By state

Security deposit laws by state

Deadlines run from 14 to 30 days depending on where you rent. The penalties differ far more than the deadlines do.

New York
14 days · N.Y. Gen. Oblig. Law § 7-108
California
21 days · Cal. Civ. Code § 1950.5
Texas
30 days · Tex. Prop. Code §§ 92.103, 92.104, 92.109
Florida
30 days · Fla. Stat. § 83.49
Illinois
30 days · 765 ILCS 710/1
Pennsylvania
30 days · 68 P.S. § 250.512
Ohio
30 days · Ohio Rev. Code § 5321.16
Georgia
30 days · O.C.G.A. §§ 44-7-34, 44-7-35, 44-7-36
North Carolina
30 days · N.C. Gen. Stat. §§ 42-52, 42-55
Michigan
30 days · Mich. Comp. Laws §§ 554.609, 554.611, 554.613

More states in progress. Each is read from the operative statutory text and cross-checked against a second source before publication.