Do You Need to File 941s or 940s with 1120S? Payroll Tax Overview (2025)

If you own an S Corporation, you are likely familiar with the annual March deadline for Form 1120-S. However, many business owners—especially those new to the S Corp election—mistakenly believe this single income tax return covers all their obligations. This misconception can lead to severe penalties.

The reality is that if your S Corp has employees (including yourself), you almost certainly need to file Forms 941 and 940.

Because S Corporations are “pass-through” entities, the IRS requires a strict separation between business profits (distributions) and compensation for services (wages). This triggers payroll tax requirements that are completely separate from your income tax return. This guide provides a deep dive into your payroll obligations for the 2025 tax year, ensuring you stay compliant and avoid IRS scrutiny.

Key Takeaways

• Shareholders are Employees: If you perform services for your S Corp, you must be paid a “reasonable salary” (W-2 wages), which triggers payroll tax filings.
• Form 941 is Quarterly: You must file this form four times a year to report federal income tax withholding, Social Security, and Medicare taxes.
• Form 940 is Annual: This form reports Federal Unemployment Tax (FUTA) and is generally due by January 31 (February 2 for the 2025 tax year).
• 2025 Wage Base Increase: The Social Security wage base has increased to $176,100 for 2025.
• Zero Salary Risk: Taking 100% of your compensation as distributions to avoid payroll taxes is a primary audit trigger for S Corps.

The “Reasonable Salary” Rule: Why You Can’t Ignore Payroll

The bridge between your S Corp’s income tax return (Form 1120-S) and payroll tax forms (941/940) is the Shareholder-Employee rule. Unlike sole proprietors, who cannot pay themselves a salary, S Corp owners who work in the business must be classified as employees.

The IRS requires you to pay yourself a “reasonable salary” before taking any tax-advantaged distributions. This salary is subject to FICA taxes (Social Security and Medicare) and income tax withholding, which must be reported on Form 941 and Form 940.

The “Zero Salary” Trap

A common, dangerous strategy is paying yourself $0 in wages and taking $100,000 in distributions to save on the 15.3% self-employment tax. The IRS has explicitly targeted this practice. If audited, they can reclassify your distributions as wages, assessing back taxes, penalties, and interest.

Form 941: The Quarterly Federal Tax Return

Form 941 is the workhorse of payroll reporting. It is used to report:

• Wages you have paid.
• Federal income tax you withheld.
• Social Security and Medicare taxes (both the employer and employee portions).

2025 Tax Year Specifics

For 2025, you need to be aware of updated thresholds:

• Social Security Wage Base: The 6.2% tax applies to the first $176,100 of wages paid to each employee. Earnings above this amount are exempt from the Social Security portion of the tax.
• Medicare Tax: The 1.45% tax applies to all wages with no cap.
• Additional Medicare Tax: You must withhold an extra 0.9% on wages paid to an employee in excess of $200,000.

2025 Filing Deadlines for Form 941

Form 941 is due by the last day of the month following the end of the quarter. However, if a deadline falls on a weekend or holiday, it moves to the next business day. Note the shift for Q4 2025.

Quarter	Period Covered	Filing Deadline	Extended Deadline*
Q1	Jan 1 – Mar 31, 2025	April 30, 2025	May 12, 2025
Q2	Apr 1 – Jun 30, 2025	July 31, 2025	August 11, 2025
Q3	Jul 1 – Sep 30, 2025	October 31, 2025	November 10, 2025
Q4	Oct 1 – Dec 31, 2025	February 2, 2026	February 10, 2026

*The extended deadline applies only if you have deposited all taxes in full and on time during the quarter.

Form 940: The Annual FUTA Return

Form 940 reports your Federal Unemployment Tax Act (FUTA) liability. Unlike FICA, only the employer pays this tax; it is never deducted from employee wages.

• Tax Rate: The FUTA tax rate is 6.0%.
• Wage Base: It applies only to the first $7,000 paid to each employee per year.
• State Credit: Most employers receive a credit of 5.4% for paying state unemployment taxes on time, reducing the effective FUTA rate to 0.6% (or $42 per employee per year).

2025 Filing Deadline for Form 940

For the 2025 tax year, Form 940 is due on February 2, 2026 (since January 31 falls on a Saturday). If you have deposited all FUTA taxes when due, you may file by February 10, 2026.

