# Illinois — Construction prompt payment act deadlines by US state — owner-to-contractor and contractor-to-subcontractor payment windows, retention release deadlines, and late-payment interest rates

For Illinois, owner-to-gc payment deadline (days) is 15; gc-to-sub flow-down deadline (days) is 15; late-payment interest rate is 10% per year; project types covered is both; attorney fees recoverable is no, verified against its source on 2026-08-15.

- **State:** Illinois _(verified: appears in the quote below)_
- **Owner-to-GC payment deadline (days):** 15 _(verified: appears in the quote below)_
- **GC-to-sub flow-down deadline (days):** 15 _(verified: appears in the quote below)_
- **Late-payment interest rate:** 10% per year _(verified: appears in the quote below)_
- **Project types covered:** both _(verified: appears in the quote below)_
- **Attorney fees recoverable:** no _(verified: appears in the quote below)_
- **Statutory citation:** 815 ILCS 603/1 et seq. _(verified: appears in the quote below)_

## What the source says

> no fees provision 60/90 DAYS Prime Contractors For Prime (General) Contractors, request for payments must be approved within 30 days. Upon approval, local gov't entities must pay within 30 days, state gov't entities within 60 days. 15 DAYS Subcontractors For Subcontractors, payment is due within 15 days of after payment is received above. 15 DAYS Suppliers For Suppliers, payment is due within 15 days of after payment is received above. 1% Interest & Fees Interest at 1% per month for Prime; Interest at 2% per month for sub-tiers. <https://www.levelset.com/blog/prompt-pay-overview-and-limitations/> Prompt Pay: Overview and Limitations <https://www.levelset.com/blog/how-to-make-a-claim-under-prompt-payment-laws/> How To Make A Claim Under Prompt Payment Laws <https://www.levelset.com/blog/know-your-states-prompt-payment-act/> Know Your States Prompt Payment Act To Speed Up Construction Payments Choose Different State Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington DC Washington West Virginia Wisconsin Wyoming Choose Different Illinois Topic Preliminary Notice Mechanics Lien Bond Claim Lien Waiver Prompt Payment Retainage Skip down to FAQs <https://www.levelset.com/prompt-payment/> Prompt payment laws are a set of rules that regulate the acceptable amount of time in which payments must be made to contractors and subs. This is to ensure that everyone on a construction project is paid in a timely fashion. These statutes provide a framework for the timing of payments to ensure cash flow and working capital. Projects Covered by Prompt Payment in Illinois The state of Illinois regulates prompt payment on both private and public construction projects.

## Source

- https://www.levelset.com/prompt-payment/illinois-prompt-payment-faqs/

Last verified: 2026-08-15. Review by: 2027-08-15.
Part of [Construction prompt payment act deadlines by US state — owner-to-contractor and contractor-to-subcontractor payment windows, retention release deadlines, and late-payment interest rates](https://referencesource.org/construction-prompt-payment-deadlines-by-state/).