How to File Taxes for Your Small Business

Quick answer

• Understand your business structure (sole proprietorship, partnership, LLC, S-corp, C-corp).
• Track all business income and expenses meticulously throughout the year.
• Differentiate between business and personal expenses.
• Know your filing deadlines and consider estimated taxes.
• Consult tax professionals or reliable software for accuracy.
• Keep thorough records for at least three years.

What to check first (before you file or change withholding)

Business Structure

Your business structure dictates how you file taxes. Sole proprietors and single-member LLCs typically report business income and expenses on Schedule C of their personal Form 1040. Partnerships and multi-member LLCs file Form 1065 (an informational return) and issue Schedule K-1s to partners. S-corporations file Form 1120-S and also issue K-1s. C-corporations file Form 1120 and are taxed separately from their owners.

Income Sources

Identify all revenue streams for your business. This includes sales of goods or services, interest earned on business accounts, and any other income directly related to your business operations. Be comprehensive to avoid underreporting.

Withholding or Estimated Payments

If you’re a sole proprietor, partner, or S-corp shareholder who expects to owe at least \$1,000 in taxes, you likely need to pay estimated taxes quarterly. This avoids penalties. For employees of your own corporation, determine appropriate salary and withholding based on your business’s financial situation and IRS guidelines.

Deductions and Credits

Familiarize yourself with common business deductions (e.g., office supplies, travel, salaries, rent, utilities) and potential tax credits. Maximizing these can significantly reduce your tax liability. Keep receipts and documentation for all claimed expenses.

Deadlines and Extensions

Know the key tax deadlines for your business structure. For most businesses, this is April 15th (or the next business day if it falls on a weekend or holiday). Partnerships and S-corps typically have a March 15th deadline. If you need more time, you can file for an extension, but remember that extensions are for filing, not for paying.

Step-by-step (simple workflow)

1. Organize Your Financial Records:

• What to do: Gather all bank statements, receipts, invoices, payroll records, and any other financial documents related to your business for the tax year.
• What “good” looks like: All income and expenses are accounted for and categorized. You have clear documentation for each transaction.
• Common mistake: Relying solely on memory or a shoebox of receipts.
• How to avoid it: Use accounting software or a detailed spreadsheet from the start of the year.

2. Categorize Income:

• What to do: List all revenue sources and amounts earned during the tax year.
• What “good” looks like: A clear total of gross receipts or sales.
• Common mistake: Forgetting to include all income streams, such as interest or miscellaneous income.
• How to avoid it: Review bank deposits and sales records thoroughly.

3. Identify and Categorize Business Expenses:

• What to do: Go through your organized records and list all legitimate business expenses.
• What “good” looks like: Expenses are categorized according to IRS guidelines (e.g., advertising, rent, utilities, supplies, professional fees).
• Common mistake: Mixing personal expenses with business expenses or forgetting deductible items.
• How to avoid it: Create a separate business bank account and credit card.

4. Determine Your Business Structure’s Tax Form:

• What to do: Confirm your official business structure (sole proprietorship, partnership, LLC, S-corp, C-corp).
• What “good” looks like: You know which federal tax forms are required for your specific structure (e.g., Schedule C, Form 1065, Form 1120-S, Form 1120).
• Common mistake: Filing with the wrong forms based on an incorrect understanding of your business structure.
• How to avoid it: Consult your business formation documents or a tax professional.

5. Calculate Net Profit or Loss:

• What to do: Subtract your total business expenses from your total business income.
• What “good” looks like: A clear calculation showing your business’s profitability or loss for the year.
• Common mistake: Incorrectly calculating the difference or making arithmetic errors.
• How to avoid it: Use accounting software or double-check your calculations.

6. Address Self-Employment Taxes (if applicable):

• What to do: If you are a sole proprietor, partner, or LLC member, calculate self-employment taxes (Social Security and Medicare) on your net earnings.
• What “good” looks like: You accurately calculate and report self-employment taxes on Schedule SE.
• Common mistake: Forgetting to account for self-employment taxes, which are in addition to income tax.
• How to avoid it: Understand that these taxes are typically paid on 92.35% of your net earnings from self-employment.

