Interest on unpaid invoices in Arkansas: no single rate if none was agreed; at most 17% by agreement (not fully confirmed)

Arkansas's rate when no rate was agreed

Not fully confirmed: from the search listing. Arkansas's free official code is hosted on LexisNexis, and its full sections sit behind a CAPTCHA, so some quotes here are the section text its search results show. Each answer resting only on such a quote says so.

It depends: see A.C.A. 16-65-114 · not fully confirmed: from the official code site's search listing. A judgment on a contract bears post-judgment and, where appropriate, prejudgment interest at the contract rate or the Federal Reserve primary credit rate on the judgment date plus 2%, whichever is greater.

Worth knowing: interest on a court judgment · not fully confirmed: from the official code site's search listing. Judgment interest on a contract: Federal Reserve primary credit rate on the judgment date + 2% (or the contract rate if higher), A.C.A. 16-65-114.

• “(a) (1) Except as provided in subdivision (a)(2) of this section, a judgment entered by a court shall bear post-judgment interest and, if appropriate under the facts of the case, prejudgment interest: (A) In an action on a contract at the rate provided by the contract or at a rate equal to the Federal Reserve primary credit rate in effect on the date on which the judgment is entered plus two percent (2%), whichever is greater;” — A.C.A. § 16-65-114(a)(1)(A) (Arkansas Code public access, search result text), read November 6, 2026, from the official code site's search listing

The most you can set in Arkansas

For homeowners and businesses alike: 17% a year. Contracts above the cap are void as to principal and interest (§ 6(b)).

• “The maximum lawful rate of interest on loans or contracts not described in Sections 1 and 2 shall not exceed seventeen percent (17%) per annum.” — Ark. Const. amend. 89, § 3, read November 6, 2026
• “(b) All contracts under Section 3 having a rate of interest in excess of the maximum lawful rate shall be void as to principal and interest and the General Assembly shall prohibit the same by law.” — Ark. Const. amend. 89, § 6(b), read November 6, 2026
• “The parties to a contract may agree in writing to the payment of interest not exceeding the applicable rate of interest, if any, set forth in Arkansas Constitution, Amendment 89 , on money due or to become due.” — A.C.A. § 4-57-104 (Arkansas Code public access, search result text), read November 6, 2026, from the official code site's search listing

Late fees in Arkansas

See the state's words below · not fully confirmed: from the official code site's search listing.

• “Industrial loan institutions are authorized under this chapter to impose a late charge of five cents (5¢) for each default of the payment of one dollar ($1.00), or a fraction thereof,” — A.C.A. § 23-36-112 (Arkansas Code public access, search result text), read November 6, 2026, from the official code site's search listing

Does Arkansas want it agreed in advance?

Agreed in advance: yes, in the cases below · not fully confirmed: from the official code site's search listing. Contract interest must be agreed in writing (A.C.A. 4-57-104).

• “The parties to a contract may agree in writing to the payment of interest not exceeding the applicable rate of interest, if any, set forth in Arkansas Constitution, Amendment 89 , on money due or to become due.” — A.C.A. § 4-57-104 (Arkansas Code public access, search result text), read November 6, 2026, from the official code site's search listing

Homeowners and businesses in Arkansas

Arkansas's own words on it are below.

• “establishing that the maximum lawful rate of interest on any other loan or contract shall not exceed seventeen percent (17%) per annum;” — Ark. Const. amend. 89, § 7 (ballot title), read November 6, 2026

Prompt payment on private construction in Arkansas

Not found in our check for Arkansas.

Work out a late charge in Arkansas

Set your own rate.

What was not checked for Arkansas

• No Arkansas statute setting a rate for an unpaid debt with no agreed rate was found, other than the one on court judgments (A.C.A. 16-65-114).
• A search of Arkansas's code found no prompt-payment law for private construction, only one for public works; that is not proof there is none.

Check Arkansas's own text

Before you charge: read Arkansas's free official code, Code of Arkansas Public Access, and the Arkansas 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 Arkansas with every state's answer, or with its neighbours just below.

Next door to Arkansas

• Louisiana: floats if none agreed, depends by agreement
• Mississippi: 8% if none agreed, depends by agreement (not fully confirmed)
• Missouri: 9% if none agreed, depends by agreement
• Oklahoma: 6% if none agreed, depends by agreement
• Tennessee: up to 10% if none agreed (not fully confirmed)
• Texas: 6% if none agreed, depends by agreement

Official sources for Arkansas

• A.C.A. § 16-65-114(a)(1)(A) (Arkansas Code public access, search result text) — read November 6, 2026 (search listing)
• Ark. Const. amend. 89, § 3 — read November 6, 2026
• A.C.A. § 4-57-104 (Arkansas Code public access, search result text) — read November 6, 2026 (search listing)
• A.C.A. § 23-36-112 (Arkansas Code public access, search result text) — read November 6, 2026 (search listing)

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