Your Q2 2026 Federal Estimated Tax Deadline Is June 16 — What Self-Employed US Owners Should Pay

Published May 20, 2026.

If you are self-employed in the United States — sole proprietor, single-member LLC, partner, S-corp shareholder taking a draw, or freelancer with 1099 income — your second-quarter 2026 federal estimated tax payment is due Monday, June 16, 2026. The usual June 15 date falls on a Sunday this year, which moves the deadline to the next business day. Miss it and the IRS quietly meters out an underpayment penalty for every day the cash is late, calculated at the short-term federal rate plus 3%.

This is the most-missed deadline in the small-business calendar. Owners remember April 15 because it has thirty years of cultural weight behind it. They forget June, September, and January, because nobody sends a reminder and the bill is calculated quietly in next April's return. This guide explains what is actually due, how to size the payment, and what the safe-harbor rules let you get away with.

The four quarterly deadlines for 2026

Federal estimated tax is paid in four installments. The "quarters" do not match calendar quarters — the IRS uses uneven periods, which catches owners off guard.

The Q2 window covers only April and May. That is two months of income, not three — which is exactly why first-time payers miscalculate it. Run a fast P&L for those two months before you size the payment.

Who actually has to pay estimated tax

You generally must make estimated payments if you expect to owe at least $1,000 of federal tax when you file your 2026 return after subtracting withholding and refundable credits. That threshold is published on the IRS estimated-taxes page (irs.gov/businesses/small-businesses-self-employed/estimated-taxes) and applies to:

• Sole proprietors and single-member LLCs with net self-employment income above roughly $5,000–$7,000 a year
• Partners drawing distributions from a partnership or multi-member LLC
• S-corporation shareholder-employees, on K-1 pass-through income above what their W-2 withholding covers
• Independent contractors earning 1099 income without W-2 withholding
• Investors with significant interest, dividends, capital gains, or rental income
• Recently retired or windfall-year individuals whose income has spiked

If you also have a W-2 job, your withholding counts toward the $1,000 test. Boosting W-2 withholding via a new W-4 is sometimes a cleaner alternative to writing quarterly checks — withholding is treated as paid evenly throughout the year regardless of when it was actually withheld.

The safe-harbor rules — 100% / 110% of prior-year tax

You do not have to estimate 2026 income perfectly to avoid a penalty. The IRS offers a "safe harbor" — pay enough across the year and they cannot charge an underpayment penalty even if your final 2026 tax turns out much higher.

You meet the safe harbor if your total withholding and estimated payments for 2026 equal at least the lower of:

1. 90% of your 2026 actual tax (the current-year test), OR
2. 100% of your 2025 total tax (the prior-year test) — but 110% if your 2025 adjusted gross income was over $150,000 ($75,000 if married filing separately)

The prior-year test is the one most owners use, because it is mechanical and certain. Pull your 2025 Form 1040, find total tax on line 24, divide by four, and you have your per-quarter safe-harbor payment. If your 2025 AGI was over $150,000, multiply by 1.10 first.

This is the single most useful rule in self-employment tax planning. As long as 2025 was a normal year, you can pay last year's number divided by four — and even if 2026 turns out to be your best year ever, the IRS cannot charge an underpayment penalty. You still owe the extra tax in April 2027, but penalty-free.

How to calculate your Q2 payment

You have two reasonable methods. Pick the one that fits your situation.

Method 1 — Safe harbor (recommended for stable-income owners). Take 2025 total tax (Form 1040, line 24). Multiply by 1.0 if AGI was under $150K, by 1.1 if over. Divide by four. That is your quarterly payment, every quarter, regardless of what 2026 actually looks like.

Example: Your 2025 total tax was $48,000. AGI was $180,000. Safe-harbor target = $48,000 × 1.1 = $52,800 / 4 = $13,200 per quarter.

