The first question is which deposit schedule the business is on. Under 26 CFR 31.6302-1(b) the determination is annual and rests on a lookback period. For an employer filing quarterly Forms 941, "the lookback period for each calendar year is the twelve month period ended the preceding June 30." For an employer filing the annual Form 944, the lookback period is the second calendar year preceding the current one. Then:
- Monthly depositor. "An employer is a monthly depositor for the entire calendar year if the aggregate amount of employment taxes reported for the lookback period is $50,000 or less" (31.6302-1(b)(2)(i)). Deposits are due "by the 15th day of the following month" for taxes accumulated during a calendar month.
- Semi-weekly depositor. An employer whose lookback-period total "exceeds $50,000" is semi-weekly for the whole year (31.6302-1(b)(3)). Taxes on payments made Wednesday, Thursday or Friday are due the following Wednesday; taxes on payments made Saturday through Tuesday are due the following Friday. A semi-weekly depositor always gets at least three business days after the close of the period, and an additional day for each legal holiday falling in them.
A new employer is treated as having reported zero employment taxes for any part of the lookback period before it existed, so it starts as a monthly depositor.
One rule overrides both schedules. 26 CFR 31.6302-1(c)(3), the One-Day rule: "if on any day within a deposit period (monthly or semi-weekly) an employer has accumulated $100,000 or more of employment taxes, those taxes must be deposited ... in time to satisfy the tax obligation by the close of the next day." Tripping it also has a lasting consequence for a monthly depositor, which "ceases to be a monthly depositor on the first day after the employer is subject to the One-Day ($100,000) rule" and immediately becomes a semi-weekly depositor for the rest of that year and the following one.
The smallest employers can skip deposits entirely. Under the de minimis rule in 31.6302-1(f)(4), where the total accumulated employment taxes for a return period are "less than $2,500 for the return period" and the amount is fully paid with a timely filed return, it is deemed timely deposited. A parallel rule looks to the immediately preceding quarter. So a very small employer may be able to remit with the quarterly return rather than running a deposit calendar, which is worth checking before buying a service that assumes otherwise.
The penalty is graduated, and it is a percentage of the deposit. Internal Revenue Code section 6656(a) imposes a penalty "equal to the applicable percentage of the amount of the underpayment" unless the failure is due to reasonable cause. Section 6656(b)(1)(A) sets the applicable percentage at "2 percent if the failure is for not more than 5 days," "5 percent if the failure is for more than 5 days but not more than 15 days," and "10 percent if the failure is for more than 15 days." Under 6656(b)(1)(B) it becomes 15 percent once the tax is still undeposited ten days after a first delinquency notice, or after a demand for immediate payment. There is a first-time forgiveness: section 6656(c) allows the Secretary to waive the penalty for an inadvertent failure occurring in the first quarter the person was required to deposit employment tax, or on the first deposit after a required change in deposit frequency, subject to conditions.
A small mistake is also forgiven by rule rather than by discretion: 31.6302-1(f)(1) treats the obligation as satisfied where the shortfall "does not exceed the greater of $100 or 2 percent of the amount of employment taxes required to be deposited" and the shortfall is deposited by the make-up date.
The filing rhythm sits on top of the deposit calendar. Most employers file Form 941, which the regulation names as the "Employer's QUARTERLY Federal Tax Return," four times a year. Certain small employers are instead directed to file Form 944, the "Employer's ANNUAL Federal Tax Return." Federal unemployment tax is reported annually on Form 940, and each employee receives a Form W-2 after year end. Which taxes those returns actually report is treated on our payroll taxes page.
Outsourcing does not transfer the obligation. A payroll service provider or reporting agent can compute, file and deposit on an employer's behalf, and most small employers use one. The employer nonetheless remains the taxpayer responsible for the deposits, which is why the two protective habits worth building are enrolling in the Electronic Federal Tax Payment System in the employer's own name so deposits can be verified independently, and keeping the IRS address on file as the employer's own rather than the provider's so notices arrive.