Fee earners at UK law firms spend 30–40% of their time on administration. That's not a guess — it's a consistent finding across surveys of small and mid-size legal practices. Chasing invoices is one of the biggest chunks of that admin time. And unlike billable work, chasing invoices generates no revenue — it just recovers revenue that's already been earned.
One Birmingham commercial law firm decided to hand the entire invoice chasing process over to an AI agent. In the first 30 days, it recovered £6,400 in overdue invoices that had been sitting unpaid — some for months. Partners hadn't needed to make a single phone call.
This article explains what automated invoice chasing looks like for a law firm, what it costs, and how to get started without disrupting your existing client relationships.
The Solicitors Regulation Authority doesn't set rules on when you should be paid — but the reality is that many law firms wait 60, 90, or even 120 days for invoices to be settled. For a small firm running on tight margins, that gap between billing and payment puts real pressure on cashflow.
The problem is rarely that clients refuse to pay. It's usually far more mundane: the invoice arrived in a busy inbox and slipped down the list. The matter closed and the client moved on, assuming the bill would come eventually. Or the accounts team at the client's end is waiting for an authorisation that nobody has chased.
A polite, timely reminder — sent at the right moment — is usually all it takes. The trouble is that sending those reminders consistently, across every matter, for every client, without forgetting anyone, is exactly the kind of task that nobody at a law firm has time to do properly.
So invoices sit. Partners feel awkward chasing clients they want to retain. Cashflow suffers. And the money that should have arrived in week four doesn't show up until week fourteen, if it shows up at all.
An AI invoice chaser doesn't replace your billing process — it automates the follow-up sequence that happens after the invoice is sent. Once you've billed the client, the AI takes over from there.
A typical sequence for a law firm looks like this:
Every message goes out on schedule. No invoice is forgotten. No client gets two reminders because someone on the team didn't check whether it had already been sent. And the partners only get involved when a human decision is genuinely needed.
The most common concern we hear from law firms is about client relationships. "We can't risk annoying a client who sends us good repeat business."
It's a fair concern, and it's one the AI handles well — because the messages it sends are the messages you approve before anything goes live. You control the tone, the wording, the escalation timing, and which matters are included in the sequence. If you have a longstanding client you want to handle manually, they're excluded. If you want a softer tone for consumer clients than for commercial ones, you configure that.
The feedback from firms that have implemented this is consistent: most clients don't notice any difference in how they're being treated. They receive professional, timely messages that look exactly like they came from your firm — because they did. What they don't see is that no human typed them.
What firms notice is that the awkward, draining experience of chasing clients for money — which partners often put off because it feels uncomfortable — simply stops being their problem.
We'll show you how automated invoice chasing would work for your firm, including how it integrates with your existing billing system.
Book Free Call →Invoice chasing is just one of the admin tasks eating into fee earner time. UK law firms consistently report that administrative work — billing queries, client onboarding, file management, compliance administration — accounts for between 30% and 40% of working hours that could otherwise be billed.
An AI agent doesn't just chase invoices. Depending on the plan, it can also:
The firms getting the most out of this aren't thinking of it as "invoice chasing software". They're thinking of it as a member of the support team who works 24 hours a day and never puts anything in a pile to deal with later.
Law firms often assume this kind of automation is expensive — a bespoke integration project that costs more than the invoices it recovers. That's not how this works.
All three Inference Agents plans include invoice chasing as a deployable agent, with no setup fees and no long-term contracts.
For the Birmingham firm in the case study, the £6,400 recovered in month one represented more than 16 times the cost of the subscription. Even in quieter months, the value of the time returned to fee earners — time they can put back into billable work — typically exceeds the subscription cost many times over.
We connect the AI to your billing system or work from exported invoice data. We configure the message sequences with you — wording, timing, escalation rules, which clients or matter types to include or exclude. You sign off every template before it goes live.
The AI begins working through your outstanding invoices. In most firms, a significant portion of overdue invoices are settled within the first two weeks, simply because they've now received a clear, professional reminder for the first time. Clients who have queries respond to the AI's email address; those replies come through to a shared inbox you monitor.
Your professional services AI dashboard shows collection rates, outstanding amounts by age, and which matters have been flagged for manual review. Partners get a weekly summary email if they want one, or they can log in and check at any time. The system runs quietly in the background; you only need to intervene when a human decision is needed.
Two practical questions come up regularly when we talk to law firms. Here's the straightforward answer on both.
SRA rules: Automated invoice chasing is administrative communication, not legal advice. Provided the messages are accurate, clearly identify your firm, and don't misrepresent the legal position, they're entirely consistent with SRA requirements. We review your templates with you to ensure they meet your obligations. We also provide a Data Processing Agreement as standard for GDPR compliance.
Client care: Your client care letter or terms of engagement should already describe how billing works and what happens if invoices aren't paid. If your terms include a late payment clause (even just statutory interest under the Late Payment of Commercial Debts Act), your AI reminders can reference this — it's often the nudge commercial clients need to process the payment promptly.
If you have a specific compliance question about your firm's situation, bring it to the free call and we'll work through it with you before you commit to anything.
Book a free 30-minute call and we'll show you exactly how automated invoice chasing would work for your firm — including a realistic estimate of what you could recover in the first month.
Book Free Call →