What to Do If There’s a Mistake on Your Business Taxes

A woman picks up tax forms in the lobby of the Farley Post Office in New York City on April 15, 2008. Chris Hondros/Getty Images

For small-business owners, preparing an income tax return is far from simple, which can increase the chances of making a mistake. Here are six steps that small-business pros say you can take to cope with that hair-on-fire feeling of discovering an error after you’ve filed—plus how to get things fixed quickly so you can go back to running your business.

Double Check Your Work

If you suddenly think something’s wrong with the tax return you already filed, make sure there is in fact a mistake before taking further action.

“Go back to the original preparer and verify what you’re seeing first,” says David Klasing, a certified public accountant and attorney in Irvine, California. “Don’t just assume the return is off, because your analysis could be wrong.”

Also, make sure you gave the preparer accurate information, says DeLisa Clift, who is a mentor with the Savannah, Georgia, chapter of SCORE, a national nonprofit that offers free resources to business owners.

Stay Calm

If all you’ve done is make a simple math error, the IRS’s automated systems may catch it, fix it, and send you a letter saying so, Clift says. If the math error means you underpaid or overpaid, the IRS will let you know that, too, she adds. If you can’t afford an extra tax bill right now, you may have time because the IRS offers payment plans that let people pay in installments.

Keep calm when you think you made mistakes in tax filing. Alohaflaminggo/Shutterstock

Figure Out Who’s Going to Fix the Mistake

If there’s indeed an error on your tax return—and it’s more than just you forgot to carry the one—figure out who will do the fixing. Your contract with your tax preparer may detail whether you or the preparer has to handle the work, Clift says.

“You really shouldn’t incur a cost if someone else has prepared your tax return for you,” she says.

Amend Your Tax Return

Amending your tax return means filling out either an IRS Form 1040-X or an 1120-X, depending on your business structure. Don’t try to DIY it, Klasing says.

“The preparation of a proper amended return involves so many steps that are counterintuitive,” he says. Some of those steps include showing where and how your tax return changed, providing documentation explaining why you’re amending your return, then remembering to actually amend your state tax return by filling out the new separate paperwork, if necessary.

Get Ready to Pay

If the mistake resulted in you underpaying the IRS, the IRS may hit you with interest and penalties in addition to the taxes you mistakenly didn’t pay. However, the IRS may give you a break on the penalties.

“Reasonable reliance on a professional is grounds for penalty abatement,” Klasing says. But good luck getting your preparer to admit to an error.

“If you can get the preparer to throw himself under the bus and say, ‘You know what? This is my error, not the client’s error,’ you’ve got two things: Number one, you got grounds for penalty abatement; number two, you’ve got grounds for a malpractice claim. That’s why it’s so rare for them to do it,” he says.

Save some money and pay the tax when you are asked. maitree rimthong/Pexels

Restrategize Your Filing Habits

Once you’ve fixed the error on your tax return, work on avoiding a repeat for next year. First, consider setting aside more time to review your return before filing it. In the eyes of the IRS, you’re personally responsible for everything on your tax return—even if someone else prepared it, Klasing says.

“Preparers make errors all the time, but you were under a duty to find those errors before you filed,” he says.

Second, you may want to review your relationship with your tax preparer. Some tax preparers may apply deductions or tax credits that you might find dubious, according to Klasing.

“They feel if they get the lowest tax liability in town, they’re going to have a line around the block,” he says. “It happens all the time.”

By TINA OREM of NerdWallet

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