What is a blanket exemption certificate?

A blanket exemption certificate (also called a continuous exemption certificate) covers all purchases of a qualifying type from a specific buyer during the certificate’s validity period. Instead of collecting a new exemption certificate every time that customer places an order, you collect it once and apply the exemption to every covered transaction until the certificate expires or the buyer’s status changes.

When blanket certificates apply

Blanket certificates work for ongoing relationships where the same exemption claim applies to repeated purchases of the same type. The most common scenario is B2B resellers: a retailer buys your product regularly for resale, provides a resale blanket certificate, and you process every qualifying order exempt without re-requesting documentation.

Other common blanket certificate scenarios:

• Nonprofits with ongoing purchasing relationships
• Government entities making regular procurement purchases
• Manufacturers claiming production exemptions on recurring raw material or component orders
• Businesses with direct pay permits (see: What is a direct pay permit?)

Blanket certificates are generally not appropriate for one-time or occasional purchases where the buyer’s exemption claim isn’t well-established, per-transaction certificates are the safer practice in those cases.

What “blanket” covers and what it doesn’t

The blanket certificate protects the transactions that fall within its scope. Scope is defined by:

Buyer: The certificate applies to purchases from that specific buyer. A new certificate is needed for each distinct customer entity.

Exemption type: The certificate covers the claimed exemption reason. A resale certificate doesn’t cover non-resale purchases the same buyer makes from you.

Product type: The claimed exemption should be consistent with the goods being purchased. A manufacturing exemption certificate covers inputs to manufacturing, not office supplies the same company buys from you.

Validity period: The certificate covers the period for which it was issued. Purchases after expiration are not covered.

State acceptance

SST member states explicitly permit blanket certificates under the Streamlined Sales Tax Agreement: the SST uniform exemption certificate is designed for ongoing use and is valid for 5 years in member states. This covers 24 states with a single form.

For non-SST states, most permit blanket certificates under their own certificate forms or the MTC uniform certificate. A few states have specific requirements, some require that blanket certificates be explicitly designated as “blanket” or “continuous” rather than inferring it from context. Review the state’s guidance when setting up a new exempt account for a non-SST state.

What happens when a blanket certificate expires

Once a blanket certificate expires, it no longer covers future transactions. The obligations at expiration:

1. Stop applying the exemption before requesting renewal, don’t continue exempt treatment while waiting for a new certificate
2. Contact the buyer to request a renewed certificate before or at the time of their next order
3. Collect tax on any orders placed after expiration and before a valid renewed certificate is received
4. Retain the expired certificate for the audit-retention period (typically 3–4 years from the last return it covered)

Building expiration reminders into your account management process (ideally 60 to 90 days before expiration) prevents the gap between expiration and renewal from generating taxable-but-exempt-coded transactions.

The practical advantage

For sellers with significant B2B volume, blanket certificates dramatically reduce per-order compliance friction. Without them, a buyer who places 500 orders per year would theoretically require 500 exemption certificates. With a valid blanket certificate, one form covers the year. The audit documentation requirement is the same; the operational overhead is a fraction of the per-transaction alternative.