Unpaid Invoice Collection: Real Follow-Up Until You Get Paid
Over half of small businesses are owed money on overdue invoices right now, $17,500 on average. Sanso handles the follow-up for you, from first reminder through dispute resolution, so you actually get paid without spending your week on it.
I'm Amalia Bercot, Co-Founder of Sanso. I spent years working with SMBs at Brevo, and I kept hearing the same thing: "I did the work, I sent the invoice, and now I'm the one chasing." We built Sanso because that shouldn't be your job.
The Problem With Unpaid Invoice Collection
Late invoices don't just cost you money. They eat your time, mess with your cash flow, and sit in the back of your mind while you're trying to focus on everything else.
You know the pattern. Invoice goes out, due date passes, silence. You send a reminder. Then another. Maybe a phone call. The client promises next week. Next week comes and goes. At some point you're spending more energy collecting than you spent on the work itself.
The data is rough: 30% of outstanding invoices need three or more follow-ups before anyone pays. After 90 days overdue, your odds of collecting drop by 60%. The longer you wait, the less likely you are to see that money.
And most small businesses don't have an accounts receivable person. It's the CEO, or the office manager, or whoever has five free minutes between other things. Reminders go out late. Disputes pile up. Invoices slip through and quietly become write-offs.
How Sanso Solves Unpaid Invoice Collection
Sanso takes over overdue invoice follow-up entirely. We're not another tool that sends automated reminder emails and hopes something sticks. There are real people doing the work, with AI handling the tracking and scheduling behind the scenes.
When an invoice goes overdue, we're on it. We track the balance, send reminders through the right channels, and escalate when we need to. If a customer comes back with a dispute, wrong amount, wrong entity, missing PO number, we sort it out. We void the bad invoice, fix whatever was wrong, reissue the corrected version, and keep following up until money lands.
All of this happens inside your existing accounting tools. Payment statuses update in QuickBooks, Xero, or Pennylane the way they always do. There's nothing new to learn or log into.
Key Capabilities
Proactive Payment Tracking
Sanso watches every invoice from the moment it goes out. We know who's paid, what's coming due, and what's late. You can see the full picture of your accounts receivable without building spreadsheets or clicking around in your accounting platform.
Multi-Channel Follow-Up
Automated dunning emails are easy to ignore, and most customers do exactly that. Sanso reaches your customers through multiple channels: email reminders plus direct outreach. We start with polite nudges before the due date, get firmer as invoices age, and pick up the phone when email isn't getting a response.
Dispute Resolution
This is where dunning tools and most collection software stop being useful. A customer replies saying "that's the wrong amount" or "you billed the wrong entity," and an automated system has no idea what to do with that. Sanso does. Our team reviews the dispute, fixes the invoice, reissues it through the customer's procurement workflow, and stays on it until the invoice is resolved and paid.
Invoice Reissuance and Correction
When a billing error is holding up payment, sitting on it makes things worse. Sanso voids the incorrect invoice, creates the corrected version, and submits it right away, instead of it sitting in someone's to-do list for a week.
Integration With Your Existing Tools
Sanso plugs into QuickBooks, Xero, or Pennylane directly. Payment updates, reissued invoices, resolved disputes: it all shows up where you already work. There's no separate platform to manage.
Who This Is For
CEOs and founders of 5-50 person businesses who are personally chasing payments or handing it off to someone who doesn't have AR experience
B2B service companies and agencies that invoice clients monthly and deal with unpredictable payment timelines
Law firms where clients regularly delay payment on retainer or project-based billing
Construction businesses with complex invoicing across multiple stakeholders and long payment cycles
Any small business that has quietly written off overdue invoices because chasing them felt like a waste of time
How It Works
Connect your tools: Link your accounting platform (QuickBooks, Xero, Pennylane) so Sanso can see your invoices and payment status. One-time setup.
Sanso monitors your receivables: We track every invoice and flag overdue balances automatically. You don't have to do anything.
Follow-up begins: When an invoice goes past due, Sanso sends reminders and escalates through multiple channels. If a customer pushes back with a dispute, we handle the back-and-forth.
You get paid: Corrected invoices go out, disputes get resolved, and payments hit your bank account. Everything is reflected in your accounting tools.
Results You Can Expect
The time you spend chasing payments drops to zero. That's the most immediate change: you stop losing hours each week to follow-up emails and awkward phone calls.
Beyond that, clients who use Sanso see faster payment cycles and fewer invoices sitting unpaid past 90 days (the point where collection odds drop off a cliff). We catch overdue invoices early and deal with disputes as soon as they come up, which keeps your Days Sales Outstanding (DSO) low and your cash position stable.
The reason this works is the combination of AI and actual people. AI does the tracking, the scheduling, the monitoring. People handle the judgment calls: the conversations, the problem-solving, the things a piece of software can't figure out on its own.
Frequently Asked Questions
What is unpaid invoice collection? It's the process of following up with customers who haven't paid by the due date. That means sending reminders, escalating overdue balances, working through disputes, and recovering what's owed to you.
How does Sanso's overdue invoice follow-up work? We track every invoice you send. When a payment is late, follow-up kicks in automatically: email reminders, direct outreach, escalation over time. If a customer disputes the invoice, our team works through it and reissues the corrected version.
Is Sanso a debt collection agency? No. Sanso is a finance operations service. We handle the professional follow-up and dispute resolution that happens while invoices are still recent, the work that comes before a collections agency would ever get involved.
What accounting platforms does Sanso work with? QuickBooks, Xero, and Pennylane. Everything we do shows up in your existing tools. No new platform to learn.
How is Sanso different from dunning software? Dunning tools send automated email sequences. When a customer writes back with a question or dispute, those tools have no way to respond. Sanso handles the full cycle: dispute resolution, invoice correction, reissuance, until payment actually arrives.
How much does unpaid invoice collection cost with Sanso? Pricing is outcome-based, tied to things like invoices issued and payments recovered. Monthly plans run from $300 to $2,000 depending on volume. No per-seat fees, no feature gates.
How quickly can Sanso start collecting my overdue invoices? Once you connect your accounting platform (one-time setup), monitoring starts right away. We flag overdue invoices and begin follow-up from day one.
Will my customers know I'm using Sanso? Not unless you want them to. We work behind the scenes, and all communications with your customers are professional and consistent with how your business normally operates.
What happens if a customer disputes an invoice? Our team looks at the dispute, figures out what needs to change (amount, entity, PO reference), voids the original, reissues the corrected invoice, and follows up until payment comes through.
Can I still handle some collections myself? Yes. You can hand off everything, or point us at specific clients or invoice types that eat up the most time. It's flexible.
Get Started
If unpaid invoices are piling up, or you've been quietly writing them off, let us take that off your plate. Book a call and we'll show you how Sanso handles collections for businesses like yours. Setup is quick, and follow-up starts the same day.
