The S corporation election is the most-used — and most-misused — tax structure in American small business. Used well, it saves owners five figures a year, every year. Used carelessly, it invites the exact audit it was designed to survive. The difference is a handful of annual decisions most owners never revisit.
Why the S corporation saves money at all
A sole proprietor pays self-employment tax on essentially every dollar of profit — 15.3% up to the Social Security wage base, and the Medicare portion beyond it. An S corporation owner splits profit into two streams: a reasonable salary, which carries payroll taxes, and distributions, which don't. Payroll tax stops applying to the distribution stream, and that's the entire engine. Everything else in S corporation planning is about running that engine without seizing it.
Reasonable compensation: the load-bearing wall
The IRS knows the game, and its counter is simple: your salary must reflect what you'd have to pay someone else to do what you do. Set it artificially low and an examiner can reclassify distributions as wages — with back payroll taxes, penalties, and interest. Defensible compensation looks at your role, hours, expertise, what comparable positions pay, and the company's revenue. Document the reasoning once a year, adjust it as the business grows, and the wall holds. Guess once and forget it, and every year that passes makes the file weaker.
The math, honestly worked
Take an illustrative business earning $200,000 of profit. As a sole proprietorship, nearly all of it faces self-employment tax. As an S corporation paying a defensible $110,000 salary, roughly $90,000 flows out as distributions free of payroll tax — a saving in the low five figures annually, repeated every year the business performs. Against that: payroll service costs, a separate business tax return, and state-level entity taxes (California, for example, levies its own tax on S corporation income). The election clears the bar comfortably for most businesses with six-figure profits — but it's math to verify with your numbers, not a rule of thumb to assume.
The QBI interaction most owners miss
Here's where one-lever thinking costs money: the Section 199A deduction is computed on business income after your salary — and above the income thresholds, it's limited by the W-2 wages the business pays. Cranking salary down maximizes payroll-tax savings but can shrink the wage base that supports your QBI deduction. The optimal salary frequently isn't the minimum defensible number; it's the point where payroll tax savings and the QBI deduction balance. That's a calculation, run annually, not a default.
Retirement plans ride on compensation too
Employer retirement contributions are computed from W-2 compensation — so an aggressively low salary also caps what you can shelter in a Solo 401(k), SEP, or cash balance plan. Owners in their peak earning years often deliberately run higher salaries to unlock larger deductible contributions. Salary design sits at the intersection of three systems: payroll tax, QBI, and retirement. Set it looking at all three.
The housekeeping that keeps the election alive
- Run actual payroll. A December catch-up paycheck is the classic red flag. Payroll runs all year, with withholding and filings on calendar.
- Health insurance for 2%+ shareholders follows special rules — premiums belong on the W-2 to preserve the deduction. Miss the mechanics and you lose it.
- Watch basis before distributions. Distributions beyond your stock basis are taxable gain — a surprise that surfaces in diligence or audit years later.
- Keep corporate formalities. Separate accounts, documented decisions, clean books. An S corporation run like a personal checking account defends nothing.
The state layer
States complicate the clean federal story: entity-level taxes, franchise minimums, and composite filings vary widely, and most states now offer pass-through entity tax elections that make state income tax effectively deductible at the federal level for owners above the SALT cap. If you operate in multiple states — or your owners live in different ones — the state layer can be worth more than the federal one. It's also where our local offices earn their keep.
When the S corporation is the wrong answer
The election has real losers: startups reinvesting every dollar (payroll obligations without cash-flow benefit), companies planning outside investors or multiple share classes (the S corporation allows neither), businesses eyeing the qualified small business stock exclusion (a C corporation game), and owners whose profit is modest enough that compliance costs eat the savings. Revisit the election whenever profit, ownership, or exit plans change materially — including before a sale, where entity history drives what deal structures are even available.
The annual review, in one list
- Re-run reasonable compensation against this year's role and revenue — and document it.
- Optimize salary against payroll tax, QBI, and retirement contributions together.
- Confirm health insurance and fringe benefits are reported correctly.
- Check basis before year-end distributions.
- Review state elections and multi-state exposure.
- Ask whether the election still fits where the business is going.
The mistakes we clean up most often
- The election that never ran payroll. Year one passes, no W-2 exists, and the cleanup involves late payroll filings and penalties that eat the year's savings. The election and the payroll service should start the same week.
- Personal spending through the entity. Every personal charge on the business card weakens both the books and the corporate shield — and hands an examiner exactly the narrative they want.
- Distributions past basis. Owners who pull cash without tracking basis discover taxable gain retroactively, usually during a loan application or diligence when it's most expensive to explain.
- A salary set once, in a different decade. Revenue tripled; the W-2 didn't move. The savings look great until the year they're reversed with interest.
- Missed state elections. The federal plan was tidy; the pass-through entity election that would have saved five figures was never filed because nobody owned the state calendar.
None of these are exotic. They're maintenance failures — which is the encouraging part, because maintenance is buyable.
Fixing the past — and knowing when to leave
Missed the election deadline? Relief procedures exist for late S elections when the intent was clear and returns were filed consistently — a well-documented request fixes more of these than owners expect. Ran a year without payroll? It's cleanable, but clean it proactively; the version where the IRS finds it first costs multiples more. And sometimes the right move is the exit: businesses raising outside capital, pivoting toward a qualified small business stock strategy, or shrinking below the profit level that justifies compliance costs should revoke deliberately — noting that a revoked election generally can't be re-made for five years. The S corporation is a tool with a service schedule, not a tattoo.
Before you act: model the expected benefit, the implementation deadline, the documentation required, and the effect on cash. Tax rules are fact-specific and change — confirm every strategy for the current year with your advisor.