Part of the LLC vs. S-Corp guide.
The main guide says to “run payroll through an actual payroll service” as part of protecting an S-corp election. This is what that actually involves — the registrations, the filings, and the deadlines that come with becoming your own employer.
What Has to Be Set Up Before Your First Paycheck
- An EIN — you likely already have this from forming the LLC, but confirm it’s active for payroll purposes
- State withholding registration — most states require you to register separately with the state Department of Revenue for state income tax withholding
- State unemployment insurance registration — a second, separate state registration, typically with a different agency than the one handling withholding
- A payroll provider or manual process — running payroll manually means calculating federal withholding using IRS Publication 15, Social Security and Medicare for both the employee and employer share, and any state withholding — genuinely error-prone without software built for it
- A pay frequency decision — many solo S-corp owners choose monthly for simplicity, though some states require more frequent schedules; consistency matters more than the specific choice
The Filings That Come With It
Form 941 — quarterly. Reports wages paid and taxes withheld each quarter. Due the last day of the month following each quarter: April 30, July 31, October 31, and January 31. Missing this triggers a failure-to-file penalty starting at 5% of unpaid tax per month.
Form 940 — annually. Reports Federal Unemployment Tax (FUTA), due January 31. The standard rate is 6% on the first $7,000 of wages, but timely state unemployment filings unlock a 5.4% credit, dropping your net federal rate to 0.6% — typically around $42 per year for a single employee. Note: if your business operates in a credit reduction state (California and the U.S. Virgin Islands currently fall into this category, and the list can change year to year), your federal credit is reduced, meaning your actual annual cost per employee will run notably higher — potentially $100–140+ instead of $42. Worth checking your state’s current status before assuming the baseline number applies to you.
W-2 and W-3 — annually. You issue yourself a W-2 as the employee, and file Copy A with the Social Security Administration by January 31. One practical note if you’re doing this manually rather than through software: Copy A can’t be printed on standard printer paper — the SSA requires specific scannable red-ink forms for paper submissions. This alone is one of the stronger practical arguments for using an actual payroll service rather than handling year-end filings by hand.
Federal tax deposits. Separate from the quarterly Form 941 filing itself — the IRS assigns a deposit schedule (monthly or semi-weekly, based on your lookback period) for actually depositing withheld taxes via EFTPS. New employers default to monthly. One genuine piece of relief for a micro S-corp: if your total quarterly payroll tax liability (withholding plus the employer match) stays under $2,500, you’re not required to make those periodic deposits at all — you can simply pay the full balance when you file the quarterly Form 941 itself. For a solo owner on a modest salary, this can eliminate the deposit-schedule question entirely.
The Mistake That Actually Creates Audit Risk
Treating everything you take out of the business as one continuous “draw,” without running any of it through actual payroll with real withholding, is the single biggest red flag in this area. The salary portion of your S-corp compensation has to run through payroll — federal income tax, Social Security, and Medicare actually withheld, not just labeled as salary after the fact. An S-corp owner who never runs a real paycheck is functionally still operating like a default LLC while claiming the tax treatment of an S-corp — exactly the gap the IRS looks for.
At minimum, run and deposit at least one real paycheck before December 31 of your first year electing S-corp status, so the IRS sees actual wages reported for that year, not just a year-end reclassification on paper.
Payroll Software vs. Doing It Manually
Manual payroll is technically possible using IRS tables and deposit schedules, but for a single-employee S-corp, the time cost rarely beats the price of a payroll service — providers built for solo owners typically run $40–200 a month and handle the 941, 940, W-2, and state filings automatically, which meaningfully reduces the risk of a missed deadline creating an avoidable penalty.
Don’t Forget the State Layer
Everything above is federal. Most states add their own requirements on top: state income tax withholding (unless you’re in a no-income-tax state), state unemployment tax, and sometimes separate quarterly filings on the state’s own schedule — not necessarily matching the federal calendar. A federal EIN does not cover state registrations; those are separate applications with separate agencies.
Documentation Worth Keeping
- Your written reasonable-compensation analysis, tied directly to the reasonable compensation breakdown already covered in this guide’s own spoke
- Payroll registers or provider reports for every pay period
- Confirmation of every quarterly 941 filing and deposit
- Copies of annual W-2/W-3 and 940 filings
Sources: IRS Publication 15 (Employer’s Tax Guide); IRS Form 941 and Form 940 instructions; IRS Topic 758 (deposit schedules); state payroll registration requirements (vary by state).
This article is educational content, not individualized tax or legal advice. Consult a qualified professional about your specific situation.