Interest on unpaid invoices in Wyoming: 7% a year if no rate was agreed; the most you can set depends on the deal

Wyoming's rate when no rate was agreed

7% a year. 7% a year if there is no agreement or provision of law for a different rate. (Judgments: 10% a year, or the contract rate if the parties agreed one.)

• “(e) If there is no agreement or provision of law for a different rate, the interest of money shall be at the rate of seven percent (7%) per annum.” — Wyo. Stat. § 40-14-106(e), read November 6, 2026
• “(a) Except as provided in subsections (b) and (c) of this section, all decrees and judgments for the payment of money shall bear interest at ten percent (10%) per year from the date of rendition until paid. (b) If the decree or judgment is founded on a contract and all parties to the contract agreed to interest at a certain rate, the rate of interest on the decree or judgment shall correspond to the terms of the contract.” — Wyo. Stat. § 1-16-102(a)-(b), read November 6, 2026

The most you can set in Wyoming

For a homeowner: Consumer credit sale of goods or services (amount financed up to $75,000): credit service charge up to the greater of 36% a year on the first $1,000 + 21% above, or 21% on the whole balance; revolving charge accounts: 1.75% a month (monthly billing cycle). Consumer credit sale = seller regularly extends such credit, buyer is not an organization, primarily personal/family/household, payable in installments or with a credit service charge.

For a business customer: It depends: see Wyo. Stat. § 40-14-256. It depends: see Wyo. Stat. §§ 40-14-106(e), 40-14-256.

• “(i) Where the amount financed does not exceed seventy-five thousand dollars ($75,000.00), the equivalent of the greater of either of the following: (A) The total of: Thirty-six percent (36%) per year on that part of the unpaid balances of the amount financed which is one thousand dollars ($1,000.00) or less and twenty-one percent (21%) per year on that part of the unpaid balances of the amount financed which is more than one thousand dollars ($1,000.00); or (B) Twenty-one percent (21%) per year on that part of the unpaid balances of the amount financed.” — Wyo. Stat. § 40-14-212(b), read November 6, 2026
• “(i) If the billing cycle is monthly, the charge may not exceed one and three-fourths percent (1.75%) of the amount pursuant to subsection (b) of this section” — Wyo. Stat. § 40-14-218(c), read November 6, 2026
• “"consumer credit sale" is a sale of goods, services or an interest in land in which: (i) Credit is granted by a person who regularly engages as a seller in credit transactions of the same kind; (ii) The buyer is a person other than an organization; (iii) The goods, services or interest in land are purchased primarily for a personal, family or household purpose; (iv) Either the debt is payable in installments or a credit service charge is made; and (v) With respect to a sale of goods or services, the amount financed does not exceed seventy-five thousand dollars ($75,000.00).” — Wyo. Stat. § 40-14-204(a), read November 6, 2026
• “The parties to a sale other than a consumer credit sale may agree in a writing signed by the parties that the sale is subject to the provisions of this act applying to consumer credit sales.” — Wyo. Stat. § 40-14-256, read November 6, 2026
• “40-14-257. Repealed by Laws 2021, ch. 14, § 3.” — Wyo. Stat. §§ 40-14-257 to 40-14-260, read November 6, 2026
• “(e) If there is no agreement or provision of law for a different rate, the interest of money shall be at the rate of seven percent (7%) per annum.” — Wyo. Stat. § 40-14-106(e), read November 6, 2026

Late fees in Wyoming

What the text says: Consumer credit sales (and refinancing/consolidation): if contracted for, a delinquency charge on an installment not paid in full within 10 days after due, up to the greater of 5% of the unpaid installment or $10; once per installment. Consumer credit sales (Wyo. Stat. § 40-14-204), refinancing and consolidation.