Pro Tip (New for 2025): Under Executive Order 14247, the IRS is modernizing payments. You can now generally receive Form 940 refunds via direct deposit, a change aimed at improving operational efficiency.

How Payroll Forms Interact with Form 1120-S

It is vital to understand that these forms “talk” to each other. Your 1120-S return must reflect the reality reported on your 941s and 940.

1. Deductibility: The employer portion of Social Security, Medicare, and FUTA taxes reported on Forms 941 and 940 are deductible business expenses. These are typically claimed on Form 1120-S, Line 12 (Taxes and Licenses).
2. Officer Compensation: Line 7 of Form 1120-S asks for “Compensation of officers.” The figure entered here should generally align with the W-2 wages issued to shareholder-employees. A mismatch here (e.g., high distributions on the K-1 but zero officer compensation) is a red flag.

Real-World Scenarios

To help you determine your specific requirements, consider these common scenarios for the 2025 tax year.

Scenario A: The Solo S Corp Owner

Situation: You are the only worker in your S Corp. You made $150,000 in profit.
Requirement: You must determine a reasonable salary (e.g., $80,000). You must file Form 941 quarterly to report withholding on that $80,000 and Form 940 annually. The remaining $70,000 can be taken as distributions without payroll taxes.

Scenario B: The Seasonal Business

Situation: You run a landscaping S Corp that only operates from April to October.
Requirement: You still generally need to file Form 941 for all four quarters. For the off-season quarters (Q1 and Q4), you may file a “zero return” to keep the IRS informed that you are still in business but paid no wages. Alternatively, if you marked the “Seasonal Employer” box on a previous 941, you might not need to file for quarters with no wages, but filing zero returns is often safer to prevent automated non-filing notices.

Scenario C: The “Inactive” S Corp

Situation: You incorporated an S Corp but had zero business activity and paid zero wages in 2025.
Requirement: You must still file Form 1120-S (due March 16, 2026). However, if you have paid no wages to anyone (including yourself), you generally do not need to file Form 941 or 940, provided you haven’t previously filed them and established an expectation with the IRS. If you have an active payroll account, it is best to file “zero” returns or formally close the payroll account to avoid confusion.

Common Pitfalls & Mistakes

1. Late Deposits

Filing the form on time is not enough; you must also deposit the taxes on time.
Monthly Depositors: If your tax liability is under $50,000 for the lookback period, you must deposit taxes by the 15th of the following month.
Semi-Weekly Depositors: If liability is higher, you must deposit within days of the payroll date.
Penalty: Penalties for late deposits range from 2% to 15% depending on how late the payment is.

2. Misclassifying Owners as Contractors

You cannot issue yourself a 1099-NEC from your own S Corporation to avoid payroll taxes. Officers are statutory employees. This is an automatic misclassification if discovered.

3. Ignoring State Payroll Taxes

Filing Federal Forms 941 and 940 is only half the battle. You almost certainly have state income tax withholding and State Unemployment Insurance (SUI) filing requirements. Failing to pay SUI can disqualify you from the 5.4% FUTA credit, effectively increasing your federal tax bill tenfold.

FAQ

Q: Can I file Form 944 instead of 941?
A: Only if the IRS explicitly notifies you in writing. Form 944 is an annual replacement for the quarterly 941, generally reserved for very small employers with an annual liability of $1,000 or less. Do not file Form 944 unless instructed to do so.

Q: What is the deadline for filing Form 1120-S for 2025?
A: The deadline is March 16, 2026 (because March 15 falls on a Sunday). You can request an automatic 6-month extension using Form 7004.

Q: Do I need to file Form 940 if I have no employees?
A: Generally, no. Form 940 is required only if you paid wages of $1,500 or more in any calendar quarter or had one or more employees for at least some part of a day in any 20 or more different weeks.

Q: Can I file these forms electronically?
A: Yes, and it is highly encouraged. The IRS mandates e-filing for S Corporations filing 10 or more returns of any type (e.g., W-2s, 1099s, 941s, 1120-S) in a calendar year.

Conclusion

While the Form 1120-S handles your income tax, Forms 941 and 940 are the engines that keep your business compliant with employment laws. For S Corporation owners, the requirement to pay a reasonable salary makes these forms virtually mandatory. By marking your calendar for the 2025 deadlines—especially the February 2, 2026, due date for the annual 940 and Q4 941—you can protect your business from avoidable penalties and keep your S Corp status secure.