The Massachusetts resale certificate: buying inventory without paying sales tax

Key takeaways

• A Massachusetts resale certificate is Form ST-4, the Department of Revenue (DOR) form a registered vendor gives a supplier to buy goods for resale without paying the 6.25% state sales tax.
• Only a buyer who holds a Massachusetts vendor registration under General Laws Chapter 64H, Section 7 can sign Form ST-4, and registration is done online through MassTaxConnect.
• Form ST-4 stays with the supplier, which has 60 days to produce it after a written notice from the Commissioner of Revenue.
• Inventory bought with Form ST-4 and then used by the business is treated as a retail sale at the time of first use, and tax is owed on its cost.
• Form ST-4 (Rev. 8/16) warns that willful misuse can bring up to one year in prison and fines of up to $10,000, or $50,000 for corporations.

If you run a shop, an online store or a wholesale business in Boston or anywhere else in Massachusetts, you can buy your inventory without paying sales tax, provided you are registered with the Department of Revenue and give each supplier a signed Form ST-4. A Massachusetts resale certificate is Form ST-4, the Sales Tax Resale Certificate, a document set by the Commissioner of Revenue in which a buyer certifies that goods or taxable services are bought for resale in the regular course of business. The rule is set by the state, not the city.

The sections below cover who can sign Form ST-4, how vendor registration works in MassTaxConnect, what goes on the form, what your supplier has to do with it, and what DOR says happens when a certificate is misused.

What is a Massachusetts resale certificate?

A Massachusetts resale certificate is Form ST-4, a one-page DOR form that a buyer signs and hands to a seller to show that a purchase is for resale and is not a retail sale. The DOR regulation 830 CMR 64H.8.1 defines a retail sale as a sale for any purpose other than resale in the regular course of business. The Massachusetts sales tax is 6.25% of the sales price, according to the DOR sales and use tax guide (updated May 7, 2026), and the tax applies to retail sales.

Under General Laws Chapter 64H, Section 8, every sale a vendor makes is presumed taxable until the vendor proves otherwise. Form ST-4 is how the vendor meets that burden. You then collect the 6.25% tax from your own customer at retail.

The table lists four DOR sales tax forms with similar numbers.

Form	Name	Who uses it
Form ST-1	Sales and Use Tax Registration Certificate	Issued by DOR to a registered vendor for each business location
Form ST-4	Sales Tax Resale Certificate	A registered vendor buying goods or taxable services to resell
Form ST-5	Certificate for tax-exempt organizations	Tax-exempt organizations, per the notice on Form ST-4
Form ST-12	Exempt Use Certificate	Manufacturers and other buyers claiming an exempt use

Who can use Form ST-4 in Massachusetts?

Form ST-4 can be used only by a buyer who meets the conditions in Chapter 64H, Section 8(b) and 830 CMR 64H.8.1(4)(b). The statute and the regulation set three conditions for the buyer:

• You are in the business of selling goods or services of the same kind as the ones you are buying.
• You hold a Massachusetts vendor registration under Chapter 64H, Section 7.
• At the time of purchase you intend to resell the item in the regular course of business, or you cannot tell yet whether the item will be sold or used some other way.

A Dorchester gift shop buying candles for its shelves fits all three. The same shop buying a cash register does not, because the shop will use the register. Service businesses that are unsure whether they qualify are told on Form ST-4 to read the DOR regulation on service enterprises, 830 CMR 64H.1.1.

How do you register as a vendor with the Department of Revenue?

You register as a vendor with the Department of Revenue online through MassTaxConnect, the DOR tax portal. Chapter 64H, Section 7 says no person may do business in Massachusetts as a vendor unless a registration has been issued for each place of business. The DOR page Register your business with MassTaxConnect (updated May 7, 2026) lists the steps:

1. On the MassTaxConnect home screen, choose “Sign Up.”
2. Choose “Register a New Business.”
3. Enter the registration details DOR asks for, including your business start date and your legal and mailing addresses.
4. Wait for the confirmation email, then set up two-step verification at your first login.

DOR asks every business for an Employer Identification Number (EIN); a sole proprietor with no employees can use a Social Security number. Once DOR approves the registration, it mails a Sales and Use Tax Registration Certificate (Form ST-1) for each location, and each certificate must be posted where it is visible at all times. The DOR registration page does not list a fee or a processing time.

How do you fill out Form ST-4?

