Washington LLC Tax Structure Guide
Complete 2026 guide to how Washington LLCs are taxed — disregarded entity, partnership, S-Corp election, and C-Corp options. Federal + state interactions, with exact dollar math.
Personal income tax
None (but capital gains tax of 7% over $250K)
Entity-level tax
B&O tax (Business & Occupation): 0.138%-1.5% on gross revenue by activity
PTET available
No
Federal options
Disregarded / Partnership / S-Corp / C-Corp
4 Tax Classification Options for Washington LLCs
Disregarded Entity (SMLLC default)
Single-member LLCs report income on Schedule C of the owner's 1040. Owner pays self-employment tax (15.3%) on net profit. Simple, no separate business return. Best for low-profit or just-starting businesses.
Partnership (Multi-member default)
Multi-member LLCs file Form 1065 + Schedule K-1s to each member. Members report their share on personal 1040 + Schedule SE for SE tax. No entity-level federal tax.
S-Corporation Election
File Form 2553 with the IRS. Owner-employee paid W-2 salary (subject to payroll tax) + distributions (not subject to SE tax). Typically saves $5K-$15K/yr at $100K profit. WA has no income tax but B&O tax applies to gross receipts regardless. S-Corp savings clean for SE tax; unchanged on B&O.
C-Corporation Election
File Form 8832 to elect C-Corp. Entity pays 21% federal corporate tax. Dividends taxed again at shareholder level (double taxation). Rarely the right choice for small LLCs — mainly for VC-backed startups or retained earnings strategies.
Which Tax Structure Should You Choose?
Profit under $40K/yr
Stay disregarded entity (or partnership for multi-member). S-Corp compliance costs exceed savings.
Profit $40K-$80K
Borderline. Run exact S-Corp savings calculator. Usually better to stay default until profit stabilizes above $80K.
Profit $80K-$150K
S-Corp election typically saves $3K-$8K/yr net of compliance costs. File Form 2553 at tax year start.
Profit $150K-$300K
S-Corp election saves $8K-$15K+/yr. Core S-Corp strategy applies.
Profit over $300K
S-Corp election + retirement plan (Solo 401(k) or SEP-IRA) + home office accountable plan + QBI optimization. Work with a Washington-focused CPA.
FAQ
How is a Washington LLC taxed by default?
By default, a single-member Washington LLC is taxed as a disregarded entity — you report business income on Schedule C of your personal 1040. A multi-member LLC is taxed as a partnership (Form 1065 + K-1s to each member). Neither pays federal entity tax; income flows to owners. Washington state: None (but capital gains tax of 7% over $250K).
Should my Washington LLC elect S-Corp taxation?
S-Corp election typically makes sense once net profit exceeds ~$80K-$100K, when the payroll + compliance costs are exceeded by self-employment tax savings. WA has no income tax but B&O tax applies to gross receipts regardless. S-Corp savings clean for SE tax; unchanged on B&O. Run the numbers on our S-Corp savings calculator.
What's the Pass-Through Entity Tax (PTET) in Washington?
Not applicable.
Does Washington have a state-level LLC tax?
B&O tax (Business & Occupation): 0.138%-1.5% on gross revenue by activity. This is in addition to the federal tax treatment you elect.
How do I change my Washington LLC's tax election?
To elect S-Corp: file Form 2553 with the IRS within 2 months + 15 days of the target effective date. Late relief is available via Rev. Proc. 2013-30 for up to 3 years. For C-Corp: file Form 8832. Washington's state tax generally follows the federal classification, with some exceptions (e.g., CA's S-Corp entity tax).
What tax forms do Washington LLC owners file annually?
Federal: Schedule C (SMLLC), Form 1065 + K-1 (multi-member), Form 1120-S + K-1 (S-Corp), or Form 1120 (C-Corp). Washington: personal income tax return reporting your share of LLC income (if Washington has income tax), plus any entity-level reports required by Washington.
Optimize your WashingtonLLC's tax structure
Run our S-Corp savings calculator to see the exact dollar benefit for your profit level in Washington. Then form or update your LLC with FormifyAI.