Method 2 — Current-year estimate (for owners whose income has dropped or who want to pay less now). Project 2026 income through May, annualize it, run a rough tax calculation (federal income tax + 15.3% self-employment tax on net SE earnings up to the Social Security wage base of $176,100 for 2025; the 2026 figure will be released by the SSA in October), and divide by four. The IRS provides a working sheet inside the Form 1040-ES instructions that walks through this calculation line by line.

If you have a bookkeeper who closes your books monthly, this is a 30-minute exercise. If your books are six months behind, this is a flashing red light — start with a structured bookkeeping cleanup so you can actually see what you have earned. Owners who cannot tell me their net income through May are owners who are about to either over-pay or under-pay; both are expensive.

Form 1040-ES and how to pay

Form 1040-ES is the voucher form. It contains the worksheet, the four payment vouchers, and the mailing addresses. You do not have to mail anything. The cleanest way to pay is electronically:

• IRS Direct Pay — free bank-account transfer from irs.gov/payments/direct-pay. Choose "Estimated Tax" and "1040ES" as the reason and form. Keep the confirmation number.
• EFTPS (Electronic Federal Tax Payment System, eftps.gov) — free, requires a one-week enrollment first, but lets you schedule all four payments at once in January.
• IRS Online Account — view balance, payment history, and estimated payments in one place at irs.gov/payments/your-online-account.
• Debit/credit card — works, but carries a processor fee of 1.85%–2.89% which makes it the most expensive option.

Schedule all four payments at once if you can. The single most common reason owners miss September 15 or January 15 is that nobody reminded them.

What the penalty actually costs if you miss

The underpayment penalty is calculated as if it were interest on a short-term loan from the IRS to you. The rate is the short-term Applicable Federal Rate plus 3%, set quarterly. Through 2025 and into 2026 it has been running at 8% annualized. That means missing a $10,000 Q2 payment by 90 days costs roughly $200 in penalty. Missing it for the whole year, until you finally pay with your return on April 15, 2027, costs around $850.

The penalty is not catastrophic, but it is pure waste. It also compounds across quarters — three missed payments in a row builds a meaningful bill, and the IRS calculates it automatically on Form 2210. If you cannot pay the full estimated amount, pay something — even a partial payment dramatically reduces the penalty exposure for that quarter.

FAQs

Q: I'm an S-corp shareholder taking a salary. Do I still need to pay estimated tax?
Often yes. Your W-2 wages have withholding, but your K-1 pass-through income does not. If your K-1 distribution is significant relative to your W-2 wage, your withholding probably will not cover the full tax bill. Either increase your W-2 withholding via a new W-4 or make quarterly estimated payments on the K-1 portion.

Q: What if my income is uneven through the year?
Use the annualized income installment method on Form 2210, Schedule AI. You pay tax based on what you actually earned in each quarter, not in equal installments. This is the right method for seasonal businesses, consultants with lumpy projects, and anyone with a big Q4 closing. It requires accurate quarterly bookkeeping — which is part of why monthly close discipline matters.

Q: Do estimated taxes cover state income tax too?
No. Federal estimated tax is paid to the IRS. State estimated tax is a separate filing, separate due date, and separate payment system in each state that has an income tax. Most states mirror the federal deadlines, but not all — California, for example, front-loads the year (30% in Q1, 40% in Q2, 0% in Q3, 30% in Q4). Check your state's rules.

Q: I haven't paid Q1 yet. Should I make a big Q2 payment to catch up?
Yes. The IRS treats payments as applied to the earliest unpaid quarter first, which reduces the penalty period. Make a single payment covering both Q1 and Q2 by June 16. You will still owe a small Q1 penalty for the April 15 – June 16 gap, but stopping the bleeding is worth the catch-up payment.

Get your estimated tax right for the rest of 2026

If your books are not in a state where you can run a clean YTD P&L through May, your estimated tax payment is a guess — and guesses cost you money in both directions. We can close your books, calculate the correct safe-harbor payment, and schedule the remaining 2026 quarters so you stop thinking about deadlines.

Tell us about your business — we will come back with a clear plan for the rest of 2026.