To fill out Form 1040-ES, project your 2026 income, run the numbers through the Estimated Tax Worksheet built into the form, arrive at a total tax figure, and divide it by four to get each quarterly payment. You then submit each installment either electronically or by mailing one of the four numbered vouchers that come with the form. The worksheet mirrors a simplified version of your annual return: adjusted gross income, deductions, income tax, self-employment tax, and credits.
Do You Actually Need to File It
Form 1040-ES applies if you expect to owe at least $1,000 in federal tax for the year after subtracting withholding and refundable credits.1Internal Revenue Service. Estimated Taxes That typically means freelancers, independent contractors, small business owners, landlords, and people with significant investment income. A W-2 employee with adequate withholding usually doesn’t need it.
Even if you owe, the IRS won’t penalize you as long as you hit one of two safe harbors: pay 90 percent of the current year’s tax, or 100 percent of last year’s tax, whichever is less.2Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty If your prior-year adjusted gross income exceeded $150,000 ($75,000 married filing separately), the prior-year figure becomes 110 percent.3Office of the Law Revision Counsel. 26 USC 6654 The prior-year number is the easiest anchor because it requires no forecasting.
What to Gather Before You Start
Pull your prior-year return (Form 1040 or 1040-SR) first. It gives you last year’s tax total for the safe harbor calculation and a baseline for income and deductions. Then collect current-year income records: 1099s, invoices, sales receipts, records of investment gains, and rental income received so far.
On the deduction side, gather records of business expenses (supplies, travel, home office costs, vehicle mileage), self-employed health insurance premiums, and retirement contributions. These reduce taxable income and change the quarterly figure directly. The current form and worksheet live at irs.gov; the 2026 edition of Form 1040-ES was released in February 2026 and carries the current year’s rates and deduction amounts.4Internal Revenue Service. About Form 1040-ES5Internal Revenue Service. 2026 Form 1040-ES
Working Through the Estimated Tax Worksheet
Line 1: Expected Adjusted Gross Income
Add up everything you expect to earn in 2026: business profits, wages from any W-2 job, investment income, rental income, and anything else taxable. From that total, subtract above-the-line adjustments such as deductible IRA contributions, student loan interest, and half of your self-employment tax. The SE tax deduction is easy to overlook and reduces AGI directly.6Internal Revenue Service. Self-Employment Tax
Deductions
Subtract either the standard deduction or your itemized deductions, whichever is larger. For 2026 the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
If you run a pass-through business (sole proprietorship, partnership, or S corporation), the worksheet has a separate line for the qualified business income deduction under Section 199A. That’s up to 20 percent of qualified business income, subject to income-based phase-outs for certain service businesses. For many self-employed taxpayers this is one of the largest available deductions, so don’t leave the line blank.
Self-Employment Tax
Self-employment tax covers Social Security and Medicare at a combined 15.3 percent: 12.4 percent Social Security plus 2.9 percent Medicare.8Internal Revenue Service. Topic No. 554, Self-Employment Tax The rate doesn’t apply to your full net profit. You first multiply net earnings by 92.35 percent, then apply the 15.3 percent to that reduced figure.
The Social Security portion applies only to net self-employment earnings up to $184,500 in 2026.9Social Security Administration. Contribution and Benefit Base Earnings above that cap still owe the 2.9 percent Medicare portion, and if total income exceeds $200,000 ($250,000 married filing jointly), an additional 0.9 percent Medicare surtax applies.
Income Tax, Credits, and the Per-Quarter Figure
Apply the 2026 brackets to your taxable income. Rates run from 10 percent on the first $12,400 for single filers up to 37 percent on income above $640,600.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Add your self-employment tax to the income tax figure, subtract expected credits and any withholding, and you have total estimated tax for the year. Divide by four. Each quarterly payment is that amount.
If your income changes materially during the year, rerun the worksheet before the next deadline and adjust the remaining installments. The worksheet is designed to be redone.
