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In depth · Payer psychology · Cash flow for small businesses and SMEs

Your clients aren’t bad payers. They’re human.

Distracted, overloaded, waiting for a green light, or simply never reminded. Understanding why an invoice is stuck tells you how to unstick it: the right message, to the right person, at the right time. And every day gained goes back into your cash.


An unpaid invoice is rarely a refusal. Most often, it’s a decision that hasn’t been made yet.

It’s tempting to picture the late payer as a cynical calculator. Reality is more ordinary, and more encouraging: most delays come from forgetting, an approval process, an absent contact, or an awkwardness nobody dares to mention.

Behavioural science explains it well: we act on what is visible, simple and expected of us. An invoice buried in an inbox is neither visible, simple nor urgent. It waits.

So a reminder isn’t “harassment”. It makes the invoice stand out, removes friction, reaches the person who can actually pay, and calmly recalls the rules when courtesy is not enough.

You still need to know who you’re talking to. The same message, sent to every client at the same time, misses half its targets. That’s what this page is about.

The profiles

Six ways not to pay, six ways to respond.

Behind every delay there is a line of reasoning, often unconscious. Identifying the profile means choosing the right contact, the right moment, the right tone and the right channel.

Profile 01 · Salience

The forgetful one

“Oh yes, that invoice… I’ll deal with it as soon as I have two minutes.”

They have nothing against you. Your invoice has simply sunk below forty other emails. What isn’t visible doesn’t exist.

The right response
WhoThe person who received the invoice
WhenBefore the due date (D-3), then the day after (D+1)
ToneFriendly, brief, factual
ChannelEmail with the invoice attached and a clear subject line
Profile 02 · Friction

The overloaded one

“It needs entering, approving, finding the bank details… Later.”

They want to pay, but every step takes effort. The longer the path, the more the payment slips to next week.

The right response
WhoAccounts payable
WhenJust before their usual payment day
ToneHelpful: you make their job easier
ChannelShort email, payment link, bank details and invoice attached
Profile 03 · Loss aversion

The cash strategist

“This supplier never chases. They can wait another month.”

They pay last those who speak up least. Your silence is a free line of credit for them.

The right response
WhoThe finance manager or the owner
WhenFrom D+1, then with no gaps in the schedule
TonePolite and firm: late payment interest and fixed compensation worked out
ChannelEmail, then a formal notice at D+30
Profile 04 · The right decision-maker

The one waiting for a trigger

“Without a purchase order approved by procurement, I can’t release payment.”

The blockage isn’t with them, but one level up or next door. Chasing the wrong person only goes round in circles.

The right response
WhoThe approver: buyer, project manager, management
WhenAs soon as the invoice is issued, to check nothing is missing
TonePractical, with a precise question: what’s missing?
ChannelEmail to the approver, accounts in copy
Profile 05 · Commitment

The embarrassed one, or in difficulty

“I don’t have the cash this month. I’d rather not reply.”

Silence protects from discomfort. The longer it lasts, the harder it is to break. A small written commitment is worth more than a big verbal promise.

The right response
WhoThe owner
WhenEarly, before silence sets in
ToneKind, non-judgemental, offering a payment plan
ChannelPersonal email, then a written, dated agreement
Profile 06 · Reciprocity

The silent disputer

“The delivery wasn’t complete. Until we talk about it, I’m not paying.”

An unspoken disagreement blocks everything. Standard reminders annoy them; an open hand finally lets them say what’s wrong.

The right response
WhoThe operational person who received the service
WhenFrom the first unusual delay for this client
ToneOpen: “Is there anything we need to sort out on our side?”
ChannelPersonal email, then a call

The levers, without jargon.

These mechanisms are described by behavioural economics. There’s nothing magic about them and they manipulate nobody: they help a legitimate message get seen, understood and acted on. Their effect varies by client, sector and relationship.

Salience

We act on what’s in front of us. A reminder at the right time, with a clear subject line, puts the invoice back on top of the pile.

Friction

Every extra step delays action. A payment link, the invoice and the bank details attached: paying becomes the easiest option.

Commitment

Someone who has said yes in writing, even to a payment plan, tends to keep their word. Ask for a small, precise agreement rather than a vague promise.

Loss aversion

A running penalty weighs more than an equivalent gain. Putting a figure on late payment interest and recovery costs makes the cost of delay concrete.

Norms and reciprocity

Recalling the agreed due date recalls the rules of the game. Thanking, offering help, listening to a disagreement: the relationship stays a two-way exchange.

Reminder stages

The tone rises, gradually.

D-3
Friendly nudge · Make it visible

A reminder before the due date, so the invoice is handled in time.

“Quick reminder: invoice F-118 is due on Friday. The payment link is below.”

