Estimated Tax Payments 2026: Due Dates, Safe Harbor and a Calculator for the Self-Employed

Nobody withholds tax from a freelancer's invoices, so the IRS expects you to pay it yourself, in four installments. For tax year 2026 three of them have passed; the last one is due January 15, 2027. The calculator below works out your 2026 income tax and self-employment tax, the smallest amount you must prepay to avoid a penalty, what is left to pay in January, and the penalty already building on any installment you missed.

---

Estimated Tax Calculator

Have your 2025 return handy (lines 11 and 24) and a projection of your 2026 profit: income so far plus what you expect through December, minus business expenses. If you also have a job, add the wages and the tax your employer will withhold for the full year. Enter the estimated payments you already made for April, June and September.

---

2026 Due Dates

Each installment covers income earned in a payment period. The periods are not equal quarters, which is why the second payment comes two months after the first.

Source: IRS Form 1040-ES (2026) and Publication 505 (2026), Table 2-1. None of the four dates falls on a weekend or legal holiday.

You can skip the January payment if you file your 2026 return and pay the full balance by February 1, 2027. Publication 505 states the rule as January 31; that date is a Sunday in 2027, and the 2026 Form 1040-ES gives February 1. The 2027 due dates follow the same pattern and will be confirmed when the IRS issues the 2027 Form 1040-ES.

---

Who Has to Pay Estimated Tax

The IRS says sole proprietors, partners and S corporation shareholders generally must make estimated payments if they expect to owe $1,000 or more when they file. The same applies to anyone with income that has no withholding: interest, dividends, rent, gains from selling assets, or a pension with too little withheld (Publication 505).

You owe no penalty at all, whatever your 2026 income, if all three of these are true (IRC section 6654(e)(2)):

• your 2025 tax year covered all 12 months,
• you had no tax liability for 2025, and
• you were a US citizen or resident for all of 2025.

So someone who started freelancing in 2026 after a year with no tax owes no penalty for 2026, although the full tax is still due in April 2027.

---

The Safe Harbor: How Much Is Enough

You avoid the penalty if your withholding plus estimated payments, paid on time, reach the smaller of:

• 90% of your 2026 tax, or
• 100% of the tax on your 2025 return, or 110% if your 2025 adjusted gross income was over $150,000 ($75,000 if you are married filing separately for 2026).

The prior-year route is usually the easier one, because the number is already known: divide it by four and pay that each quarter, even if 2026 income is higher. "Tax on your 2025 return" means Form 1040 line 24, minus refundable credits such as the earned income credit and additional child tax credit (Form 1040-ES instructions, "Figuring your 2025 tax"). Farmers and fishermen use 66⅔% in place of 90% and have different dates; the calculator does not cover them.

The safe harbor only stops the penalty. If 2026 income rose, you still owe the difference when you file.

The withholding shortcut. Income tax withheld from paychecks counts as paid in equal parts on the four due dates, unless you choose to use the actual dates (IRC section 6654(g)). If you or a spouse have a job, raising withholding on the last paychecks of the year can cover installments you missed earlier in the year, which an estimated payment made late cannot do.

---

Self-Employment Tax in 2026

Self-employment tax is the Social Security and Medicare tax an employer and employee would split, paid in full by you: 12.4% for Social Security plus 2.9% for Medicare, a total of 15.3%. It applies to 92.35% of your net profit, and the Social Security part stops at the 2026 wage base of $184,500. If you also earn W-2 wages, those wages use up the base first (Schedule SE, lines 8 and 9). There is no self-employment tax if 92.35% of your profit is under $400.

Our arithmetic from the 2026 Schedule SE method, with no W-2 wages. Above $199,783 of profit, 92.35% of profit exceeds $184,500, so only the 2.9% Medicare part keeps growing.

Two more pieces. Half of the self-employment tax is deducted when figuring adjusted gross income (IRC section 164(f)), which lowers income tax, not the self-employment tax itself. And a further 0.9% Additional Medicare Tax applies to combined wages and self-employment earnings above $200,000 ($250,000 married filing jointly, $125,000 married filing separately). Those thresholds are set in law and not indexed (Form 8959). Our self-employment tax guide has a calculator for this part alone.

---

The 20% QBI Deduction

Most sole proprietors can deduct up to 20% of qualified business income (IRC section 199A), limited to 20% of taxable income before the deduction, minus net capital gain. Qualified business income is your profit minus the deductible half of self-employment tax, self-employed health insurance and retirement plan contributions (Form 8995 instructions).

• 2026 thresholds: the full deduction applies with taxable income up to $201,750 ($403,500 married filing jointly, $201,775 married filing separately). It then phases down over the next $75,000 ($150,000 joint): to $276,750 ($553,500 joint) (Rev. Proc. 2025-32, section 4.26).
• Service businesses: health, law, accounting, actuarial science, consulting, financial and brokerage services, performing arts, athletics and the other fields listed in IRC section 1202(e)(3) lose the deduction entirely above the phase-down range. Other businesses above the range are limited by W-2 wages paid and business property, which is zero for a one-person business with no employees.
• New $400 minimum: from 2026, a taxpayer with at least $1,000 of qualified business income from active businesses gets a deduction of at least $400 (IRC section 199A(i), added by Public Law 119-21). How the 2026 forms apply this floor next to the taxable income limit has not been published.

The QBI deduction lowers income tax only. It does not reduce self-employment tax.

