Guides a Massachusetts vendor or remote seller through nexus analysis, DOR vendor registration (Form TA-1), periodic ST-9 sales tax return preparation, use tax self-assessment, and exemption certificate management. Covers the 6.25% state rate, clothing and food exemptions, SaaS taxability, and the $100,000 economic nexus threshold.
Determine whether the business has physical or economic nexus in Massachusetts under G.L. c. 64H. Physical nexus includes any office, warehouse, employee, or agent in the Commonwealth. Economic nexus is triggered at $100,000 in Massachusetts sales in the current or prior calendar year (no transaction-count threshold). Once nexus is confirmed, register with the Massachusetts DOR as a vendor by filing Form TA-1 (Taxpayer Registration Form) through MassTaxConnect.
Map each product or service line to Massachusetts taxability rules under G.L. c. 64H. The standard state rate is 6.25% (destination-based). Key exemptions include: clothing items under $175 per item (only the amount over $175 is taxable), grocery food, prescription drugs, resale purchases, and manufacturing equipment. SaaS, canned software, and digital goods are taxable. Professional services are not taxable. Identify any sales to exempt organizations requiring Form ST-2 (Exempt Organization Certificate) on file.
The Massachusetts DOR assigns a filing frequency (monthly, quarterly, or annual) based on projected sales tax liability. Monthly filers (liability over $1,200/year) must file by the 20th of the following month. Quarterly filers file by the 20th of the month following the quarter. Annual filers file by January 20. Confirm the assigned filing period in MassTaxConnect and set up a compliance calendar. Vendors collecting $150,000 or more in sales tax annually are required to remit by electronic funds transfer.
Compile gross Massachusetts sales for the period, back out exempt sales (with documentation), and compute net taxable sales. Apply the 6.25% rate to reach gross tax. Subtract any vendor compensation allowance (0.7% on timely-filed returns, up to $1,120 per filing period under G.L. c. 64H §16). Add any use tax owed on purchases where Massachusetts sales tax was not charged by the supplier. Prepare the ST-9 return for review before submission through MassTaxConnect.
Submit the ST-9 through MassTaxConnect and remit payment by the applicable due date. EFT filers must initiate the ACH debit no later than the due date. Retain all records supporting the return — sales invoices, exemption certificates (Form ST-2, ST-4), shipping documentation, and accounting system exports — for a minimum of three years (the standard Massachusetts assessment statute under G.L. c. 62C §26), though six years is recommended for significant nexus situations.
Run this workflow in your AI agent
Install the MCP connector once — your agent loads the right skills, works through each phase, and routes to a licensed Massachusetts accountant for review.
ma-sales-tax
Use this skill whenever asked about Massachusetts sales and use tax. Trigger on phrases li
maryland-sales-tax
Use this skill whenever asked about Maryland sales and use tax. Trigger on phrases like "M
massachusetts-sales-tax
Use this skill whenever asked about Massachusetts sales and use tax. Trigger on phrases li
maine-sales-tax
Use this skill whenever asked about Maine sales and use tax. Trigger on phrases like "Main