Finance theory suggests that leases and debt are substitutes. Surprisingly, however, prior empirical research using jinancial statement data has been unable to verify this trade-off between the two forms ofjinancing. This study re-examines the issue of substitutability by comparing changes in lease and debt jinancing over a six-year horizon for a large sample of US. jirms. The empirical results strongly support the theoretical contention that leases and debt are substitutes and is thus consistent with evidence from surveys of lending oficers. There is some evidence, however, thatjirms do not view leases as displacing nonleasing debt on a dollar-for-dollar basis.