- Manish Jain
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Customers are taking longer to pay. PwC’s Working Capital Study 25/26 analyzed more than 17,000 listed companies. It put global days sales outstanding at 50.0 days in 2024, up from 47.3 days in 2015. In North America, DSO rose 5.5% over the same decade. Every extra day ties up cash that finance leaders would rather put to work.
The usual fix is to push harder on collections. Yet in B2B, you often want to keep the customer who pays late. This guide shows how to reduce DSO by fixing what actually delays payment: disputes, missing information, and inconsistent follow-up. It draws on the B2B collections program our team runs for a North American logistics company.
What DSO Measures, and What It Hides
DSO estimates how many days, on average, it takes to turn a sale into cash. The common formula divides accounts receivable by revenue for the period. It then multiplies the result by the days in that period. For example, $19.7 million in receivables on $120 million of annual revenue gives a DSO of about 60 days.
Small gains matter at that scale. In the same example, cutting 10 days could release about $3.3 million in working capital, if annual revenue stays the same. The actual cash impact depends on your receivables mix, payment terms, billing patterns, and how you achieve the reduction.
Treat DSO as a diagnostic, not a verdict. Seasonal revenue, changes in sales volume, and agreed payment terms all move it, even when collections performance stays the same. Moreover, it blends three different things: your payment terms, invoices blocked by disputes, and genuinely late payers. So split it into those parts before you change anything.
A Three-Part DSO Diagnostic
Each part of DSO has its own cause and its own fix. Work through them in order, because the first two often explain more than collections effort does.
| Part of DSO | Question to ask | What to measure |
|---|---|---|
| 1. Payment terms | Has DSO risen because the business agreed to longer terms? | Current terms against the historical customer and portfolio mix |
| 2. Disputed or blocked invoices | Are customers unable to pay because of a billing error, missing PO, or approval issue? | Disputed balances and time from dispute creation to resolution |
| 3. Overdue invoices with no dispute | Is follow-up inconsistent, reaching the wrong contact, or failing to secure payment dates? | Contact coverage, promise-to-pay kept rate, and overdue balance by aging bucket |
These three parts will not explain every movement in DSO. Still, they give you a repeatable starting point. Next, compare DSO with best possible DSO, which assumes customers pay on agreed terms. The gap shows how far collections lag behind those terms.
Where B2B DSO Really Comes From
Many late B2B payments are not refusals to pay. Instead, they are invoices stuck somewhere in the customer’s accounts payable process. The table shows the usual causes and the fix for each.
| Cause | How it shows up | Fix |
|---|---|---|
| Invoice errors and disputes | Wrong rate, quantity, or charge; payment held until corrected | Log disputes separately and fix the billing root cause |
| Missing purchase order or remittance details | Invoice cannot be matched or approved | Confirm PO and billing requirements at onboarding |
| No consistent follow-up | Contact happens only when someone has time | A fixed cadence for every account, not just the largest |
| Wrong contact | Reminders reach someone who cannot approve payment | Keep accounts payable and approver contacts current |
| Terms drift | Longer terms granted informally by sales | Approve term changes through finance |
| Collections start too late | First contact after the due date | Confirm receipt and approval before the invoice is due |
Notice that most of these are process problems, not customer behavior. As a result, fixing them can lower DSO with far fewer tough conversations.
A Follow-Up Cadence That Protects the Relationship
Consistency matters more than pressure. In the logistics collections program our team supports, the program runs a standardized seven-day follow-up framework. A fixed rhythm like this means no account goes quiet, and no customer gets five calls in a week. The cadence below is a structure we recommend; adjust the timing to your terms and customer base.
| Timing | Action | Purpose |
|---|---|---|
| Before the due date | Confirm the invoice was received, matched, and approved | Catch problems while there is still time |
| Due date | Courtesy reminder to accounts payable | Keep the invoice in the payment run |
| 7 days past due | Follow-up call; ask for a payment date | Get a specific commitment |
| 14 days past due | Check for disputes; reach the approver if needed | Separate disputes from delays |
| 30 days past due | Involve the account manager | Use the relationship, not pressure |
| 45 to 60 days past due | Agree next steps with sales and credit | Decide on holds or payment plans together |
Resolve Disputes First
A disputed invoice is not a late payment. Chasing it as one damages trust, because the customer is waiting on you. So route disputes to the right team, set a target time to resolve them, and keep the customer updated.
