In Iowa, a legitimately exempt sale becomes the seller’s tax liability at audit when the exemption certificate is missing or invalid. Under Iowa Code section 423.45(4)(b), the seller owes the uncollected tax unless it holds a valid certificate stating the purchase is for a nontaxable purpose. The governing document is the Iowa Sales/Use/Excise Tax Exemption Certificate (form 31-014), published on the Iowa Department of Revenue (IDR) Common Forms page.
You register and manage the permits behind that certificate in GovConnectIowa, the state’s official portal for registering, filing, and managing tax permits. GovConnectIowa launched November 16, 2021, and replaced the former eFile & Pay system, per the Iowa CIO’s rollout bulletin. Commenda automates the collection and validation of these certificates. This guide covers who qualifies, what a valid certificate needs, and how long to keep it.
What Is the Iowa Sales Tax Exemption Certificate (Form 31-014)?
Iowa uses one form, the Iowa Sales/Use/Excise Tax Exemption Certificate (31-014), for every exemption category. Resale, nonprofit, manufacturing, agricultural, and government buyers all complete the same document and select their exemption reason on it, per IDR guidance. The certificate covers sales tax and use tax, so it also exempts qualifying out-of-state purchases used in Iowa.
The current version is form 31-014a, revised September 8, 2025, downloadable as the Iowa Sales/Use/Excise Tax Exemption Certificate PDF. You register the sales tax permit behind a resale claim in GovConnectIowa. A buyer without the required permit cannot make a valid resale claim.
Who Qualifies for a Sales Tax Exemption in Iowa?
Six main categories qualify: buyers purchasing for resale, statutorily enumerated nonprofits, government entities, manufacturers, agricultural producers, and interstate shippers. Each claims the exemption on form 31-014 by selecting the matching reason. The table below shows who qualifies and what each category must document, drawn from IDR guidance and the Iowa Code.
| Exemption category | Who qualifies | Key requirement | Documentation | Source |
|---|---|---|---|---|
| Resale | Retailers, wholesalers, distributors buying inventory to resell | Goods resold as-is or built into a product for sale | 31-014 with Iowa sales tax permit number | IDR Sales and Use Tax Guide |
| Nonprofit | Only statutorily enumerated entities (private nonprofit schools, nonprofit hospitals, hospices) | Falls within Iowa Code \423.3 or \423.4 categories | 31-014 with the entity category selected | IDR Nonprofit Entities guidance |
| Government | Federal, state, county, municipal entities | Direct purchase for official use, billed to the entity | 31-014 or exemption letter | IDR Sales and Use Tax Guide |
| Manufacturing | Manufacturers processing tangible goods for sale | Machinery and equipment used directly and primarily in processing | 31-014 with manufacturing reason | Iowa Code \423.3(47) |
| Agricultural production | Farmers and producers | Inputs and machinery used directly and primarily in production for sale | 31-014 with agricultural reason | Iowa Code \423.3 |
| Interstate commerce | Sellers shipping out of Iowa | Goods delivered to an out-of-state address | Shipping records, bills of lading, invoices | IDR Sales and Use Tax Guide |
How Does the Iowa Resale Certificate Work?
Retailers, wholesalers, and distributors buying inventory for resale complete form 31-014 with their Iowa sales tax permit number, and the seller keeps it on file. If the business later pulls an item from that inventory for its own use, Iowa treats the withdrawal as a taxable use and requires self-reported use tax on the item’s cost, per IDR manufacturing and processing guidance.
Are Nonprofits Automatically Exempt From Iowa Sales Tax?
No. Iowa does not grant nonprofits a blanket exemption based on 501(c)(3) status, and the IDR states nonprofits are not automatically exempt even when they hold federal and state income tax exemption. Only statutorily enumerated entities qualify, such as private nonprofit educational institutions and nonprofit hospitals. Churches and most other nonprofits pay Iowa sales tax on purchases.
