There's a certificate that circulates as a "works in 30+ states" shortcut. It's called the MTC Uniform Sales & Use Tax Certificate, and for a wholesale seller it's genuinely useful -- one form, dozens of states, less paperwork chasing.
Louisiana's answer: no.
The state's Department of Revenue is direct -- exemptions are not transferable, and Louisiana does not accept the multi-state certificate. It doesn't accept other states' resale certificates either. If your buyer sells into Louisiana and hands you an MTC form, you are holding a document that does nothing.
And Louisiana isn't done being different
The resale certificate that does work there (Form R-1064) isn't filled out by your buyer at all. The state issues it to registered dealers directly. Your buyer doesn't complete a form -- they receive one.
Every one of them expires -- annually. A Louisiana certificate in your files is always on a renewal clock. "We collected it last year" is not the same as "it's valid today."
The old buyer-completed form (R-1042)? Discontinued. If someone sends you one, they're working from outdated advice. (The full walkthrough — the LaTAP lookup's four inputs, account-number formats, and what an out-of-state buyer can use instead — is in how to verify a Louisiana resale certificate.)
The lesson generalizes past Louisiana: multi-state shortcut forms are real and useful, but acceptance is decided state by state -- and the states that opt out are exactly the ones that will bill you, not your buyer, when a certificate turns out to be invalid in an audit.
If you sell wholesale into Louisiana: ask for the current R-1064, run the state's free LaTAP lookup (it returns the expiration date -- calendar it), and put the renewal on a clock.
Not sure whether a certificate you already hold is the right form for the right state? Our free validator checks the document-level details -- form, fields, ID format, expiration -- with the rule cited behind each one, in about 30 seconds. If you're tracking renewal clocks across more than a handful of accounts, our plans cover the ongoing side.
(General education, not tax advice -- your state's Department of Revenue or a SALT professional is the authority for your situation.)