Check an electronic resale certificate's completeness, resale purpose, signature, sale coverage and records against applicable state requirements before leaving sales tax off.
Key takeaways
- Compare the document with your state's requirements.
- Resolve missing information with the buyer.
- Check each sale and save the original certificate.
The buyer says the goods are for resale, so you leave sales tax off the invoice. In practice, a certificate that arrives as an email attachment or a link to an e-signature service needs a few more looks before you act on it. Check the state's requirements before relying on the certificate.
This post walks through five checks to run before you leave sales tax off an invoice. They are general steps, not legal advice. Sales tax rules vary by state, and your state's tax agency decides what it accepts. When a rule is unclear, ask that agency or a tax professional before you rely on the certificate.
Why electronic certificates need a closer look
A paper certificate is easy to judge at a glance. You can see the handwriting, the signature, and the date. An electronic certificate can arrive as a PDF with no visible signature, a typed name in the body of an email, or a link that opens a form you cannot save. New York permits electronic exemption certificates. It does mean you have to check the same things you would check on paper, and check how the document was signed.
Some state agencies address electronic documents directly. The New York State Department of Taxation and Finance says that sales tax exemption certificates may also be issued and accepted electronically. Its guidance also cites TSB-M-07(1)S, Electronic Resale and Exemption Documents for Sales and Compensating Use Taxes by name, so the electronic version of these documents is a topic that agency addresses directly. The lesson is not specific to New York. Electronic acceptance is a permitted path in some places, and it comes with conditions that you should look up for your state.
Keep one idea in mind through the rest of this post. The certificate is the buyer's statement, but the record of the sale is yours. If the certificate is missing something, ask the buyer to correct it.
Check 1: Confirm the form is complete
Start with the document itself. Open it and read every field before you look at anything else. You are looking for the buyer's legal business name, the buyer's address, and any registration or permit number the form asks for. You also want a description of the purchase, a date, and the buyer's signature block.
If your state publishes an official resale certificate form, compare the document against it. If a certificate uses different wording or skips sections, check whether your state permits that form. Your state's tax agency can tell you whether a substitute form is allowed.
A blank field is a reason to ask, not a reason to fill it in yourself. Do not type the missing business number into the form on the buyer's behalf. Send the document back and ask the buyer to complete it and sign it. This keeps the record clear: the buyer supplied the information, and the buyer stood behind it.
Watch for forms that cover more than one purchase. Read the form's scope. If it says it covers a specific purchase, check state requirements before applying it to another order.
Check 2: Make sure it says the goods will be resold
A resale certificate exists for one purpose. It tells you the buyer is purchasing items to resell them in the normal course of business, rather than to use them. Texas says the certificate should state that all purchases will be resold in the regular course of business. Read the statement of purpose line by line. Check intended use rather than assuming an item category establishes resale purpose.
Be careful with vague wording. A certificate that says "for business purposes" or "for resale or other use" does not clearly support leaving tax off the sale. The point of the check is to see a clear statement that the goods will be resold. If you cannot find one, treat the certificate as incomplete.
Also consider what the buyer actually sells. A buyer who runs a retail store and buys merchandise to resell fits the purpose. A buyer who sells services, or who buys a mix of inventory and tools, may need a different approach. Do not assume that a buyer's business type settles the question for every line on the invoice. The certificate and the buyer's actual activity should agree.
Check 3: Verify the signature
Check the signing method against state requirements.
The California Department of Tax and Fee Administration addresses this in its guidance on resale certificates. It states that a "digital signature" has the same force and effect as a manual signature and may be used on a resale certificate provided it meets the requirements of California Government Code section 16.5, and its implementing regulations. The important part is the condition at the end. A digital signature counts only when it meets the legal requirements that the state sets. A signature on a document is not automatically one of them.
In practice, look at how the signature was made. A signature from a recognized e-signature service, with a record showing who signed and when, is a different thing from a typed name in an email reply. If the signature came through a service, check whether the service keeps a record of the signing event. A certificate you cannot trace back to a signing event is harder to defend later. See the related e-signature signing and timing checks.
Next, ask whether the person who signed has the authority to do so for the buyer. Check your state's authorized-signer requirements. If the signer is a salesperson at the buyer's company, or someone whose role you cannot identify, ask the buyer to confirm who is authorized to sign for the business.
Finally, check that the signature is actually there. If only a typed name appears, check whether the signing method meets state requirements. Ask for the signed version.
Also watch for the delivery itself. Before you open a signing link, confirm the request came from a contact you know at the buyer's business, using an address or phone number you already have on file rather than one in the message.
Check 4: Match the certificate to the sale
A valid certificate can still fail on the wrong invoice. Before you leave tax off, compare the certificate against the sale in front of you.
Start with the items. Each line on the invoice should fit the purpose the buyer stated. If the buyer's certificate covers merchandise for resale, and your invoice includes tools for its own shop, check those items' treatment. Split the invoice when you need to. Apply the relevant taxability and exemption rules to each line.