---

Worked Examples

Hypothetical cases run through the calculator: standard deduction, no children, no other income, all figures for tax year 2026.

Our calculations with the 2026 brackets and standard deduction (Rev. Proc. 2025-32), Schedule SE, Form 8959 and the QBI rules above. Illustrative only.

The designer pays $12,000 in estimated tax and still owes about $4,647 in April 2027, with no penalty. If the consultant's business were not a service business, the QBI deduction would be $6,303 and the 2026 tax $92,125.

---

The Underpayment Penalty

The penalty works like interest. Each installment that was short accrues at the IRS underpayment rate from its due date until you pay it or until April 15, 2027, whichever comes first. Payments go to the oldest shortfall first. Unlike most IRS interest, this penalty is not compounded (IRC section 6622(b)).

The rate is the federal short-term rate plus 3 percentage points (IRC section 6621(a)(2)). The calculator assumes 7% for early 2027.

What that costs the $80,000 designer above, who owes $3,000 a quarter:

• Nothing paid all year: about $551 by April 15, 2027.
• Nothing paid until a $12,000 payment on January 15, 2027: about $344.
• April and June paid, September missed, $6,000 paid January 15: about $70.

The penalty generally cannot be waived for reasonable cause. The IRS can remove or reduce it after a casualty, disaster or other unusual circumstance, or if you or your spouse retired after age 62 or became disabled in 2025 or 2026 and had reasonable cause (IRS, "Underpayment of estimated tax by individuals penalty"). If your income came mostly late in the year, the annualized income method on Form 2210, Schedule AI, can lower or remove the penalty for the early installments. The calculator does not model it.

---

How to Pay

• IRS Online Account: the IRS's preferred route. Pay from a bank account, see your payment history, up to 20 payments a day.
• IRS Direct Pay: pay from a bank account without signing in; it accepts estimated tax payments.
• Debit card, credit card or digital wallet: through IRS-approved processors, online or by phone. The processor charges a fee.
• Check or money order with the Form 1040-ES voucher, payable to "United States Treasury".
• EFTPS: individuals can no longer open new EFTPS accounts. Existing users can keep using it for now (IRS EFTPS page).

Keep a record of each payment's date and amount. You will need the total when you file your 2026 Form 1040.

---

Sources & Methodology

• IRS Form 1040-ES (2026): due dates, the February 1, 2027 rule, the estimated tax worksheet, the 2025-tax definition, payment methods.
• IRS Publication 505 (2026): payment periods (Table 2-1) and the January payment rule.
• Schedule SE (2026 draft) and Form 8959: 92.35%, the $184,500 base, the $400 floor, the 0.9% thresholds. The $184,500 base matches the Social Security Administration's notice (90 FR 49047).
• IRS Rev. Proc. 2025-32: 2026 brackets, standard deduction and QBI thresholds; Form 8995 instructions: what counts as QBI.
• Internal Revenue Code sections 164(f), 199A, 1401, 1402, 6621, 6622 and 6654 (Cornell LII).
• Internal Revenue Bulletins 2026-08, 2026-22 and 2026-36: Rev. Ruls. 2026-5, 2026-10 and 2026-15 (underpayment rates); IRS news release IR-2026-98.
• IRS pages "Estimated taxes", "Underpayment of estimated tax by individuals penalty", "Payments" and "EFTPS".

Method notes. The calculator follows the 2026 Form 1040-ES worksheet. Self-employment tax treats the W-2 wages you enter as Social Security wages when it reduces the $184,500 base. If you defer pay into a 401(k), your Social Security wages (box 3) are higher than box 1, and your real self-employment tax can be slightly lower. The QBI deduction assumes a business with no employees and no depreciable property. The penalty follows the Form 2210 regular method, with each estimated payment treated as made on its due date and withholding spread evenly. The 2026 Schedule SE and Form 8959 were still drafts and the 2026 Form 2210 instructions were not published as of October 13, 2026. Not included: the annualized income method, farming and fishing rules, SE optional methods, the alternative minimum tax, other credits and state estimated tax.

This article is educational and is not tax advice. Wealthy Pot is not affiliated with the IRS. Figures were checked against IRS forms, publications and the Internal Revenue Code on 2026-10-13.

---

FAQ

When are 2026 estimated taxes due?
April 15, June 15 and September 15, 2026, and January 15, 2027. You can skip the January payment if you file and pay in full by February 1, 2027.

I missed a payment. What now?
Pay the missed amount as soon as you can. The penalty runs daily at the IRS rate (7% a year for late 2026) only until the shortfall is paid, so a late payment costs less than none at all.

How much self-employment tax will I pay?
15.3% of 92.35% of your net profit, about 14.1% of profit, until the Social Security part stops at $184,500 of earnings. Half of it is deductible from income.

Do I have to pay estimated tax if I have a job too?
Only if withholding falls short of the safe harbor and you would owe $1,000 or more. Many people with a side business raise their W-4 withholding instead, which counts as paid evenly through the year.

Can I just pay everything in April with my return?
You can pay the tax then, but if you owe $1,000 or more and missed the safe harbor, the penalty applies to each quarter you were short.

---

Cite This Page

Journalists, educators and bloggers are welcome to cite this guide. Please link back so readers can reach the primary sources.

"Estimated Tax Payments 2026: Due Dates, Safe Harbor and a Calculator for the Self-Employed." Wealthy Pot, 2026. https://wealthypot.com/estimated-tax-payments-2026/