A job can be profitable on paper and still leave your bank account under pressure. Materials may need paying for weeks before the work starts, skips and plant are booked in advance, and employees or subcontractors often need paying before the customer settles the final invoice.
The practical answer is to plan the money at the same time as the work. Estimate when cash will leave the business, agree payments before the expensive points of the job, and put the complete schedule in writing before starting.
This does not mean demanding an unreasonable upfront payment. It means avoiding a situation where your business provides the customer with an interest-free loan for the entire job.
Why profitable trade jobs can still cause cash-flow problems
Profit and cash flow measure different things. Profit tells you whether the selling price should exceed the job costs and allocated overheads. Cash flow tells you whether the money is available when bills need paying.
Consider a builder who has sold a £24,000 refurbishment. If the direct materials, waste, labour and subcontractor costs total £14,400, the job appears to provide a £9,600 gross contribution before overheads, tax and other business costs. But if every cost must be paid before the customer pays anything, the builder may need to find the full £14,400 from existing business cash.
That cash might otherwise be needed for wages, VAT, van repairs, insurance or another job. Taking on more work can therefore make the immediate problem worse rather than better.
Calculate how much of the job you are funding
Before choosing deposit percentages, map the timing of the job. For each expected cost, record the amount and the date by which it is likely to be paid. Then do the same for customer payments.
Your peak job cash exposure is the largest gap between cumulative job costs paid and cumulative customer cash received. It is the amount your business may have to fund at the most demanding point of the job.
A worked example
Assume the £24,000 refurbishment has the following direct costs. The figures exclude VAT to keep the example straightforward.
| Cost | Expected timing | Amount |
|---|---|---|
| Main materials | 14 days before the start | £7,200 |
| Skip and plant | 14 days before the start | £600 |
| Subcontractor | During the job | £4,200 |
| Direct labour, fuel and consumables | By completion | £2,400 |
| Total direct cost | £14,400 |
With no customer payment until the end, peak exposure is £14,400. Now consider a payment schedule of 25% on acceptance, 25% before the start and 50% on completion.
| Stage | Customer payment | Job cash position after known costs |
|---|---|---|
| Quote accepted | £6,000 | £6,000 available against the job |
| 21 days before the start | £6,000 | £12,000 available before orders are placed |
| Materials, skip and plant paid | — | £4,200 remaining |
| Subcontractor paid | — | £0 remaining |
| Final direct labour and consumables paid | — | £2,400 funded temporarily by the business |
| Completion payment | £12,000 | £9,600 gross contribution before overheads and other obligations |
The schedule reduces the theoretical peak exposure from £14,400 to £2,400. It does not change the job's price or margin; it changes when the cash arrives.
This only works if cleared payment arrives before the relevant spending. An invoice raised the day before materials are ordered will not help if the customer has seven-day terms or pays late.
How to build a sensible payment schedule
1. Start with the job's cash requirements
Do not choose a 10%, 20% or 30% deposit simply because that is what somebody else uses. A plumber replacing a boiler has a different cost profile from a landscaper buying paving, aggregates and hired machinery.
List materials, subcontractors, plant, waste, delivery charges and direct labour. Include supplier deposits and items with long lead times. The aim is to understand when your business becomes financially committed.
2. Decide how much exposure the business can carry
Some temporary exposure may be reasonable, particularly where your own labour forms a large part of the cost. The important point is to make a deliberate decision rather than discovering the gap after the bank balance drops.
Keep a working cash buffer for normal overheads and unexpected problems. Do not assume that every pound in the bank can be committed to one customer's project.
3. Put payment points before major spending points
If £8,000 of windows must be ordered six weeks before installation, a payment due on the installation date is too late. Likewise, a pre-start payment will not protect cash flow if expensive bespoke work has already been commissioned.
Allow time for the invoice to be issued, the customer's payment terms to run and the money to clear. If a start date changes, review any date-based payment arrangements as well.
4. Keep the schedule proportionate and easy to understand
Each payment should have a clear label and amount. For example:
- Booking payment on acceptance: secures the agreed slot and covers early commitments.
- Materials and mobilisation payment: due before orders, plant bookings or site set-up.
- Progress payment: used on longer projects where a defined section of work has been completed.
