When are my small business tax deadlines?

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Missing a tax deadline can cost penalties and interest. A simple calendar keeps your small business on track.

This guide covers federal income tax deadlines by business type, estimated taxes, payroll and sales taxes, extensions and record keeping. Always confirm dates on IRS.gov and your state tax agency, because due dates can shift for weekends, holidays and disaster relief.

Know your business type

Your business type decides your forms and due dates.

Sole proprietors and single-member LLCs

These usually report business income on Schedule C with Form 1040, generally due in mid-April for calendar-year filers.

Partnerships and multi-member LLCs

These usually file Form 1065, generally due in mid-March for calendar-year filers.

S corporations

These file Form 1120-S, generally due in mid-March for calendar-year filers.

C corporations

These file Form 1120, generally due in mid-April for calendar-year filers.

Estimated taxes

If no one withholds tax from your income, you may need to pay during the year.

Who pays

Self-employed people and some businesses often pay quarterly estimated taxes.

Due dates

Form 1040-ES instructions list the four due dates, generally in April, June, September and January.

Penalties

Underpaying can cause penalties. The IRS explains safe harbor rules.

Payroll taxes

Employers have many deadlines.

Deposits

Employers deposit withheld taxes on a schedule set by the IRS.

Quarterly returns

Form 941 is generally filed quarterly.

Annual forms

W-2 forms go to employees and the Social Security Administration by January 31.

Unemployment tax

Form 940 is filed annually.

Sales tax

Sales tax is set by states and localities.

Registration

If you sell taxable goods or services, you may need to register with your state.

Filing frequency

States assign monthly, quarterly or annual filing.

Online sales

Rules for online sales differ by state.

Information returns

Some payments must be reported.

Form 1099-NEC

Businesses that pay contractors certain amounts generally file Form 1099-NEC by January 31.

Collect W-9s

Ask contractors for Form W-9 before paying them.

Extensions

Extensions give more time to file, not to pay.

How to extend

Businesses use forms such as Form 4868 for individuals or Form 7004 for many business returns.

Pay on time

Estimate and pay what you owe by the original due date.

State and local taxes

States have their own deadlines.

State income tax

Many states have income or franchise taxes.

Annual reports

Many states require annual reports with fees.

Step-by-step: building your tax calendar

Identify your business type

Know which federal forms you file.
List every tax

Include income, estimated, payroll, sales and state taxes.
Look up due dates

Use IRS.gov and your state tax agency.
Put dates on a calendar

Add reminders a week ahead.
Set aside tax money

Move a portion of income into a tax savings account.
Keep records monthly

Update your books each month.
Collect forms early

Collect W-9s from contractors.
Prepare before deadlines

Do not wait until the last day.
Pay electronically

Use IRS Direct Pay or EFTPS for records.
Review yearly

Check for changes each year.

Step-by-step: if you miss a deadline

File as soon as possible

Penalties often grow over time.
Pay what you can

Paying reduces interest.
Check penalty relief

The IRS offers first-time abatement in some cases.
Ask about payment plans

The IRS offers payment plans.
Get help

Talk to a tax professional.

Sample call to a tax professional

An example of questions to ask.

You: I run a small business as a single-member LLC. Which forms do I need to file?

Tax professional: Usually Schedule C with your Form 1040.

You: Do I need to pay estimated taxes?

Tax professional: Likely, if you expect to owe.

You: What records should I keep?

Tax professional: Income, expenses, receipts and mileage logs.

You: Can you help me set up a calendar?

Sample note requesting a W-9

Use this when hiring a contractor.

Subject: Form W-9 request
Hello [Contractor name],
Before I process payment for your work, please complete and return
Form W-9. I need it for my tax records.
You can download the form from IRS.gov.
Thank you,
[Your name]

Example tax calendar (illustrative; confirm dates on IRS.gov)

These are typical federal due dates for calendar-year filers. They can change for weekends, holidays or disaster relief, so always confirm.

Tax item	Typical due date	Who it applies to
W-2 and 1099-NEC	January 31	Employers and businesses paying contractors
Partnership and S corp returns	Mid-March	Form 1065 and 1120-S filers
Individual and C corp returns	Mid-April	Form 1040 and 1120 filers
Estimated tax payment 1	Mid-April	Estimated tax payers
Estimated tax payment 2	Mid-June	Estimated tax payers
Estimated tax payment 3	Mid-September	Estimated tax payers
Estimated tax payment 4	Mid-January	Estimated tax payers

Example monthly budget worksheet (fill in your own numbers)

This blank-style worksheet shows one way to make room for small business tax costs. The sample amounts are examples only; replace them with your own.

