Milestone invoice template UK (2026): CIS, VAT and gates
Milestone invoice UK, short answer: a milestone invoice bills a named milestone gate that the contract says is reached (for example “first fix complete”, “watertight”, or “practical completion certificate issued”) — not a periodic interim valuation / application cycle, not a named stage-payment schedule package, not an open % progress twin alone, not retention release, not snagging, not variation, and not a deposit. Who pays is set by the contract (main contractor, employer, or client). CIS may apply when a CIS contractor pays you for construction operations — soften with HMRC’s CIS overview and your accountant. A private householder paying for work on their own home is usually not CIS and is never treated as the CIS contractor for that home. If you are VAT-registered (threshold £90,000), show VAT correctly on taxable lines; if you are not registered, do not charge VAT.
Use this page when the PDF is a named milestone-gate invoice. It is not an interim payment (periodic valuation / application), not a named stage payment schedule package, not the open progress payment twin, not a retention release, not a variation / extras invoice, not a snagging / defects invoice, and not a deposit. This page is for named milestone gates — not periodic interim valuations or stage packages. Figures below are illustrative only. Need the PDF now? Open the free invoice generator (Free: 5 invoices; Pro £7.99 / Pro+ £12.99).
Who pays, CIS and VAT on a milestone invoice
Start with who certifies or pays the milestone and whether the work sits in construction operations.
Who pays you | Typical milestone job | CIS? | VAT if registered |
|---|---|---|---|
Private householder | Named gate on a domestic build they pay themselves (e.g. watertight) | Usually no — never treat them as CIS contractor for own home | Often 20% on ordinary domestic works — soften Notice 708; do not invent 0% |
Main contractor / CIS contractor | Milestone gate under a construction subcontract | May be in CIS base when ops are in scope — soften with HMRC / accountant | Normal VAT, or reverse charge only when eligible contractor tests met — never on a householder |
Employer / client QS | Certified milestone under a main contract | Depends whether the payer is a CIS contractor for construction ops | Show net / VAT / gross if registered |
Retention / variation / snag (not this page) | Holdback release, agreed extras, or punch-list remaking | Same CIS tests — use the sister templates | Same VAT rules |
CIS rates (0% / 20% / 30%) sit with the contractor when CIS applies — InvoiceAdept does not decide status and does not file CIS300. VAT threshold is £90,000. InvoiceAdept does not file VAT returns, MTD updates or Self Assessment.
Milestone vs interim vs stage vs progress vs retention vs variation
Use this page when the deal is a named milestone gate reached under the contract. Sister pages stay for sister intents.
Billing shape | When it fits | Invoice cue |
|---|---|---|
Milestone (this page) | Named gate reached (first fix, watertight, PC certificate, etc.) | Milestone label + gate evidence / certificate ref |
Periodic valuation date / interim application / certificate for a period | Interim no. + valuation date + this period vs cumulative | |
Named stage in an agreed payment schedule package | Stage number + schedule label | |
Open-ended % or valued progress framing on original scope | % complete / progress to date | |
Holdback previously deducted is now due | Retention % / amount, release trigger | |
Agreed change order that changes contract sum | VO / change-order ref | |
Punch-list remaking after practical completion | Snag list ref + item IDs | |
Upfront sum before (or as) work starts | Deposit % or fixed sum |
If the PDF only releases held retention, use retention. If the client agreed extras that grew the contract sum, use variation. Do not invent CIS on a householder milestone bill.
What a UK milestone invoice must include
Field | Always? | Milestone notes |
|---|---|---|
Your name or business name | Yes | Match Self Assessment / Companies House |
Your address and contact | Yes | Email helps QS / commercial queries |
Customer name and address | Yes | Ltd = registered name; add site address if different |
Unique sequential invoice number | Yes | e.g. INV-MS-2026-0002 |
Invoice date | Yes | Date of issue |
Tax point / supply date | If VAT-registered and different | Useful when gate date differs from issue date |
Description of milestone work | Yes | Site, milestone label, gate evidence, contract clause; “named milestone gate — not interim, stage package or retention” |
Contract / certificate / gate refs | Strongly recommended | Link the milestone definition and any certificate or photo pack |
Payment terms | Yes | Due date per contract (or 14 / 30 days if stated) |
VAT number, rates, VAT amount | If VAT-registered | Show net, VAT and gross |
CIS UTR / deduction narrative | When a CIS contractor pays you within scope | Omit on true householder PDFs |
Bank details | Strongly recommended | Sort code and account name matching the invoice |
Never reverse-charge a private householder. Never invent CIS on a domestic own-home milestone PDF.
Copy-paste milestone invoice example (illustrative)
Scenario: sole trader plumber invoices a main contractor for the named milestone “first fix complete” on a housing subcontract. Gate evidenced by contractor sign-off 2 Sep 2026. CIS registered at 20%. Not VAT-registered. Milestone sum £4,800 net (illustrative).
