How to Pay Small Business Taxes: Methods, Deadlines, and Penalties

To pay small business taxes at the federal level, you make quarterly estimated tax payments during the year and file an annual return by your entity’s deadline, paying any remaining balance at that time. Most payments go through the Electronic Federal Tax Payment System (EFTPS) or, for individual owners of pass-through businesses, IRS Direct Pay. The exact forms, thresholds, and dates depend on how your business is organized and whether you have employees.

What You Owe Depends on Your Structure

Before you can pay, you need to know what you’re paying and on which form.

Sole proprietors and single-member LLCs report business profit or loss on Schedule C attached to their personal Form 1040.1Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship) You owe regular income tax on the profit plus self-employment tax of 15.3% on net earnings (12.4% Social Security, 2.9% Medicare).2Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax The Social Security portion applies only to the first $184,500 of net self-employment income in 2026.3Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet Medicare has no cap, and an extra 0.9% Medicare tax kicks in above $200,000 ($250,000 joint). You can deduct the employer-equivalent half of self-employment tax when calculating adjusted gross income.4Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)

Partnerships file Form 1065 as an information return and issue each partner a Schedule K-1; partners pay tax on their share on their personal returns.5Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income S corporations file Form 1120-S and issue K-1s to shareholders.6Internal Revenue Service. About Form 1120-S, U.S. Income Tax Return for an S Corporation C corporations file Form 1120 and pay a flat 21% federal income tax at the entity level.7Office of the Law Revision Counsel. 26 USC 11 – Tax Imposed

You’ll also need an Employer Identification Number to file most business returns and make electronic payments. You can apply online at IRS.gov and receive one immediately at no cost.8Internal Revenue Service. Get an Employer Identification Number

Quarterly Estimated Payments Come First

The IRS expects you to pay tax as you earn it, not in one payment at filing time. You generally must make estimated payments if you expect to owe $1,000 or more when you file. For C corporations, the threshold is $500.9Internal Revenue Service. Estimated Taxes

The four due dates are:

  • April 15, covering income earned January through March
  • June 15, covering income earned April through May
  • September 15, covering income earned June through August
  • January 15 of the following year, covering income earned September through December

If a due date lands on a weekend or holiday, the deadline moves to the next business day.10Internal Revenue Service. When Are Quarterly Estimated Tax Payments Due?

Two safe harbors keep you clear of underpayment penalties. You’re generally safe if your estimated payments and any withholding cover at least 90% of the current year’s tax, or 100% of the prior year’s tax (110% if your adjusted gross income exceeded $150,000).11Internal Revenue Service. Estimated Tax The prior-year safe harbor is the practical choice in a first full year because projecting current income accurately is hard. Miss the safe harbors and the IRS charges interest at the federal short-term rate plus three percentage points, which was 7% in early 2026.12Internal Revenue Service. Quarterly Interest Rates

Annual Return Deadlines

Your annual return closes out the year and reconciles what you already paid against what you actually owe. For calendar-year 2026 filings:

Partnerships, S corporations, and C corporations can file Form 7004 for an automatic six-month extension. Sole proprietors use Form 4868 on their personal return. An extension to file is not an extension to pay: any tax owed is still due on the original date, and interest and penalties begin accruing immediately on unpaid balances even when the filing extension is approved.14Internal Revenue Service. Instructions for Form 7004

How to Submit the Payment

Most business tax payments now move electronically. The right channel depends on whether you’re paying as a business entity or as an individual owner reporting pass-through income.

EFTPS for Business Payments

The Electronic Federal Tax Payment System (EFTPS) is the government’s portal for business tax payments. You can schedule income tax, employment tax, estimated tax, and excise tax payments up to 365 days in advance.15Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System All federal tax deposits, including payroll taxes and corporate estimated payments, must be made electronically, and EFTPS is the primary tool for that. Enrollment takes several days because the IRS mails you a PIN, so set up your account well before your first payment is due.

Direct Pay for Individual Owners

If you’re paying estimated taxes on pass-through income through your personal 1040, IRS Direct Pay transfers funds straight from a checking or savings account with no enrollment.16Internal Revenue Service. Direct Pay With Bank Account Sole proprietors and single-member LLCs commonly use this route for their quarterly payments.