Category	Example amount	Your amount
Take-home income	$3,000 (example)	$____
Housing	$1,100 (example)	$____
Utilities and phone	$250 (example)	$____
Food	$450 (example)	$____
Transportation	$300 (example)	$____
Insurance	$200 (example)	$____
Debt payments	$250 (example)	$____
Savings for surprise costs	$150 (example)	$____
Everything else	$300 (example)	$____
Left over (income minus all costs)	$0 (example)	$____

Follow-up schedule

Use this schedule as a rough guide for staying on top of a small business tax issue. Adjust it to any deadlines in your paperwork, which always come first.

When	What to do
Day 1	Gather your documents and write a short summary of the problem.
Day 1 to 3	Contact the other side and ask for what you want, in writing.
About 1 week later	Follow up if you have not heard back, and note the date.
About 2 weeks later	Send a firmer written follow-up with a clear deadline.
After the deadline	Escalate to a manager, a complaint office or another outside option.
Ongoing	Keep every reply and update your notes after each contact.

Helpful tips

Record keeping

Separate business and personal accounts.
Save receipts digitally.
Track mileage.
Update books monthly.

Payments

Pay electronically.
Set aside tax money.
Keep confirmations.
Know your deposit schedule.

Avoiding scams

The IRS does not demand gift cards.
Verify letters on IRS.gov.
Do not share passwords.
Watch for fake tax preparers.

Keeping a paper trail

Good records are the single most useful tool in any small business tax problem. They turn "he said, she said" into facts you can point to.

Use one folder

Keep a paper folder or one digital folder for this issue only. Put every bill, letter, receipt and screenshot in it, named with the date first so it sorts in order.

Write things down the same day

After every phone call, write the date, time, the person's name, what they said and what happens next. Notes made the same day are much more believable than memories weeks later.

Prefer writing over talking

When something important is agreed on the phone, send a short email that says "To confirm our call today..." and repeat the key points. That creates a record the other side can correct if they disagree.

Take photos and screenshots

Photos show condition and dates. Screenshots capture web pages, prices and account screens that may change later.

How to write a clear complaint

If you need to complain about a small business tax issue, a short, calm, specific message gets better results than a long angry one.

Say who you are and give any account, order or reference number.
Describe what happened in a few sentences, with dates.
Say exactly what you want: a refund, a repair, a correction or an explanation.
Give a reasonable deadline, such as 10 or 14 days.
List what you attached, and send copies, never your originals.

Read it once more before you send it. Remove anything insulting, and keep a copy of what you sent and when.

Where to escalate if you get nowhere

If the business or person does not fix the problem, there are usually outside places to turn. Which one fits depends on the issue and where you live.

Your state attorney general or consumer protection office

Most states take consumer complaints online. They may contact the business for you, and complaints help them spot patterns.

Federal agencies

The Consumer Financial Protection Bureau (CFPB) handles complaints about banks, credit cards, loans and debt collectors. The Federal Trade Commission takes fraud and scam reports at ReportFraud.ftc.gov.

Licensing boards

Many trades and professions are licensed by the state. A licensing board can look into complaints about a licensed business.

Small claims court

For smaller money disputes, small claims court is built for people without lawyers. Dollar limits and filing fees differ by state, so check your local court's website.

Your card issuer

If you paid by credit card, you may be able to dispute a charge for goods or services you did not receive as agreed. Contact your issuer quickly, because there are time limits.

Staying calm and organized

Money and paperwork problems are stressful. A simple routine makes them feel smaller.

Set one short time each week to work on it, instead of worrying about it every day.
Do the hardest call first, while you have the most energy.
Write down your next single step before you stop for the day.
Ask a trusted friend or family member to read important letters before you send them.
Celebrate small wins, like getting a reference number or a written answer.

Call log template

Copy this into a notebook or a notes app and fill in one block for every call about your small business tax issue.

Date and time

Write the date and the start time of the call, and how long you were on hold if it was long.

Who you spoke with

Get a first name, a department and, if they have one, an employee or agent ID.

What was said

Summarize what you asked for and what they told you, in your own words.

Reference number and next step

Ask for a reference or ticket number every time, and write down who is doing what next and by when.

Protecting yourself from scams

Scammers often target people who are already dealing with a stressful small business tax problem. A few habits protect you.

Slow down

Scammers push urgency, saying you must act today or lose out. A real business will give you time to read and think.

Check who you are dealing with

Look up the business's phone number and website yourself instead of using a number from a text, email or pop-up. Call that number to confirm.

Watch how they want to be paid

Requests for gift cards, wire transfers, payment apps to strangers or cryptocurrency are strong warning signs. These are hard or impossible to get back.

Guard your personal information

Do not give your Social Security number, bank login or one-time passcodes to anyone who contacted you first. Real companies do not ask for your passcodes.

Report it

If you think you were targeted, report it at ReportFraud.ftc.gov and to your state attorney general. If money was taken, call your bank or card issuer right away.

Free and low-cost help

You do not have to figure out a small business tax problem alone. Many sources of help cost little or nothing.

