How does S Corp payroll work when you're the only employee?
You run real payroll for yourself: a reasonable salary paid on a schedule, income tax and payroll tax withheld, quarterly Form 941 filings, federal and state deposits, unemployment filings, and a W-2 every January. Most brokers run a simple cadence โ a modest recurring salary through the year with a calibration payroll in December โ through a payroll provider, so the mechanics take minutes a month. The part that deserves real attention isn't the software; it's setting a defensible salary and using payroll's withholding as a tax-planning tool.
Yes, it's real payroll
The S Corp's tax advantage comes from splitting your income into salary and distributions โ which only works if the salary part is genuine. That means an actual payroll system producing actual paystubs, with:
- Withholding โ federal (and state) income tax plus the employee half of Social Security and Medicare, with the company paying the employer half.
- Deposits โ withheld taxes sent to the IRS on the required schedule (monthly for most single-owner S Corps).
- Quarterly Form 941 โ the payroll tax return, four times a year, even in quarters you pay yourself nothing.
- Unemployment โ federal FUTA (Form 940, annually) and state unemployment registration and filings, which apply to owner-employees in most states.
- A W-2 in January โ including the health-insurance add-back in Box 1 if the company pays your premiums.
A payroll provider automates nearly all of this for a modest monthly fee. Running it by hand is possible and almost never worth it โ the penalty for a late deposit exceeds a year of software costs.
The salary decision is the real work
The IRS requires reasonable compensation for the services you perform. There's no published formula โ it's a facts-and-circumstances judgment based on what your role would cost to replace, your time, your revenue, and industry data. Set it too low and the structure invites reclassification of distributions into wages, with back payroll taxes and penalties. Set it higher than necessary and you're donating payroll tax. The right number gets revisited annually as income changes โ and it also drives your retirement contribution room, your QBI wage limit, and your Social Security earnings record.
A cadence that works for commission income
Why this works: wage withholding is treated as paid evenly through the year regardless of when it's withheld โ so a December payroll with heavy withholding can retroactively fix underpaid quarters in a way estimated payments can't. The exact split and withholding level should come from a year-end projection, not a guess.
The mistakes that generate penalty notices
- No payroll at all. Taking only distributions from a profitable S Corp is the classic audit trigger โ and the fix after the fact is expensive.
- "Payroll" by bank transfer. Moving money without withholding, deposits, or filings isn't payroll; it's a distribution with extra steps.
- Missing the December window. Health insurance add-backs and salary true-ups have to land in the final payroll of the year. January is too late.
- Forgetting state registration. Withholding and unemployment accounts are state-level; skipping registration produces notices even when the federal side is perfect.
Payroll setup, the annual salary calibration, the December true-up, and the filings are all standing components of S Corp Management โ the goal is that you never think about a 941 again.
