Risk-based pricing: the interest rate as a decision, not a fixed table

What is risk-based pricing?

The idea is straightforward: the rate on each transaction should cover the cost of funding, the operating cost, and the expected loss for that profile — plus margin. Since expected loss varies by applicant (probability of default) and by transaction (amount, term, collateral), the correct rate varies too.

In practice you do not need a perfect actuarial model to get started: an honest segmentation by risk level, with differentiated rates per band, already captures most of the value — and it gets refined with evidence from your own portfolio.

Implementation: a rate matrix plus cap rules

The natural form inside the decision engine is a pricing matrix: risk band (score) on one axis, product and term on the other, and in each cell the rate or the spread. Around it, hard rules the matrix can never violate:

• Regulatory caps: maximum rates by product and jurisdiction, written as an explicit and inviolable rule.
• Profitability floors: no cell may fall below total cost.
• Commercial coherence: reasonable rate steps between adjacent bands, with no jumps the customer would perceive as arbitrary.
• Governed exceptions: campaigns or partner agreements are policy versions, not manual changes made outside the engine.

Test the price the way you test a policy

Pricing has a second dimension that pure risk does not: elasticity. A higher rate improves margin per transaction but lowers conversion — and the optimal point cannot be deduced, it has to be measured.

Champion/challenger applies here just as it does in origination: a share of the traffic receives the candidate rate matrix, and you compare conversion, the resulting risk mix, and total margin before adopting the change. Every variant stays versioned and every offer stays recorded, which makes the after-the-fact analysis straightforward.

Traceability of the price offered

In pricing, traceability is not only internal audit: it is your defense against the complaint ("why was I charged more?") and against the regulator asking about price discrimination. The correct answer exists only if every offer was recorded with its transaction: the profile evaluated, the band assigned, the matrix version in force, and the caps applied.

With that, the rate difference between two customers is explained by objective, documented risk variables — which is exactly what risk-based pricing has to be able to demonstrate.

The practices described here must be adapted to the regulation, the credit policies, and the consumer protection and personal data obligations that apply in each country.