File Your Washington Business Taxes Online with Confidence
X.TAX makes Washington business tax filing easy, accurate, and stress-free.
Washington Business Taxes
Know your WA Biz Taxes Better
Washington operates a unique tax system, including the Business and Occupation (B&O) tax, which applies to businesses based on gross receipts rather than profits. Whether you run a corporation, partnership, LLC, or sole proprietorship, X.TAX ensures fast, accurate filing and helps you take advantage of available tax exemptions and credits.
Key Washington Business Tax Forms You Need
Know the forms required to meet WA business tax regulations.
Corporations
- Form 1120 – U.S. Corporation Income Tax Return
- Form 1120S – U.S. Income Tax Return for an S Corporation
- Form C – Washington Corporate Excise Tax Return (if applicable)
- Form B&O – Business and Occupation Tax Return
Partnerships
- Form 1065 – U.S. Return of Partnership Income
- Form P – Washington Partnership Tax Return
LLCs and Sole Proprietors
- Form 1040 – U.S. Individual Income Tax Return (for sole proprietors)
- Form B&O – Business and Occupation Tax Return (if applicable)
For Estates and Trusts
- Form 1041 – U.S. Income Tax Return for Estates and Trusts
Washington Business Tax Filing in Four Simple Steps
X.TAX makes tax filing fast, secure, and error-free.
Create an Account
Set up your profile securely.
Upload Your Information
Enter your income, expenses, and tax forms.
Review for Errors
Use smart tools to verify accuracy.
Submit to the State
File with one click and track your submission.
Never Miss a Washington Business Tax Deadline
Stay ahead of tax deadlines with X.TAX reminders.
| Business Type | Forms | Due Date | Extension Deadline |
|---|---|---|---|
| Corporations | Form 1120 | April 15, 2025 | October 15, 2025 |
| Form 1120S | March 15, 2025 | September 15, 2025 | |
| Form C | April 15, 2025 | October 15, 2025 | |
| Form B&O | April 15, 2025 (Annual Return) | N/A | |
| Partnerships | Form 1065 & Form P | March 15, 2025 | September 15, 2025 |
| LLCs & Sole Proprietors | Form 1040 | April 15, 2025 | N/A |
| Estates & Trusts | Form 1041 | April 15, 2025 | October 15, 2025 |
Reduce Your WA Business Tax Burden with Exemptions
Take advantage of Washington’s business tax relief programs.
Business and Occupation (B&O) Tax Exemptions
Sales Tax Exemptions
Non-Profit Tax Exemption
Research and Development (R&D) Tax Credit
Multiple Activities Tax Credit (MATC)
Why Washington Businesses Choose X.TAX
The easiest way to file WA business taxes—fast, secure, and stress-free.
Audit Protect
- Detect and address audit triggers early using Data Signals.
- Manage audits efficiently with full support from X.TAX.
RiskScore
- Track your IRS account status in real time.
- Receive alerts about potential filing issues or unresolved balances.
AItomatic Filings
- Let CPAs handle your filings for $250.
- Includes audit protection for a full year.
QuickBooks Integration
- Import financial data directly for faster, error-free filings.
Washington Business Owners Rely on X.TAX
See how WA businesses streamline tax filing with X.TAX.
Washington Business Owners Rely on X.TAX
Find answers to your Washington business tax questions.
Who qualifies for Washington’s B&O tax exemption?
Small businesses below a certain gross receipts’ threshold may qualify for a B&O tax exemption.
Do non-profits pay Washington state taxes?
Certain IRS-qualified non-profits may be exempt from state taxes in Washington.
What are the key Washington business tax deadlines?
Most tax filings are due April 15, 2025, with extensions available until October 15, 2025.
How does X.TAX ensure accurate tax filing?
Our smart system scans your filing for errors, missing deductions, and compliance with WA tax laws.
Is my business data secure with X.TAX?
Yes! X.TAX uses state-of-the-art encryption for secure, confidential tax filing.
