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Estimating maturity profiles of nonmaturing deposits

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  • Fidelis Musakwa
  • Eric Schaling

Abstract

Understanding the maturity profiles of nonmaturing deposits is vital to assess a bank’s funding liquidity risk and interest rate risk. Estimating these maturity profiles is, however, difficult because banks experience regular cash inflows and outflows on nonmaturing deposit accounts. As a result, it is hard to ascertain the time origin of each dollar deposit constituting the total outstanding balance of a portfolio of non-maturing deposit accounts. To overcome this challenge, we propose a new method to convert account balance data into deposit lifetime data amenable to survival analysis. This provides a way to infer a nonmaturing product’s maturity profile from a survival model. We demonstrate how the estimated maturity profile can be employed to project the runoff of outstanding balances on nonmaturing deposits. The model is illustrated with a case study on a retail bank savings product in a South African bank in the 1999–2016 period. Our case study results suggest that the proposed model is well suited to estimating the maturity profile of nonmaturing deposits.

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Handle: RePEc:rsk:journ4:6855676
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