S Corp vs LLC: When Does the S Corp Election Save Tax?

An S corp election usually starts to save tax once your profit is comfortably above a reasonable salary for your role, enough that the payroll tax you avoid on distributions beats the extra cost of running payroll and a separate return. In our 2026 examples for a single filer with $2,000 of extra costs, the election roughly breaks even around $60,000 of profit and saves a few thousand dollars a year by $100,000. Below that, a plain LLC is usually simpler and cheaper.

All figures are for the 2026 tax year and will be updated when the IRS publishes new numbers.

LLC vs S corp is not an either-or choice

An LLC is a legal entity created under state law. An S corporation is a federal tax status. A single-member LLC is taxed like a sole proprietorship by default, but it can file Form 2553 to be taxed as an S corp while staying an LLC under state law. So the real question is: should your LLC (or corporation) elect S corp tax treatment?

The break-even math

Below the Social Security wage base ($184,500 for 2026), the payroll-tax saving is roughly:

Savings = 15.3% x (92.35% x profit - salary)

For the election to pay for itself, that saving must beat the extra running costs. With $2,000 of extra costs, the gap between 92.35% of profit and your salary needs to be more than about $13,072 ($2,000 / 15.3%). With a $40,000 salary, that means profit of roughly $57,500 or more just to break even on payroll tax.

Then there's a second hurdle the shortcut ignores: your salary isn't qualified business income, so the 20% QBI deduction gets smaller under an S corp. That pushes the true break-even a little higher.

Profit-by-profit table

These examples use the S Corp Tax Calculator's 2026 formulas for a single filer with $2,000 of extra S corp costs. The salaries are illustrations only. Yours must reflect what your role is worth (see how to set a reasonable S corp salary).

"Net payroll savings" is SE tax minus S corp payroll tax minus the $2,000 of costs. "All-in" also includes the change in estimated federal income tax, mainly from the smaller QBI deduction.

Two patterns stand out:

What the extra costs really include

The calculator's $2,000 default is a placeholder, not a benchmark. Get quotes for your own situation. Typical items:

If your state charges an S corp franchise or minimum tax, add it. A few states and cities don't recognize the S election at all, which can erase the federal saving.

Things that cut the other way

Timing the election

To be effective for a calendar year, Form 2553 is generally due no more than two months and 15 days after the start of the tax year, so around March 15. A new entity counts from the date it starts. The IRS offers relief for late elections in some cases, but it's easier to plan ahead. Many owners run one year as a default LLC, confirm the profit is steady, then elect for the next year. See the IRS S corporations page for filing requirements.

A quick decision checklist

If you answered yes to all five, the election is worth modeling in detail.

When to talk to a CPA or enrolled agent

Talk to a CPA or enrolled agent before filing Form 2553, especially if your income is near the QBI threshold, you have co-owners, your state taxes S corps at the entity level, or you're converting an existing business with assets or debt. They can model all-in tax, not just payroll tax, and set up payroll correctly from the first month.

Related guides

Learn how the self-employment tax you'd be reducing works in self-employment tax 2026 explained. Once you have payroll, plan your remaining tax with quarterly estimated taxes 2026. For entity choices beyond the S corp, see corporate tax planning strategies.

Model your own profit, salary and costs with the S Corp Tax Calculator, and compare against the self-employment tax calculator.

This guide is general information, not tax advice. Figures are for the 2026 tax year and will be updated as the IRS releases new figures.