Quarterly Tax Calculator — Know What to Pay Each Quarter

What Are Quarterly Estimated Taxes?

In plain English: if nobody is withholding taxes from your income, the IRS expects you to send them money four times a year. That's quarterly estimated taxes.

When you work a W-2 job, your employer takes taxes out of every paycheck and sends them to the IRS on your behalf. You barely notice it happening. But when you're self-employed, freelancing, doing gig work, or earning rental income, there's no employer to do that for you. The IRS still wants their money throughout the year — not just in one lump sum in April.

Who needs to pay quarterly taxes? Anyone who expects to owe $1,000 or more in federal taxes after subtracting withholding and credits. This includes freelancers and independent contractors, gig workers (DoorDash, Uber, Etsy, etc.), landlords and rental property owners, retirees with investment income, and W-2 employees with significant side income whose withholding doesn't cover the extra.

If you're not sure whether you need to make quarterly payments, the calculator at the top of this page will tell you. Enter your income, expenses, and any W-2 withholding — if the remaining balance exceeds $1,000, quarterly payments are expected.

The Four Quarterly Deadlines

The IRS quarterly schedule doesn't follow calendar quarters evenly. Here are the four deadlines and what period each covers:

Q1 — April 15: Covers income earned January through March. This is also the annual tax filing deadline, so you're both filing last year's return and making this year's Q1 payment.

Q2 — June 15: Covers income earned April through May. Yes, just two months — this is the shortest "quarter."

Q3 — September 15: Covers income earned June through August. Three months.

Q4 — January 15 of the following year: Covers income earned September through December. Four months — the longest "quarter."

If a deadline falls on a weekend or federal holiday, it moves to the next business day. Mark these dates in your calendar now and set a reminder one week before each one.

How to Calculate Your Quarterly Payment

There are two main methods for calculating quarterly payments, and which one works best depends on how predictable your income is.

Method 1: Equal Quarterly Payments

This is the simpler approach. Estimate your total tax for the year, subtract any W-2 withholding, and divide the remaining amount by four. You pay the same amount each quarter.

For example, if your estimated total tax is $20,000 and your employer withholds $8,000 from your W-2 job, the gap is $12,000. Divided by four, your quarterly payment is $3,000.

This method works well when your income is fairly consistent throughout the year. The calculator above uses this approach.

Method 2: Annualized Income Method

If your income varies significantly by quarter (seasonal businesses, project-based freelancers, vacation rental hosts), you can use the annualized income installment method. This calculates each quarter's payment based on the actual income earned that quarter, rather than dividing evenly.

This method requires more math and Form 2210 Schedule AI at filing time, but it can reduce your payments in slower quarters and prevent overpaying early in the year. Most tax software handles the calculation if you go this route.

How W-2 Withholding Reduces Your Obligation

If you have a W-2 job alongside your self-employment income, your employer's withholding counts toward your total tax payment. You only need to cover the gap between your total estimated tax and what your employer already withholds.

This means your quarterly payments might be surprisingly small — or you might not need them at all if your employer is withholding enough. The calculator factors in W-2 withholding automatically.

How to Actually Pay the IRS

You have several options for making quarterly payments. Here are the most common, ranked by convenience:

IRS Direct Pay (irs.gov/directpay). Free, takes about five minutes, gives instant confirmation. This is the option most people should use. Select "Estimated Tax" as the reason for payment and "Form 1040-ES" as the form type. Enter your Social Security number, the tax year, and the payment amount. Done.

IRS2Go mobile app. The IRS has a mobile app that lets you make payments from your phone. Same free direct payment option, just from your mobile device.

EFTPS (Electronic Federal Tax Payment System). This is the IRS's system for scheduling payments in advance. You can set up all four quarterly payments at the beginning of the year and forget about them. Requires enrollment at eftps.gov (takes about a week to set up).

Credit or debit card. Accepted through third-party processors, but they charge a fee — typically 1.85-1.98% for credit cards or a flat fee around $2.50 for debit cards. Not recommended unless you're earning credit card rewards that offset the fee.

Check by mail. You can mail a check with a 1040-ES voucher, but this is the slowest and least reliable option. There's no instant confirmation, and mailed payments can be delayed or lost. Avoid this unless you have no other choice.

What Happens If You Don't Pay (Or Pay Late)

The IRS charges an underpayment penalty on amounts that should have been paid quarterly but weren't. The penalty works like interest — it's currently approximately 8% annually (the federal short-term rate plus 3 percentage points).

The penalty is not a flat fine. It's proportional to how much you underpaid and how long the payment was late. Here's a concrete example: if you should have paid $3,000 in Q1 (due April 15) and you pay it in October instead, the penalty on that quarter is roughly $120. That's real money, but it's not catastrophic.

The total penalty for missing multiple quarters adds up, but for most people it's in the hundreds of dollars — not thousands. The IRS calculates the exact penalty when you file your annual return.

The Safe Harbor Rule

The safe harbor rule is the easiest way to guarantee you won't owe an underpayment penalty, regardless of how much you end up owing.

Here's how it works: if you pay at least 100% of last year's total tax liability through a combination of withholding and estimated payments, no underpayment penalty applies — even if you owe more this year because your income went up.

If your adjusted gross income was above $150,000 (or $75,000 if married filing separately), the threshold is 110% of last year's tax.

This rule is particularly useful for people whose income fluctuates. If you had a big year but aren't sure next year will be as good, you can base your payments on last year's tax and avoid penalty risk. If you end up owing more when you file, you'll pay the difference, but there's no penalty on top of it.