Form 941 due dates: a payroll calendar for firms

When is Form 941 due each quarter?

Form 941 is filed by the last day of the month after each calendar quarter ends. The Instructions for Form 941 set out four dates: April 30 for January to March, July 31 for April to June, October 31 for July to September and January 31 for October to December.

There is a built-in grace period. If the client made timely deposits in full payment of the quarter's taxes, the return can be filed by the 10th day of the second month after the quarter ends, so May 10, August 10, November 10 and February 10. That extra time is earned by depositing on schedule, not requested, so a single late deposit removes it.

When any filing date lands on a Saturday, Sunday or legal holiday, the return is due on the next business day. That matters for the coming crunch: January 31, 2027 is a Sunday, so the fourth-quarter 2026 return is due Monday, February 1, 2027, or February 10 for clients whose deposits were all on time.

Most firms already know the four dates. The harder part is that each date depends on client data arriving earlier, and on which deposit schedule the client is on. The rest of this guide works backward from the filing dates to build a calendar your team can run.

Which deposit schedule does each client follow?

Filing the return is the quarterly event, but the deposits are where penalties usually come from. IRS Publication 15 says every employer must work out, before each calendar year begins, whether it is a monthly or semiweekly schedule depositor. The test is the lookback period.

The lookback period

For Form 941 filers, the lookback period is the four quarters running from July 1 to June 30 that end in the year before. For 2026 it covered July 1, 2024 through June 30, 2025. Applying the same rule, a client's 2027 schedule depends on the taxes reported from July 1, 2025 through June 30, 2026.

• $50,000 or less reported in the lookback period: monthly depositor. Taxes on payments made in a month are deposited by the 15th of the following month.
• More than $50,000: semiweekly depositor. Wednesday, Thursday or Friday paydays are deposited by the following Wednesday; Saturday through Tuesday paydays by the following Friday.

Two rules that override the schedule

The $100,000 next-day rule applies to everyone. If a client accumulates $100,000 or more of tax on any day in a deposit period, it is due by the next business day. A monthly depositor that trips this rule becomes a semiweekly depositor from the next day, for the rest of that year and the whole following year.

At the other end, a client whose Form 941 line 12 for the current or prior quarter is under $2,500, with no $100,000 next-day obligation in the quarter, may pay with a timely filed return instead of depositing. Check Publication 15 for the detail before relying on it for a borderline client.

How do you run the lookback calculation for a client?

Here is an illustrative example with made-up figures. Harbor Street Bakery, a client with 14 staff, needs a 2027 deposit schedule. The firm pulls line 12 (total taxes after adjustments) from its last four Forms 941 that fall inside the lookback window.

1. Q3 2025: $11,200
2. Q4 2025: $12,900 (holiday staffing)
3. Q1 2026: $12,400
4. Q2 2026: $14,100

The total is $50,600. That is $600 over the threshold, so Harbor Street becomes a semiweekly depositor for 2027 even though it was monthly in 2026. Its Friday payroll on January 8, 2027 must now be deposited by Wednesday, January 13, rather than with the other January taxes in mid-February.

A second illustrative client, a two-person design studio reporting $9,000 a quarter, totals $36,000 and stays monthly. The lesson is that growth clients cross the line quietly. A bakery that added a few seasonal hires would not think to tell you, and the payroll software may not flag it until a deposit is already late.

Run this check for every payroll client in November, record the result on the client record, and tell the client in writing if their schedule changes. It takes minutes per client and is the single best defence against the 2% and 5% penalty tiers.

What else is due in the January 2027 crunch?

Form 941 does not arrive alone. Because January 31, 2027 is a Sunday, several annual filings stack up on Monday, February 1, 2027.

• Forms W-2 and W-3. The 2026 Instructions for Forms W-2 and W-3 say Copies B, C and 2 go to employees, and Copy A with Form W-3 goes to the SSA, by February 1, 2027. Extensions are limited and are not automatic.
• Form 940. The annual FUTA return is due January 31, which shifts to February 1, 2027 for the 2026 year. If all FUTA tax was deposited when due, the Form 940 instructions allow until the 10th, so February 10, 2027.
• Form 944. Small employers the IRS has told in writing to file annually use Form 944 instead of four Forms 941. It follows the same January 31 date and 10-day rule. Employers expecting $1,000 or less in employment taxes can ask to switch, but only file 944 after written IRS approval.