• “(a) With respect to a consumer credit sale, refinancing, or consolidation, the parties may contract for a delinquency charge on any installment not paid in full within ten (10) days after its scheduled due date in an amount not exceeding the greater of: (i) Five percent (5%) of the unpaid amount of the installment; or (ii) Ten dollars ($10.00).” — Wyo. Stat. § 40-14-214(a), read November 6, 2026
• “(b) A delinquency charge under subsection (a) of this section may be collected only once on an installment however long it remains in default.” — Wyo. Stat. § 40-14-214(b), read November 6, 2026
• “"consumer credit sale" is a sale of goods, services or an interest in land in which: (i) Credit is granted by a person who regularly engages as a seller in credit transactions of the same kind; (ii) The buyer is a person other than an organization; (iii) The goods, services or interest in land are purchased primarily for a personal, family or household purpose; (iv) Either the debt is payable in installments or a credit service charge is made; and (v) With respect to a sale of goods or services, the amount financed does not exceed seventy-five thousand dollars ($75,000.00).” — Wyo. Stat. § 40-14-204(a), read November 6, 2026

Does Wyoming want it agreed in advance?

Agreed in advance: yes, in the cases below. The delinquency charge exists only if 'the parties may contract for' it (§ 40-14-214); interest above the 7% default needs an agreement or other provision of law (§ 40-14-106(e)).

• “(a) With respect to a consumer credit sale, refinancing, or consolidation, the parties may contract for a delinquency charge on any installment not paid in full within ten (10) days after its scheduled due date in an amount not exceeding the greater of: (i) Five percent (5%) of the unpaid amount of the installment; or (ii) Ten dollars ($10.00).” — Wyo. Stat. § 40-14-214(a), read November 6, 2026
• “(e) If there is no agreement or provision of law for a different rate, the interest of money shall be at the rate of seven percent (7%) per annum.” — Wyo. Stat. § 40-14-106(e), read November 6, 2026

Homeowners and businesses in Wyoming

Consumer credit sales (buyer not an organization, primarily personal/family/household, up to $75,000 financed) carry the credit service charge caps and the 5%/$10 delinquency-charge limit. The parties to a sale other than a consumer credit sale may agree in a writing signed by the parties that the sale is subject to the provisions applying to consumer credit sales (Wyo. Stat. § 40-14-256).

• “"consumer credit sale" is a sale of goods, services or an interest in land in which: (i) Credit is granted by a person who regularly engages as a seller in credit transactions of the same kind; (ii) The buyer is a person other than an organization; (iii) The goods, services or interest in land are purchased primarily for a personal, family or household purpose; (iv) Either the debt is payable in installments or a credit service charge is made; and (v) With respect to a sale of goods or services, the amount financed does not exceed seventy-five thousand dollars ($75,000.00).” — Wyo. Stat. § 40-14-204(a), read November 6, 2026
• “The parties to a sale other than a consumer credit sale may agree in a writing signed by the parties that the sale is subject to the provisions of this act applying to consumer credit sales.” — Wyo. Stat. § 40-14-256, read November 6, 2026

Prompt payment on private construction in Wyoming

Not found in our check for Wyoming.

Work out a late charge in Wyoming

Starts at Wyoming's 7%, the rate when none was agreed, not a maximum.

What was not checked for Wyoming

• Wyoming was not searched to the end for a prompt-payment law on private construction.

Check Wyoming's own text

Before you charge: read Wyo. Stat. § 40-14-106(e) and the other Wyoming texts quoted on this page, or ask a lawyer. As of November 6, 2026.

This is a plain-words summary of each state's own laws as of November 6, 2026, not legal advice. Rules have exceptions. Check the state's own text, linked on every state's page, or a lawyer before you charge a late fee or interest.

Compare Wyoming with every state's answer, or with its neighbours just below.

Next door to Wyoming

• Colorado: 8% if none agreed, depends by agreement
• Idaho: 12% if none agreed, no general cap found
• Montana: 10% if none agreed, depends by agreement
• Nebraska: 12% if none agreed, 16% for homes (two answers)
• South Dakota: 15% if none agreed, depends by agreement
• Utah: 10% if none agreed, no general cap found

Official sources for Wyoming

• Wyo. Stat. § 40-14-106(e) — read November 6, 2026
• Wyo. Stat. § 1-16-102(a)-(b) — read November 6, 2026

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