Estimating the Minimum Risk Maturity Gap: Some Evidence from the Savings and Loan Industry

The common view of many regulators and practitioners is that the minimum risk maturity gap is equal to zero. However, because of the interest sensitivity of such non‐gap items as the average spread between asset and liability rates, lending activity, fee income and prepayments, the minimum risk gap could be significantly different from zero. We formulate and test a model for a sample of four hundred and twenty six thrift institutions. The results strongly suggest that the minimum risk maturity gap is positive for the average firm in the sample and that there is substantial cross‐sectional variability in the ratio of the minimum risk gap to assets. This suggests that attempts to regulate interest rate risk using a uniform gap as a benchmark are misdirected. Finally, we provide some evidence that there is, in fact, a positive cross‐sectional relationship between measured maturity gap positions and our estimates of the minimum risk maturity gap.