211

Call or text 211, or visit 211.org, to find local help with bills, food, housing and other needs in many parts of the country.

Legal aid

Legal aid organizations give free legal help to people with lower incomes. Search for legal aid plus your state, or visit LawHelp.org.

Public libraries

Librarians can help you find forms, print documents, use computers and locate local services.

Nonprofit credit counseling

Nonprofit credit counselors can help you make a budget and look at your options. Look for agencies affiliated with the National Foundation for Credit Counseling and ask about fees up front.

Government websites

Official sites end in .gov. They offer free forms and guides, so be cautious of sites that charge for things the government gives away.

Reading the fine print

Contracts and terms for small business tax matters often hide important details in small type. These are the parts worth slowing down for.

Automatic renewal

Look for words like "renews automatically" or "continuous service." Note the renewal date and exactly how to cancel.

Fees and penalties

Search the document for "fee," "charge" and "penalty." Late fees, cancellation fees and processing fees add up.

Cancellation terms

Find how much notice you must give, how you must give it and whether any money is refundable.

Arbitration clauses

Some contracts say disputes must go to private arbitration instead of court, and may limit group lawsuits. Know whether yours does before you sign.

Changes to terms

Some agreements let the company change terms with notice. Check how they will notify you.

Signatures and blanks

Never sign a document with blank spaces. Draw a line through empty spaces or write "N/A," and get a copy of what you signed.

Questions to ask yourself first

Before you act on a small business tax problem, a few minutes of thinking helps you choose the right path.

What outcome do I want?

Decide whether you want money back, a repair, a correction, more time or just an answer. A clear goal makes every message shorter and stronger.

What is my deadline?

Look for dates in your paperwork, such as due dates, response windows or warranty end dates. Deadlines decide what you must do first.

What proof do I have?

List the documents, photos and messages that support your side. If something is missing, ask for copies now.

What is it worth to me?

Weigh the money involved against the time and stress. Sometimes a quick partial fix is worth more than a long fight.

Who can help?

Think about who you could ask for advice, from a knowledgeable friend to a free local help program.

Small business tax checklist

Use this list.

☐ Business type identified
☐ All taxes listed
☐ Due dates found
☐ Calendar created
☐ Tax savings set aside
☐ Books updated monthly
☐ W-9s collected
☐ Payments made electronically
☐ Extensions filed if needed
☐ Yearly review done

Questions to ask before you agree to anything

Asking these questions before you sign or pay can prevent most small business tax surprises.

☐ What exactly is included in the price?
☐ What is not included, and what could make the price go up?
☐ Can I have that in writing?
☐ What happens if I cancel or change my mind?
☐ Is there a warranty or guarantee, and what does it cover?
☐ Who do I contact if there is a problem later?
☐ When is payment due, and what payment methods are accepted?
☐ Are there any fees for paying late or paying early?
☐ How long will this take?
☐ Can I take a day to think it over?

Documents to keep

Keep these.

Document	Why it matters	How long to keep
Tax returns	Proof of filing	Generally at least several years
Receipts	Support deductions	Generally at least three years
Payroll records	Required for employers	Generally at least four years
Bank statements	Show income	Several years
Payment confirmations	Prove payments	Several years

Red flags

Watch out for these.

Calls demanding immediate payment by gift card.
Emails asking for passwords.
Preparers who will not sign returns.
Promises of huge refunds.

When to get professional help

Get help in these cases.

You receive an IRS notice you do not understand.
You owe a large amount.
You have employees.
You sell in many states.

Schedule C: Form for sole proprietor income.
Form 1065: Partnership tax return.
Form 1120-S: S corporation tax return.
Estimated taxes: Payments during the year.
EFTPS: Electronic Federal Tax Payment System.
Form 941: Quarterly payroll tax return.
Form W-9: Taxpayer information form.
Form 1099-NEC: Form reporting contractor payments.
Extension: Extra time to file.
Safe harbor: Rules to avoid underpayment penalties.

Frequently asked questions

When are business taxes due?

It depends on your business type. Check IRS.gov.

Do I need to pay estimated taxes?

If you expect to owe and no tax is withheld.

Does an extension give more time to pay?

No, only more time to file.

What is EFTPS?

A free system for federal tax payments.

When are 1099s due?

Form 1099-NEC is generally due January 31.

How long should I keep records?

Generally several years. Check IRS guidance.

What if I miss a deadline?

File and pay as soon as possible.

Do I need a tax professional?

It can help for complex situations.

What are payroll taxes?

Taxes withheld from employee wages plus employer taxes.

Do I need to collect sales tax?

If you sell taxable goods or services in a state.

What is a W-9?

A form collecting a contractor's tax ID.

How do I avoid scams?

Verify contacts on IRS.gov and never pay by gift card.

A simple tax calendar can save you from costly penalties.