A stage payment plan is only as good as the invoices behind it. Planned stages that never get invoiced, milestones that drift, retention nobody reconciles. This is the workflow that carries a building job from first deposit to final payment without the end-of-job cash cliff.
- Agree the payment plan before work starts, in the quote.
- Invoice each stage the day it completes, never at month end.
- Show retention on stage invoices and release it as a separate invoice.
- Handle variations as their own invoice line, priced and confirmed in writing.
- Chase the day after due date; statement for anything older.
Why stage payments decide your cash flow
A building job invoiced in full at the end gives the customer all the leverage: the whole job is hostage to one invoice. Split into agreed stages, each payment is due as the work completes, and the most any customer can hold at once is one stage.
The workflow is procedural, not clever:
- Price the stages at quote stage. The builders quotation template shows scope, exclusions and staged payments on one document.
- Take the deposit before materials are ordered: the deposit invoice template covers the layout.
- Invoice each stage the day it completes. The stage payment template shows the split.
- Price and invoice variations separately: the variation order template shows the wording.
- Show retention on each invoice and release it separately: the retention template covers the two-stage treatment.
Building the payment plan
A payment plan that survives contact with the job has four properties:
| Element | What to agree | Why it matters |
|---|---|---|
| Deposit | Enough to cover materials and mobilisation | Cash before commitments; see the layout |
| Stage values | Milestones priced separately, summing to the contract | Invoices follow completion, not the calendar |
| Variations | Priced and confirmed in writing before the work | Variation wording prevents disputes |
| Retention | % held per stage, released at completion/defects period | Shown on every stage invoice, released as its own invoice |
| Due dates | Days from invoice, stated on each document | Interest and chasing run from the due date |
Two rules hold the plan together:
- Stage completion is evidenced. Photograph or snag-list each stage before invoicing it. A stage invoice backed by a photo is hard to argue with; a stage invoice without evidence is an argument.
- The customer never holds more than one unpaid stage. If stage 2 is unpaid past terms, the reminder sequence starts the next day: before stage 3 work begins, not after.
The stage-by-stage invoicing sequence
1. Deposit: before ordering materials.
Invoice the deposit the day the quote is accepted. The deposit is evidence of the agreement as well as cash flow: see how deposit invoices work.
2. First fix: invoiced the day it completes.
Show: gross stage value, work completed to date, retention held (if any), net due, due date. On subcontract work, the CIS deduction applies to the labour line.
3. Variations: priced, confirmed, invoiced.
An extra invoiced without written confirmation is a dispute waiting. The variation order template shows the confirm-then-invoice sequence.
4. Subsequent stages: same discipline.
Each stage invoice references the quote, states the stage completed and shows retention separately. On bigger jobs, valuations and applications for payment feed the same chain: see the valuation template.
5. Completion: the balance invoice.
The final invoice shows the whole position: contract sum, variations, retention held, amounts already paid, balance due. A customer statement is the cleanest way to present it.
6. Retention release: the forgotten invoice.
Retention is released at practical completion or the end of the defects period (whatever your contract says) and it only gets released if somebody invoices it. The retention release template covers the wording.
What breaks the workflow, and the fix
| Break | What it costs | The fix |
|---|---|---|
| Stages invoiced at month end | Weeks of cash flow per stage | Invoice the day a stage completes: terms wording sets the clock from the invoice date |
| Variations agreed verbally | Disputed extras, unpaid work | Confirm in writing before the work, invoice as a separate line |
| Retention never reconciled | Money left on the table at year end | Track retention per job in your records; reconcile at defects end |
| CIS calculated on the whole invoice | £800 over-deducted on a £14,000 job with £4,000 materials | Labour line stated separately: see the example |
| Chasing left to the phone | Invoices drift for weeks | Automated reminders, then a statement |
The chasing layer
Most stage payments clear without friction. The ones that do not follow the same escalation:
- A friendly reminder the day the invoice goes overdue.
- A firmer follow-up a week later, restating the amount and due date.
- Statutory interest plus fixed compensation on business debts: 8% above the Bank of England base rate plus £40, £70 or £100 per invoice.
- A statement showing all open invoices when more than one is outstanding.
Automated reminders cover the first two steps without you. Which is the single feature that changes collection behaviour most.
Year-end reconciliation
The workflow ends at the year-end handover: every stage invoiced, every variation priced and invoiced, every retention item tracked with its release date. A clean CSV export with CIS and VAT columns hands your accountant the whole position in one file: deposits, stages, variations, retention held and released.
FAQ
How should stage payments be invoiced on a building job?
Agree stage values in the quote, then invoice each stage the day it completes, showing the stage completed, retention held and net due. Never batch stages into a month-end invoice.
How much deposit should I take before starting?
Enough to cover materials and early costs. There is no legal cap on deposits for building work, but a reasonable proportion of the job is the norm and a paid deposit evidences the agreement.
How do I invoice variations mid-job?
Price the variation, confirm it in writing before the work, then invoice it as a separate line referencing the variation number. See the variation order template for the wording.
How does retention work on stage invoices?
Show the gross stage value, the amount held as retention and the net due on each stage invoice, then invoice the retention separately on release at completion or the end of the defects period.
What payment terms should stage invoices carry?
Whatever you agreed at quote stage, commonly 7 to 14 days between stages and 30 days on completion. State the due date explicitly on every stage invoice.
How do I reconcile stage payments at year end?
From your invoice records: contract sum, each stage invoiced and paid, variations invoiced, retention held and released. A CSV export with those columns hands the accountant the whole position in one file.
One last thing
The single habit that fixes most contractor cash flow is the invoice on completion day. Every stage that gets invoiced “at month end” is a week of your money funding the customer’s: over a four-stage job, that is a month of cash flow, for free, that the customer did not ask for.