Yes, most businesses do file taxes quarterly, but the obligation comes in two separate pieces. Sole proprietors, partners, S corporation shareholders, and C corporations that expect to owe more than a small amount of federal tax send estimated income tax payments four times a year. On top of that, any business with employees files Form 941 each quarter to report payroll taxes. Falling behind on either one triggers penalties that add up quickly.
Who Owes Quarterly Estimated Income Tax
The federal tax system is pay-as-you-go. If your income isn’t subject to paycheck withholding, the IRS expects you to estimate what you’ll owe and send money in during the year rather than settling up only at filing time.
For sole proprietors, partners, and S corporation shareholders, the rule is simple: if you expect to owe $1,000 or more in federal tax for the year after any withholding and refundable credits, you need to make estimated quarterly payments.1Internal Revenue Service. Frequently Asked Questions – Estimated Tax for Individuals Because these entities pass income through to the owners’ personal returns, the obligation sits with you as an individual.
C corporations have a lower bar. A corporation must make estimated payments if it expects to owe $500 or more in tax for the year.2Internal Revenue Service. Underpayment of Estimated Tax by Corporations Penalty
If you’re a pass-through owner, your estimated payments need to cover self-employment tax as well as income tax. Self-employment tax funds Social Security and Medicare and runs 15.3% combined (12.4% Social Security plus 2.9% Medicare), because you’re treated as both employer and employee.3Internal Revenue Service. Self-Employment Tax, Social Security, and Medicare Taxes The Social Security portion applies only to net earnings up to $184,500 in 2026.4Social Security Administration. Contribution and Benefit Base Earnings above that still carry the 2.9% Medicare piece.
Quarterly Due Dates
The IRS splits the year into four payment periods that don’t match calendar quarters. For individuals, sole proprietors, partners, and S corporation shareholders, the deadlines are:5Internal Revenue Service. Individuals 2 – When to Pay Estimated Tax
- Q1 (January 1 – March 31): April 15
- Q2 (April 1 – May 31): June 15
- Q3 (June 1 – August 31): September 15
- Q4 (September 1 – December 31): January 15 of the following year
When a due date lands on a weekend or federal holiday, the deadline moves to the next business day. If you file your annual return and pay the full balance by January 31, you can skip the fourth payment.
Calendar-year C corporations are on a different Q4 schedule. Their estimated installments are due April 15, June 15, September 15, and December 15, with no January option.
How Much to Send Each Quarter
Getting the amount right matters because the IRS charges interest on underpayments. Two “safe harbor” methods protect you from the penalty even if you end up owing more than you planned.
Base It on Last Year’s Tax
The simpler safe harbor is to pay 100% of the total tax from your prior-year return, split into four installments. If your prior-year adjusted gross income was over $150,000 ($75,000 if married filing separately), the threshold rises to 110%.1Internal Revenue Service. Frequently Asked Questions – Estimated Tax for Individuals This is the default approach for established businesses because the number is already on your last return. Divide and pay.
Base It on This Year’s Projected Tax
The other safe harbor is paying at least 90% of what you’ll actually owe for the current year.6Internal Revenue Service. Topic No. 306 – Penalty for Underpayment of Estimated Tax This works if your income is lower than last year or you can forecast it accurately. For newer businesses and anyone with volatile revenue, the forecasting part is the hard part.
Seasonal Income
If your revenue is concentrated in part of the year, the annualized income installment method lets you size each payment to the income actually earned through the end of that period. A landscaper who earns most of their money between May and October would pay less in Q1 and more later. You document the uneven payments by filing Form 2210 (Schedule AI) with your annual return.7Internal Revenue Service. Form 2210 – Underpayment of Estimated Tax by Individuals, Estates, and Trusts
Adjusting Mid-Year
If your income shifts after you’ve already made a payment or two, redo the Form 1040-ES worksheet and recalculate the remaining quarters.8Internal Revenue Service. Estimated Taxes This is where people trip up. A strong Q3 can create an underpayment unless you raise your Q4 to catch up.
How to Submit the Payment
Sole proprietors and other pass-through owners use Form 1040-ES vouchers to pay by mail.9Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals Corporations use Form 1120-W as an internal worksheet; the form itself is never sent to the IRS, and corporate estimated payments must be made electronically.10Internal Revenue Service. Instructions for Form 1120-W
The Electronic Federal Tax Payment System (EFTPS) is the main electronic option and is required for corporations. It’s free, open around the clock, and lets you schedule payments up to 365 days ahead.11Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System One deadline detail catches people out: EFTPS payments must be scheduled by 8 p.m. ET the day before the due date to count as timely. Waiting until the day itself is too late.