- Completion balance: due when the agreed work reaches the stated completion point.
Avoid vague descriptions such as payment two or payment when nearly finished. Clear wording makes it easier for both parties to know what is due.
5. Make the total add up
The scheduled stages should equal the agreed contract value. On a £12,000 job, stages of 20%, 30% and 50% would be £2,400, £3,600 and £6,000. Check rounding, VAT and any customer-supplied items before sending the quote.
If you are VAT registered, VAT collected is not extra margin. Make sure your wider cash planning accounts for the amount that may need to be paid to HMRC.
Match the schedule to the type of trade job
| Type of work | Possible structure | Main reason |
|---|---|---|
| Boiler or consumer-unit replacement | Materials payment followed by completion balance | Equipment forms a significant early cost |
| Landscaping project | Acceptance, pre-start materials payment and completion balance | Paving, aggregates, skips and plant may be ordered early |
| Bespoke carpentry | Design or booking payment, manufacturing payment and installation balance | Labour and materials are committed before installation |
| Long refurbishment | Initial payment, agreed progress stages and completion balance | Costs arise throughout a longer programme |
These are examples rather than rules. The right structure depends on the job, your supplier terms, the customer and the contract. Terms for domestic consumers should be fair, transparent and proportionate. Obtain suitable professional advice if you are unsure about unusual, high-value or non-refundable arrangements.
Put the commercial details in writing
A percentage alone is not a complete payment term. The quote or contract should make it clear:
- how much is due at each stage;
- what event or date triggers the invoice;
- how long the customer has to pay;
- which payment methods are accepted;
- what counts as completion for the final balance;
- how variations and additional work will be approved and charged;
- what happens if a payment is late; and
- whether any right to postpone or pause work applies.
A quote records what has been offered and agreed. An invoice requests the payment. Neither one means the cash has reached the bank, so check receipt before making commitments that depend on it.
Common payment-schedule mistakes
Setting a deposit without checking actual costs
A 10% deposit sounds tidy, but it is not useful if 40% of the job value must be spent immediately. Base the schedule on the job's cash profile rather than a habitual percentage.
Leaving too much until completion
A large final balance can leave the business exposed throughout the job. It may also increase the effect of a completion disagreement. Use earlier, justifiable stages where the scale and duration of the work support them.
Starting before the agreed payment arrives
Repeatedly making exceptions teaches customers that the dates are optional. If work must proceed for a genuine reason, understand and record the additional exposure you are accepting.
Using new deposits to finish old jobs
This creates a dangerous cycle. The bank balance can look healthy while the business owes substantial work to several customers. Treat money received for future work carefully and monitor the cost still required to complete that work.
Forgetting variations
Extra sockets, upgraded paving or additional joinery can increase both cost and time. Record the revised scope and price before carrying out the variation where practicable. Depending on the work, you may need a separate invoice rather than trying to alter a stage that has already been billed.
A customer deposit is not automatically spare profit
A payment received before work is completed may need to fund materials and labour that the business still owes. It can also have accounting and VAT implications depending on the circumstances.
Keep visibility of customer money held against future work and avoid using the headline bank balance as a measure of profit. If you are uncertain about the accounting or tax treatment, check it with your accountant.
Using Tools2Done to keep stages connected
Tools2Done lets a trade business add a payment schedule to a quote. Each stage has a customer-facing label, a percentage, a preview amount and a trigger. Supported triggers include quote acceptance, a chosen number of days before the linked project's start date and project completion.
The percentages must total 100%. When a stage is invoiced, it is locked so the same stage cannot accidentally be billed again. The quote, invoices, payments, project costs and remaining amount to invoice can then be viewed as part of the same job record.
Variations, extra work and one-off deposits can be invoiced separately when they do not belong in the original schedule. Tools2Done's management reporting also distinguishes customer deposits held against future work from earned income, helping owners avoid treating all cash received as available profit.
Your next step
Choose one upcoming material-heavy job and map every expected cash outflow against the proposed customer payments. If your business is carrying a larger gap than you are comfortable with, revise the timing before the quote is accepted—not after the materials have been ordered.
Make the business side easier to manage.
Tools2Done brings your jobs, quotes, costs, invoices, payments and business records together so the paperwork follows the work.
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