What Is a Sales Tax ID Number and Who Needs One?

What a Sales Tax ID Number Is

A sales tax ID number is a state-issued registration number that identifies a business that is authorized to collect and remit sales tax (and, in many states, use tax). It is commonly called a sales tax permit, seller’s permit, sales and use tax permit, resale number, or sales tax license, depending on the state.

This number links your business to a state tax account so the state can track:

• Sales tax collected from customers
• Use tax owed on taxable purchases where sales tax was not charged
• Filing frequency (monthly, quarterly, annually) and due dates
• Compliance history, notices, and account changes

Sales Tax ID vs. EIN vs. State Income Tax Accounts

Businesses often interact with multiple tax identifiers and registrations. A sales tax ID is not the same as a federal EIN, and it is not a substitute for other state tax accounts.

Sales Tax ID (Sales & Use Tax Permit)

• Issued by: State tax authority
• Used for: Collecting and remitting sales/use tax on taxable transactions
• Triggered by: Taxable sales, taxable services (in some states), marketplace rules, and nexus standards

Federal EIN (Employer Identification Number)

• Issued by: IRS
• Used for: Federal tax reporting, payroll tax filings, business banking, and many vendor applications
• Triggered by: Having employees, operating as certain entity types, or other IRS rules

State Withholding/Unemployment/Income Tax Accounts

• Issued by: State agencies (often separate from the sales tax department)
• Used for: Payroll withholding, unemployment insurance, and state income tax reporting where applicable
• Triggered by: Hiring employees, operating in the state, or meeting state thresholds

Who Needs a Sales Tax ID Number?

You generally need a sales tax ID if you sell taxable goods or services and have a sales tax obligation in a state. Exact rules vary by state, but these are the most common situations:

• Retailers and eCommerce sellers selling taxable products to customers in a state
• Wholesalers making sales for resale (often to issue/accept resale certificates)
• Service providers in states where certain services are taxable (repair, installation, digital services, etc.)
• Manufacturers selling direct to consumers or making taxable transfers
• Out-of-state sellers that meet economic nexus thresholds (based on sales revenue and/or transaction volume)
• Businesses with physical presence such as an office, warehouse, employees, inventory, or regular in-state activity

Common “Nexus” Triggers That Create a Sales Tax Requirement

• Physical nexus: Office, store, warehouse, inventory, employees, or contractors in the state
• Economic nexus: Exceeding a state’s sales/transaction threshold
• Marketplace nexus: Selling through a marketplace that may collect tax on your behalf, while you may still have registration or reporting duties in some states
• Affiliate/referral nexus: In-state affiliates or referral arrangements that meet state criteria

Who Usually Does NOT Need One?

Many businesses do not need a sales tax ID because they do not make taxable sales or do not have a sales tax obligation in a particular state. Common examples include:

• Businesses selling only non-taxable services in a state where those services are exempt
• Businesses selling only exempt goods (for example, certain prescription items) depending on state rules
• Businesses selling exclusively to resellers where all sales qualify as resale and are properly documented (state rules vary)
• Businesses with no nexus and no in-state sales tax obligation

Even when sales are exempt, some states still require registration if you make sales into the state, issue exemption documentation, or need to file “zero returns.”

What You Can Do With a Sales Tax ID

A sales tax ID supports day-to-day operations and compliance, including:

• Collecting sales tax at the correct rate and on the correct items
• Filing sales and use tax returns on time (even for periods with no sales, if required)
• Buying inventory for resale using resale or exemption certificates where allowed
• Providing documentation to marketplaces, payment processors, and wholesale suppliers
• Managing local tax obligations in states with local registrations or special district taxes

How to Get a Sales Tax ID Number

Sales tax IDs are issued at the state level. While the steps differ slightly by state, the process typically includes:

1. Confirming taxability and nexus: Identify where you have an obligation to collect tax.
2. Choosing your business structure: Sole proprietor, LLC, corporation, partnership, etc.
3. Gathering business details: Legal name, DBA, addresses, ownership info, start date, NAICS code, and expected sales volume.
4. Registering with the state: Apply online through the state’s tax portal or registration system.
5. Setting up collection and filing: Configure point-of-sale/eCommerce settings, product taxability, and filing calendar.

Information Many States Ask For

• Business legal name and any DBA/assumed name
• Business entity type and formation state
• Federal EIN or Social Security Number (varies by entity type and state)
• Business address and mailing address
• Owner/officer names, titles, and contact information
• Business start date and first taxable sale date
• Estimated monthly taxable sales
• Products/services sold and sales channels (in-store, online, wholesale)

Ongoing Responsibilities After You Register

Getting a sales tax ID is the beginning of the compliance cycle. Key ongoing responsibilities typically include:

• Charging the correct tax: Apply state and local rules, including destination-based sourcing where applicable.
• Tracking exempt sales: Maintain exemption and resale certificates and related documentation.
• Filing returns on schedule: Submit returns for each period required, even when no tax is due if the state requires it.
• Remitting tax collected: Pay on time to avoid penalties and interest.
• Updating your account: Report address changes, ownership changes, additional locations, or business closure.

Many businesses also coordinate sales tax registration with other compliance needs such as business licenses and permits to ensure all operational requirements are covered.

Multi-State Sales: When You May Need More Than One Sales Tax ID

If you sell into multiple states, you may need multiple sales tax IDs—one for each state where you have nexus. This is common for:

• Online sellers shipping across state lines
• Businesses storing inventory in third-party warehouses
• Companies with remote employees in multiple states
• Businesses expanding into new locations or pop-up events

For state-specific registration and filing expectations, it helps to review the rules that apply where you operate. For example, if you do business in New England, understanding Rhode Island sales tax requirements can clarify registration triggers and ongoing filing duties.

FAQ: Sales Tax ID Numbers

1) Is a sales tax ID number the same as a resale certificate?

No. A sales tax ID is your state tax account registration. A resale certificate is a document used to claim an exemption when buying items intended for resale. Your sales tax ID may be referenced on resale documentation, but the certificate itself is separate.

2) Can I collect sales tax before I receive my sales tax ID?

In most cases, you should not collect sales tax until you are properly registered and authorized by the state. Register before making taxable sales whenever possible to avoid compliance issues.

3) Do I need a sales tax ID if I only sell online?

Possibly. Online sales can create obligations through physical nexus (inventory, employees, facilities) or economic nexus (meeting sales/transaction thresholds). If you have nexus in a state and sell taxable items to customers there, you typically need to register.

4) If a marketplace collects sales tax for me, do I still need a sales tax ID?

Sometimes. Many states require marketplaces to collect and remit tax on marketplace sales, but you may still need registration for direct sales, to report exempt sales, or to meet state account requirements. Your exact obligation depends on the state and your sales channels.

5) Do nonprofits need a sales tax ID number?

Nonprofits often receive exemptions on certain purchases, but they can still have sales tax responsibilities if they sell taxable goods or services. Some states require nonprofit sellers to register and collect tax unless a specific exemption applies to their sales activity.

6) What happens if I register in a state but have no sales?

Many states still require filing returns for each period assigned to your account, even if you had no taxable sales. Missing “zero returns” can lead to notices, estimated assessments, and penalties.

7) How long does it take to get a sales tax ID number?

Timing varies by state and application method. Some