Paying by Mail

Paper checks are still accepted for many payments. Use the regional processing center address listed in the instructions for your form, and consider certified mail with return receipt. Under the “mailbox rule,” a return postmarked by the due date counts as filed on time even if it arrives later.17Office of the Law Revision Counsel. 26 USC 7502 – Timely Mailing Treated as Timely Filing and Paying Write your EIN, tax form number, and tax year on the memo line. Any mismatch with your return causes processing delays.

Track What You’ve Paid

Electronic payments produce a confirmation number at the moment of submission. Save it. For mailed payments, keep the certified mail receipt and canceled check. The IRS Business Tax Account portal lets authorized users see the total balance owed, view year-by-year detail, and pull transcripts; checking it after each payment catches discrepancies before they turn into notices.18Internal Revenue Service. Business Tax Account Hold on to payment records for at least three years from the filing date, the standard IRS audit window. If you underreport income by more than 25%, the window extends to six years.19Internal Revenue Service. How Long Should I Keep Records?

Payroll Tax Payments if You Have Employees

Once you hire, a separate payment stream begins. You withhold federal income tax and FICA from employee wages, and you match the FICA share: 6.2% for Social Security (up to the $184,500 wage base) and 1.45% for Medicare, with no cap on Medicare wages.20Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates Deposits go through EFTPS on either a monthly or semiweekly schedule set by the IRS based on your prior payroll history.

You report these taxes quarterly on Form 941, due by the last day of the month following each quarter: April 30, July 31, October 31, and January 31.21Internal Revenue Service. Instructions for Form 941 Once you start filing 941s, you must file every quarter, even if you paid no wages, unless you notify the IRS you’ve permanently stopped paying wages.

Withheld payroll taxes are treated as trust fund money. If your business fails to deposit them, the IRS can assess a Trust Fund Recovery Penalty equal to 100% of the unpaid amount and collect it from you personally, even if your business is an LLC or corporation.22Internal Revenue Service. Employment Taxes and the Trust Fund Recovery Penalty (TFRP) Your entity does not shield you from this one.

If you paid an independent contractor $2,000 or more during the year, file Form 1099-NEC for that person. The threshold rose from $600 to $2,000 for tax years beginning after 2025 and will adjust for inflation going forward.23Internal Revenue Service. Publication 1099 General Instructions for Certain Information Returns (2026) If you file 10 or more information returns of any type, you must file electronically.24Internal Revenue Service. General Instructions for Certain Information Returns (2025)

What Late Payment Actually Costs

The IRS charges separate penalties for filing late and paying late, and they stack.

The failure-to-file penalty is 5% of the unpaid tax per month or partial month, capped at 25%.25Internal Revenue Service. Failure to File Penalty The failure-to-pay penalty is 0.5% per month, also capped at 25%.26Internal Revenue Service. Failure to Pay Penalty When both apply in the same month, the filing penalty is reduced by the payment penalty, so you pay 5% total for the first five months. After the filing penalty maxes out, the payment penalty keeps running. Interest at the federal short-term rate plus three percentage points accrues on the whole balance.

The math is one-sided: filing on time and owing money costs 0.5% per month, while not filing at all costs 5% per month, ten times more. Always file, even if you can’t pay in full. Setting up an IRS payment plan drops the failure-to-pay rate to 0.25% per month during the plan.26Internal Revenue Service. Failure to Pay Penalty

If the IRS determines you owe after processing your return, you’ll typically receive Notice CP14 stating the amount due with interest and penalties, and asking for payment within 21 days.27Internal Revenue Service. Understanding Your CP14 Notice Respond quickly, whether by paying, requesting a plan, or disputing the amount. Ignoring it lets the balance escalate into liens or levies against business and personal assets.

State and Local Taxes Are Separate

The steps above cover federal tax only. Most states impose their own income tax on business earnings, and the filing process varies. Some states mirror federal pass-through treatment, others impose entity-level taxes on partnerships and S corporations. States and localities may also charge sales tax, franchise tax, gross receipts tax, business privilege tax, or annual report fees, with amounts ranging from nothing to several hundred dollars a year. Check with your state’s department of revenue and secretary of state to identify every recurring filing and payment tied to where your business is formed and operates.