7. Complete Required Tax Forms:

• What to do: Fill out all necessary federal and state tax forms accurately, including income tax forms and any specific business schedules.
• What “good” looks like: All forms are filled out completely, accurately, and without errors.
• Common mistake: Leaving fields blank or providing incomplete information.
• How to avoid it: Use tax software or work with a tax preparer who can guide you through the process.

8. File Your Taxes:

• What to do: Submit your completed tax forms to the IRS and your state tax agency by the deadline.
• What “good” looks like: Your taxes are filed on time, either electronically or by mail, with confirmation of receipt.
• Common mistake: Missing the filing deadline.
• How to avoid it: File well before the deadline or, if absolutely necessary, file for an extension.

9. Pay Any Taxes Owed:

• What to do: If you owe taxes, make your payment by the deadline.
• What “good” looks like: Your tax payment is made in full and on time.
• Common mistake: Underpaying or failing to pay taxes owed.
• How to avoid it: Estimate your tax liability throughout the year and make estimated tax payments if required.

10. Review and Retain Records:

• What to do: Keep copies of all filed tax returns and supporting documentation.
• What “good” looks like: You have a secure system for storing tax records for at least three years.
• Common mistake: Discarding records too soon after filing.
• How to avoid it: Understand the IRS record retention guidelines.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
<strong>Mixing Personal and Business Funds</strong>	Inaccurate expense tracking, difficulty proving business deductions, potential audit trigger.	Open and use a dedicated business bank account and credit card for all business transactions.
<strong>Not Tracking Expenses Diligently</strong>	Missed deductions, lower tax refund or higher tax bill, potential penalties.	Use accounting software, spreadsheets, or a dedicated app to log every business expense with receipts.
<strong>Incorrect Business Structure Filing</strong>	Incorrect tax forms, potential penalties, missed tax benefits, or incorrect tax liability.	Confirm your official business structure with your formation documents and consult a tax professional if unsure which forms to use.
<strong>Forgetting Estimated Taxes</strong>	Underpayment penalties and interest charged by the IRS and state.	Calculate your estimated tax liability and make quarterly payments to avoid penalties. The IRS provides Form 1040-ES for this purpose.
<strong>Claiming Non-Deductible Expenses</strong>	Incorrect tax liability, potential penalties if audited, disallowed deductions.	Understand what qualifies as a legitimate business expense according to IRS rules. Consult IRS publications or a tax professional.
<strong>Missing Filing Deadlines</strong>	Failure-to-file penalties and interest, potential disruption to business operations.	File an extension if needed, but remember it’s an extension to file, not to pay. Set calendar reminders for all tax deadlines.
<strong>Not Keeping Adequate Records</strong>	Inability to support deductions, increased audit risk, potential for disallowed expenses.	Maintain organized records (receipts, invoices, bank statements) for at least three years from the date you filed your return.
<strong>Underreporting Income</strong>	Back taxes, significant penalties, interest, and potential criminal charges.	Be thorough in tracking all revenue streams, including cash and digital payments. Review bank deposits and sales reports meticulously.
<strong>Ignoring State and Local Taxes</strong>	Separate penalties and interest from state and local tax authorities.	Research and comply with all state and local tax requirements, which can vary significantly by location.
<strong>Failing to Deduct Home Office Expenses (if eligible)</strong>	Missed tax savings opportunity.	Understand the IRS rules for home office deductions (exclusive and regular use) and accurately calculate the deductible portion.