Talk to Accounts Payable, Not Just the Inbox
However, emails to a generic address often disappear. A phone call to the person who runs the payment schedule usually gets a date. Over time, those contacts become the most valuable part of your collections file.
Agree on Escalation Rules With Sales
Credit holds and stop-ship decisions also affect revenue, so make them together. Write down who decides, at what balance or age, and how the customer will hear about it. That way, nothing surprises anyone, including the customer.
Why Disputes Are the Fastest Lever
In many B2B portfolios, disputes drive a large share of overdue balances. Each one needs research, a correction, and often a new invoice before payment can move. Therefore, tag every dispute with a root cause, such as pricing, quantity, or missing documents.
Then look at the pattern each month. Suppose one rate table creates most disputes. Fixing it upstream then lowers DSO for every future invoice. In the logistics program, dispute management and billing clarification also sit inside the collections scope.
Compliance and Documentation in B2B Collections
B2B collections face fewer federal rules than consumer collections, but not none. The Fair Debt Collection Practices Act covers debts arising primarily for personal, family, or household purposes. So it generally does not cover ordinary business-to-business invoices.
However, state laws can also affect commercial debt collection. For example, California’s SB 1286 expanded the state’s Rosenthal Act to specified commercial debts owed by natural persons. These include certain qualifying commercial credit transactions and personal guarantees. It does not cover every business debt. Its scope depends on the transaction and the parties involved. So confirm the requirements with legal counsel before designing collection procedures.
Documentation matters just as much. Record every contact, promise, and dispute in your receivables system, so audits and handoffs are simple. The logistics program, for example, works entirely inside the client’s secure virtual environment. It also uses standardized documentation and quality scorecards.
Metrics Beyond DSO
DSO tells you that something changed, not what. Track these alongside it. Our guide to debt collection KPIs covers more measures in detail.
| Metric | What it shows |
|---|---|
| Best possible DSO | A benchmark for DSO if customers paid on their agreed terms; the result depends on the calculation method used |
| Average days delinquent | DSO minus best possible DSO, in days: how far collection performance lags behind payment terms, and an indication of room to improve |
| Collection effectiveness index | Share of collectible receivables actually collected in the period |
| Disputed balance and dispute cycle time | How much cash disputes hold up, and for how long |
| Promise-to-pay kept rate | Whether commitments from calls turn into cash |
| Balance over 60 days | Aging risk and likely write-offs |
Should You Outsource B2B Collections Follow-Up?
The work behind a lower DSO is steady and repetitive: calls, follow-ups, dispute tracking, and documentation. When internal finance staff do it, strategic work waits. So many companies keep credit decisions in-house. They hand the follow-up to a dedicated first-party collections team that works in their name.
That is the model in the logistics program. A dedicated team of six to nine people in Jamaica scales with volume. It handles follow-up, disputes, and billing clarification inside the client’s own systems. The program released about 80% of internal stakeholder capacity, and the client renewed for multiple years. Explore our B2B collections support to see how the model works.
Is follow-up slowing your cash flow?
Tell us about your receivables volume, customer mix, and current follow-up process. Our team will talk through where dedicated B2B collections support could fit.
Conclusion
You can reduce DSO without damaging customer relationships, because many late B2B payments are process failures, not refusals. So split DSO into its parts and resolve disputes first. Then follow up on a steady cadence before and after the due date. Then track the metrics that show where cash is stuck. To compare in-house and agency models, see our guide to first-party vs. third-party collections.
Frequently Asked Questions
How do you calculate DSO?
Divide accounts receivable by revenue for the period, then multiply by the number of days in the period. For example, $19.7 million in receivables on $120 million of annual revenue gives a DSO of about 60 days.
What is a good DSO for a B2B company?
It depends on your payment terms and industry. Compare DSO with your best possible DSO. The gap, in days, indicates how much room you have to improve.
How can I reduce DSO without hurting customer relationships?
Fix billing errors and disputes at the source, and confirm invoices before they are due. Then follow a consistent, courteous cadence. Involve account managers before taking firmer steps.
Does the FDCPA apply to B2B collections?
Generally no. The FDCPA covers debts incurred primarily for personal, family, or household purposes. Some states, such as California, now protect specified commercial debts owed by natural persons. So check with counsel.
Should B2B collections be outsourced?
Many companies keep credit decisions in-house. They outsource follow-up, dispute tracking, and documentation to a dedicated team working in their name and systems.
