Forecasting cash flow around the real payment cycle

Cash flow forecasting is not a guess at monthly turnover. It is a projection of money in against money out, dated to the day the cash actually moves. On a Singapore contract the money in is governed by the Building and Construction Industry Security of Payment Act, and that Act sets a rhythm you can model precisely.

The cycle that drives the curve

Each payment claim starts a clock. The respondent has a response window, capped at twenty-one days from the claim, or fourteen where the contract is silent. The payment then falls due, and the due date is capped at thirty-five days from the claim, or fourteen if nothing is agreed. So from claim to cash you are modelling weeks, not an open-ended wait.

• Claim date, when you value and serve, the reference point for everything after.
• Response window, up to twenty-one days, the respondent’s answer.
• Due date, capped at thirty-five days from the claim, when the money should land.

Money out does not wait for money in

Wages, plant and subcontractor payments run on their own dates, and those rarely line up with the thirty-five day cap on your inflows. The gap between paying for work and being paid for it is the funding requirement, and the peak of that gap is the number that tells you how much working capital the job needs. A forecast that ignores the payment dates hides that peak completely.

GST moves through it too

GST at nine per cent is collected on the invoice and remitted to the authorities on its own timetable. It flows in and back out, so it belongs in the forecast as a timing item rather than income. Netting it off silently distorts the curve at exactly the points where cash is tight.

What a good forecast lets you do

Once the curve is dated, you can see the trough before you reach it. That is the difference between arranging facility ahead of time and scrambling when a payment is a fortnight late. It also tells you which cycle matters most: the one where a missed payment response deadline, or a slow due date, would tip the job into a shortfall.

Model the amounts, then model the dates the SOP Act sets. A forecast built on the real cycle is a planning tool. One built on smooth monthly averages is a comfort blanket that fails you in the month it counts.