Iowa Sales Tax Exemption Certificates - How to Use and Validate Exemption Certificates

Sep 19, 2026

Explains how Iowa sales tax exemption certificates work when normally taxable items or services are sold tax free. Covers the required completion and signatures by purchasers, retention rules for sellers, and the role of the purchaser’s sales tax permit number. States that Iowa does not issue sales tax “exemption numbers,” emphasizes “good faith” acceptance by sellers, and describes audit consequences and when transactions must be taxed. Lists common exemption categories such as resale, processing, leasing, qualifying farm and industrial machinery/equipment/computers, direct pay, and private nonprofit educational institution exemptions.

LanguageEnglish

CategoryForms

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Pages3

Reading Time1 min

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Iowa sales tax exemption certificates

When a seller must accept an exemption certificate

Sales tax “exemption numbers” in Iowa

Completing and retaining the certificate

Blanket exemption certificates

“Good faith” acceptance by sellers

How to determine if a transaction is exempt

Exemption explanations listed on the certificate

IOWA SALES TAX EXEMPTION CERTIFICATES An Iowa Sales Tax Exemption Certificate is required when normally taxable items or services are sold tax free. Usually, these are items for resale or for use in processing, but there are also other reasons for exemption. It is important that the seller knows when to accept an exemption certificate. If audited, theseller will use exemption certificates to support tax exempt sales. A valid certificate taken in good faith will pass the tax burden for unreported sales tax from the seller directly to the purchaser. Sales tax ‘exemption numbers’ are not issued in Iowa The Iowa Department of Revenue does not issue sales tax "exemption numbers" which make purchases by individuals or organizations exempt from sales tax. The purchaser ’s sales tax permit number is not an"exemption number." The purchaser must complete a Sales Tax Exemption Certificate When normally taxable sales are made free of sales or use tax, the seller must require the purchaser to complete and sign a Sales Tax Exemption Certificate. This certificate is a proper record of the taxexempt transaction and must be retained by the seller for at least five years. It identifies the purchaser, the purchaser’s business, the items being purchased and the reason for exemption. The purchaser must sign and date the certificate. The purchaser’s sales tax permit number must be recorded on the certificate if the purchaser is a retailer. Keep all exemption certificates on file for a minimum of five years. A ‘blanket’ exemption certificate is accepted in some cases If the purchaser repeatedly makes tax exempt purchases of similar items or services from the same seller, the seller may accept a blanket exemption certificate. The seller can keep this single certificate on file to cover repeat purchases. The seller must periodically verify that the information on the blanket exemption certificate is accurate and complete. Keep all blanket exemption certificates on file for a minimum of five years. The exemption certificate must be accepted ‘in good faith’ An exemption certificate must be thoroughly completed by the purchaser and accepted in good faith by the seller to be regarded as valid. To satisfy the "good faith" requirement, the seller must reasonably believe that the items or services being purchased will be used in the exempt manner claimed by the purchaser. For example, a prudent businessperson would accept an exemption certificate from a florist purchasing decorative vases for resale. However, if the same florist attempted to buy shoes free of tax, the exemption certificate would not pass the good faith test. In an audit situation, the department will not recognize an exemption certificate which fails to meet the"good faith" test. The seller may be held responsible for any sales tax due from such transactions. The seller must question the purchaser ’s claim of exemption when evidence or circumstances indicate that the items or services purchased will not be used in an exempt manner. If the seller remains unconvinced that the sale is exempt, then the sale should be taxed. The seller is not required to make a tax-exempt sale. This good faith test is also applied, of course, in the case of a blanket exemption certificate. How to determine if a transaction is exempt Most of the reasons which make a transaction exempt from Iowa sales tax are listed on the exemption certificate itself. The instructions on the back of the certificate further clarify these reasons. Below are the exemption explanations found on the back of the exemption certificate. Exemptions: Resale: Any person in the business of selling who is purchasing items to resell may claim this exemption. The purchaser can be acting as either a retailer or wholesaler and may not be required to have a sales tax permit. Retailers who do have a sales tax permit number must enter it in the space provided. Processing: Exempt purchases for processing inclu

FAQs

Is an Iowa “sales tax exemption number” required to make a purchase tax-exempt?

No. Iowa does not issue sales tax “exemption numbers” that make purchases exempt from sales tax. A purchaser’s sales tax permit number is not an “exemption number.”

What must the purchaser do to make the exemption certificate valid?

The purchaser must complete the Sales Tax Exemption Certificate and sign and date it. If the purchaser is a retailer, the purchaser’s sales tax permit number must be recorded on the certificate, and the seller must retain it for at least five years.

What does the “good faith” requirement mean for the seller?

The seller must thoroughly complete acceptance in good faith by reasonably believing the items or services will be used in the exempt manner claimed. If the “good faith” test fails, the department will not recognize the exemption during an audit and the seller may be held responsible for sales tax due.

Sep 19, 2026

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