Whether you are selling a package of unpaid accounts or thinking of buying one, the central question is the same: what is the portfolio worth? Valuing a debt portfolio is part science, part judgement. Here are the methods professional buyers actually use.
Start with the data tape
Every serious valuation begins with a data tape — a spreadsheet with one row per debt, showing the balance, the debtor type, the age of the debt, the arrears history, the documentation available and any judgment. Without good data, a buyer cannot price the book and will either walk away or apply a punitive discount to cover the uncertainty.
Method 1: expected recovery modelling
The core method. For each debt (or each segment of similar debts) the buyer estimates:
- The probability of recovering anything, driven by the debtor's solvency.
- The expected recovery rate — how much of the balance is realistically collectable.
- The time to recovery and the cost of collecting it.
These projected net cash flows are then discounted to a present value. The sum across the portfolio, minus a margin for risk and profit, becomes the price.
Method 2: segmentation and pricing curves
Large books are broken into segments — by debt age, size, debtor type or judgment status — and each segment is priced against historic recovery data for similar debts. Fresh, documented debts against solvent companies sit at the top of the curve; old, undocumented debts against dissolved companies sit at the bottom.
A common rule of thumb: recent, well-documented portfolios trade at 20–40 pence in the pound; aged or fragmented books at single digits. But every book is priced on its own data.
Method 3: comparable transactions
Experienced buyers also benchmark against what similar portfolios have recently sold for. This sense-checks the modelled price against the real market and stops a buyer overpaying or a seller underselling.
The factors that move the price most
- Debtor solvency — the single biggest driver.
- Documentation quality — enforceable debts are worth multiples of undocumented ones.
- Age and limitation — how much runway remains before debts are statute-barred.
- Judgment status — debts with CCJs command a premium.
- Concentration — a book dominated by one large debtor carries extra risk.
➜ List your portfolio for sale
How sellers can maximise the valuation
Clean your data, gather the documentation, flag the debts with judgments, and remove or segment out the statute-barred rubbish that drags the average down. A tidy, well-evidenced book gives buyers confidence — and confident buyers pay more.
Conclusion
Valuing a debt portfolio comes down to estimating realistic net recoveries and discounting them for risk, cost and time. Sellers who present clean data and strong documentation consistently achieve better prices. If you are preparing a book, invest the effort in the data tape first — it pays for itself in the offers you receive.
