Monthly progress invoicing for trades: avoid VAT traps

Progress invoicing is the practice of billing a client in stages as work is completed, rather than waiting until a project finishes. It exists mainly to protect cash flow on longer jobs, letting you claim payment for work already done instead of funding materials and labour out of your own pocket for weeks or months. It suits construction, staged installs and any job where costs build up over time.

TL;DR

• Using itemized schedules of values reduces disputes and simplifies tracking progress by linking each payment to specific work completed.
• Submitting invoices on the contractual date and attaching supporting evidence like photos or delivery tickets speeds up payments and avoids delays.
• Applying the correct VAT treatment and understanding the statutory notice process prevents overpayment disputes and ensures compliance in staged billing.
• Larger projects benefit from a full schedule of values for precise partial billing, whereas small jobs with clear stages suit milestone billing.
• Billing from the job site immediately after work completion keeps the process within statutory deadlines and improves cash flow.

What progress invoicing means and the terms you'll meet

Progress invoicing, also called progress billing or staged billing, means splitting the total contract value into instalments tied to work completed, rather than issuing one invoice at the end. The client pays as the job progresses, which keeps your working capital moving on projects that run for weeks rather than days.

Two approaches sit under this umbrella and it helps to know the difference before you agree terms:

• Percentage-of-contract billing: you invoice a fixed share of the total contract value at agreed intervals, often monthly.
• Milestone billing: you invoice a set amount when a specific, defined stage is reached, such as first fix completed or a kitchen installed.
• Schedule of values billing: you break the contract into priced line items and bill each one according to how much of it is actually done.

Construction and fit-out trades tend to use schedule of values because it ties payment to verifiable work. Professional services and smaller installation jobs often use milestone billing because the stages are simpler to define and check.

How the billing cycle actually works on site

Most progress invoicing runs on a monthly cycle, and the mechanics are consistent whether you're doing a rewire or a full refurbishment.

1. Build a schedule of values: break the contract price into discrete, priced items, such as first fix electrics, plastering, or kitchen units supplied.
2. Assess percentage complete: at the end of each period, go through the schedule and record how much of each item is finished.
3. Prepare an application for payment: this document sets out what's been done, at what value, minus anything already paid, to arrive at the amount now due.
4. Convert the application into an invoice: once the amount is agreed, or the notice period lapses without challenge, you issue the actual VAT invoice for that sum.
5. Track cumulative totals: each invoice should show the total contract value, amount billed to date and the balance remaining, so nobody has to dig through old paperwork to check.

Supporting evidence matters more than most tradespeople realise. Photos of completed work, delivery tickets for materials, and a simple site diary noting what was done and when all strengthen your position if a client queries the valuation. A well-prepared application that includes a schedule-of-values breakdown, percentage completion per item, variations and retention calculations gives you a far stronger footing in any dispute than a rough percentage guess.

Payment law and VAT rules you need to check first

An application for payment and an invoice are not the same thing, and confusing them causes real problems. Under the Housing Grants, Construction and Regeneration Act and most standard contract forms, the application triggers a statutory notice process: it sets out what you believe is due, and the payer then has defined windows to respond.

• A payment notice must usually follow within a set period after the due date, confirming the sum the payer intends to pay.
• A pay less notice must be issued before the final date for payment if the payer wants to pay less than applied for.
• Missing either notice can mean the payer owes the full sum applied for, regardless of whether they actually agree with it.

This is a genuinely useful procedural point: a clear, correctly dated application for payment can function as the default payment notice if the payer fails to issue their own, which is one reason getting the paperwork right matters as much as getting the work right.

The VAT treatment of staged payments is not automatic. Under HMRC's rules on periodic payments, the tax point for a staged payment is generally the earlier of the date you receive payment or the date you issue the VAT invoice, meaning you can create a VAT liability simply by invoicing early, before the cash lands. Construction also carries its own layer of complexity: the domestic reverse charge, in force since 1 March 2021, shifts the VAT accounting obligation to the customer for certain building and construction services, so check VAT Notice 708 for scope before you assume standard rules apply. For anything beyond a straightforward staged job, particularly reverse-charge contracts or mixed-supply projects, get an accountant or contract specialist to check the detail before you invoice.

Setting up progress invoicing step by step

Before you touch a template, decide which billing method fits the job. Small refurbishments with two or three clear stages usually suit milestone billing. Larger builds and multi-trade contracts are better served by a full schedule of values, because it lets you bill precisely for partial completion of any item rather than waiting for a whole stage to finish.

Once you've picked a method, your invoice template needs to carry enough detail to survive scrutiny:

• Contract reference and billing period covered by the invoice.
• Schedule-of-values breakdown or milestone description, with value and percentage complete.
• Previous payments received, so the running total is transparent.
• Retention held, where the contract specifies it.
• VAT details, including the rate applied and whether reverse charge applies.

Keep evidence attached to each invoice, not filed separately. Photos, signed delivery tickets and valuation notes all become useful the moment a client questions a figure, and they're far easier to find when they sit alongside the invoice they relate to rather than scattered across a phone's camera roll.

Pro Tip: Number invoices sequentially against the contract, not just by date, so you and the client can both see at a glance how the cumulative total is building.

Tracking part-payments matters as much as issuing the invoice. Note what's been paid against each invoice, chase anything overdue promptly, and send a friendly reminder before it becomes a difficult conversation rather than after.

Reducing disputes and getting paid faster

Small changes to how you invoice make a measurable difference to how quickly you get paid and how often clients push back.

• Use an itemised schedule of values rather than a vague overall percentage; it ties each pound to a specific, checkable piece of work and reduces disputes because nothing is left open to interpretation.
• Submit applications and invoices on the contractual date, then follow the statutory notice timetable closely rather than letting deadlines slip.
• Attach clear photos, measurements and references to any instruction or change order, so the client can see exactly what they're being asked to pay for.
• Manage retention and change orders explicitly: record every variation in writing, get it approved before you build it into a valuation, and keep retention calculations visible on every invoice.

Why fast, on-site invoicing changes the payment timeline

The gap between finishing work and sending the invoice is dead time that works against you. Every day an application sits unwritten is a day closer to missing a statutory notice deadline, and a day further from being paid. Invoicing from the site, while the work and the evidence are fresh, keeps you inside the payment timetable rather than chasing it.

How VanBill supports progress invoicing on the job

VanBill handles the parts of this workflow that usually cause delay: one-tap invoice creation from a quote, built-in VAT and CIS fields, part-payment tracking so you can see what's outstanding against each stage, and friendly reminders that chase payment without an awkward phone call. Invoices go out by PDF, WhatsApp or email straight from the job site, which matters most on longer, staged contracts rather than quick one-off jobs.

If you're running multi-stage work and want invoicing that keeps pace with it, VanBill starts with a free trial — create an account and try it on your next staged job, no card needed.

FAQ

What is progress invoicing?

Progress invoicing is billing a client for work completed at intervals throughout a project, rather than in one lump sum at the end. It's common on construction and installation jobs where costs build up over weeks or months, and it keeps your cash flow moving alongside the work.

What is it called when you process invoices?

The general process of creating, sending and recording invoices is usually called invoicing or invoice processing. On staged contracts, the specific document setting out what's due for a period is often called an application for payment before it becomes the final invoice.

What is progress billing?

Progress billing is another name for progress invoicing: charging a client in instalments as a project moves forward, usually based on either a percentage of the contract or a schedule of values. It's the standard billing approach on longer construction and fit-out contracts.