Roll rates vs a provision matrix

Both methods start from an ageing report and end with a loss rate for each bucket, so they are easily confused. This guide compares how each works, the data each needs, how quickly each responds to deterioration, and which to choose for different portfolios.

By Mirza Fahad Baig, Chartered Accountant. Reviewed by Hamza Fida, Chartered Accountant. 3 minute read.

Short answer

Roll rate vs provision matrix is a choice between two ways of estimating loss rates by ageing or delinquency bucket. A provision matrix measures, for each bucket at past period ends, how much was eventually written off; roll rate analysis measures how much moves from each bucket to the next each month and multiplies those rates to reach write-off. Both give lifetime loss rates by bucket. Roll rates react faster to changes in payment behaviour but need clean monthly data; a provision matrix is simpler and suits most trade receivables.

At a glance

Provision matrix
Write-offs traced to starting bucket
Roll rates
Monthly movements multiplied
Data, matrix
Quarterly snapshots and outcomes
Data, roll rates
Monthly balances by bucket
Faster to react
Roll rates
Simpler
Provision matrix
Roll rates vs a provision matrixProvision matrix: Write-offs traced to starting bucket; Roll rates: Monthly movements multiplied; Data, matrix: Quarterly snapshots and outcomes; Data, roll rates: Monthly balances by bucket; Faster to react: Roll rates; Simpler: Provision matrix.KEY FACTS AT A GLANCERoll rates vs a provision matrixProvision matrixWrite-offs traced tostarting bucketRoll ratesMonthly movementsmultipliedData, matrixQuarterly snapshots andoutcomesData, roll ratesMonthly balances bybucketFaster to reactRoll ratesSimplerProvision matrixTax BakersRoll rates vs a provision matrixProvision matrix: Write-offs traced to starting bucket; Roll rates: Monthly movements multiplied; Data, matrix: Quarterly snapshots and outcomes; Data, roll rates: Monthly balances by bucket; Faster to react: Roll rates; Simpler: Provision matrix.KEY FACTS AT A GLANCERoll rates vs a provision matrixProvision matrixWrite-offs traced to starting bucketRoll ratesMonthly movements multipliedData, matrixQuarterly snapshots and outcomesData, roll ratesMonthly balances by bucketFaster to reactRoll ratesSimplerProvision matrixTax Bakers
Key facts at a glance, as set out in this guide.

Roll rate vs provision matrix: how do they compare?

Roll rates vs provision matrixRoll rates vs provision matrixTOPICProvision matrixRoll ratesLifetime loss rate by bucketYesYesNeeds monthly dataNot requiredRequiredReacts within a month or twoNot usuallyYesNeeds eventual outcomesRequiredNot requiredCommon for trade receivablesUsuallySometimes
Same goal, different routes, different speed.
Provision matrixRoll rate analysis
Question askedOf balances in this bucket at a past date, how much was eventually lost?What share moves on to the next bucket each month?
Data neededPeriod-end ageing and the eventual outcome of each balanceMonth-end balances by bucket and monthly write-offs
Time to observeMust wait for outcomes, often 12 monthsUses the latest months straight away
Response to deteriorationSlow: recent periods are excluded until outcomes are knownFast: a rise in late payments shows in the next month's roll rates
Ease of explainingVery easyEasy, once the multiplication is shown
Typical usersMost companies with trade receivablesCard issuers, consumer lenders, utilities, telecom companies

The same receivables under both methods

The two methods should give similar loss rates when payment behaviour is stable. When customers start paying later, the roll rate method shows it within a month or two, as more balances roll into older buckets, while a provision matrix based on cohorts from a year ago does not yet reflect it. A company using a provision matrix therefore needs to watch for that lag and adjust, through the forward-looking adjustment or an overlay.

An example of the lag

Suppose customers start paying later and the roll rate from current to 1-30 days rises from 8% to 10% over two months, with later roll rates unchanged. The cumulative loss rate on current balances rises by a quarter, from about 0.32% to 0.40%, and the roll rate allowance rises straight away. A provision matrix built from cohorts observed a year earlier would still show the old rate until those later cohorts mature, so the company would need an adjustment to keep up.

Which ECL method should a company choose?

  • Few, larger customers on trade credit: a provision matrix, with large customers assessed individually.
  • Many small customers billed monthly: roll rates, because monthly data is available and behaviour changes quickly. Telecom, utility and subscription businesses often fit this.
  • Consumer lending and cards: roll rates for the short term, often combined with PD models for longer horizons.
  • Limited data or systems: a provision matrix, which needs only quarterly snapshots.

Can both methods be used together?

Yes, and it is often a sensible step for growing businesses. Some companies use roll rates to monitor portfolios monthly and a provision matrix for the formal allowance, or use roll rates to check whether the matrix needs an adjustment. Using both as a cross-check is good practice when the results differ, the reason should be understood.

How should the choice be documented?

A short methodology note explaining why the method suits the portfolio, the data used and its period, and how the forward-looking adjustment is made. If the method changes, for example from a provision matrix to roll rates after a systems upgrade, it is a change in estimation technique, applied prospectively, with the effect explained.

What are the pitfalls of each?

Provision matrices go wrong when write-offs are attributed to the bucket at write-off rather than the starting bucket, giving a 0% rate on current balances. Roll rates go wrong when cures and partial payments are not tracked consistently, or when balances skip buckets because of system ageing rules. See roll rate analysis, historical loss rates and provision matrix mistakes.

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Questions people ask

What is the difference between roll rates and a provision matrix?

A provision matrix traces how much of each bucket was eventually written off; roll rate analysis multiplies monthly movement rates between buckets to reach write-off.

Which method reacts faster to deterioration?

Roll rate analysis, because it uses the latest months' movements; a provision matrix waits for outcomes.

Which ECL method suits trade receivables?

Usually a provision matrix; roll rates suit businesses with many small customers billed monthly.

Can roll rates and a provision matrix be used together?

Yes, often as a cross-check, with differences investigated.

Sources

Every fee, date and rule on this page was taken from these official and primary sources.

  1. IFRS Foundation: IFRS 9 Financial Instruments

Rules and fees change. If you are reading this long after October 4, 2026, confirm the figures with the source before you rely on them.

ECLRoll rate analysis for ECLECLCalculating historical loss ratesECLProvision matrix mistakes auditors find

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This guide is general information. It is not tax or legal advice for your situation.