First-payment default is an origination defect, not a collections event

First-payment default is the failure of a newly funded loan to pay its first contractual instalment. Treat it as a defect report on origination, not the opening of a collections case. Borrowers whose circumstances collapse inside 30 days of drawdown exist but are rare; the common causes sit behind the decision — an instrument never lodged, a due date set before the borrower is paid, a payment that arrived and was never matched, income that was never there in the size underwriting believed.

Four choices that decide what the number means

• Which instalment counts. The first contractual instalment, or any first collection attempt — including a part-period charge billed days after drawdown.
• How much grace. Unpaid at the due date, unpaid 5 days later, or unpaid at 30 days past due. Each produces a different rate on identical behaviour.
• What a partial payment does. An instalment paid short by 40 is either a default or a shortfall, and the choice changes the number more than most underwriting changes do.
• How rescheduled dates are treated. A borrower who calls before the first due date and moves it has not defaulted; a lender who books that as a cure has quietly removed the signal it most needed.

Whichever you pick, fix the cohort as loans funded in a month and accept the observation lag. Loans funded in March cannot be assessed until roughly the end of May, so a review treating last month's figure as final is reporting a number that will be revised.

Most cases are setup failures wearing a credit label

• The mandate was never live. Direct debit and standing instruction setups take working days to lodge and are rejected outright on a name or account mismatch. Fund on Friday, bill on Monday, and there is no instrument to collect with.
• The first due date lands before payday. A borrower paid on the last working day of the month, billed on the 25th, misses instalment 1 and pays every one after it.
• The money arrived and was not matched. A transfer with no usable reference sits in unapplied cash while the loan reads as unpaid — the attribution problem solved by virtual accounts and per-payer references.
• The account is not the account. Disbursement went to one account and collection is set against another, or the mandate names a joint account the borrower does not control.
• The income was never there. Where affordability rested on inflows that were transfers, reversed credits or another lender's disbursal, instalment 1 is where arithmetic meets a bank balance — the failure in statement analysis that overstates borrower income.
• A condition was waived to get the file out. Check month-end approvals specifically, and check files that sat for weeks in conditions outstanding twice, because their evidence was stale before funding.

Send each case back to the decision that produced it

1. Open every case within 5 business days of the missed instalment, while the borrower is contactable and the file is fresh.
2. Classify to a cause from a fixed list: instrument, date, attribution, account, income, waiver, genuine deterioration. Free-text notes produce a year of unanalysable cases.
3. Attribute the cause to a stage — verification, decisioning, documentation, boarding or payments — rather than to a person.
4. Attach the decision snapshot: inputs, their as-of dates, rule and model versions, and the reasons recorded at the time — which exists only if it was captured then, as decline reason codes recorded at the moment of decision argues.
5. Report weekly to the owner of the originating step, and require the fix to be a rule, a checklist item or a field validation — then measure the next 2 cohorts against it.

A first-payment default is the loan telling you something about the day it was written, not about the borrower's month.

What the number cannot carry

It is a small-denominator statistic. A lender funding 200 loans a month sees 4 cases one month and 6 the next, and neither supports a policy change. Read it as a trend across cohorts and watch the cause mix rather than the headline: 3 attribution failures in a month that normally has none matters more than a rate moving 1 point.

Nor does it predict eventual loss — many of these cure and pay to term — or say anything about arrears treatment, which is a separate ladder with its own owners. It earns its place by closing the loop between the book and the decisions that made it, the kind of small, high-yield internal tools and ops work that sits inside lending and credit operations, part of the finance systems we build.

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