FUTA deposits in brief

FUTA is 6.0% on the first $7,000 paid to each employee, and most employers get a credit of up to 5.4%. If a quarter's FUTA liability is $500 or less, it carries forward; once the running total exceeds $500, deposit it by the last day of the month after the quarter. Credit reduction states can raise the bill, so check Schedule A each year.

What does a payroll compliance calendar look like for firms?

The table below maps the next six months for a typical book of small-business payroll clients. Dates already reflect weekend shifts we checked against the 2027 calendar; confirm against IRS.gov before you publish it to staff, as holidays and IRS relief can move dates.

Treat the 10-day dates as a buffer, not a target. If even one semiweekly deposit slipped, the client loses the extra time and the earlier date applies.

How should firms collect payroll data from clients each quarter?

Most late 941s trace back to a missing input, not a missed date. A client who runs payroll in-house but hires you to file needs to hand over the same items every quarter, and they rarely remember them unprompted.

The quarterly request

• Payroll registers for every pay date in the quarter, including off-cycle and bonus runs
• Deposit confirmations, or bank statements showing each federal tax payment
• New hires, leavers and any change of address or name
• Tips reported by employees, sick pay from third parties and fringe benefits
• Any IRS notices received since the last quarter

Send the request on the first business day after the quarter closes, then chase on day 7 and day 12. A request on April 1 with a firm cut-off of April 15 leaves two weeks to reconcile and file by April 30 with room for questions.

Reconciliation is the step that protects the client. Match total liability from the registers to deposits made, by month for monthly depositors and by pay date for semiweekly ones. A gap of even a few hundred dollars is worth a call before you file, because a short deposit can be penalised even when the return is right. If you also bill quarterly for this work, a recurring invoice setup keeps fees aligned with the filing cycle.

What are the penalties for late Form 941 deposits?

Publication 15 sets out tiered failure-to-deposit penalties, counted in calendar days from the due date:

• 2% for deposits 1 to 5 days late
• 5% for deposits 6 to 15 days late
• 10% for deposits 16 or more days late, and for amounts paid directly to the IRS or with the return rather than deposited (with limited exceptions)
• 15% for amounts still unpaid more than 10 days after the first IRS notice or demand

The tiers explain why the lookback check matters. In the illustrative bakery example, a client who kept depositing monthly after becoming semiweekly would miss a Wednesday deadline by weeks, landing straight in the 10% tier on that deposit. Separate penalties can apply for late filing and late payment, and interest runs on top.

Penalty relief may be available for reasonable cause or first-time abatement, but it depends on the facts. Check the current IRS guidance or a payroll tax professional before advising a client on abatement.

How Zaquil handles quarterly payroll compliance for client firms

In practice, the calendar above becomes a set of jobs. In Zaquil we set up a recurring payroll job per client, built from a template with a checklist: request data, reconcile deposits, file 941, confirm acceptance. Each quarter the job appears on the kanban board automatically, and the filing date sits in deadlines so nobody works from memory.

The client sees a request in their branded secure portal: upload this quarter's payroll registers and deposit confirmations, and answer a short questionnaire about new hires, leavers and bonuses. Nothing arrives as an email attachment, and the November lookback result can go out as a letter they approve and e-sign, so there is a signed PDF on file if a schedule change is ever disputed.

Automations do the chasing. When the quarter closes, the request goes out; if nothing is uploaded by day 7, a reminder follows, and on day 12 a task lands with the payroll lead. Replies by email, SMS or WhatsApp all arrive in one inbox against the client record, so the person reconciling sees the whole thread.

Billing follows the same rhythm. A recurring invoice per quarter can be paid online in the portal. See how this fits a tax and bookkeeping practice on our accounting and tax solutions page, or compare plans on pricing. There is a 14-day free trial with no credit card needed to start.