Next, check the dates. Confirm the certificate is current for the sale date. Check whether the applicable form or state imposes date limits. If your state or the form sets an expiration, make sure the sale falls inside it. If the form has no clear date terms, record the date you received it and the date of the sale, so you can show the timing later.
Then check location and delivery. Determine which jurisdiction's rules apply. The rules are not the same everywhere. Ask your state's tax agency how location and delivery point affect the result before you apply the exemption to a sale that ships out of state or to a different address.
Last, check the seller side. Make sure your records show the sale and the certificate as a pair. If you cannot tie the certificate to a specific invoice, you will have trouble showing later that the exemption applied to that sale.
Check 5: Keep a record you can defend
Check completeness and signing at intake; review scope, dates and covered items for each sale. The fifth one protects you for years. A certificate you accepted correctly is only useful if you can produce it when someone asks.
Save the original file. Do not rely on a screenshot, a forwarded email summary, or a copy you retyped. If the certificate came as a PDF, keep the PDF as it arrived. If it came through an e-signature service, keep the completed document and any record the service provides of the signing. Store these with the invoice or in a folder that you can search by customer name and date.
Write down when you received the certificate and who sent it. A short note in your accounting system works well. It takes a minute and can save hours later. Include whether you verified the signature, what you checked, and who on your team approved the exemption. If a reviewer asks why you left tax off an invoice, this note shows that you made a deliberate decision.
Keep records for as long as your state requires. Retention rules differ, so look up the period that applies to your business rather than relying on a number from another state or from a rule of thumb. Because electronic files are easy to lose during a computer replacement or an email migration, make a backup copy in a second location.
If you find a problem later, act on it. Suppose you realize the certificate was incomplete or the signature did not meet your state's requirements. Do not quietly change the record. Note what you found, contact the buyer, and ask for a corrected certificate. Then talk to a tax professional about whether the tax needs to be charged for past sales and how your state handles corrections.
Illustrative example: Review a mixed invoice
Suppose a furniture shop emails you a resale certificate as a PDF and asks you to leave tax off a single invoice. The invoice has three lines: a set of dining chairs the shop plans to sell, a case of wood finish and brushes the shop uses to refinish pieces, and a delivery charge.
The registration number field is blank. Send it back and ask the shop to complete it. The purpose line says the goods are bought for resale. Check the treatment of the finish and brushes and the applicable delivery-charge rule. Ask for a signed copy through a method your state accepts.
For Check 5, once a complete and signed certificate arrives, save the file as it came, note the date and sender, and attach that note to the invoice.
When to stop and check the tax treatment
Most of these checks end in one of two places. Resolve deficiencies and check the applicable state's exemption and collection requirements. A failed check calls for review.
Resolve missing information, unclear purpose, signing questions or an invoice mismatch before relying on the certificate. Tell the buyer why. A short, plain explanation works better than a long one. For example, explain that a required field is missing and you are checking the state's collection and certificate-timing rules.
If the buyer later sends a valid certificate for the same sale, ask your state's tax agency or your tax advisor how the correction should be handled. New York allows a sales tax refund application using Form AU-11. Do not assume the right answer without checking.
Do not accept a verbal promise. A buyer who says the certificate is on the way, or who says the purchase is for resale, has not given you a certificate. Check the applicable state's collection and certificate-timing requirements.
A quick checklist for your next certificate
Use this list as a shortcut each time a certificate arrives by email or e-signature.
- Complete: Every required field is filled in by the buyer, including the business name, address, and any registration number the form asks for.
- Resale purpose: The form clearly says the goods will be resold, and the items on the invoice fit that purpose.
- Valid signature: The signature was made in a way your state recognizes, the signer is authorized; retain a signing record as a documentation practice.
- Matches the sale: Check the applicable date requirements and each line you are exempting.
- Kept on file: You saved the original, noted when and how you received it, and stored it where you can find it later.
Resolve unchecked items and consult applicable state requirements.
Where to go for your state's rules
Use these checks as a suggested workflow subject to state requirements. Start with your state's sales tax agency. New York addresses electronic exemption certificates, and California addresses digital signatures on resale certificates. Look for the specific page on exemption certificates and read it before you update your invoicing process. If you are unsure how a rule applies to your business, a tax professional who knows your state can answer in a short call. For related billing questions, see sales tax rules for invoices.
Bookkeepers can also help by building these checks into the workflow. A simple intake step for every certificate, with a checklist, a saved copy, and a note in the customer record, helps organize review and records. The goal is not to make certificates harder to accept. It is to make sure every exemption you grant can be explained and defended.
Electronic certificates are convenient for buyers and sellers alike, and they are not going away. The extra few minutes you spend on these checks are worth it.
Today, open a certificate beside its invoice and identify any missing information to resolve before relying on it.
Questions about electronic certificates
Can New York accept an electronic certificate?
Yes, New York permits sales tax exemption certificates to be issued and accepted electronically.
Does a digital signature qualify in California?
Yes, when it meets California Government Code section 16.5 and its implementing regulations.