024. Source: IRS Data Book 2022 — Source

The Two Calculation Methods

Method 1: Safe Harbor (easiest) — Pay 100% of last year's total tax in four equal installments. (110% if prior year AGI > $150,000.) No penalty regardless of what you actually owe.

Method 2: 90% of Current Year — Estimate current year tax and pay 90% in four installments. Better if income is significantly lower than last year.

Freelancers represent the fastest-growing segment of underpayment penalty assessments. Source: TIGTA Report 2023-40-033 — Source

2024 Due Dates

QuarterIncomeDue Date
Q1Jan 1–Mar 31April 15, 2024
Q2Apr 1–May 31June 17, 2024
Q3Jun 1–Aug 31September 16, 2024
Q4Sep 1–Dec 31January 15, 2025

Pay via IRS Direct Pay at IRS.gov/payments — free, no signup required.

See also: self-employment tax calculator and the tax estimator guide.

Get Started with Avenue — it tracks income by quarter and calculates your estimated payment for each period.

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Frequently Asked Questions

When are quarterly estimated tax payments due in 2024?
Q1 due April 15; Q2 due June 17; Q3 due September 16; Q4 due January 15, 2025.
How much should I pay each quarter?
The safe harbor: pay 100% of last year's tax liability (110% if prior year AGI exceeded $150,000) in four equal installments. Alternatively, pay 90% of your current year liability.
What happens if I miss a quarterly payment?
You'll owe an underpayment penalty at approximately 8% annualized (federal short-term rate plus 3 points) on the underpaid amount for the period it was due.

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