The Silent Profit Drain

The short answer

Spend leakage is money that leaves your business without buying what you agreed to buy. It comes from duplicate payments, unagreed price rises, invoice errors, unclaimed credits and off-contract purchasing. APQC puts the median duplicate and erroneous payment rate alone at 1.5% of disbursements. Most of it is never noticed, because nobody checks every line.

What is spend leakage?

Spend leakage is the gap between what you should have paid and what you actually paid. It is not one big loss. It is hundreds of small ones, spread across suppliers, sites and months.

That is why it stays silent. A £14 duplicate here and a 6p price rise on a case of tomatoes there never trips an alarm. Across a year and a dozen suppliers, they add up to real margin.

How much does spend leakage cost a business?

The research is consistent: leakage is measured in percentage points of spend, not rounding errors.

On a £1m annual spend, a 1.5% duplicate and error rate is £15,000 gone before you count price creep or missing credits.

Where does the money actually leak?

The apexanalytix 2026 Global Overpayment Report, built on $3.25tn of spend and more than 400 million invoices, ranks the causes of lost profit. Duplicate payments lead at 18%, followed by cancelled invoices or services still being paid (14%), pricing discrepancies (13%), returned goods never credited (13%) and unclaimed rebates (10%).

For a UK multi-site operator, those causes look like this:

1. Duplicate payments. The same invoice keyed twice, or arriving once by email and again by post. Different invoice numbers for the same delivery.
2. Price creep. The supplier quietly raises a unit price. Nobody compares it to last month, so it becomes the new normal.
3. Invoice errors. Wrong quantities, wrong VAT, misread totals, items you never received.
4. Unclaimed credits. Short deliveries and returns that were promised a credit note that never arrived.
5. Off-contract buying. A site manager orders from the supplier down the road at a higher price because it is quicker. APQC’s narrower measure puts unmanaged spend at a median 1.6% of total spend.
6. Fraud. Bank details changed by a convincing email. UK Finance recorded £41.3m of invoice and mandate fraud in 2025.

Why don’t finance teams spot it?

Because manual checking samples, and leakage hides in the lines nobody samples.

Most teams check the invoice total against the purchase order, if there is one. Few check every line, every unit price and every prior invoice from that supplier. Multi-site operators make it harder: each site buys differently, and the evidence sits in delivery notes, emails and the accounts system at once.

Recovery after the fact is expensive. Recovery audit firms typically take 20-30% of what they recover, and the money has already left your account.

Key trends in spend leakage

• Fraud is shifting, not falling. UK invoice and mandate losses dipped 4% in 2025, but total APP fraud rose 19% to £576.4m. Criminals follow the weakest payment process.
• Exceptions are rising. Ardent’s average exception rate climbed from 14% in its 2025 report to 19.9% in 2026. More suppliers, more formats, more mismatches.
• Continuous monitoring is replacing the annual audit. The best performers now check every transaction before payment, not a sample after it.
• AI is arriving, slowly. Only 17% of AFP respondents use AI against payments fraud. The gap between early adopters and everyone else is widening.

How do you stop spend leakage?

1. Check every invoice line against the order and the delivery, not just the total.
2. Compare each unit price with the last price you paid that supplier.
3. Flag any invoice that matches an earlier one on supplier, amount or date.
4. Chase every short delivery until the credit note lands.
5. Verify supplier bank details independently before the first payment and after any change.
6. Route all buying through approved suppliers with agreed prices.

Doing all six by hand is unrealistic. That is the point of automation.

Where OmniPATH fits

OmniPATH reads every invoice down to the line and checks it before you pay. The Watchers, 27 autonomous agents, re-check every transaction every 30 minutes for duplicates, price rises, fraud patterns and misreads, then rank what they find by severity.

At one UK hospitality operator, OmniPATH captured £8,035 of value on £88,681 of spend across eighteen months of invoices: 9.1% of spend. Leak-type findings alone came to 5.9%.

Related reading

• AP automation
• The credit note crisis: The hidden cost of unclaimed credits
• Clean-Billing: The secret to ending the credit note headache for good

FAQ

What is spend leakage in procurement?

Spend leakage is money paid out that doesn’t buy what was agreed. It includes duplicate payments, unagreed price rises, invoice errors, unclaimed credits, off-contract purchasing and payment fraud. It usually goes unnoticed because each loss is small and spread across many suppliers.

How common are duplicate invoice payments?

APQC benchmarking puts the median organisation at 1.5% of disbursements paid in duplicate or in error, with top performers at 0.8%. Duplicates are the single largest cause of overpayment in the apexanalytix 2026 Global Overpayment Report, at 18% of lost profit.

What is price creep?

Price creep is a gradual, unannounced rise in the unit price a supplier charges. It is rarely flagged because the invoice total still looks normal. The only reliable defence is comparing every line price against the last price paid.

How much invoice fraud is there in the UK?

UK Finance recorded £41.3m lost to invoice and mandate fraud in 2025 across 2,305 cases, with 68% of losses on business accounts. Total authorised push payment fraud rose 19% to £576.4m.

Can spend leakage be recovered after payment?

Some can, through recovery audits, but firms typically charge 20-30% of what they recover, and suppliers may dispute old claims. Catching leakage before payment is cheaper and keeps the money in your account.

How does AP automation reduce spend leakage?

AP automation checks every invoice line against orders, deliveries and price history before payment. It flags duplicates, price rises and bank detail changes automatically, so nothing depends on someone happening to notice.

Sources

• APQC – duplicate disbursements benchmark (figures via Corpay)
• apexanalytix – 2026 Global Overpayment Report
• Ardent Partners AP Metrics That Matter 2026, via Medius
• Ardent Partners 2025 AP metrics, via apexanalytix
• Ardent Partners Procurement Metrics 2025, via Zycus
• APQC – unmanaged/maverick spend
• UK Finance Annual Fraud Report 2026
• AFP 2026 Payments Fraud and Control Survey
• apexanalytix – recovery audit cost