Every day between finishing and invoicing is a day the customer’s enthusiasm fades and your money sits somewhere else.
7 September 2026 · 5 min read
There is a window, and it is short. The customer is standing in front of finished work they are pleased with, they have not yet had this month’s other bills, and the job is the most real it will ever be to them. An invoice that arrives in that window gets paid far more often than one that turns up on Tuesday.
“Payment on completion” said at quote stage is a normal business term. Said on the doorstep at four o’clock on a Friday it sounds like suspicion. Put it on the quote, mention it once when you book the work in, and it is simply the arrangement rather than a request.
Not that evening. Before you drive off. This is the single highest-value habit in this entire article, and the only reason it does not happen is that it usually means a laptop. It does not have to — if the job has been tracked as you went, ending it and generating the invoice is two messages, and the PDF arrives in the chat you already have open.
Bank details on the invoice are the minimum. A tappable pay-now link is better, because the customer can settle it standing in their own hallway rather than “when I’m at the computer”. GraftG’s Pro plan puts a secure pay-online link on invoices alongside your bank details — see pricing for what sits on which plan.
Same-day payment on a £6,000 job is a big ask; same-day payment of the balance when you took a deposit up front is not. Deposits also filter out the customers who were never really going to proceed. How much deposit to ask for covers the amounts and the wording.
“That’s all done — I’ll send the invoice over now, it’s payable today, bank details are on it.” Cheerful, specific, unremarkable. Most people pay on the spot when asked plainly; almost nobody pays on the spot when nobody asks.
Some will not pay on the day, and that is fine as long as drifting has a limit. Have a chase sequence that fires without you thinking about it, starting the day after the due date — the detail is in chasing late payments politely, and GraftG’s Pro chasers will run it in your name so you are not the one nagging.
No, provided the term was set at quote stage rather than sprung at the end. Payment on completion is a normal arrangement across the trades — what makes it awkward is introducing it for the first time while standing in someone’s hallway.
Track the job as you work so labour and materials are already recorded, then generate the invoice from your phone. With GraftG that means ending the job and replying INVOICE, and the numbered PDF comes back into the WhatsApp chat ready to forward.
A tappable payment link, because it removes the “when I am next at the computer” delay. Bank details on the invoice should be there regardless, since plenty of customers prefer a transfer.
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