Small Business Tax Calendar 2026

Running a small business means a tax deadline roughly every few weeks — and the expensive ones (1099s, payroll forms, the March entity returns) are exactly the ones nobody warns first-time owners about. This is the full 2026 calendar in one place: every date that matters, adjusted for weekends, with the new-for-2026 changes flagged so nothing ambushes you.

What's on the master 2026 calendar?

Dates below are the actual 2026 due dates, already shifted where the statutory date fell on a weekend. (Personal estimated-tax dates are here too, since most owners pay them — the deep dive on amounts and safe harbors lives in our Quarterly Tax Due Dates 2026 guide.)

Two structural things to memorize: pass-through returns are due a month before personal returns (mid-March, not April), and payroll forms never stop — Form 941 four times a year, deposits far more often.

Which deadlines carry the nastiest penalties?

Not all dates are equal. The three that hurt most per day of lateness:

• The March 16 entity returns. Late partnership or S-corp returns cost $255 per owner, per month, up to 12 months — for returns due in 2026, even if zero tax is owed. A three-partner LLC that "waits until April like always" is already ~$765 down. The extension (Form 7004) is automatic if filed by March 16 — the cheapest insurance in tax.
• Payroll deposits and Form 941. Deposit penalties scale to 15%, and the trust-fund recovery penalty can attach personally to owners. If payroll cash flow is tight, this is the bill to protect first.
• 1099-NEC / W-2 filings. Per-form penalties rise in tiers the longer you wait and can double for intentional disregard — and they apply per form, so 20 late contractor forms multiply fast.

By contrast, the April 15 income tax deadline is soft-ish for refunds and extendable for everyone — but an extension moves the paperwork only. Payment is still due April 15, and late payments accrue interest (6–7% during 2026) plus a monthly late-payment penalty.

What changed for 2026 filings?

Four updates worth flagging on this year's calendar:

1. 1099-NEC/1099-MISC threshold jumped from $600 to $2,000 for payments made in 2026 (indexed after). The forms you file by February 1, 2027 will be fewer — but bookkeeping still has to capture every payment, because deductibility and the contractor's taxability don't change.
2. The W-2 was redesigned for 2026: new Box 12 codes TP (qualified tips) and TT (qualified overtime premium), plus occupation codes in a new Box 14b. Employees can generally only deduct tips/overtime that's separately reported — meaning your payroll setup needed to start capturing this January 1. If yours didn't, mid-year is fixable; our employer guide to tips and overtime and the payroll setup walkthrough show exactly what to configure.
3. 1099-K relief is real: the threshold snapped back to $20,000 and 200+ transactions, so platform sellers see far fewer forms.
4. Late-filing penalties inflation-adjusted upward — the $255/owner/month figure above is the 2026 number.

What should you be doing right now (July) — and each remaining quarter?

Now (Q3): July 31 brings Q2's Form 941 and Form 5500 for retirement plans. Then September 15 is the year's biggest pileup — Q3 estimates plus every extended partnership and S-corp return. If your books aren't reconciled through June, this month is when to fix that, not September 10. Mid-year is also the natural checkpoint to true-up estimated taxes if 2026 is running hotter than planned.

Q4: November 2 (Q3 941), then December's quiet-but-decisive stretch: equipment placed in service by December 31 deducts in 2026, solo 401(k)s must exist by year-end, and W-9s should be collected from every contractor before the holidays — January is too late to chase them. Confirm your payroll system has clean year-to-date tip/overtime data before the final payroll run.

January–February 2027: Q4 estimates (January 15), then the February 1 wall of W-2s and 1099-NECs. Businesses that kept W-9s and payroll data current spend an afternoon here; businesses that didn't spend three weeks.

A pattern we see every year: the owner who misses one March deadline usually turns out to be missing three or four others nobody ever told them about. If this calendar has a date on it you've never filed for, that's the conversation to have this month. Problems come here to get solved.

How do extensions actually work?

• Entities: Form 7004 by March 16 buys partnerships and S-corps six months (September 15); C-corps get to October 15. Automatic if timely filed.
• Individuals: Form 4868 by April 15 moves filing to October 15.
• The catch, always: extensions extend filing, never payment. Estimate and pay by the original date or accrue interest and penalties on the shortfall.
• State calendars differ. Many states piggyback on federal dates; plenty don't (franchise taxes, annual reports, sales tax all run on their own clocks). Build your state's list alongside this one.

FAQ

What happens when a deadline falls on a weekend or holiday?

It rolls to the next business day — that's why 2026's January 31 obligations were due February 2, the March 15 entity returns on March 16, and the Q3 941 on November 2.

Do I send 1099-NECs to contractors operating as LLCs?

Generally yes for single-member LLCs and partnerships (at $2,000+ paid in 2026); generally no for corporations, including LLCs taxed as S- or C-corps. The contractor's W-9 tells you which — which is why you collect it before the first payment.

When are payroll tax deposits due, versus Form 941?

Form 941 is the quarterly report; deposits happen far more often — monthly or semiweekly depending on your lookback liability. Your payroll provider should schedule these automatically; verify, because the penalty lands on you, not them.

I never filed my S-corp election. Is 2026 lost?

Often not — late-election relief is routinely granted when requirements are met, sometimes years after the fact. It's paperwork with rules, not a lost cause.

Can WAYG just manage the whole calendar for us?

Yes — deadline management is baked into our year-round business plans: we track the dates, file the extensions, run the estimates, and you get a short email when something needs your signature.

Reviewed by the WAYG tax team · Updated July 2026