Washington Sole Proprietorship Tax Deadlines 2026
Complete guide to Sole Proprietorship filing dates, extensions, estimated payment schedules, and required forms in Washington for the 2026 tax year. Washington does not have a state income tax, so Sole Proprietorship entities only need to file federal returns.
Washington Sole Proprietorship filing deadline
No state individual income tax in Washington.
Due: N/A
Form: N/A
Estimated payments
No state estimated payment schedule listed.
Due: N/A
Washington Sole Proprietorship Tax Calendar at a Glance
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FAQ
When is the Sole Proprietorship tax filing deadline in Washington for 2026?
Washington does not have a separate state filing requirement for Sole Proprietorship entities. Check with Washington Department of Revenue for the latest information.
Does Washington require Sole Proprietorship estimated tax payments?
Estimated payments are not typically required at the entity level for Sole Proprietorship in Washington, but confirm with Washington Department of Revenue.
What form do I file for a Sole Proprietorship in Washington?
Sole Proprietorship entities in Washington file using Form N/A. You can download the form from Washington Department of Revenue at https://dor.wa.gov.
Can I get an extension for my Washington Sole Proprietorship tax return?
Check with Washington Department of Revenue for extension options for Sole Proprietorship entities in Washington.
What are the penalties for filing late in Washington?
Washington typically charges a failure-to-file penalty (usually 5% of unpaid tax per month, up to 25%) and a failure-to-pay penalty (usually 0.5-1% per month). Interest also accrues on unpaid balances. Filing for an extension by the original deadline avoids the failure-to-file penalty but not the failure-to-pay penalty.
Where can I file Washington Sole Proprietorship taxes?
File through Washington Department of Revenue. Visit https://dor.wa.gov for e-filing options, downloadable forms, and payment portals.