Quarterly Estimated Taxes: A Complete Guide

The U.S. income tax is pay-as-you-go. When you work for an employer, withholding takes care of it. When you earn money that has no tax withheld, such as freelance income, rental income, large investment gains or a side business, the IRS expects you to make payments during the year rather than all at once in April. These are quarterly estimated taxes, and missing them can lead to penalties even if you pay your full balance when you file. This guide covers who must pay, when, how much and how to avoid penalties.

Who needs to make estimated payments?

You generally must make estimated tax payments if both of the following apply:

1. You expect to owe at least $1,000 in federal income tax for the year after subtracting withholding and refundable credits.
2. You expect your withholding and credits to be less than the smaller of 90% of this year’s tax or 100% of last year’s tax (110% for higher earners, covered below).

That describes most self-employed people, gig workers, small landlords and anyone with substantial interest, dividends, capital gains or other income without withholding. If you also have a W-2 job, you may be able to avoid estimated payments by increasing withholding using Form W-4, since withholding is treated as if it were paid evenly through the year.

2026 and 2027 due dates

The four "quarters" are not equal. The payment periods are January to March, April and May, June to August, and September to December.

Estimated tax due dates

Payment	Income earned	2026 due date	2027 due date
Q1	Jan 1 – Mar 31	Wed, Apr 15, 2026	Thu, Apr 15, 2027
Q2	Apr 1 – May 31	Mon, Jun 15, 2026	Tue, Jun 15, 2027
Q3	Jun 1 – Aug 31	Tue, Sep 15, 2026	Wed, Sep 15, 2027
Q4	Sep 1 – Dec 31	Fri, Jan 15, 2027	Tue, Jan 18, 2028

When a due date falls on a weekend or legal holiday, the deadline moves to the next business day, which is why the Q4 payment for 2027 is due January 18, 2028. The Q4 payment can be skipped if you file your return and pay the entire balance by January 31 of the following year. If you are reading this in late 2026, the next payment due is the fourth-quarter 2026 payment on January 15, 2027.

How much do you have to pay? The safe harbor rules

You do not have to predict your tax bill precisely. The IRS provides safe harbors: if your total payments (withholding plus estimated payments) meet one of these tests, you will not owe an underpayment penalty even if you owe a balance when you file.

• 90% of this year’s tax. Pay at least 90% of what you will owe for the current year.
• 100% of last year’s tax. Pay at least 100% of the total tax shown on last year’s return (which must cover 12 months). This is easy to compute because the number is already known.
• 110% of last year’s tax if your adjusted gross income on last year’s return was more than $150,000 ($75,000 if married filing separately).

The prior-year rule is especially useful when your income is growing. If last year’s total tax was $12,000, paying $3,000 each quarter (or $3,300 if you earned over $150,000) protects you from penalties, even if this year’s liability turns out to be $20,000. You still owe the balance when you file, but with no penalty.

Worked example: $80,000 of freelance profit

A single freelancer in Texas with $80,000 of net profit and no other income has an estimated total federal tax (self-employment tax plus income tax) of $16,647 for 2026. That is 20.8% of profit. Using the 90% safe harbor, total payments of at least $14,983 protect against penalties, or about $3,746 per quarter. Paying the full amount evenly would be $4,162 per quarter, which avoids a balance at filing.

The self-employment tax component is the part many people forget: as shown in the self-employment tax calculator, 15.3% of 92.35% of net profit is owed regardless of how little income tax you owe. A common planning rule is to set aside 25% to 30% of each payment you receive until you learn your real percentage.

How to calculate your payment

1. Estimate your net profit for the year: income minus business expenses. For uneven income, use your best estimate and update it each quarter.
2. Calculate self-employment tax on 92.35% of net profit (15.3% up to the $184,500 Social Security wage base for 2026; Medicare at 2.9% on everything).
3. Calculate income tax: subtract half of the SE tax, the standard deduction ($16,100 single, $32,200 married filing jointly) and any QBI deduction, then apply the brackets.
4. Subtract withholding from any W-2 job and credits.
5. Apply the safe harbor and divide by four, or by the remaining number of payments.

The quarterly estimated tax calculator performs these steps and shows both the "pay everything" amount and the safe-harbor amount. IRS Form 1040-ES includes a worksheet for those who prefer to calculate by hand.

Uneven income and the annualized method

If your earnings are lumpy (for example, most of your income arrives in the fall), equal payments in each quarter may overpay early and be a hardship. The annualized income installment method on Form 2210, Schedule AI, lets you match payments to when you actually earn the money, which can eliminate or reduce a penalty. It requires more record-keeping, so many people use it only when income is clearly uneven. Seasonal businesses and those with a large one-time sale often benefit.

How to pay

• IRS Direct Pay: free bank transfers directly from a checking or savings account.
• Your IRS online account: view balances and make payments.
• EFTPS: the Electronic Federal Tax Payment System, which allows scheduling payments in advance.
• Debit or credit card: through an IRS-approved payment processor, which charges a fee.
• Check or money order mailed with a Form 1040-ES voucher.

Choose "estimated tax" and the correct tax year when paying. Save the confirmation number; you will need to report all payments on your return, and misapplied payments are harder to fix later. Many states require their own quarterly estimates with separate due dates, so check your state revenue department.

Penalties for underpayment

If you fall short of the safe harbor, the IRS charges an underpayment penalty, which is interest on the shortfall for each quarter it remained unpaid. The rate is set quarterly based on the federal short-term rate plus three percentage points. The penalty is calculated on Form 2210 and is not large compared with the tax itself in most cases, but it adds up with big shortfalls and is easy to avoid. The IRS may waive it in cases of casualty, disaster or retirement after age 62 or disability.

Common mistakes

1. Ignoring Social Security and Medicare. Self-employment tax is owed even if income tax is zero.
2. Paying late quarters only. The penalty is assessed per quarter, so catching up in the fourth quarter does not erase earlier shortfalls.
3. Missing the new-year start. When your income changes mid-year, update your estimates rather than waiting.
4. Forgetting state taxes. A state tax underpayment can bring its own penalty.
5. Not setting money aside. A separate savings account for taxes keeps the funds available when each due date comes.

Combining good records, a realistic estimate, and a calendar reminder for each due date is enough to keep estimated payments painless. For details on reducing the profit these payments are based on, see self-employment tax deductions. This guide is general information and not tax advice.