Decision rules (simple if/then)

• If your business is a sole proprietorship or single-member LLC, then you will likely report business income and expenses on Schedule C of Form 1040 because this is how the IRS treats pass-through income for individuals.
• If your business is a partnership or multi-member LLC, then you will file Form 1065 (an informational return) and issue Schedule K-1s to partners because this form reports the partnership’s income, deductions, and credits, which are then passed through to the partners.
• If you are a C-corporation, then your business files Form 1120 and pays taxes at the corporate level because C-corps are separate legal entities from their owners.
• If you are an S-corporation, then you file Form 1120-S and issue Schedule K-1s because S-corps also pass income and losses through to shareholders, avoiding double taxation.
• If your business expects to owe at least \$1,000 in taxes for the year and you are not having sufficient taxes withheld from wages, then you likely need to make quarterly estimated tax payments because the IRS requires taxpayers to pay income tax as it is earned.
• If you operate your business from your home, then you may be eligible for the home office deduction if you use a portion of your home exclusively and regularly for business because the IRS allows deductions for business use of your home.
• If you pay employees, then you must obtain an Employer Identification Number (EIN) from the IRS because all businesses with employees need one for tax reporting purposes.
• If you have business-related travel expenses, then you can deduct them if they are ordinary and necessary for your business because the IRS allows deductions for legitimate business travel.
• If you purchase business assets like equipment or vehicles, then you may be able to deduct their cost over time through depreciation because the IRS allows businesses to recover the cost of assets used in their operations.
• If you are unsure about specific deductions or credits, then consult a tax professional because they can provide tailored advice based on your business’s unique situation.
• If you receive income from freelance work or independent contracting, then you are considered self-employed and will need to pay self-employment taxes on your net earnings because this covers Social Security and Medicare contributions.

FAQ

Q1: What is the difference between a sole proprietorship and an LLC for tax purposes?

A1: For tax purposes, a single-member LLC is often treated the same as a sole proprietorship, meaning business income and losses are reported on the owner’s personal tax return (Schedule C). Multi-member LLCs are typically taxed as partnerships.

Q2: Do I need a separate bank account for my business?

A2: Yes, it is highly recommended to have a separate business bank account. This simplifies bookkeeping, makes it easier to track income and expenses, and helps maintain the legal distinction between your personal and business finances, which is crucial for liability protection.

Q3: What are estimated taxes and why do I need to pay them?

A3: Estimated taxes are payments you make to the IRS throughout the year to cover income tax and self-employment tax liability on income that isn’t subject to withholding. You generally need to pay them if you expect to owe at least \$1,000 in tax.

Q4: How long do I need to keep my business tax records?

A4: The IRS generally recommends keeping records for at least three years from the date you filed your return or the due date of the return, whichever is later. For certain assets, you may need to keep records longer.

Q5: Can I deduct my home internet and cell phone bill?

A5: If you use these services for business, you can deduct the business-use portion. For example, if you use your cell phone 70% for business, you can deduct 70% of the bill. You must be able to substantiate this business use.

Q6: What is an Employer Identification Number (EIN) and do I need one?

A6: An EIN is a nine-digit number assigned by the IRS to business entities operating in the United States for identification purposes. You generally need one if you operate as a corporation or partnership, have employees, or file certain tax returns.

Q7: Are business meals deductible?

A7: Business meals can be partially deductible, typically up to 50%, if they are ordinary and necessary for your business and you or an employee accompanies the person you are dining with. You must keep records of the expense.

Q8: What if I can’t pay my business taxes on time?

A8: You may be able to set up a payment plan with the IRS or your state tax agency. It’s important to contact them as soon as possible to discuss your options and potentially avoid more severe penalties.

What this page does NOT cover (and where to go next)

• Specific state and local tax laws: Tax regulations vary significantly by state and municipality. Research your specific local requirements or consult a local tax professional.
• Detailed guidance on payroll taxes: If you have employees, understanding federal and state payroll tax obligations (like FICA, FUTA, and state unemployment taxes) is critical.
• Advanced tax strategies for specific industries: Certain industries have unique tax considerations, deductions, or credits not covered here.
• International tax implications: If your business operates or has transactions outside the U.S., you’ll need specialized advice.
• Retirement plan contributions for business owners: Understanding options like SEP IRAs or Solo 401(k)s can offer significant tax advantages.