Iowa Code section 423.4 names the qualifying categories, including private nonprofit educational institutions, nonprofit hospitals licensed under Iowa Code chapter 135B, nonprofit hospices, private nonprofit museums, and Iowa Habitat for Humanity affiliates for building materials. For other nonprofits, a sale is exempt only when the proceeds fund educational, religious, or charitable purposes and the organization holds 501(c)(3) status, per IDR Nonprofit Entities guidance. Iowa does not issue a generic exemption number to every nonprofit.
What Qualifies for Iowa’s Manufacturing Equipment Exemption?
Machinery, equipment, computers, replacement parts, and supplies qualify when used directly and primarily in processing tangible personal property for sale, under Iowa Code section 423.3(47). The scope also covers quality-control testing and research and development equipment. The “directly and primarily” test is the audit battleground when equipment serves both exempt and non-exempt uses.
The replacement-parts and supplies portion of the exemption took effect July 1, 2016 under 2016 Iowa House File 2433, per IDR manufacturing and processing guidance.
Is Energy Used in Manufacturing Exempt in Iowa?
Yes. Fuel and electricity consumed by exempt manufacturing equipment are exempt under the same processing rules, per Iowa Administrative Code rule 701-215.14. The exemption does not cover energy used for general heating, ventilation, or lighting. This is a commonly missed claim, and many manufacturers recover it through a utility study.
Which Purchases Qualify for Iowa’s Agricultural Production Exemption?
Seed, feed, fertilizer, qualifying chemicals, and farm machinery used directly and primarily in agricultural production for sale qualify, claimed on form 31-014 with the agricultural reason selected, per Iowa Code section 423.3. Buildings, general-purpose vehicles, and personal or household items do not qualify. The “directly and primarily in production” test mirrors the manufacturing standard the IDR applies.
Are Government Purchases Exempt From Iowa Sales Tax?
Yes, for direct purchases by federal, state, county, and municipal entities for official use, per the IDR Sales and Use Tax Guide. The entity must be billed and pay directly. An employee who pays personally and later gets reimbursed does not qualify, so the exemption fails whenever the government is not the direct payer.
Are Out-of-State Deliveries Exempt From Iowa Sales Tax?
Yes. Goods shipped from Iowa to an out-of-state address are not subject to Iowa sales tax, per the IDR Sales and Use Tax Guide. The seller must keep shipping records, such as tracking data and bills of lading, plus invoices showing the destination. The buyer’s destination state may still tax the sale, so review your exposure with the Commenda US nexus guide.
How Do You Get an Iowa Sales Tax Exemption Certificate?
Four steps get you a valid certificate. Register for an Iowa sales tax permit if you buy for resale, download the form, complete it, and hand it to the seller. The certificate itself needs no state filing or approval.
- Register for an Iowa sales tax permit in GovConnectIowa using Iowa Business Tax Permit Registration form 78-005 (current version 78-005a, revised June 26, 2025).
- Download form 31-014 from the IDR Common Forms page.
- Complete it with your exemption reason.
- Give it to the seller at the time of purchase.
Iowa consolidated sales and use tax permits into a single filing system effective July 1, 2022, per IDR guidance, so one GovConnectIowa registration now covers both sales and use tax.
What Information Must a Valid Iowa Exemption Certificate Include?
A valid certificate needs the buyer’s legal name and address, the seller’s name and address, the Iowa sales tax permit number (if applicable), the exemption reason, a description of the purchase, the purchaser’s signature, and the date. The seller must obtain it within 90 days of the sale. The table below details each requirement and its source.
| Required field | Requirement | Source |
|---|---|---|
| Buyer legal name and address | Identifies the exempt purchaser | IDR form 31-014 instructions |
| Seller name and address | Identifies who retains the certificate | IDR form 31-014 |
| Iowa sales tax permit number | Required for resale claims | IDR Sales and Use Tax Guide |
| Exemption reason | Category selected on the form | IDR form 31-014 |
| Description of purchase | Shows the goods match the reason | IDR form 31-014 |
| Purchaser signature and date | Signed under penalty of perjury | Iowa Code \423.45(4)(b) |
| Timing | Completed and in effect within 90 days of sale | Iowa Admin. Code r. 701-209.1 |
| Blanket date range (if used) | Covers recurring purchases | Iowa Admin. Code r. 701-209.1 |
What Is a Blanket Exemption Certificate in Iowa?
