What does "backdating" actually mean here?

It means treating your S-Corp status as if it started on January 1st, even though you're filing the paperwork later in the year. If it's approved, your entire year gets taxed as an S-Corp instead of just the months after you file.

Do I need a good reason to file late?

Usually, yes. You'll typically need to explain why you didn't file on time and show that you've been running the business as though it were already an S-Corp. A tax professional can help you put that explanation together.

What if I've already paid myself as a sole owner this year?

That's normal and expected. If you backdate, you'll need to run extra payroll now to cover the months that already passed, essentially treating that income as salary after the fact. That's the catch-up payroll shown in your results.

Lettuce: Free Tool · Late S-Corp Election

Should you backdate your S-Corp election?

If you've been running your LLC on your own this year and just decided to become an S-Corp, you may be able to make that change retroactive to January 1st. See how much that could save you compared to starting today, and whether you still qualify.

1Your timeline

The clock is ticking: every month that passes is a month you can't backdate later. Once the year closes, this window closes with it.

Date you want S-Corp status to start

Date you'll file the paperwork

This tool backdates within the current calendar year only, from January 1st to today.

How much of the year has already gone by

0 mo already passed 0 mo left this year

2Your income & salary

Use what you'll make this whole year: what you've already earned plus what you expect to earn the rest of the way.

Total profit you expect this year

Yearly salary you'd pay yourself

Marital status & state taxes

Are you married?

Your state income tax rate (rough estimate is fine)

Extra money you'd save by backdating

$0 / year

Backdate to Jan 1

Your whole year gets S-Corp treatment

Start today instead

Taxed on your own for part of the year, then as an S-Corp

See your result

Enter your email to see how much backdating could save you, and what extra payroll you'd need to run.

Enter a valid email address.

Used by LLC owners weighing a late S-Corp election. No spam.

This is just an estimate, based on 2026 tax numbers. It's not tax or legal advice. You'll also need to explain why you're filing late, and whether that flies depends on your situation. Talk to a tax professional before you file.

Lettuce handles the paperwork and the extra payroll

We file the backdated election, explain the late filing, and run the back payroll for you, so nothing gets missed.

See How it Works

How this calculator works

If you've been running your LLC on your own this year and now want to switch to S-Corp status, you generally have two options: backdate the change to January 1st, or start fresh from today. This tool compares those two paths side by side.

For the backdated option, it treats your whole year's profit as if it were run through an S-Corp, with part of it paid to you as salary and the rest as a distribution. For the "start today" option, it splits your year in two: the months that already passed stay taxed the way a sole owner is normally taxed, and only the months from today forward get S-Corp treatment.

It then estimates the taxes each path would owe and shows you the difference, along with the extra payroll you'd need to run right now to cover the months you'd be backdating over. The numbers are built for comparison, not for filing. Your actual results depend on your full financial picture.

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