A sale is finished when the money is in your account, which can be weeks after the goods leave or the work is done. Until then, you've lent the customer the value of the sale, without interest, and without much say over when you get it back.
For a business that sells on credit, this gap is often where the cash goes. And because it builds up slowly, a few days here, a slow customer there, it can be well advanced before anyone notices. So let's look at why customers pay late, and then at the routine that fixes most of it.
Why customers pay late
It's tempting to assume late payment is about customers who can't or won't pay. Sometimes it is. Often, though, the delay comes from something more ordinary, and much easier to fix.
The terms were never clear. If the customer doesn't know when payment is due, they'll pay when it suits them.
The invoice was late, wrong or missing something. A customer who receives the invoice two weeks after delivery starts counting from the invoice. A customer whose invoice has the wrong amount or no purchase order number sends it back, and the clock restarts.
Nobody asked. Many businesses pay their suppliers in the order they're chased. The supplier who calls gets paid; the one who waits, waits.
It's easier to pay someone else. If paying you means writing a cheque, finding a bank, or calling to ask for account details, you go to the bottom of the pile.
And sometimes, the customer is in trouble. Which is exactly why you want to find out early.
Notice that most of these causes sit on your side of the relationship. That's good news, because it means most late payment can be fixed by changing how you invoice and follow up.
Does that make sense? It's a bit like a queue at a counter. The person standing in line, visible, gets served. The one who left their number and went home gets a call when someone remembers. Customers paying their suppliers behave much the same way.
Set the terms before the sale
Collection starts before the sale, with credit terms that are agreed and written down.
Decide who gets credit. New customers, small one-off buyers and customers with a poor record can be asked to pay on order, or to pay a deposit. Credit is a privilege you extend to customers who have earned it.
Decide how much and for how long. A credit limit for each account, and a payment period: 30 days, 45 days, whatever suits your trade. Shorter terms for new accounts, longer ones for customers with a long record of paying on time.
Put it in writing. On the quotation, on the order confirmation, on every invoice. "Payment due within 30 days of the invoice date" is clear. "Payment terms as usual" isn't.
Ask for deposits on large or custom work. A deposit reduces your risk, funds the materials, and tells you the customer is serious.
Invoice immediately, and correctly
Every day between delivery and invoice is a day added to how long you wait for your money. Invoice the same day the goods go out or the work is done. Make sure each invoice has what the customer's accounts team needs to approve it: the right company name, a purchase order number if they use them, a clear description, the amount, the due date, and how to pay. Include your bank details, and accept the ways your customers find easiest: bank transfer, LankaQR, card, cheque.
A simple collection routine
One of the most effective things a business can do is run the same simple routine for every invoice, every time.
A few days before the due date: a friendly reminder. "Just a note that invoice 1043 for LKR 180,000 is due on Friday." Many late payments are fixed right here, because the reminder puts you at the top of the pile.
On the due date: if it hasn't arrived, a call, or a WhatsApp message to the person who approves payments. Ask when it will be paid, and write down the answer.
A week after: a firmer follow-up, referring to the date they gave you.
Two to three weeks after: a call from the owner or a senior person, and a pause on further credit until the account is up to date.
Beyond that: a written demand, and, for large amounts, a conversation with a lawyer about your options.
The routine works because it's consistent. Customers learn quickly which suppliers follow up and which don't, and they pay the ones who do first.
There's a chain worth seeing here. A cash shortage is often the result of money sitting with customers. That's the result of invoices paid late. And late payment is very often the result of a gap in the routine on your side: terms never stated, an invoice sent late, nobody following up. Fixing the routine reaches back to the start of the chain.
Keep an aged debtors list
Once a week, list everything customers owe you, sorted by how long it has been outstanding: not yet due, up to 30 days overdue, 30 to 60 days, more than 60 days. This is called an aged debtors report, and most accounting software produces one.
It does two things. It tells you who to call this week. And it shows you the trend: if the amounts in the older columns are growing, collection is slipping, and the earlier you see it the easier it is to fix.
The longer an invoice stays unpaid, the less likely it is to be paid at all. An invoice that is 90 days overdue is a much weaker asset than one that's 10 days overdue, whatever the accounts say it's worth.
Post-dated cheques
In many Sri Lankan trades, customers pay with cheques dated weeks or months ahead. It's worth being clear about what a post-dated cheque is: a promise of payment on a future date. For your cash flow forecast it's a receivable until that date, and until it clears.
Practical habits help: record every post-dated cheque with its date, deposit each one on its date, follow up immediately on any that bounce, and treat a customer whose cheques bounce as a credit risk for future orders. When you agree credit terms, the date on the cheque is part of the terms, so negotiate it like the rest.
What faster collection is worth
It's worth putting a number on this, because it's one of the cheapest sources of cash a business has.
A business that sells LKR 2 million a month and waits an average of 60 days to be paid has about LKR 4 million owed to it at any time. Bring that down to 45 days and the amount owed falls to about LKR 3 million. LKR 1 million moves from your customers' bank accounts into yours, once, and stays there for as long as you keep collecting at the new speed. No loan is that cheap.
The bigger point
Owners tend to move through three views of late payment. At first, asking feels awkward, so they wait and hope. Then, after enough waiting, they decide that customers in their trade simply pay late and nothing can be done. Eventually they see collection as part of the sale, designed in from the start through clear terms, prompt invoices and a routine that runs the same way for everyone. The routine also protects relationships, because a polite reminder on schedule is far easier for everyone than an angry call after three months.
How Gridwerk helps
Setting credit and working capital policies, building the collection routine and the aged debtors report, and working the effect into your cash flow forecast is part of our Process & Financial Control and Financial Intelligence work. If late payments are squeezing your cash, start with the free diagnostic. It's eighteen questions, about seven minutes, and then we call you to go through the rest.
Gridwerk diagnostic