Credit Portfolio Monitoring: What to Track

Most of the attention in credit goes to approval — a single point in time. Risk, though, is continuous: the customer approved today can be in a completely different position in six months. Monitoring is what turns credit into a living process, and it is where most of what gets lost to inertia is won back.

What to monitor

Monitoring works in three layers, at different frequencies:

Layer 1: the customer

• Current past-due balance and lateness history
• Limit utilization
• Change in purchase volume
• New judgments, liens and collection filings
• Ownership or entity status changes

Layer 2: the portfolio

• Total delinquency and delinquency by aging bucket
• Concentration by customer, corporate family, industry and region
• Days sales outstanding
• Distribution across risk tiers

Layer 3: the cohort

• Performance of customers approved in each period
• Comparison across cohorts to detect loosening criteria

Cohort reading is the only one that separates "the portfolio got worse" from "our underwriting got worse." The method is in vintage analysis.

Frequency

Event-driven monitoring — an alert fired when something changes — is more efficient than periodic sweeps, and it is what lets you react in days instead of months.

Concentration: the risk nobody sees coming

A portfolio that looks healthy in aggregate can hide dangerous concentration. Always measure:

• Share of receivables in the top 10 customers
• Share in the largest corporate family
• Share in the largest industry served

Attention thresholds: when a single customer passes 5% of total receivables, or the top 10 pass 40%, the book is no longer diversified — and one isolated event becomes a structural problem.

Signs a customer is deteriorating

• Growing lateness, even with full payment
• Requests to extend a due date or restructure
• A sharp drop or an atypical spike in purchases
• Frequent turnover in their accounts payable contact
• Partial payments outside the normal pattern
• A burst of credit inquiries from many suppliers

None is conclusive alone; combined, they lead delinquency by weeks. Alert design is covered in early warning signs of customer credit risk.

A minimum routine that works

1. Daily past-due report by aging bucket
2. Automatic alert on derogatory events for active accounts
3. Monthly portfolio meeting: delinquency, concentration, largest exposures
4. A limit review cycle with a fixed calendar
5. Quarterly cohort report

A small operation can run this in a spreadsheet; what does not work is having no routine at all — monitoring that depends on someone remembering does not happen.

Who owns monitoring

Credit watches, sales works the customer, finance executes collections. The usual failure is assuming monitoring belongs to accounts receivable: by the time the data reaches AR, the delinquency already happened. Credit's job is to watch what comes before the delinquency.

What to take from this

Monitor in three layers — customer, portfolio, cohort — prefer event alerts over periodic sweeps, and treat concentration as a permanent metric. The credit decision does not end at approval: it is revisited for as long as the exposure exists.