Currently 23 states and one associate member state are signed on to the agreement
No one can dispute that the United States’ sales tax system is overly complex. Each of the forty-six states (plus Washington DC) that have a sales tax make their own rules and laws. Sales tax rates vary in the US’s more than 11,000 taxing jurisdictions. And the process for filing and remitting sales tax is different in every state.
The Streamlined Sales and Use Tax Project aims to simplify sales tax administration for both businesses and states by persuading states to agree to a uniform set of rules. Currently the Agreement has twenty-three member states and one associate member (Tennessee).
The SSUTA aims to achieve this by encouraging member states to change their laws and regulations to promote uniformity in:
How tax rates work
What products are taxed and how those products are defined