Q2 Estimated Taxes Due June 15: Florida 2026 Self-Employed Plan

If you run a Florida small business, freelance, or own a piece of an LLC or S-corp, your second federal estimated tax payment of 2026 is due Monday, June 15, 2026. That gives you about six weeks to figure out what you owe and avoid a penalty that compounds every day you're late. Q1 just wrapped on April 15, and the IRS is already counting down to the next installment.

Florida owners get a structural break — there's no state income tax, so quarterly estimates are a federal-only conversation. But "no state tax" is not the same as "no estimated tax." Self-employment tax alone is 15.3% off the top, and the IRS doesn't care that you live in Tampa, Tallahassee, or Tarpon Springs. Here's the playbook every Florida self-employed owner should run before June 15.

Why June 15 Is the Real Deadline (Not the End of the Quarter)

The "Q2" in Q2 estimated taxes is misleading. The second installment doesn't cover April through June — it covers April 1 through May 31, a two-month window. That's why the deadline is in mid-June rather than mid-July. The federal estimated tax calendar is uneven by design:

Q1 — Covers Jan 1 to Mar 31. Due April 15.

Q2 — Covers Apr 1 to May 31. Due June 15.

Q3 — Covers Jun 1 to Aug 31. Due September 15.

Q4 — Covers Sep 1 to Dec 31. Due January 15 of the next year.

For 2026, June 15 falls on a Monday, so there's no weekend or holiday shift — the deadline is firm. Mark it. Set a reminder. Postal-mailed payments must be postmarked by June 15; electronic payments must be initiated by 11:59 PM Eastern.

Who Has to Pay (and Who Can Skip It)

The IRS rule is simple: if you expect to owe at least $1,000 in federal tax after withholding and credits, you generally must make estimated payments. That captures most of Florida's self-employed economy:

Sole proprietors and single-member LLCs — Schedule C income with no W-2 withholding almost always triggers the requirement.

S-corp shareholder-employees — Your W-2 wages are withheld, but K-1 distributions are not.

Partners in an LLC or partnership — Guaranteed payments and distributive shares come through clean of withholding.

Side-gig earners with a day job — If W-2 withholding won't cover the full year, the gap goes on quarterly estimates.

Anyone with significant 1099, investment, or rental income — Brokerages don't withhold by default; rental income never does.

The Two Safe Harbors That Keep You Penalty-Free

The IRS gives you two ways to bulletproof your quarterly payments. Hit either one and the underpayment penalty cannot be assessed, even if you end up owing a big balance in April 2027.

Safe Harbor 1 — Pay 90% of this year's actual tax. If your 2026 total federal tax liability ends up being $24,000, you're protected as long as you've paid at least $21,600 across the four quarterly installments and any W-2 withholding.

Safe Harbor 2 — Pay 100% of last year's tax (110% if you're a higher earner). Look up Line 24 ("Total tax") on your 2025 Form 1040. If your 2025 AGI was under $150,000, you only need to pay that exact amount across 2026 quarterly installments to be safe. If your 2025 AGI was over $150,000 (or $75,000 married filing separately), the bar moves up to 110%.

For most Florida small business owners, the prior-year safe harbor is the easier path because the number is fixed and known on Day One of the new tax year. Take 2025 total tax, multiply by 100% or 110%, divide by four — that's your minimum quarterly payment.

How to Calculate Your Q2 Payment in Three Steps

Step 1 — Pull your year-to-date numbers. Run a profit-and-loss for January 1 through May 31. Net profit (revenue minus deductible expenses) is your starting point. If your business is on a cash basis, count what actually hit the bank — not what you've invoiced.

Step 2 — Project your full-year net income. Multiply your year-to-date net profit by 12/5 (since two months of Q2 are already in the books). If Jan–May netted $40,000, you're on pace for roughly $96,000 for the year.

Step 3 — Apply the SE tax + income tax math. SE tax is 15.3% on 92.35% of net SE income. Income tax depends on your bracket. For a single filer with $96,000 projected net, expect roughly $13,560 SE tax + $9,200 income tax = $22,760 total. Divide by four: $5,690 per installment. Subtract Q1 to find your Q2 minimum.

Prior-Year vs. Current-Year Method: Which Should You Use?

Don't overpay just because the safe harbor number is bigger than your actual liability. Cash trapped at the IRS earns nothing and won't come back until your refund clears in 2027. Pick the lowest method that still keeps you penalty-free.

How to Actually Pay the IRS

IRS Direct Pay — Free, pulls from a checking account, no registration. Fastest for one-off payments.

EFTPS — Free, requires enrollment, but lets you schedule all four 2026 installments today and forget them.

IRS2Go app — Same backbone as Direct Pay, on your phone.

Mailed check with Form 1040-ES voucher — Still allowed. Postmark by June 15. Send certified mail — Florida hurricane-season delays are real.

The Penalty Math If You Skip Q2

The federal underpayment penalty is the IRS short-term rate plus 3% — through 2025 and into 2026 it's been roughly 7–8% annualized. A missed $5,000 Q2 payment costs about $30–$40 per month in interest until you catch up. The bigger pain is filing Form 2210 at year-end to reconstruct payment dates after the fact.

Florida-Specific Things to Watch

No state estimated tax — Florida has no individual income tax, so quarterly estimates are federal-only. Wonderful for cash flow, but it makes the deadline feel optional. It isn't.

Sales tax is separate — Florida sales tax filings to the Department of Revenue are unrelated to your federal estimates.

Hurricane disaster relief — If a federally declared disaster hits a Florida county before June 15, the IRS often extends the deadline. Check IRS disaster relief if a storm strikes.

Your Q2 Estimated Tax Checklist

1. Run year-to-date numbers by June 1 — Pull a clean P&L through May 31 from your bookkeeping software. Don't guess. The 30 minutes you spend here prevents the 3-hour scramble in April 2027.

2. Pick your safe harbor method — Open last year's Form 1040 and compare 100% (or 110%) of 2025 total tax against 90% of your 2026 projection. Use the lower one.

3. Calculate the Q2 minimum — Subtract what you already paid in Q1 from one quarter of your safe harbor amount. If you underpaid Q1, add the shortfall to Q2 to catch up.

4. Schedule the payment by June 13 — Two-day buffer protects you from bank holds, weekend posting delays, and the inevitable forgotten-password reset on EFTPS.

5. Keep the confirmation — Save the IRS confirmation number, the date paid, and the amount in a single tax folder. You'll need all three when filing your 2026 return.

6. Set a Q3 reminder for September 1 — Two weeks of lead time before the September 15 deadline. While you're at it, set Q4 (January 15, 2027) too.

7. Re-project at the half-year mark — In late July, look at January–June actuals. If your business is way up or way down from your Q2 projection, adjust Q3 and Q4 so you don't overpay or underpay all year.

The Bottom Line

Q2 estimated taxes aren't optional, aren't punitive, and aren't complicated once you've done the prior-year safe harbor math one time. Florida owners have it easier than most — no state filing, no double layer of estimates — but easier doesn't mean automatic. Get the calculation done in the next two weeks, pick the lowest defensible payment, and schedule it for June 13.

If you'd rather hand the math (and the paranoia about getting it wrong) to someone else, that's exactly what we do. Accounting BOSS works with Florida self-employed owners, single-member LLCs, and S-corps to run quarterly estimates the right way — using the lowest legal safe harbor, accounting for both income and SE tax, and scheduling payments before the deadline. Book a quick call and we'll have your Q2 number locked down before June 15.