The short answer
Five people can realistically own invoice follow-up in a small agency: you, your bookkeeper, a virtual assistant, an in-house hire, or a fractional payment operations person. They are not interchangeable. The job has two halves, sending the messages and working out who inside the client can release the money, and most of the options only do the first half.
Owner | How it is priced | Sends reminders | Diagnoses and escalates | Works best when |
|---|---|---|---|---|
You | Your own time | Yes | Yes, badly, late | 1 or 2 late invoices a quarter |
Bookkeeper | Inside your monthly fee, or hourly | Statements only | No | You need the record to be right |
Virtual assistant | Hourly, low | Yes | No | Many small invoices, one template |
In-house hire | Salary | Yes | Yes, once trained | Roughly 30 people and up |
Fractional payment ops | Flat monthly | Yes | Yes | Few invoices, large, client relationships that matter |
Collections agency | 25–50% of what it recovers | Yes | Recovery only | The commercial relationship has already ended |
The rest of this piece is what each one costs, where it works and the point at which it stops working.
1. You, the founder
What it costs
The hours are the smaller half of the bill. An invoice at day 45 takes maybe 20 minutes of actual work across a week, and at your own billable rate that is not the number that hurts. The expensive part is that you are also the person selling the next project, and the two roles want different tones. The sales instinct usually wins, which is how a follow-up turns into an apology.
Where it works
Fine at 1 or 2 late invoices a quarter, with clients whose finance contact you already know by name. At that volume a process would be overhead.
Where it stops working
Two thresholds. The first is around 4 or 5 open threads at once, where you stop being able to hold the state in your head and start missing follow-up dates. The second arrives sooner: the moment an invoice needs somebody above your day-to-day contact. Asking a finance director for a payment date is a different conversation from asking your project contact for an update, and most founders will not make that call about a client they hope to sell to again.
2. Your bookkeeper or accountant
What they are for
The record. A good bookkeeper will give you an accurate aged receivables list on the day you ask for it, and some will send statements of account on a schedule. That is genuinely useful, and it is the input every other option on this list runs on.
What it costs
Usually inside your existing monthly fee if it is statements only. Anything past that is billed at accounting rates, which is an expensive way to buy admin.
Where it stops working
A bookkeeper works inside your accounting system. The blockers live inside the client's: an unapproved invoice, a purchase order that does not match, a supplier record that was never completed. Those are covered in the 7 reasons invoices stall, and none of them are visible from your side of the ledger. Bookkeepers are also, correctly, not client-facing on your behalf. Asking yours to negotiate a payment date puts them in a role they did not sign up for.
3. A virtual assistant
What it costs
The cheapest hourly option on the list, and the most common first move once a founder decides to stop doing this personally.
Where it works
Volume with sameness. Many small invoices, one template, no judgement required per message. If your problem is that 40 reminders need sending and nobody has sent them, a VA solves it.
Where it stops working
A VA can send the reminder. They cannot tell you whether the invoice is stuck at approval, at PO matching or at vendor setup, because that requires knowing how accounts payable functions are built. They also cannot credibly ask a finance director for a payment date on your behalf, and escalation is a judgement call about a client relationship they have never been part of.
The cost worth naming: the lowest hourly rate on the list is also the one most likely to produce a wrong message on a $15,000 invoice, and a wrong message at day 60 is expensive to undo.
4. An in-house hire
What it costs
Salary, plus the management time to train somebody in a discipline you do not practise yourself.
Where it works
Above roughly 30 people, or wherever accounts receivable is genuinely a full-time load. At that size the role pays for itself and the process stops living in one person's memory.
Where it stops working
Below that, you are buying capacity you cannot fill. A 6 to 20 person agency does not have 40 hours a week of payment operations, so the role gets padded with project admin, and within a quarter the payment work is the part that slips. It is the same failure as before, with a salary attached.
5. Fractional payment operations
What it costs
A flat monthly fee rather than an hourly rate or a percentage. Collected42 is $490 a month for up to 10 active payment threads, which is the shape most small agencies actually need. There is a fuller definition of the function in what payment operations is.
Where it works
Few invoices, large enough that timing affects payroll, going to clients big enough to have an accounts payable process of their own. You want the founder out of the payment thread and the client relationship left intact.
Where it stops working
Two places, and both matter. High-volume, low-value invoicing is better served by software, because you are paying for judgement you do not need. And a client who genuinely cannot pay is not a payment operations problem: no amount of process produces money that is not there.
The cost worth naming: you are handing a client-facing thread to somebody outside your company. That needs a real handover, an accounts@ address and agreement about what happens when a client pushes back. Anyone who tells you it is friction-free is selling.
What about a collections agency?
Different timing rather than a different flavour of the same thing. A collections agency is engaged after the commercial relationship has failed, takes 25% to 50% of what it recovers, and the client rarely comes back. Every option above exists to keep invoices out of that queue. When you do need one, the vendor comparison covers the specific providers and where each fits.
How to pick
Work down this list and stop at the first line that describes you.
Fewer than 3 late invoices a quarter, all under $5,000: keep doing it yourself, and put your follow-up dates in the calendar so they stop depending on how the week is going.
High volume, low value, one repeated message: automate it, and use a virtual assistant for the exceptions.
Your invoices are $5,000 and up, your clients have an accounts payable function, and you are the one following up: this is the case for a fractional owner.
Roughly 30 people or more, or accounts receivable is already someone's half-job: hire for it and write the process down.
The client has stopped replying, disputes the work, or has told you they cannot pay: none of the above. That is escalation, and asking for a name and a date is the first step.
Whichever line you stopped on, the follow-up messages themselves are a solved problem. The templates for each stage cover pre-due through to formal escalation, and they work the same whoever is sending them.
The question is not who sends the email. It is who is responsible for the invoice on the day nobody sends one.
FAQ
Who should chase unpaid invoices in a small agency?
Somebody other than the founder, once the volume passes about 4 open threads at a time or the invoices pass roughly $5,000. Below that the founder is the cheapest option. Above it, the founder is the most expensive one, because the role conflicts with selling the next project.
Can my bookkeeper follow up on unpaid invoices?
They can send statements of account, and many will. What they cannot do is diagnose why a specific invoice is stuck inside the client's approval or purchase order process, or negotiate a payment date on your behalf. Bookkeeping is the record of what happened; follow-up is a separate job that acts on it.
Is a virtual assistant enough to handle overdue invoices?
For many small invoices that need the same message, yes. For a small number of large invoices that need diagnosis and escalation, no. The limit is not effort or reliability, it is that the work requires knowing how accounts payable and procurement are organised inside the client.
When should an agency hire someone in-house for accounts receivable?
When the work is genuinely full-time, which for most agencies means somewhere around 30 people. Below that the role gets absorbed into project admin and the payment work is the part that gets dropped.
What is the difference between fractional payment operations and a collections agency?
Timing and intent. Fractional payment operations runs from the day the contract is signed and is designed to be invisible to the client beyond a well-organised billing process. A collections agency is engaged once that has failed, works on a percentage of what it recovers, and usually ends the commercial relationship.
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