What Happens If You Make a Payroll Mistake? (And How to Fix It)

Payroll mistakes happen. How serious they are — and how quickly you can fix them — depends on the type of error, when you catch it, and who you have in your corner when it happens.

The most common payroll mistakes

Before we get into consequences, it helps to understand the categories of payroll errors:

• Miscalculated wages — wrong hours, wrong rate, missed overtime
• Incorrect tax withholding — wrong filing status, missing deductions
• Late or missed tax deposits — federal and state payroll taxes have strict deadlines
• Missing new hire reporting — Illinois and Wisconsin both require reporting within specific timeframes
• Misclassified workers — treating an employee as a contractor (or vice versa)
• W-2 errors — incorrect wages or tax amounts reported at year-end

What the IRS does about payroll mistakes

The IRS takes payroll taxes seriously because they represent a significant portion of federal revenue. When payroll taxes are filed or deposited late or incorrectly, penalties apply — and they add up fast.

Late deposit penalties

If you deposit payroll taxes late, the IRS applies a tiered penalty based on how late the deposit is:

• 1–5 days late: 2% penalty
• 6–15 days late: 5% penalty
• 16+ days late: 10% penalty
• If not paid within 10 days of IRS notice: 15% penalty

These percentages apply to the amount of the late deposit — so on a $10,000 payroll tax deposit that’s 16 days late, you’re looking at a $1,000 penalty before interest.

Trust fund recovery penalty

This is the serious one. If the IRS determines that payroll taxes were withheld from employees but not remitted to the government, they can assess the Trust Fund Recovery Penalty — which makes the business owner personally liable for 100% of the unpaid taxes. This penalty can follow you even through business bankruptcy.

What Illinois and Wisconsin do about payroll mistakes

Both states have their own payroll tax requirements and their own penalty structures. Illinois IDOR and Wisconsin DOR both assess penalties for late or incorrect state withholding deposits. Illinois also has specific penalties for late new hire reporting — up to $500 per unreported hire.

What happens to your employees

Beyond the regulatory consequences, payroll errors directly affect your team. An employee who is underpaid — even once — loses trust. An employee whose W-2 is wrong has to file an amended tax return. These aren’t just administrative inconveniences — they affect real people’s lives and your reputation as an employer.

How to fix a payroll mistake

If you catch it before the payroll is processed

This is the easy case. Correct the error before submission and it’s as if it never happened. This is why reviewing payroll before approving it — every single cycle — matters.

If you catch it after direct deposit has been sent

For overpayments, you can typically recover funds on the next payroll run with employee consent. For underpayments, you should run an off-cycle payroll as quickly as possible to make the employee whole.

If you catch a tax filing error

File a corrected return as soon as possible. For federal payroll taxes, this is typically Form 941-X. For state taxes, each state has its own amended return process. The sooner you file, the lower the penalty — and voluntary correction before an audit is always better than correction after.

What to do if you’ve received an IRS notice

Don’t ignore it. IRS notices have response deadlines, and missing them makes the situation worse. If you receive a payroll tax notice, your first call should be to your payroll provider — and your second call should be to your accountant or tax advisor if the amounts are significant.

The bottom line

Payroll mistakes range from minor (easily corrected on the next run) to serious (IRS penalties and personal liability). The best defense is a payroll provider who processes your payroll correctly every time and handles your tax filings on your behalf — so you’re never in the position of explaining a late deposit to the IRS.