Quarterly Estimated Tax Payments: Who Owes, When, and How Much

The U.S. tax system is pay-as-you-go. Employees have taxes withheld from each paycheck, but business owners, freelancers, and investors do not have that automatic withholding. Instead, the IRS requires quarterly estimated tax payments. Miss them, and you face underpayment penalties even if you pay everything by April 15.

Who Must Make Estimated Tax Payments?

You generally must make estimated tax payments if both of these conditions are true:

1. You expect to owe at least $1,000 in tax for the year (after subtracting withholding and refundable credits)
2. You expect your withholding and refundable credits to be less than the smaller of 90% of the current year's tax or 100% of last year's tax (110% if AGI exceeded $150,000)

This applies to sole proprietors, LLC members, S-Corp shareholders (on K-1 income), partners, freelancers, landlords, and anyone with significant investment income not subject to withholding.

C-Corporations have a separate threshold: estimated payments are required if the corporation expects to owe $500 or more in tax for the year.

Individual Estimated Tax (Form 1040-ES)

Individuals and pass-through entity owners use Form 1040-ES to calculate and submit estimated payments. The form includes a worksheet that helps you estimate your expected adjusted gross income, taxable income, taxes, deductions, and credits for the year.

2026 Due Dates for Individuals

Note that the quarters are not evenly split — Q2 covers only two months while Q3 covers three. This catches many first-time filers off guard. If the due date falls on a weekend or legal holiday, the payment is due the next business day.

Corporate Estimated Tax (Form 1120-W)

C-Corporations use Form 1120-W as a worksheet to calculate estimated tax, then make deposits using the Electronic Federal Tax Payment System (EFTPS). Corporate estimated tax due dates differ from individual dates:

The key difference is Q4: corporations pay in December, while individuals pay in January. For a complete list of C-Corp obligations, see our C-Corp tax deadlines guide.

Safe Harbor Rules

The safe harbor rules exist to protect taxpayers from underpayment penalties when income is unpredictable. If you meet either of these thresholds, you will not owe penalties regardless of how much you actually owe at filing time:

• Current-year safe harbor: Pay at least 90% of the current year's total tax liability through estimated payments and withholding
• Prior-year safe harbor: Pay at least 100% of last year's total tax liability (shown on line 24 of your prior-year 1040)
• High-income exception: If your AGI exceeded $150,000 ($75,000 married filing separately), the prior-year threshold increases to 110%

The prior-year safe harbor is the simplest approach for most business owners. Take last year's total tax, divide by four, and pay that amount each quarter. You are guaranteed to avoid penalties, even if this year's income doubles.

How to Calculate Your Estimated Payment

If you want to pay based on current-year income rather than the safe harbor method, follow these steps:

1. Estimate your total income for the year (including business income, investments, wages)
2. Subtract your expected deductions (standard or itemized) and any credits
3. Calculate the tax on your estimated taxable income using the current tax brackets
4. Add self-employment tax (15.3% of net self-employment earnings, with the employer half deductible)
5. Subtract expected withholding from W-2 wages or other sources
6. Divide the remaining amount by 4 for equal quarterly payments

Alternatively, you can use the annualized income installment method if your income is not evenly distributed throughout the year. This is more complex but can reduce your required payments in lower-income quarters.

Underpayment Penalty

The IRS charges an underpayment penalty on the amount by which your estimated payments fall short of the required amount. The penalty is calculated quarterly using the federal short-term interest rate plus 3 percentage points, which is approximately 8% annually in 2026. The penalty runs from the payment due date until the earlier of the date you paid or April 15.

For example, if you underpaid Q1 by $5,000, the penalty would be approximately $5,000 x 8% x (365/365) = $400 for a full year of underpayment. The actual calculation is more nuanced, as it accounts for partial payments and the exact number of days. Learn more about all IRS penalties in our late filing penalties guide.

Special Situations

New Businesses

If this is your first year in business, you have no prior-year tax to use for safe harbor calculations. You must estimate current-year income and pay at least 90% to avoid penalties. Many new business owners underestimate their first year's taxes — consider overestimating to be safe.

Seasonal Income

If your income is heavily concentrated in certain months (seasonal businesses, year-end bonuses, etc.), the annualized income installment method lets you match payments to when you actually earn the money, reducing the amount due in lower-income quarters.

S-Corp and LLC Owners

If you run an S-Corp, your W-2 salary has taxes withheld, but your K-1 distributions do not. You will likely need to make estimated payments on the distribution portion. For LLCs taxed as sole proprietorships or partnerships, virtually all business income requires estimated payments. See our LLC tax deadlines guide for specific dates.

Frequently Asked Questions

When are quarterly estimated tax payments due?

For individuals (Form 1040-ES), the due dates are April 15, June 15, September 15, and January 15 of the following year. For C-Corporations, estimated payments are due April 15, June 15, September 15, and December 15.

What is the safe harbor rule for estimated taxes?

The safe harbor rule protects you from underpayment penalties. You must pay at least 100% of last year's total tax liability through withholding and estimated payments. If your adjusted gross income exceeded $150,000 ($75,000 if married filing separately), you must pay at least 110% of last year's tax. Alternatively, you can pay at least 90% of the current year's tax.

What is the penalty for not making estimated tax payments?

The IRS charges an underpayment penalty calculated using the federal short-term interest rate plus 3 percentage points. For 2026, this is approximately 8% annually. The penalty is calculated separately for each quarter and applies to the amount of the underpayment for the number of days it was underpaid.