You fill out Form ST-4 yourself and give it to your supplier; the form is a blank that DOR publishes, and DOR does not issue a certificate to you. Form ST-4 (Rev. 8/16) asks for the following:

• The purchaser’s name and address
• Your DOR Account ID number or Federal ID number
• The type of business you are in
• The type of goods or services being purchased, “as specific as possible”
• The name of the vendor you are buying from
• Your signature, title and the date

The signature is made under the penalties of perjury. By signing, you certify that you hold a valid Massachusetts vendor registration and intend to sell the purchased items in the regular course of business.

Form ST-4 also has two check boxes: “Single purchase certificate” and “Blanket certificate.” The form does not explain either term, and 830 CMR 64H.8.1 does not say how long a blanket certificate lasts. Ask DOR at (617) 887-6367, the number printed on the form as 887-MDOR, if a supplier wants one certificate to cover repeat orders.

What does a supplier have to do when it accepts Form ST-4?

A supplier that accepts Form ST-4 has to take it in good faith, check that it is complete and signed, and keep it. The notice to vendors on Form ST-4 says the certificate becomes part of the vendor’s permanent tax records. Good faith comes into doubt, the same notice says, when the vendor knows facts suggesting the buyer does not plan to resell.

The Commissioner of Revenue can ask a vendor in writing to produce particular certificates. Under 830 CMR 64H.8.1(4)(d), the vendor has 60 days from the date of the notice to make them available, and the same 60 days to correct a certificate that is deficient. A vendor that misses the deadline has to prove by other evidence that the sale was not a taxable retail sale.

The DOR sales and use tax guide says vendors can confirm a customer’s sales and use tax registration and resale certificate online through MassTaxConnect.

What happens if you use inventory bought with Form ST-4?

Inventory bought with Form ST-4 becomes taxable when you use it for anything other than retention, demonstration or display while holding it for sale. Chapter 64H, Section 8(d) treats that use as a retail sale by you at the time of first use, and your cost for the item counts as the gross receipts from the sale. A Brighton hardware store that takes a ladder off the sales floor for its own crew owes tax on what the store paid for the ladder.

Section 8(d) has one exception. If the only use is renting the item out while you still hold it for sale, you may choose to include the rental charge in your gross receipts in place of the item’s cost.

What are the penalties for misusing a Massachusetts resale certificate?

Penalties for misusing a Massachusetts resale certificate are stated on the form itself. The warning on Form ST-4 (Rev. 8/16) reads: “Willful misuse of this certificate may result in criminal tax evasion sanctions of up to one year in prison and $10,000 ($50,000 for corporations) in fines.”

The DOR sales and use tax guide lists separate, general sales tax penalties, as of its May 7, 2026 update. A late payment penalty is 1% of the unpaid tax per month, up to 25%. The guide also describes willful tax evasion as a felony with fines of up to $100,000 for individuals or $500,000 for corporations and up to 5 years in prison. Those figures are higher than the ones printed on the 2016 form, so confirm with DOR which apply to your situation.

When does a Massachusetts resale certificate not work?

A Massachusetts resale certificate does not work in several situations named by DOR:

• Tobacco products. Sales Tax Resale Certificates are invalid for the sale or purchase of tobacco products, according to the DOR sales and use tax guide.
• Customers without nexus in Massachusetts. A business with nexus in Massachusetts cannot accept Form ST-4 from a customer that has none. The DOR guide says the business can accept a statement on the customer’s letterhead, or with a business card attached, signed under the pains and penalties of perjury.
• Drop shipments. A Massachusetts business that ships goods to a Massachusetts consumer for an out-of-state retailer without nexus may accept a notarized statement on that retailer’s letterhead, the DOR guide says, but not Form ST-4.
• Manufacturing and exempt organizations. The notice on Form ST-4 sends manufacturers to Form ST-12 and tax-exempt organizations to Form ST-5.
• Telecommunications services. 830 CMR 64H.8.1(4)(f) points to a separate regulation, 830 CMR 64H.1.6.

What should you recheck before you act?

Each item below was checked on November 13, 2026, and can change.

• The 6.25% sales and use tax rate and the 1% monthly penalty: DOR sales and use tax guide on mass.gov (page dated May 7, 2026).
• The current revision of Form ST-4. The copy on mass.gov on November 13, 2026 was Rev. 8/16; check the DOR sales and use tax forms list for a newer one.
• The fine and prison figures for misuse, which differ between Form ST-4 and the DOR guide: call DOR at (617) 887-6367 or 1-800-392-6089 (toll-free in Massachusetts).
• How a blanket certificate works and how long a supplier must keep Form ST-4. The form says permanent tax records; the DOR guide says sales tax records are kept at least 3 years from the date the return was filed or due.

This guide is general information, not legal or tax advice. Rules and fees change; confirm the current requirements with the agency named before you file or pay.

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