Line | Qty | Unit | Net |
|---|---|---|---|
Milestone — first fix complete at [site] (gate signed 2 Sep 2026) | 1 | milestone | £4,800.00 |
Retention (if deducted under contract) | Show separately or on retention sister when released | ||
Gross subject to CIS (this milestone) | £4,800.00 | ||
CIS deduction @ 20% | −£960.00 | ||
VAT | Not registered — net only | ||
Amount payable by contractor | £3,840.00 |
Narrate on the PDF: “Milestone: first fix complete at [site], gate signed 2 Sep 2026. Sum £4,800 net. Named milestone gate — not an interim valuation, stage package or retention release. CIS registered 20%. UTR on file.” Keep milestone PDFs separate from interim, VO, retention and snagging PDFs so AP can match the gate.
CIS, VAT and reverse charge cues
Topic | Practical rule |
|---|---|
Milestone for a CIS contractor on construction ops | May be in CIS base — soften |
Householder own-home milestone bills | Usually no CIS; never treat them as CIS contractor |
VAT threshold | £90,000 |
Domestic reverse charge | Never on a householder; contractor tests only |
Deemed contractor | £3 million construction-spend framing — not £1 million |
CIS vs VAT order | CIS on the CIS-liable amount excluding VAT |
InvoiceAdept | Does not file CIS300, VAT, MTD or Self Assessment |
Agreeing the milestone before you invoice
Confirm the milestone label, what evidence proves the gate, whether retention is deducted under the contract, and whether CIS will apply before you issue the PDF. Match the invoice lines to the contract definition so AP does not reject the bill.
Shape | How to show it on the PDF |
|---|---|
Named gate reached | “Milestone — watertight / first fix / PC certificate = £X” |
Gate evidence | Certificate number, photo pack, or contractor sign-off date |
Partial gate (rare) | Only bill if the contract allows a split; otherwise wait for full gate |
Retention deducted this milestone | Show deduction; use retention sister when holdback is released later |
Weak: “Milestone as agreed £4,800.” Usable: “Milestone first fix complete, gate signed 2 Sep 2026, £4,800 net, CIS 20%, not VAT-registered, not an interim or stage package.”
Payment terms and getting paid
Main-contractor milestone bills often follow the contract payment notice / pay-less cycle (commonly framed around 14 or 30 days from the due date in the contract). Householders often prefer 7 days or due on receipt once the gate is agreed. Put bank details on the PDF. Soften B2B late-payment interest with the contract and your accountant.
Common mistakes on milestone invoices
Mistake | Fix |
|---|---|
Vague “milestone as agreed” lump | Name the gate, evidence and contract clause |
Calling a periodic interim valuation a milestone | Use the interim payment sister for valuation cycles |
Calling a schedule stage package a milestone gate | Use the stage payment sister for schedule stages |
Mixing retention release into the milestone PDF | Keep holdback release on the retention sister |
Billing variations as “milestone” without a VO | Use the variation sister for agreed extras |
CIS narrative on a householder milestone PDF | Remove CIS lines when the householder pays |
Charging VAT when not registered | Net only until registered |
Reverse-charging a householder | Never — reverse charge is contractor-to-contractor when tests met |
Frequently asked questions
Is a milestone invoice the same as a stage payment invoice?
No. A stage payment bills a named stage in an agreed schedule package. A milestone invoice bills a named gate reached under the contract (which may or may not sit in a numbered schedule).
How is this different from an interim payment invoice?
Interim pages cover the periodic valuation / application cycle. This page is specifically a named milestone gate (label + evidence), not a period valuation.
How is this different from a progress payment invoice?
Progress pages often frame open % complete. This page is a discrete gate, not an open progress % twin alone.
Does CIS always apply to milestone invoices?
No. CIS may apply when a CIS contractor pays you for construction operations. Private householders on their own home are usually outside CIS — soften with HMRC / your accountant.
Can I put CIS deduction lines on a householder milestone invoice?
Usually no. If a private householder pays the milestone on their own home, leave CIS narrative off the PDF.
What VAT threshold should I use in 2026?
£90,000. Soften registration with your accountant.
Should retention sit on the same milestone PDF?
You can show retention deducted this milestone for clarity, but when holdback is later released use the retention template.
Where can I build the PDF quickly?
Use the InvoiceAdept free invoice generator — Free covers 5 invoices; Pro is £7.99 and Pro+ £12.99 when you need more.
Next step: build the milestone invoice
Cite the milestone label and gate evidence, keep householder vs contractor facts straight, show CIS arithmetic only when due (excluding VAT), and show VAT only if registered (£90,000 threshold). Open the free invoice generator, paste the lines from the worked example shape, and send when the gate is agreed. InvoiceAdept does not file CIS300, VAT returns, MTD or Self Assessment for you.
Last reviewed: 18 September 2026.
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