How to reduce DSO (Days Sales Outstanding): 7 practical tactics

Days Sales Outstanding (DSO) measures the average number of days it takes to collect payment after a sale. A lower DSO means healthier cash flow. Here are seven tactics that reliably bring it down.

1. Chase consistently — and automatically

Inconsistent follow-up is the single biggest driver of high DSO. Automated reminder sequences ensure every overdue invoice is chased on schedule, every time.

2. Start before the due date

A friendly pre-due reminder sets the expectation and catches problems early. Don't wait until an invoice is already late to make first contact.

3. Make paying effortless

Every extra step costs you days. A self-service portal where customers pay or promise a date in one click removes friction and accelerates payment.

4. Track promises to pay

When a customer commits to a date, log it and follow up the moment it passes. Tracked promises convert far better than forgotten ones.

5. Surface disputes early

Disputes hide as silent non-payment and quietly inflate DSO. Give customers an easy way to flag issues so you can resolve them fast.

6. Prioritise by risk and value

Focus effort on the largest and oldest balances first. A collections board that sorts by ageing and value keeps your team on the invoices that matter.

7. Measure and review

Track DSO, ageing, and collection activity weekly. What gets measured gets managed — and the trend tells you whether your process is working.

Automating the whole thing

Prime Accountax brings these tactics together for QuickBooks Online and Xero: automatic sync, reminder sequences, a self-service portal, promise and dispute tracking, and DSO reporting — so your DSO falls without adding manual work.