D+1
Friendly observation · Make it simple

An observation without reproach, with everything needed to pay in a minute.

“Unless we’re mistaken, we haven’t received payment yet. Everything is attached.”

D+7
Direct reminder · Find the decision-maker

Address the person who approves, and ask what’s blocking.

“Is anything missing on your side to release payment for this invoice?”

D+15
Firm · Make the cost concrete

Late payment interest is worked out — and, for B2B invoices in France, the €40 fixed compensation for recovery costs set by French law.

“As of today, late payment interest under our terms amounts to €20.97 on this €4,200 invoice (12.15% a year), plus the €40 fixed compensation for recovery costs.”

D+30
Formal notice · Put it on record

A formal notice, the first step before legal proceedings.

“We hereby give you formal notice to pay €4,281.94 (€4,200 principal, €41.94 late payment interest and €40 fixed compensation) within eight days.”

Sample messages, based on French rules for B2B invoices. Every message can be edited, and you can approve each one before it’s sent.

Cash flow

When a client pays late, you’re lending them money.

Interest-free, without a contract, and often without knowing it. Three ideas are enough to see why every day counts.

Before

You deliver

The work is done, the costs are committed.

D0

You invoice

The receivable is created. The money hasn’t moved yet.

Due date

The client should pay

The agreed payment terms have passed.

Actual payment

The money arrives

Sometimes long after the due date.

Throughout this gap, your money is working for your client.

DSO

Days sales outstanding

The average number of days it takes you to collect an invoice. It’s the thermometer of your reminders.

DSO ≈ receivables ÷ monthly invoiced revenue × 30

WCR

Working capital requirement

The money your business must advance before being paid: stock and receivables, minus what you owe suppliers.

The longer clients take to pay, the bigger the requirement, and the tighter your cash.

1 day

Every day gained counts

One day less in payment terms is roughly one day of revenue coming back into your account, and staying there.

Example: €60,000 invoiced a month is about €2,000 per day of delay.


The calculator

How much cash is sitting with your clients?

Enter your own figures. The calculation runs in your browser; nothing is sent.

Cash freed, estimate
€33,333

freed once, then kept as long as your payment time stays at that level.


Days gained20 dPer day gained€1,667Receivables€91,667 → €58,333
Month-end cash
Today€20,000
After€53,333
How it’s calculated

Cash freed ≈ monthly revenue × (current payment time − target payment time) ÷ 30. This is a simple estimate that assumes steady revenue and ignores seasonality, disputed invoices and VAT. It isn’t a promise of results: it’s the order of magnitude of the money at stake.

For reference, under French law, agreed payment terms between businesses generally can’t exceed 60 days from the invoice date, or 45 days end of month if the contract says so. Other countries have their own rules.

The method

A reminder for each person, not one reminder for all.

Le Frac sends reminders for your invoices in your name, taking each client into account: the right person, the right moment, the right tone.

The right decision-maker

The reminder goes to the person who can actually release payment, not to a generic address.

The right moment

Just before the client’s usual payment day, rather than on an arbitrary date.

Zero friction

Every message includes the invoice, your bank details and a payment link. The money goes straight to your account, never through us.

Gradual, lawful firmness

For B2B invoices in France, late payment interest and the €40 fixed compensation for recovery costs are calculated automatically (art. L441-10 of the French Commercial Code).

Questions
Is this a debt collection agency?

No. Le Frac is software that sends your reminders, in your company’s name. You keep the relationship with your client, and the money goes straight to your account, never through us.

Will my clients feel harassed?

Quite the opposite: fewer messages, better targeted. A reminder sent to the right person, at the right time and with a payment link often avoids the next ones. The tone stays polite, then firm, always within the law.

What if my client is genuinely in difficulty?

The tone adapts, and you can offer a payment plan. A written, dated agreement protects both sides. You can also pause reminders for a client at any time.

Is claiming late payment interest really legal?

In France, yes. Between businesses, article L441-10 of the French Commercial Code provides for late payment interest due without any reminder, plus a €40 fixed compensation for recovery costs. Le Frac calculates them for you; you’re free to claim them or waive them. Other countries have their own rules.

Is the calculator reliable?

It’s a deliberately simple estimate based only on what you enter. It gives an order of magnitude of the cash tied up with your clients, not a promise of results. Your accountant can refine it with your real data.

Which software does Le Frac work with?

Any that exports to CSV or Excel: Pennylane, Sage, EBP, Henrri or a simple spreadsheet. You import your clients, then your unpaid invoices.

What data do you use?

Only the information needed for reminders: invoices, due dates, billing contacts, in line with the GDPR.


Put your invoices back on the path to payment.

Reminders that understand your clients, for cash flow that can breathe. For businesses invoicing in France.

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