If you've elected S-corp status and pay yourself a shareholder-employee salary, there is no single “S-corp payroll tax deadline” waiting to be memorized. There's a routing system. Your real due dates depend on three things: how much payroll tax your business owed during a specific lookback period, whether any single payroll run pushes your liability past $100,000 in one day, and whether you deposited on time all quarter. Get those three answers right and the calendar mostly takes care of itself.
This guide is built for solo owners who already run payroll for themselves as the only shareholder-employee — not for sole proprietors or partners who haven't elected S-corp status, and not for owners still deciding whether the election makes sense in the first place. If you're still weighing that decision, start with our S-corp election guide before you start circling dates you may not need yet.
Why does a solo owner even need a payroll calendar?
The IRS treats an S-corp shareholder-employee like any other employee on the books. Wages you pay yourself are subject to federal income tax withholding, Social Security tax, and Medicare tax, the same as if you'd hired staff. The rule that pulls a one-person S-corp into the full employer payroll-tax machinery is straightforward: a shareholder-employee performing services must receive reasonable compensation before the corporation makes non-wage distributions. That single requirement is what creates withholding obligations, Form 941 filings, a possible Form 940 filing, and a deposit schedule with real deadlines attached.
Monthly vs semiweekly — which depositor are you in 2026?
Every employer, including a solo S-corp, is assigned a deposit schedule for the calendar year based on a lookback period. For 2026, that lookback covers the four quarters from Q3 2024 through Q2 2025, checked against current IRS guidance as of mid-2026.
- If your total Form 941 tax liability across that lookback period was $50,000 or less, you're generally a monthly schedule depositor: taxes on wages paid during a calendar month are due by the 15th day of the following month.
- If it was more than $50,000, you're generally a semiweekly schedule depositor: taxes on wages paid Wednesday through Friday are due the following Wednesday, and taxes on wages paid Saturday through Tuesday are due the following Friday.
- Regardless of your assigned schedule, if your accumulated payroll tax liability reaches $100,000 or more on any single day within a deposit period, the next-business-day deposit rule overrides your normal schedule for that specific liability.
Most solo S-corps — paying one reasonable salary rather than running a team — land comfortably in the monthly bucket. That changes if income scales enough that the salary, plus employer and employee FICA, pushes the four-quarter lookback total past $50,000, or if a single bonus run crosses the $100,000 same-day threshold.
The decision tree: which calendar do you actually follow?
Run through four questions before you circle any date on your own calendar.
- Do you pay only yourself, or do you also run payroll for other employees? More people on payroll makes it more likely your lookback total crosses the monthly-to-semiweekly line.
- What was your total Form 941 tax liability for Q3 2024 through Q2 2025? At or under $50,000 keeps you monthly; over that moves you semiweekly.
- Did any single payroll run — a year-end bonus, for example — push your accumulated liability to $100,000 or more in one day? If yes, that specific liability is due the next business day, no matter your regular schedule.
- Did you deposit everything on time and in full all quarter? If yes, Form 941 gets a 10-calendar-day filing cushion after the quarter closes. If no, the return is due on the standard quarter-end date.
| Deposit rule | Trigger | When it's due |
|---|---|---|
| Monthly schedule | Lookback Form 941 taxes ≤ $50,000 | 15th of the month following the payroll month |
| Semiweekly schedule | Lookback Form 941 taxes > $50,000 | Following Wednesday (Wed–Fri payroll) or Friday (Sat–Tue payroll) |
| Next-day rule | Accumulated liability hits $100,000+ in one day | Next business day, overriding the regular schedule |
| Form 941, standard | Any depositor | Last day of the month after the quarter ends |
| Form 941, with cushion | All deposits timely and full for the quarter | 10th day of the second month after quarter end |
Scenario math: two solo S-corps, two different calendars
Scenario A: the $70,000 consultant on autopilot
A solo consultant nets roughly $70,000 and elects S-corp status, paying a defensible salary of around $30,000 — a “reasonable salary” figure that has to fit the specific work and market, not a number to copy directly. Because total payroll tax on that salary sits well under the $50,000 annual lookback threshold, this consultant is a monthly depositor. Payroll tax withheld from each pay run is due by the 15th of the following month, and Form 941 lands on the standard quarter-end schedule, with the 10-day cushion realistically available since deposits are small, predictable, and easy to make on time.
Scenario B: the $250,000 agency owner who outgrew monthly
A solo agency owner nets around $250,000, pays a $90,000 salary, and layers on a $60,000 year-end bonus run in December. Two things change. First, the combined payroll tax on a $90,000-plus salary across a full year can push the prior-year lookback total past $50,000, moving this owner to the semiweekly schedule for the following calendar year. Second, that single $60,000 bonus run — stacked onto the payroll tax already accumulated in the same deposit period — can trip the $100,000 next-day rule, meaning that specific deposit is due the next business day regardless of the semiweekly calendar. Miss it, and failure-to-deposit penalties and interest start accruing on the shortfall.
| Scenario | Depositor type | Date to watch |
|---|---|---|
| A: $70K net, $30K salary | Monthly | 15th of next month, every month |
| B: $250K net, $90K salary + $60K bonus | Semiweekly, plus next-day rule exposure | Next business day after any $100K+ liability day |
What about Form 940 and year-end?
Form 940 reports federal unemployment tax (FUTA) for the calendar year and runs on its own calendar, separate from Form 941 and your deposit schedule. For tax year 2025 wages, Form 940 is generally due February 2, 2026, or February 10, 2026 if all FUTA tax was deposited on time throughout the year. FUTA applies on top of Social Security and Medicare, and most solo S-corps owe it on their own wages the same as any employer would on a staff member's wages. As of mid-2026, verify the current-year Form 940 dates directly against IRS instructions before filing, since due dates shift around weekends and holidays.
Skip this calendar if…
- You haven't elected S-corp status yet and are still comparing entities — that decision should come before deadline tracking. See our comparison of LLC vs S-corp for solo owners.
- You take zero salary and only distributions. That isn't a calendar problem, it's a compliance problem the IRS can unwind through reclassification, and it needs a CPA conversation, not a due-date list.
- Your net income is low enough that S-corp payroll costs — software, a separate business return, possible state fees — could outweigh any self-employment tax savings. Run the break-even math in our S-corp election guide first.
- You're a sole proprietor or single-member LLC with no S-corp election filed. This entire calendar simply doesn't apply to you yet.
Where this fits in your financial OS stack
Payroll tax deadlines sit in the Protection layer of a solo owner's financial operating system, alongside quarterly estimated taxes, reasonable compensation documentation, and the entity paperwork that keeps an S-corp election intact. It pairs naturally with a quarterly estimated tax calendar for your personal return, and with dedicated payroll software built for one-person S-corps that can automate deposit scheduling so a missed date doesn't come down to memory alone.
Bottom line
There's no single S-corp payroll tax due date to memorize for 2026 — there's a routing system built on your lookback total, your assigned deposit schedule, and whether any single payroll run crosses $100,000. Most solo owners paying a modest, defensible salary land in the simplest lane: monthly deposits by the 15th, quarterly Form 941s on the standard calendar. Scale up, add a bonus run, or bring on staff, and the calendar tightens fast. Build the habit of checking your own lookback total each January, and lean on a CPA or enrolled agent to confirm your reasonable compensation figure and deposit status before penalties do it for you.