How to reduce DSO? Start with your unapplied payments

It’s month-end at a multi-branch B2B distributor. The finance department pulls the accounts receivable aging report, and the verdict is in: DSO has climbed again. Collections are being scheduled, and pressure is being put on the recovery process.

Yet, some of these "overdue" invoices have already been paid. The money is sitting in a suspense account, unapplied, because no one has determined which invoices it belongs to yet.

“The median DSO is 46 days according to the Hackett Group, while top performers maintain it at 28 days.” Source: Billtrust, 2026 Accounts Receivable Benchmark Report, September 2026

Why is it so difficult to reduce DSO?

Because most teams focus on collections when the bottleneck is often upstream, in cash application. Chasing a client who has already paid doesn’t speed anything up. It irritates the client and wastes the team’s time.

DSO (days sales outstanding) measures the number of days between invoicing and applied payment. As long as a payment isn’t matched to the correct invoices, it remains “receivable” in the system’s eyes, even if the money is in the bank.

The Billtrust 2026 report confirms it: the average DSO for its clients is 39 days, down 5 days year-over-year. Organizations that are making progress combine electronic invoicing, automated cash application, and AI-assisted matching.

What is an unapplied payment, and why does it inflate your DSO?

An unapplied payment is a received sum that the team hasn’t yet linked to specific invoices. A wire transfer covers 40 invoices. A remittance advice arrives by email, separate from the payment. A client deducts a credit note without mentioning it.

Each case forces a manual investigation. Meanwhile, the invoice appears unpaid, the aging report worsens, and the collections team chases clients who are actually in good standing.

In the mandates PlanAxion carries out for multi-branch B2B distributors, bulk payments and incomplete remittance advices are the primary source of unapplied payments. It is a data problem before it is a payment discipline problem.

How does automating cash application reduce DSO?

By matching every payment to the correct invoices as soon as it is received, which frees up the collections team to focus on accounts that pose a real risk. The principle: capture remittance advices at the source, match partial or bulk payments, post to the general ledger, and only send exceptions to a human.

According to HighRadius (2026), manual cash application still consumes 25% of finance team resources. The same publisher reports automated matching rates exceeding 95% and a reduction of up to 80% in manual reconciliation work. These are vendor figures, not a guaranteed average: every ERP environment and payment mix yields different results.

This follows the same logic described in our analysis of accounts receivable automation via agentic AI, applied here to a specific indicator: DSO. The cash application solutions that PlanAxion implements target this area first.

A few benchmarks to help you gauge your team’s performance in 2026:

• Median DSO: 46 days, according to the Hackett Group, cited by Billtrust (2026)
• Top performer DSO: 28 days (Hackett Group, cited by Billtrust, 2026)
• Average DSO for Billtrust clients: 39 days, down 5 days year-over-year (Billtrust, 2026)
• Target cash application match rate: 85% to 95% (Billtrust, 2026)
• Financial resources still dedicated to manual cash application: 25% (HighRadius, 2026)
• Accounts receivable teams using AI that report faster payments: 99% (Wakefield Research, cited by Billtrust, 2026)

Methodological note: These benchmarks are sourced from vendor and analyst reports published in 2026. They represent market averages, not a guarantee of results for any specific organization.

Collecting the money is the easy part. Knowing exactly which invoices it covers is what ties up your cash flow.

Where do Canadian companies stand on AI adoption in finance?

Quebec is moving forward, but slowly: 12.7% of businesses were using AI for production purposes in the second quarter of 2025, according to the Institut de la statistique du Québec. Ontario shows a comparable rate (13.3%) but is progressing faster: a 7.8-point gain over one year, compared to 3.3 in Quebec.

Finance and insurance are among the most advanced sectors, with usage rates between 36.9% and 55.0%. If you lead a finance function, your peers have already started. The full picture can be found in our analysis of AI adoption in Canadian business.

Where should you start to reduce your DSO?

With a diagnostic of your unapplied payments, not with software. Measure three things: the month-end unapplied payment balance, the average time between payment receipt and application, and the percentage of collection notices sent to customers who have already paid.

These three numbers are enough to set priorities. That is the approach of our AI quick-win solutions workshop: start with operational friction, validate the data, and then deliver an initial measurable use case. The investment varies based on scope and is confirmed during a brief discovery call.

Frequently asked questions about DSO and unapplied payments

What is DSO in accounts receivable?

DSO (days sales outstanding) measures the average number of days between issuing an invoice and applying the payment. It reflects both customer payment speed and internal processing speed. A payment that has been received but not applied continues to inflate your DSO.

What is a good DSO in 2026?

According to the Hackett Group, cited by Billtrust in 2026, the median DSO is 46 days, with top performers reaching 28 days. However, a good DSO depends on your payment terms and your industry: aim for a downward trend rather than an absolute number.

What is an unapplied payment?

An unapplied payment is money received in the bank that has not yet been linked to the invoices it settles. Bulk payments, separate remittance advices, and undocumented deductions are common causes. As long as it remains unapplied, the payment skews your aging report and triggers unnecessary collection efforts.

How does AI help reduce DSO?

AI reads remittance advices, matches partial or bulk payments to the correct invoices, and only flags exceptions for human review. Vendors report match rates exceeding 95%. These are vendor figures that should be validated against your ERP environment and payment mix.