Modeling the Budgetary Costs of FHA's Single Family Mortgage Insurance: Working Paper 2014-05

This paper presents the simulation model that the Congressional Budget Office (CBO) uses to project the budgetary costs of the Federal Housing Administration's (FHA's) single-family mortgage insurance program. CBO simulates defaults, recoveries, and prepayments on cohorts of mortgages insured by FHA with key parameters estimated from a dataset of FHA-insured mortgages. Those simulations are used to estimate the loan guarantees' subsidy rates, which are the lifetime cost of FHA's insurance claim payments minus fees, expressed as a percentage of the original loan amounts. The simulations are