Washington State: Lowest Marginal Tax Rates for Pass-Through Businesses

According to the Tax Foundation, Washington State has the lowest marginal tax rate for "pass-through businesses." A "pass-through" business includes sole proprietors, S Corporations, limited liability companies (LLCs) and partnerships.

The Tax Foundation calculates Washington State's "Top Marginal Tax Rate" for Sole Proprietorships and Partnerships (including LLC's which have no made an "S election") at 42.6%. It calculates the "Top Marginal Rate" for S-Corporations at 39.6%.

The rates calculated for Idaho are 48.2% for Sole Proprietorships and Partnerships and 45.3% for S-Corporations. The rates calculated for Oregon are 49.8% for Sole Proprietorships and Partnerships and 46.8% for S-Corporations. 

The reason that Washington rate is lower than other states is because Washington State does not have an income tax.

Additionally, the Tax Foundation reports that 95% of businesses nationwide are "pass-through" entities. This means that Washington State has a significant edge over other states. 

The Tax Foundation's report can be found here.