A blanket certificate covers recurring purchases of the same type between one buyer and one seller. Under Iowa Administrative Code rule 701-209.1 and the form’s own instructions, it stays valid until the purchaser cancels it or until 12 consecutive months pass with no purchases between the parties. Sellers must confirm each later purchase fits the stated scope.
How Do You Validate Resale Certificates in Iowa?
Run three checks. Confirm the certificate is complete against the required-fields list. Verify the Iowa sales tax permit number is active through the IDR lookup in GovConnectIowa. Confirm the stated exemption reason plausibly matches what the buyer is purchasing. A resale reason claimed on a job-site consumable, for example, should prompt a question before you accept it.
How Long Must Iowa Sellers Keep Exemption Certificates?
Keep certificates at least three years after the last transaction they cover. Iowa’s record-keeping rules require businesses to retain exemption documentation for a minimum of three years, and electronic formats are accepted. Certificates have no fixed expiration, but IDR practice supports revalidating every three years or whenever buyer information changes.
| Rule | Requirement | Source |
|---|---|---|
| Minimum retention | 3 years after the last transaction | IDR Sales and Use Tax Guide record-keeping rules |
| Designated exempt entity contracts | Retain at least 3 years | IDR Construction Contracts guidance |
| Format | Paper or electronic, if complete and producible at audit | IDR Sales and Use Tax Guide |
| Expiration | No fixed expiration; revalidate every 3 years (best practice) | IDR practice and form 31-014 |
| Blanket certificate lapse | Voids after 12 months with no purchases, or on cancellation | Iowa Admin. Code r. 701-209.1 |
Paper and electronic certificates carry equal weight in Iowa. Both formats are acceptable when they are complete, secure, and producible at audit.
Does Iowa Accept the Streamlined Sales Tax Exemption Certificate?
Yes. Iowa is a member of the Streamlined Sales and Use Tax Agreement (SSUTA), so sellers can accept the multistate Streamlined Sales Tax (SST) exemption certificate from out-of-state buyers, per the Streamlined Sales Tax Governing Board. This matters in drop-shipment deals, where an out-of-state reseller with no Iowa permit can still claim resale using the SST certificate. It is the key path for ecommerce and multistate sellers.
What Happens If You Cannot Produce a Certificate at an Iowa Audit?
The seller becomes liable for the uncollected tax, plus penalties and interest, even when the buyer was genuinely exempt. Under Iowa Code section 423.45(4)(b), liability shifts to the seller without a valid certificate. If you miss the 90-day window to obtain one, Iowa allows 120 days to otherwise prove the sale was exempt before the tax becomes yours, per Iowa Administrative Code rule 701-209.1.
For example, a building-supply company accepts a resale certificate from a contractor who consumes the materials on job sites instead of reselling them. At audit, the IDR disallows the exemption and assesses the back tax against the supplier. Sellers assessed penalties can request relief through the IDR Penalty Waiver form on the Common Forms page, filed through GovConnectIowa.
What Are the Most Common Iowa Exemption Certificate Mistakes?
Four mistakes cause most exemption failures at Iowa audits.
- Accepting a certificate missing the permit number or exemption reason.
- Accepting a certificate that does not match the purchase.
- Using a resale certificate for internal-use goods.
- Losing certificates during staff or system transitions.
How Commenda Automates Iowa Exemption Certificate Collection
Commenda’s indirect tax platform collects exemption certificates digitally at checkout or by request, validates them against state rules, stores them securely and searchably, and flags missing or stale certificates before an audit does. A buyer self-service portal, bulk request campaigns, a review-and-approve workflow, and expiry alerts keep renewals off your manual to-do list. It connects to 100+ ERP, API, and custom integrations.
For Iowa rates and filing rules, see the Commenda Iowa sales tax guide. To size your exposure across states, use the Commenda US nexus guide. Book a demo for a free review of your exemption certificate audit exposure.
