S Corp Tax Savings Calculator

How the S corp election saves payroll tax

A sole proprietor pays 15.3% self-employment tax on essentially all profit. An S corp owner splits profit into salary (payroll-taxed) and distributions (not). On $120k profit with a $65k salary, roughly $55k of distributions escapes the 15.3% - about $7,800 gross, $5,800 net of the added accounting. The election's entire value lives in that split, and this calculator prices it with your numbers.

"Reasonable salary" is the whole ballgame

The IRS requires salary matching what your role commands on the market - a $120k consultant paying themselves $20k is the textbook audit profile, and reclassification comes with back taxes and penalties. Defensible anchors: industry salary surveys, what you'd pay a replacement, 40–60% of profit as a sanity band. When in doubt, higher salary = lower saving but bulletproof.

When it's not worth it

Below ~$60–80k of consistent profit, admin costs eat the arithmetic. Also weigh: payroll obligations every single month, reduced QBI deduction interplay, state franchise taxes (California's 1.5% S corp tax changes the math), and lower Social Security credits from a lower salary. This is a planning estimate - the decision deserves a CPA hour.

Why the wage base bends the savings curve

The 12.4% Social Security portion of SE tax stops at the wage base this calculator uses ($176,100). Above it, both a sole proprietor and an S corp owner pay only the 2.9% Medicare piece on the marginal dollar. That means the S corp advantage is proportionally largest in the $80k–$170k profit band, where splitting off distributions dodges the full 12.4%. Push profit and salary well past the wage base and the marginal saving on additional distributions shrinks to just the 2.9% Medicare rate, plus the 0.9% Additional Medicare Tax on wages over $200k single / $250k MFJ, which S corp salary doesn't escape either. Run the numbers again after a big revenue year: the percentage saved on profit above the cap is smaller than it was on the first $176k.

The QBI deduction quietly claws some of it back

Section 199A gives pass-through owners a 20% deduction on qualified business income (QBI), but salary paid to yourself isn't QBI, it's W-2 wages, and it reduces the QBI base dollar for dollar. On the $120k profit / $65k salary example used above, QBI drops from $120k (sole prop) to roughly $55k (S corp profit net of salary), cutting the 20% deduction from about $24k to $11k, a swing of roughly $13k in deduction that's worth several thousand dollars in income tax depending on your bracket. This is a real offset against the payroll-tax saving, not a footnote, and it's part of why maximizing salary to "play it safe" on reasonable-comp costs more than the payroll math alone suggests.

Two shareholder costs the split doesn't show

Health insurance: a more-than-2% S corp shareholder's premiums are only deductible if they run through payroll and get added to W-2 Box 1 wages. Pay them straight from the business without that step and the deduction is gone. Retirement contributions: solo 401(k) and SEP limits are calculated off W-2 salary, not total profit or distributions. Set salary too low to squeeze the payroll-tax saving and you also shrink the 25%-of-compensation employer contribution room - a $30k salary caps employer 401(k) contributions near $7,500, while a $65k salary opens it to about $16,250. Chasing the smallest defensible salary can cost more in lost retirement space than it saves in SE tax.

Making the election: Form 2553 and the deadlines

Everything above assumes you've already made the S corp election, but the calculator won't do that part for you, and the timing rules trip people up more than the tax math does.

You elect S corp status by filing Form 2553 with the IRS. There are two deadline paths depending on when you're electing. A brand new entity gets 75 days from formation to file and have the election apply to its first tax year. An existing LLC or corporation that wants to switch for the current calendar year has to file by March 15 of that year, not December 31 like a lot of people assume, since the election has to be in before more than two and a half months of the tax year have passed.

Miss either deadline and the election just doesn't apply to that year, which stings if you'd already budgeted for the payroll-tax saving. There's a fix for genuinely missed deadlines though: late election relief under Revenue Procedure 2013-30 lets you request the election apply retroactively, as long as you can show reasonable cause for missing it and you've otherwise been acting like an S corp (paying yourself a salary, filing accordingly). It's not automatic, and a CPA filing it correctly the first time beats fixing a rejected one, but it exists and it saves a real number of businesses every year who find out about the deadline a little too late.

Related tools

Start from your true tax picture in the 1099 tax calculator, deduct the home office first with the home office deduction calculator, and check what you should be paying yourself via the billable hours calculator.