Common Payroll Mistakes and IRS Penalties for Small Businesses

By Yarik Yarosh, CPA ·September 5, 2026 ·6 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

Payroll compliance is one of the highest-stakes areas for small businesses because payroll taxes include trust fund taxes (employee income tax withholding and the employee share of FICA). These are money the employer holds in trust for the government. Failure to deposit them triggers some of the most aggressive IRS enforcement tools, including the Trust Fund Recovery Penalty (IRC 6672), which attaches personal liability to the business owner.

✓Key takeaway

Common payroll mistakes and their penalties:

1. Late payroll tax deposits.

1-5 days late: 2% penalty on the deposit amount
6-15 days late: 5% penalty
16+ days late: 10% penalty
10+ days after the first IRS notice: 15% penalty
For a $10,000 monthly deposit that’s 10 days late: $500 penalty
Interest accrues on top of the penalty at the federal underpayment rate

2. Worker misclassification (1099 vs W-2).

Back employer FICA: 7.65% of wages
IRC 3509 penalties: 1.5% of wages (income tax) + 20% of employee FICA
FUTA: $420/worker/year
State unemployment and workers’ comp: varies
See the worker classification articles for detailed analysis by industry

3. Incorrect or late W-2s.

W-2 deadline to employees: January 31
W-2 deadline to SSA: January 31 (electronic filing required for 10+ forms)
Late filing penalty: $60/form (1-30 days late), $130/form (31 days to August 1), $330/form (after August 1 or not filed)
Intentional disregard: $660/form with no maximum

4. Failure to file Form 941.

Due quarterly: April 30, July 31, October 31, January 31
Penalty: 5% of unpaid tax for each month (or fraction of a month) the return is late, up to 25%
If both late filing AND late payment: combined penalty can reach 47.5% of the tax

5. Failure to withhold.

If the employer doesn’t withhold the correct amount of income tax or FICA from employee wages, the employer becomes liable for the unwithheld amount
The employer can recover the employee share of FICA from future wages, but not from past wages already paid

6. Trust Fund Recovery Penalty (TFRP, IRC 6672).

If the business can’t pay the trust fund taxes (employee withholding + employee FICA), the IRS can assess the TFRP against any “responsible person” who “willfully” failed to pay
Responsible persons: owners, officers, bookkeepers, anyone with check-signing authority
The penalty is 100% of the trust fund amount (not a fine, it’s the full amount of the unpaid trust fund taxes)
TFRP survives bankruptcy (it can’t be discharged)
Multiple people can be assessed (the IRS will pursue whoever has assets)

How do late deposits snowball into serious liability?

Hypothetical example

Round numbers. A small S-Corp with 5 employees. Monthly payroll: $25,000 in gross wages. Total monthly payroll tax deposit (employer + employee FICA + income tax withholding): $8,000.

Scenario: the business falls behind on deposits for 3 months.

Month 1 (missed deposit):

Amount owed: $8,000
Penalty (15 days late): $400 (5%)
IRS sends CP136 notice

Month 2 (still not deposited):

Additional owed: $8,000
Cumulative: $16,000
Penalty on Month 1 (now 45 days late): $1,200 (15%, final tier)
Penalty on Month 2 (15 days late): $400
IRS sends CP504 (Intent to Levy)

Month 3 (still not deposited):

Additional owed: $8,000
Cumulative: $24,000
Penalty on Month 1: $1,200
Penalty on Month 2: $1,200 (now in final tier)
Penalty on Month 3: $400
Interest on all amounts: approximately $500
Total owed: $24,000 + $2,800 penalties + $500 interest = $27,300

Trust Fund Recovery Penalty:

Trust fund portion of the $24,000: approximately $16,000 (employee withholding + employee FICA)
The IRS assesses TFRP against the owner personally: $16,000
This is personal liability. If the S-Corp can’t pay, the owner’s personal bank accounts, investment accounts, and property are subject to levy.
The TFRP does NOT discharge in bankruptcy.

How to recover:

File all delinquent Form 941s immediately
Pay the trust fund portion first (this reduces personal liability under IRC 6672)
Apply for an installment agreement on the remaining balance
Contact a CPA or tax attorney before speaking with the IRS Revenue Officer

Prevention:

Use a payroll service (Gusto, ADP, Paychex) that makes deposits automatically
Never “borrow” from payroll tax deposits to fund operations (this is the most common path to TFRP)
If cash is tight, pay payroll taxes BEFORE paying vendors (vendors cannot levy your bank account)
Set up EFTPS (Electronic Federal Tax Payment System) for direct debit deposits

Illustrative numbers only, not a real client and not advice for your facts.

What are the penalties for late payroll tax deposits?

The IRS imposes graduated penalties for late payroll tax deposits: 2% if 1-5 days late, 5% if 6-15 days late, 10% if more than 15 days late, and 15% if still unpaid 10 days after the first IRS notice. These percentages apply to the unpaid deposit amount. The trust fund recovery penalty (IRC 6672) can hold owners, officers, and even bookkeepers personally liable for the employee’s share of unpaid payroll taxes, piercing the corporate veil entirely. This is one of the few tax penalties that cannot be discharged in bankruptcy.

How do I determine my payroll deposit schedule?

The IRS assigns businesses to either a monthly or semi-weekly deposit schedule based on the lookback period (the four quarters ending June 30 of the prior year). If total employment taxes during the lookback period were $50,000 or less, deposits are due monthly (by the 15th of the following month). Above $50,000, deposits follow a semi-weekly schedule (Wednesday/Friday based on payday). New businesses default to monthly. The schedule resets each calendar year. Regardless of schedule, accumulating $100,000 or more in undeposited taxes on any day triggers a next-business-day deposit requirement.

Related guides:

What payroll tax deposits are required and when are they due?

Federal payroll tax deposits include withheld income tax plus both the employee and employer shares of FICA (Social Security and Medicare), and the deposit schedule depends on your total tax liability. Monthly depositors must deposit employment taxes by the 15th of the following month, while semi-weekly depositors must deposit by Wednesday for Saturday-Tuesday paydays and by Friday for Wednesday-Friday paydays. The IRS assigns your deposit schedule based on your lookback period liability (the four quarters ending June 30 of the prior year): $50,000 or less means monthly, over $50,000 means semi-weekly. The $100,000 next-day deposit rule applies regardless of your regular schedule. If you accumulate $100,000 or more in employment taxes on any day, you must deposit by the next business day and switch to semi-weekly status for the remainder of the year and the following year.

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Cite this page

Yarik Yarosh, CPA. "Common Payroll Mistakes and IRS Penalties for Small Businesses." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-payroll-mistakes-penalties

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.