Updated July 1, 2025

A 3D-rendered topographic map of Washington State on a wooden backdrop, showing low coastal plains in blue‑green on the west, rising mountains in golden yellow and brown in the center and east, with the bold white text “Washington Cannabis Tax Guide 2025” overlayed at the bottom.Key Points

  • 37 % Excise Tax on all adult‑use retail cannabis sales, collected by retailers and remitted to the WSLCB.

  • Sales Tax applies to the full retail price (which includes the excise tax): 6.5 % statewide plus local add‑ons (0 %–3.9 %).

  • Medical‑Cannabis Exemption: Qualifying patients pay no 37 % excise tax (effective June 6, 2024–June 30, 2029), but still owe sales tax.

  • No Income Tax; instead, a Business & Occupation (B&O) Tax on gross receipts. Washington does not decouple from federal IRC § 280E, so cannabis businesses cannot deduct ordinary expenses for state tax purposes.

  • Monthly Filing required for excise and combined excise/sales returns, due on or before the 20th of the following month.

  • Penalties & Audits: Late or inaccurate filings incur penalties, interest, and potential WSLCB enforcement (including license suspension).

Understanding Washington’s Cannabis Tax Structure

280E at the State Level

Washington has not adopted any state‑level relief from federal IRC § 280E. Cannabis operators remain unable to deduct common business expenses when calculating state‑level B&O tax, effectively taxing gross receipts rather than net income.

Impacts:

  • Higher Effective Tax Rate compared to states that decouple.

  • Competitive Disadvantage for in‑state retailers.

  • Advocacy Ongoing: Industry groups are lobbying for relief in upcoming legislative sessions.

State Tax System Overview

  • Cannabis Excise Tax: 37 % of the retail selling price.

  • Retail Sales Tax: 6.5 % state base + local rates (0 %–3.9 %).

  • B&O Tax: Gross‑receipts tax on all revenues; no deduction for cost of goods sold or operating expenses.

Cannabis Excise Tax: What Retailers Need to Know

  • Rate (2025): 37 % of retail price (uniform statewide).

  • Collection: Retailers add this tax at point of sale.

  • Exemption for Medical Patients: Qualifying patients (valid DOH recognition card) pay no 37 % excise tax, effective June 6, 2024–June 30, 2029.

  • Embedded in Price: Excise tax is included in the shelf price; sales tax is then assessed on the total.

Sales Tax: Local Impact on Cannabis Sales

  • State Base Rate: 6.5 %.

  • Local Add‑Ons: Varies by city/county — commonly 0.5 %–3.9 %.

  • Example Combined Rates (2025):

    • Seattle: 10.25 %

    • Spokane: 9.1 %

    • Tacoma: 10.3 %

  • Calculation: Sales tax attaches to the full retail price (including excise tax).

Business & Occupation (B&O) Tax

  • Structure: Gross‑receipts tax with classification‑based rates.

  • No Net‑Income Deduction: All revenue is taxable; no offset for expenses due to 280E alignment.

  • Filing: Through DOR, quarterly or annually, per revenue thresholds.

Filing & Payment Deadlines

Tax Type Filing Frequency Due Date Agency
Cannabis Excise & Sales Monthly On or before the 20th of the following month WSLCB (e-file required)
Retail Sales Tax (standalone) Monthly/Quarterly¹ On or before the 25th of the following month DOR
B&O Tax Quarterly/Annual Per DOR schedule (e.g., April 30, July 31, Oct 31, Jan 31) DOR

¹Based on average monthly liability; see DOR’s Tax Filing Frequency Guide.

  • Zero‑Sales Returns: Must still file “zero” returns for excise and sales tax.

  • E‑Filing: Mandatory for cannabis excise and combined returns via WSLCB’s online portal.

Penalties & Compliance Risks

  • Late or Inaccurate Filings: Penalties (2 % monthly on unpaid balances) and interest.

  • License Enforcement: WSLCB may refer delinquent accounts for suspension or revocation.

  • Audit Exposure: High risk—maintain detailed transaction, exemption, and traceability records.

How to Calculate Your Total Cannabis Tax Obligation

  1. Excise Tax: 37 % × retail price (unless medical exemption).

  2. Sales Tax Rate: Sum state (6.5 %) + local add‑on.

  3. Sales Tax Amount: Apply combined rate to full retail price (including excise).

  4. B&O Tax: Compute on gross receipts per your classification rate.

Key Trade Associations

Government Contact List

Liquor & Cannabis Board (WSLCB)

Department of Health (DOH)

  • Manages Medical‑Cannabis Program and patient recognition cards

Department of Revenue (DOR)

  • Administers standalone Sales Tax & B&O filings

Disclaimer: This guide is for informational purposes only and does not constitute legal or tax advice. Regulations may change — always consult a qualified tax professional or attorney before making compliance decisions.