The formula
Cash freed = Revenue ÷ 365 × (DSO_current − DSO_target); Saving = Cash freed × Rate%
Revenue divided by 365 is your average daily sales — the amount each day of DSO traps in receivables. The release is one-off but permanent: cash arrives once as collections accelerate, then stays out of receivables for as long as the improved DSO holds, which is why the financing saving recurs annually.
The financing rate should be your marginal cost of funds if borrowing supports working capital, or the return cash earns in its next use if not. Businesses financing imports at 1.5% per month are effectively paying that rate on every day of customer lateness — a transfer from your margin to their treasury.
How to use this calculator
- 1
Measure real DSO
Receivables balance ÷ annual revenue × 365, from the balance sheet — not the payment terms you print on invoices, which are aspiration.
- 2
Set a defensible target
Your contractual terms plus a realistic collection lag. Terms of net-30 with a 55-day DSO means 25 days of leakage to attack.
- 3
Price the improvement
The calculator converts recovered days into cash and annual financing saving — the budget for fixing collections.
- 4
Attack the leakage in order
Invoice speed and accuracy first, then payment friction, then chasing discipline, then terms enforcement. Most DSO leakage is process, not customer malice.
Where DSO days actually hide
DSO decomposes into fixable stages: invoicing lag (days between delivery and invoice — often 3–7 entirely self-inflicted days), invoice errors that restart customer approval clocks, payment friction (customers who would pay today but face a clumsy payment path), and genuine late payers. Most businesses find a third of their excess DSO in the first two stages — inside their own building, free to fix.
Cross-border receivables add corridor friction: an international customer’s payment spends days in transit that domestic collections never see, and unclear beneficiary details or missing references park inbound funds in review queues. Collection infrastructure — local receiving accounts, correct currency invoicing, clean payment instructions on every invoice — removes days that no amount of chasing can.
The instruments beyond discipline
When process is fixed and customers still pay slowly, the remaining tools price the delay explicitly: early-payment discounts convert your cost of funds into a customer incentive (the Early Payment Discount Calculator prices both sides of that trade), receivables financing converts invoices to cash at a fee, and terms renegotiation reprices the credit you extend. Each costs something; the calculator’s output tells you what solving the problem is worth, which is the budget.
The symmetric lever is DPO — paying your own suppliers no earlier than terms require — and the combined view is the cash conversion cycle, which the Working Capital Calculator computes. A business that shortens DSO by ten days while holding DPO steady removes ten days from its cycle; both ends of the pipeline are negotiable.
Common use cases
Collections business case
Price what a collections hire, tool or process fix must achieve to pay for itself.
Working capital planning
Model DSO scenarios in cash terms for budgets and lender conversations.
Discount policy design
Compare the cost of early-payment incentives against the financing saved.
Cross-border collections review
Quantify the corridor-friction days in international receivables.
Automate this with the API
Check indicative collection-side corridor pricing for international receivables.
curl "https://keybs.io/api/v1/tools/corridor-pricing?corridor=nigeria-china" \ -H "x-api-key: YOUR_FREE_KEY"Free Tools API docs and key registration
Frequently asked questions
Is the cash release one-off or recurring?
The release is one-off but permanent: as collections accelerate, cash arrives once and receivables stay lower for as long as the improved DSO holds. The financing saving on that released cash recurs every year. Backsliding reverses it just as quickly — DSO improvements need maintenance, not just achievement.
My payment terms are 30 days but DSO is 55 — where do the extra days come from?
Four places, in typical order of size: your own invoicing lag, invoice errors that restart the customer’s clock, payment friction on the customer’s path to paying you, and genuine late payment. Audit ten recent invoices end-to-end and the split becomes obvious — most businesses find self-inflicted days first.
What is a good DSO?
Relative to your terms, not an absolute: contractual days plus 7–10 of realistic lag is healthy for B2B. Net-30 terms landing 38-day DSO is strong; 55 is a project. Industry and geography move the baseline — cross-border B2B runs structurally higher than domestic — so benchmark the gap to terms, not the raw number.
Do early-payment discounts pay for themselves?
When the annualised cost of the discount is below your cost of funds plus the risk reduction of earlier cash, yes. Offering 2/10 net 30 costs you ~37% annualised on accelerated invoices — expensive money unless your financing is dearer or the receivable risk is real. Run both calculators; the answer is specific to your rates.
How does invoicing currency affect collection speed?
Invoicing in the customer’s currency removes their FX friction and excuse — they pay a local-feeling invoice — while moving conversion to your side, where it is priceable and manageable. Combined with local receiving capability, it can remove several corridor days. Price the FX cost against the DSO days recovered; the trade is often favourable.
Can KeyBS Pay shorten my international DSO?
The collections side, yes: Global Collections capability lets international customers pay through local-feeling routes, funds land in multi-currency accounts without forced conversion, and clean payment references reduce review-queue delays. Corridor availability varies by market — the country pages on this site document collection options per corridor.
Corridors, tools and reading for this calculator
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