Individuals can also use IRS Direct Pay, which debits a bank account directly.12Internal Revenue Service. Direct Pay with Bank Account Direct Pay isn’t available for corporate tax payments.
If You Have Employees: Form 941
Payroll taxes are a completely separate quarterly obligation. Every quarter, employers file Form 941 to report federal income tax withheld from employees plus the combined employee and employer shares of Social Security and Medicare taxes.13Internal Revenue Service. About Form 941, Employer’s Quarterly Federal Tax Return The employer’s share of FICA is 7.65% of wages (6.2% Social Security, 1.45% Medicare), matching what you withhold from the paycheck.14Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
Form 941 is due by the last day of the month after each quarter ends:15Internal Revenue Service. Employment Tax Due Dates
- Q1 (January – March): April 30
- Q2 (April – June): July 31
- Q3 (July – September): October 31
- Q4 (October – December): January 31 of the following year
Once you’ve filed your first 941, the IRS expects one every quarter after that, even in quarters when you paid no wages. The exceptions are seasonal employers (who check the seasonal box on line 18), employers filing a final return at closure, and businesses the IRS has moved to the annual Form 944.16Internal Revenue Service. Instructions for Form 941 (03/2026)
Payroll Deposits Are More Frequent Than the Filing
Filing 941 four times a year does not mean you only hand over payroll taxes four times a year. The IRS assigns a deposit schedule based on the size of your payroll tax liability, and it runs faster than quarterly. Monthly depositors remit accumulated payroll taxes by the 15th of the following month.17Internal Revenue Service. Notice 931 – Deposit Requirements for Employment Taxes Larger employers are placed on a semi-weekly schedule tied to each payday.15Internal Revenue Service. Employment Tax Due Dates
Missing a deposit gets expensive fast. The failure-to-deposit penalty is tiered by how late the money arrives:18Internal Revenue Service. Failure to Deposit Penalty
- 1–5 days late: 2% of the unpaid deposit
- 6–15 days late: 5%
- More than 15 days late: 10%
- After the first IRS notice or demand for immediate payment: 15%
The tiers don’t stack. If you’re 20 days late, you owe 10%, not 2% plus 5% plus 10%.
The Trust Fund Trap
The income tax and employee FICA you withhold from paychecks are trust fund taxes: the money belongs to the government and you’re holding it temporarily. If the business doesn’t deposit it, the IRS can assess the Trust Fund Recovery Penalty against any “responsible person” who willfully failed to pay. The penalty equals the full unpaid trust fund amount plus interest.19Internal Revenue Service. Trust Fund Recovery Penalty
A responsible person can be an officer, partner, sole proprietor, or any employee with authority over the business’s finances. “Willfully” doesn’t require bad intent. Choosing to pay vendors or rent instead of depositing payroll taxes counts.19Internal Revenue Service. Trust Fund Recovery Penalty This penalty cuts through the liability shield of an LLC or corporation and reaches the individuals who ran the money.
FUTA: Reported Annually, Deposited Quarterly
Federal unemployment tax is 6% on the first $7,000 of each employee’s annual wages. Most employers qualify for a credit of up to 5.4% for paying state unemployment taxes on time, bringing the effective federal rate to 0.6%.20Internal Revenue Service. Instructions for Form 940 You report FUTA annually on Form 940, usually due January 31. The deposit, though, is quarterly whenever cumulative FUTA liability tops $500. If the quarter’s liability is $500 or less, you roll it into the next quarter until the threshold is crossed.21Internal Revenue Service. Topic No. 759, Form 940, Employer’s Annual Federal Unemployment Tax Return For any business with a real workforce, that threshold hits quickly, so FUTA tends to function as another quarterly deposit.
State Taxes Are a Separate Question
Federal rules are only half of it. Most states with an income tax require their own quarterly estimated payments from self-employed individuals and pass-through owners, on schedules close to the federal one. States with employees require their own payroll filings, often quarterly, along with state unemployment contributions. Sales tax filing frequency depends on volume: higher-volume businesses may file monthly, smaller ones quarterly or annually. Check your state department of revenue for the specifics.