Wyoming late fee law

7%per year

Attaches to the debt by operation of law when you agreed no rate, so it accrues before any lawsuit and can be stated on a demand letter.

If there is no agreement or provision of law for a different rate, the interest of money shall be at the rate of 7% per annum. Text corroborated on two reputable secondary statute reproductions (Justia and FindLaw); the official wyoleg.gov statute database was not directly fetchable - verify with counsel.

Section 40-14-106(e) applies only absent an agreement, so parties may contract for a different rate. Wyoming's Uniform Consumer Credit Code (Wyo. Stat. tit. 40, ch. 14) regulates rates on consumer credit only; no general usury cap on non-consumer/commercial B2B credit was found in this research - verify with counsel.

public

Wyo. Stat. § 16-6-602: any public agency (state agencies, counties, municipalities, other public entities) purchasing goods or services from a nongovernmental entity must pay within 45 days of receipt of a correct notice of amount due, or pay interest from the 45th day at 1.5% per month on the unpaid balance until paid, unless a good-faith dispute exists. No general private-commercial prompt-payment act found.

No distinctive Wyoming statute on flat late fees for commercial invoices was found; default principles apply - agreed late fees on B2B invoices are enforceable if reasonable, subject to the liquidated-damages/penalty doctrine, and the absence of a general commercial usury cap minimizes recharacterization risk.