How are failure-to-deposit penalties calculated?

As a percentage of the underdeposited amount, tiered by lateness: 2% for deposits 1–5 days late, 5% for 6–15 days, 10% beyond 15 days or for amounts not deposited electronically, and 15% if still unpaid more than 10 days after the IRS demands payment. The tiers are set by Section 6656 and applied per deposit.

Should I just pay an IRS payroll penalty notice?

Not before checking it. Verify the quarter, match the IRS's deposit record against your EFTPS confirmations, and check how payments were applied — misapplied or misdated deposits are a common cause of erroneous notices. If the penalty is real, first-time abatement or reasonable-cause relief may remove it. Respond by the notice deadline either way.

When does a payroll notice require professional help?

Escalate when the notice involves trust fund recovery (Letter 1153 or a Form 4180 interview request), proposed worker reclassification, multiple compounding quarters, or amounts the business cannot pay. These carry personal-liability and examination stakes that a bookkeeper should not navigate alone — deadlines in them are short and rights expire.

Reading a payroll penalty notice before you pay it

A payroll penalty notice is an argument, not an invoice. It states a quarter, a penalty type, a computation — and any of the three can be wrong, most often the IRS's record of when deposits were applied. Before anyone pays, decode it: which form and quarter, which penalty section, and whether the IRS's payment history matches your EFTPS confirmations.

Decode it in four steps

Identify the notice. The CP number (top right), the tax form (usually 941), the period, and the penalty type — failure to deposit, failure to file, failure to pay, or an information-return penalty on W-2s/1099s.
Rebuild the quarter. Pull the filed 941, the payroll register, and every EFTPS confirmation for the period.
Match deposits date-by-date against the notice's payment transcript. The classic false positives: a deposit applied to the wrong quarter, a Schedule B that reported deposits instead of liability-by-payday, and a payment made on time but posted late.
Classify the outcome: IRS error (respond with proof), your error (consider abatement), or genuinely owed (pay by the deadline to stop interest and the next tier).

The deposit-penalty tiers, in concept

Section 6656 sets the failure-to-deposit penalty as a slice of the underdeposited amount, growing with lateness:

Failure-to-deposit penalty tiers (Section 6656)%

Applied per deposit to the underdeposited amount; the 15% tier applies when unpaid more than 10 days after IRS demand. Interest runs separately.

Two mechanics worth knowing. Deposits are applied to the oldest liability first by default, which can cascade one missed deposit into penalties on every later one — but you may designate how deposits apply within a short window after a penalty notice, often shrinking the damage. And the tiers apply per deposit, which is why a semiweekly depositor's bad month costs more than a monthly depositor's (/bookkeeping/payroll-compliance/payroll-deposit-schedules).

Getting penalties removed

First-time abatement is administrative and nearly automatic for a taxpayer with a clean three-year compliance history — often a phone call. It is the first thing to try on a first offense; the mechanics are at /fundamentals/first-time-penalty-abatement.
Reasonable cause covers the rest: disaster, serious illness, provider failure with prompt correction. Ordinary forgetfulness does not qualify, and "my payroll provider did it" helps only with documentation and fast remediation.
Filing on time even when you can't pay always shrinks the stack — failure-to-file penalties dwarf failure-to-pay.

When to call for help

Hand the file to a CPA, enrolled agent, or tax attorney — promptly, because these deadlines are short and rights lapse — when the notice involves:

Trust fund recovery: Letter 1153 or a request for a Form 4180 interview means the IRS is building personal liability against individuals under Section 6672. No one should sit that interview unadvised — see /irs-controversy/trust-fund-recovery-penalty.
Worker reclassification proposals (/bookkeeping/payroll-compliance/employee-vs-contractor).
Multiple open quarters, balances the business cannot pay, or anything headed toward IRS Appeals.

For everything smaller, the bookkeeper who can produce a clean deposit-by-deposit reconciliation usually wins. The notice file — notice, transcripts, EFTPS confirmations, correspondence — goes in the permanent records either way.