Filling In and Submitting the Vouchers
Form 1040-ES includes four tear-off payment vouchers numbered 1 through 4, one per quarter. If you mail payment, fill in your name, address, Social Security number, and the dollar amount on the correct voucher, then send it with a check or money order to the address listed in the Form 1040-ES instructions for your state. Write your SSN and “2026 Form 1040-ES” on the check. The postmark date controls timeliness.
Most people pay electronically and skip the voucher. IRS Direct Pay transfers money straight from a checking or savings account with no account setup; you pick “estimated tax,” the tax year, and the quarter, verify your identity from a prior return, and submit.10Internal Revenue Service. Direct Pay with Bank Account11EFTPS. Welcome to EFTPS Online12Internal Revenue Service. EFTPS Credit and debit card payments go through IRS-approved processors that charge 1.75 to 2.95 percent depending on the card and processor.13Internal Revenue Service. Pay Your Taxes by Debit or Credit Card
2026 Quarterly Deadlines
The four periods aren’t even. The second is only two months long. Dates for 2026:5Internal Revenue Service. 2026 Form 1040-ES
- Voucher 1: April 15, 2026, for income earned January 1 through March 31
- Voucher 2: June 15, 2026, for income earned April 1 through May 31
- Voucher 3: September 15, 2026, for income earned June 1 through August 31
- Voucher 4: January 15, 2027, for income earned September 1 through December 31
If a deadline lands on a weekend or legal holiday, it shifts to the next business day.14Internal Revenue Service. Individuals FAQ You can skip the January 15 payment if you file the full 2026 return and pay the balance by February 1, 2027.5Internal Revenue Service. 2026 Form 1040-ES A six-month filing extension does not extend estimated tax deadlines.15Internal Revenue Service. Extension to File Is Not an Extension to Pay
When Your Income Is Uneven
Equal quarterly payments work for steady income. They don’t work well if you earn most of your money in one stretch, land a large contract mid-year, or sell an investment late in the year. The IRS allows an alternative called the annualized income installment method, calculated on Schedule AI of Form 2210. Each installment is based on income actually earned in the period leading up to that deadline rather than a flat one-fourth of the annual figure.16Internal Revenue Service. Instructions for Form 2210 If you barely earned anything in the first quarter, your first payment can be small or zero, and later installments rise when the income arrives.
The tradeoff is paperwork. If you use Schedule AI for any period, you have to use it for all four, and you attach both Form 2210 and Schedule AI to your annual return.
Avoiding Underpayment Penalties
The IRS charges interest on any underpaid installment for the period it stayed underpaid. The underpayment rate for the first quarter of 2026 is 7 percent annually, adjusted quarterly.17Internal Revenue Service. Quarterly Interest Rates The cleanest way to avoid it is the prior-year safe harbor: pay 100 percent of last year’s total tax (110 percent if your AGI was above $150,000), spread evenly across the four vouchers.18Internal Revenue Service. Underpayment Penalty You’ll still owe any difference at filing, but no penalty.
Waivers exist in limited situations. If you retired after reaching age 62 or became disabled during the current or preceding tax year, and the underpayment came from the change rather than neglect, you can request one.19Internal Revenue Service. Topic No. 306 The IRS can also waive the penalty for casualty, disaster, or other unusual circumstances where imposing it would be against equity and good conscience, and taxpayers in federally declared disaster areas can receive an automatic 60-day extension that may be extended up to one year.20Internal Revenue Service. IRM 20.1.3 Estimated Tax Penalties
State Estimated Taxes Are Separate
Form 1040-ES is federal only. If you live in a state with an income tax, that state likely requires its own quarterly estimated payments with its own threshold, form, and deadlines, which don’t always match the federal schedule. States with no income tax, such as Texas, Florida, and Nevada, don’t require estimated payments. Check your state’s rules before you assume the federal filing covers you.