How to File Your Company’s Taxes: Step-by-Step

Filing your company’s taxes can feel overwhelming, but with a clear plan it’s a manageable process. This guide walks you through the essential steps—from gathering documents to submitting your return—so you can file accurately and on time. You’ll learn what information you need, how to choose the right forms, and common pitfalls to avoid.

What You’ll Need

• Your company’s legal name, address, and Employer Identification Number (EIN)
• Financial statements: income statement (profit & loss) and balance sheet
• General ledger or accounting software reports
• Bank and credit card statements for all business accounts
• Records of income: sales invoices, 1099-MISC/1099-NEC forms received, interest statements
• Receipts for deductible expenses: rent, utilities, supplies, equipment, travel, meals, insurance, etc.
• Payroll records and tax forms (W-2, W-3, 941s) if you have employees
• Prior year tax return (for reference)
• Tax software or the services of a CPA/enrolled agent (optional but recommended)

Step-by-Step

1. Determine your business structure. Your tax forms depend on whether you’re a sole proprietorship (Schedule C), partnership (Form 1065), S-corp (Form 1120-S), or C-corp (Form 1120). If you’re unsure, check your formation documents or ask your accountant.
2. Gather all financial records. Compile your income statements, expense receipts, and bank statements. Reconcile your books to ensure every transaction is accounted for. This is the foundation of an accurate return.
3. Separate personal and business expenses. Review your records for any personal items mistakenly paid from business accounts. Remove them—they are not deductible and can trigger audits.
4. Review deductible expenses. Common deductions include: rent, utilities, office supplies, equipment purchases (via depreciation or Section 179), employee wages, contractor payments (you’ll need to issue 1099-NECs), business insurance, and home office expenses if applicable.
5. Calculate your income and deductions. Total all revenue sources and subtract deductible expenses to arrive at your taxable income. Use your accounting software or a spreadsheet to double-check the math.
6. Complete the required tax forms. Fill out the appropriate return for your structure. For example, a C-corp uses Form 1120, an S-corp uses 1120-S, and a partnership uses 1065. Sole proprietors report on Schedule C attached to their personal return (1040).
7. Include required schedules and attachments. Depending on your activities, you may need to attach: depreciation schedules (Form 4562), balance sheets, reconciliation of book income, or state-specific forms.
8. Double-check your math and information. Verify your EIN, name, and address. Recalculate totals and ensure all schedules tie to the main form. Errors cause delays or penalties.
9. Sign and file. An authorized officer must sign the return. E-file through the IRS (or your state) using tax software, or mail a paper copy if required. Keep a copy for your records.
10. Pay any taxes due. If you owe, pay by the deadline to avoid interest and penalties. You can pay electronically via EFTPS or by check. If you can’t pay in full, request an installment agreement.
11. File extensions if needed. If you can’t finish by the deadline, file Form 7004 to get an automatic 6-month extension. This extends the filing deadline, not the payment deadline—estimate and pay any tax due to avoid penalties.

Common Mistakes

• Mixing personal and business expenses. This is the most common error. It inflates deductions and raises red flags.
• Missing deadlines. Late filing penalties can be steep. Mark your calendar and file for an extension if needed.
• Incorrect income reporting. Forgetting to include 1099 income or cash transactions leads to mismatches with IRS records.
• Overlooking deductions. Many small businesses miss deductions like home office, vehicle mileage, or retirement contributions.
• Math errors. Simple addition mistakes are common. Use software or double-check with a calculator.
• Signing without reviewing. An unsigned return is invalid and treated as not filed.

Tips

• Use accounting software. QuickBooks, Xero, or even a well-organized spreadsheet can save hours and reduce errors.
• Keep digital copies of receipts. Use a scanner or app to store receipts—this makes it easier to substantiate deductions if audited.
• Set aside money for taxes quarterly. If you expect to owe more than $1,000, make estimated tax payments to avoid underpayment penalties.
• Consider hiring a professional. A CPA can identify deductions you might miss and ensure compliance, especially if your business is complex.
• File electronically. E-filing reduces errors and you get instant confirmation.
• Review prior year returns. Use last year’s return as a checklist to ensure you don’t miss any carryovers or credits.

Troubleshooting

• Missing documents. If you can’t find a receipt, contact the vendor for a duplicate. For missing 1099s, request a copy from the payer. You can still file using your own records if necessary.
• IRS rejects your e-file. Check for typos in your EIN or name. Ensure all required fields are filled. The rejection notice will tell you what to fix.
• You can’t pay the full amount due. File your return anyway and pay as much as possible. Then set up an installment agreement online or by phone. This reduces penalties.
• You discover an error after filing. File an amended return (Form 1120-X for corporations, 1040-X for sole proprietors) to correct it. Do this as soon as possible.
• You receive a notice from the IRS. Read it carefully. It usually explains the issue and what to do. Respond within the timeframe indicated, and contact the IRS if you disagree.

Frequently Asked Questions

What is the deadline for filing business taxes? For C-corps and S-corps, the deadline is usually March 15 (April 15 for C-corps). Partnerships and sole proprietors use April 15. If that falls on a weekend or holiday, the deadline moves to the next business day.

Can I file an extension for my business taxes? Yes, file Form 7004 to get an automatic 6-month extension. However, this only extends the filing deadline, not the payment deadline. You must still pay any estimated tax by the original due date.

What if my business lost money? You may be able to carry the net operating loss back or forward to offset future profits, reducing future taxes. The rules vary by entity type and recent tax law, so consult a professional.

Do I need to file state taxes as well? Yes, most states require a separate return. Check with your state’s revenue department for forms and deadlines. Some states have different due dates than the federal government.

Can I deduct home office expenses? Yes, if you use a portion of your home regularly and exclusively for business. You can use the simplified method (a flat rate per square foot) or the regular method (actual expenses).

What records should I keep and for how long? Keep all tax records for at least 3 years from the date you filed, but 7 years is safer if you might have underreported income. Keep records of asset purchases for as long as you own the asset plus 3 years.

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