Payroll Tax Basics: Form 941, Form 940, and Employer Tax Obligations

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 taxes are the one area of tax law where the IRS has the least patience and the most enforcement power. When an employer withholds federal income tax and FICA from an employee’s paycheck, those funds are held “in trust” for the IRS. Failing to deposit them triggers the Trust Fund Recovery Penalty (IRC 6672), which makes the business owner PERSONALLY liable for the unpaid taxes, even if the business is a corporation or LLC. This personal liability survives bankruptcy. The mechanics of payroll tax are straightforward: withhold federal income tax (based on the employee’s W-4), withhold employee FICA (6.2% Social Security + 1.45% Medicare = 7.65%), match the employee FICA with an equal employer share (another 7.65%), deposit the combined amount with the IRS on the required schedule, and file Form 941 quarterly to report it all.

✓Key takeaway

Payroll tax overview (2025):

What the employer must do:

Withhold federal income tax from employee wages (based on W-4)
Withhold employee FICA: 6.2% Social Security + 1.45% Medicare = 7.65%
Pay employer FICA match: another 7.65% (the employer’s cost)
Deposit both shares with the IRS on the required schedule
File Form 941 (quarterly) to report withholding and FICA
Pay FUTA (Federal Unemployment Tax): 6.0% on first $7,000 per employee, minus state credit (usually 5.4% credit = 0.6% net)
File Form 940 (annually) to report FUTA
Issue W-2 to each employee by January 31
File W-2s with the Social Security Administration by January 31

Tax rates (2025):

Tax	Employee Share	Employer Share	Wage Base
Social Security	6.2%	6.2%	$176,100
Medicare	1.45%	1.45%	No limit
Additional Medicare	0.9% (over $200K)	None	Over $200,000
FUTA	None	0.6% (net)	$7,000

Total employer cost per employee: 7.65% + 0.6% = 8.25% of wages (plus state unemployment, workers’ comp)

Deposit schedule (which one applies to you):

Monthly depositor: payroll tax liability under $50,000 in the lookback period; deposit by the 15th of the following month
Semi-weekly depositor: liability over $50,000 in the lookback period; deposit within 3 business days after payday
Next-day deposit: if you accumulate $100,000+ in tax liability on any day, deposit the next business day
Quarterly with Form 941: ONLY if total tax is under $2,500 for the quarter (very small payrolls)

Form 941 (quarterly):

Due: April 30, July 31, October 31, January 31
Reports: total wages, federal income tax withheld, Social Security and Medicare taxes
Reconciles deposits made during the quarter
If deposits match the liability: balance due is $0
If under-deposited: balance due with the return (and possible penalty)

Form 940 (annual, FUTA):

Due: January 31 (if all FUTA deposits were made on time; otherwise February 10)
Reports: total wages subject to FUTA, FUTA tax calculated
Most small businesses pay $42 per employee per year in FUTA (0.6% x $7,000)

Penalties:

Violation	Penalty
1-5 days late deposit	2% of undeposited amount
6-15 days late	5%
16+ days late	10%
After IRS notice	15%
Late Form 941 filing	5% of unpaid tax per month (up to 25%)
Late W-2/W-3	$60-$310 per form (same as 1099 penalties)
Trust Fund Recovery Penalty	100% of the trust fund taxes (personal liability)

What does payroll tax compliance look like?

Hypothetical example

Round numbers. A small business (S-Corp) with 3 employees and the owner. Biweekly payroll.

Payroll per period (biweekly):

Person	Gross Pay	Federal W/H	SS (6.2%)	Medicare (1.45%)	Net Pay
Owner	$2,500	$350	$155	$36	$1,959
Employee 1	$1,750	$200	$109	$25	$1,416
Employee 2	$1,500	$150	$93	$22	$1,235
Employee 3	$1,250	$100	$78	$18	$1,054
Total	$7,000	$800	$434	$102	$5,664

Employer’s matching share:

SS match: $434
Medicare match: $102
Total employer FICA: $536

Total deposit per pay period: $800 (W/H) + $434 (employee SS) + $102 (employee Med) + $536 (employer match) = $1,872

Monthly total: approximately $3,744 (2 pay periods per month, roughly)

This business is a monthly depositor (under $50,000 in the lookback period). Deposits are due by the 15th of the following month.

Annual payroll tax cost to the employer:

Item	Annual Cost
Employer FICA (SS + Med)	$13,936
FUTA (0.6% x $7,000 x 4 employees)	$168
State unemployment (estimated 3% x $7,000 x 4)	$840
Workers’ comp (estimated, varies by industry)	$2,000-$8,000
Payroll service (ADP, Gusto, etc.)	$600-$2,400
Total employer payroll cost	$17,544-$25,344

On $182,000 in annual gross wages (including owner): the employer taxes add 9.6-13.9% on top.

The Trust Fund Recovery Penalty in action: The business falls behind on payroll deposits. Over 3 quarters, it accumulates $15,000 in undeposited payroll taxes.

The IRS sends notices (Letter 3164, Notice CP504)
The business still doesn’t pay
Revenue Officer is assigned
The officer assesses the Trust Fund Recovery Penalty against the owner PERSONALLY
The owner now owes $15,000 personally (the “trust fund” portion: the employee’s withheld taxes, not the employer match)
This debt is NOT dischargeable in bankruptcy
The IRS can levy the owner’s personal bank accounts, garnish wages from other employment, and file tax liens against personal property

This is the single most aggressive collection tool the IRS has. It exists because the withheld taxes belong to the employees (they’re credits on the employees’ tax returns), and using those funds for business operations is effectively embezzlement from the employees’ tax payments.

Payroll service options:

Service	Monthly Cost	Includes
Gusto	$40 + $6/employee	Full payroll, deposits, 941/940, W-2, direct deposit
ADP Run	$59 + $4/employee	Full payroll, deposits, filings, HR tools
QuickBooks Payroll	$45 + $6/employee	Integrated with QBO, full service
Square Payroll	$35 + $6/employee	Good for retail/service businesses
DIY (manual)	$0	You calculate, deposit, and file everything yourself

For a 4-person payroll: $64-$83/month ($768-$996/year) for a full-service provider. Compared to the penalty risk of doing it wrong ($15,000+ in trust fund penalties), the payroll service is one of the highest-value expenses any small business can incur.

Never skip a payroll deposit. If cash is tight, pay the IRS before paying other bills. Vendors can wait; the IRS cannot. The trust fund penalty makes this the one obligation that can personally ruin the business owner.

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

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Cite this page

Yarik Yarosh, CPA. "Payroll Tax Basics: Form 941, Form 940, and Employer Tax Obligations." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-payroll-tax-basics-form-941-940

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