Seasoning of a pool

When a mutual fund scheme invests in securitised debt — pass-through certificates backed by a pool of loans such as auto finance or home loans — the age and repayment history of that pool matters as much as the borrowers' credit profiles.

Seasoning measures exactly that: how much of the loan pool's scheduled repayments have already happened, on time, without default. A pool that has already proved its borrowers pay reliably is safer than one that has not yet had the chance to prove anything.

Among the risk factors analysed for a securitisation transaction (Chapter 10, section 10.1.3), the workbook pairs original maturity of loans with average seasoning of the pool. Original maturity indicates whether the loan tenors are in line with industry norms and the borrowers' repayment capacity. Average seasoning indicates whether the borrowers have already displayed repayment discipline — a track record the pool has built up simply by surviving to date without default.

The comparison the workbook draws is explicit: a pool of personal loans in which borrowers have already repaid 80 percent of their instalments without default is a superior asset pool to one in which only 10 percent has been repaid, because the former has already demonstrated far higher repayment discipline than the latter.

This sits alongside other pool-characteristic risk factors the workbook lists together — loan size and diversification, the Loan to Value ratio, and the default rate distribution across days-past-due buckets — as the checklist used to judge how safe a securitised pool actually is.

A mutual fund scheme is offered two pass-through certificates backed by pools of personal loans, each with similar credit ratings on paper.

Pool A has already had 80 percent of its scheduled instalments repaid on time, with no defaults recorded so far. Pool B was originated recently and has had only 10 percent of its instalments repaid so far.

Even with similar headline credit ratings, the workbook's logic favours Pool A: its borrowers have already shown, through 80 percent of a full repayment cycle, that they pay as agreed. Pool B's borrowers have not yet had the same opportunity to demonstrate that discipline — the risk of future default is less well-tested, purely because the pool is younger and less seasoned, whatever its rating says today.

Chapter 10 (Risk, Return and Performance of Funds), section 10.1.3, lists seasoning of the pool among the risk factors specific to securitisation transactions, alongside asset-class risk, pool-characteristic risk, and credit rating and enhancement. Expect a question on what "seasoning" measures, and the 80 percent versus 10 percent illustration as a direct comparison.

• Seasoning measures repayment history already completed, not the loans' remaining tenor. Original maturity is the separate, paired risk factor that covers tenor.
• A higher seasoning percentage means lower risk, because it reflects proven repayment discipline, not a longer time still outstanding.
• Seasoning is a pool-characteristic risk factor, distinct from the credit rating of the securitisation itself — a well-rated pool can still be poorly seasoned if it is new.
• This risk factor applies to securitised debt instruments a scheme holds, not to the mutual fund scheme's own units.