How to invoice as a UK freelancer in 2026 (and what changes with Making Tax Digital)

There are 4.4 million self-employed people in the UK, and from 6 April 2026 the 270,000 of them earning over £30,000/year will need to keep digital records and file quarterly updates to HMRC under Making Tax Digital for Income Tax (MTD IT) — a change that catches most new freelancers by surprise and affects how you should be invoicing now, not later.

What every UK invoice must include

HMRC does not have a mandated invoice template, but a UK invoice must include six fields to be valid and recoverable if the client disputes it:

1. A unique invoice number — sequential, no gaps. Start at 0001 on your first invoice of the tax year and never re-use a number.
2. Your business name and address — must match what is on your HMRC self-assessment / UTR records. Sole traders should use the name on the UTR; limited companies use the registered company name.
3. The date you issued the invoice — not the date the work was done, not the date you got paid.
4. A description of the work or goods — clear enough that the client can match it to a purchase order. "Consulting services" is too vague; "Brand strategy workshop, 2 days, 14-15 May 2026" is right.
5. The amount due — clearly in GBP. If you invoice in a foreign currency, also include the GBP equivalent at the agreed FX rate and the date of the rate (see our multi-currency guide).
6. Your VAT number — only if you are VAT-registered. If you are not, do not put "VAT" or a VAT number on the invoice, and never charge VAT unless you are registered.

Do I need to charge VAT?

You must register for VAT and charge 20% VAT on your invoices if any of the following are true:

• Your turnover in the last 12 months exceeded £90,000 (the 2026-27 threshold — frozen since 2024).
• You expect your turnover in the next 30 days to exceed £90,000.
• You voluntarily registered (some freelancers do this to reclaim VAT on expenses — usually only worth it if you have significant B2B expenses).

If you are under the threshold, your invoice is simpler: no VAT line, no VAT number. Just "Total: £1,000.00" with nothing else. Adding "VAT not applicable" or a £0 VAT line is fine if the client has requested it for their own bookkeeping, but it is not required.

Reverse charge for construction (CIS)

If you are a subcontractor in the construction industry and your contractor is CIS-registered, the CIS reverse charge applies: you invoice with 0% VAT, and the contractor accounts for the VAT on their own return. The invoice must clearly state "Reverse charge: CIS supply, customer to account for VAT" or HMRC will treat it as a standard 20% VAT sale.

What changes with Making Tax Digital in 2026

HMRC is rolling out Making Tax Digital for Income Tax in two phases:

• From 6 April 2026: self-employed people and landlords with gross income over £30,000/year must keep digital records and submit quarterly updates to HMRC using MTD-compatible software.
• From 6 April 2027: the threshold drops to £20,000/year, capturing most full-time freelancers.

In practice, this means your invoicing tool must:

• Store invoices digitally in a structured format (PDFs in a folder do not count).
• Record each invoice with a date, amount, and unique reference that can be exported to HMRC.
• Be able to produce quarterly summaries of income (cumulative) and expenses (per category) without manual re-keying.

A clean UK invoice template that scales

You can write your first UK invoice by hand on a Word doc, but as soon as you send a second one, switch to invoicing software. The minimum features that pay for themselves in the first month:

• Sequential invoice numbering that never resets or skips — and never lets you re-use a number when amending.
• Per-client defaults (address, VAT number, payment terms) so you do not retype them on every invoice.
• Automatic "due in X days" math and a payment link so the client can pay by card or bank transfer without a back-and-forth email.
• A running totals dashboard so you can see quarterly income without exporting to a spreadsheet.
• A VAT MOSS / reverse-charge toggle if you have EU or CIS clients.

What to put in your payment terms

Most UK freelancers default to "30 days" because that is what their agency client asked for. Three things to layer on top:

• A late-fee clause — "Late fee: £25 per week or part thereof, calculated daily from the due date." This is enforceable under the Late Payment of Commercial Debts (Interest) Act 1998 for B2B invoices; the statutory interest rate is 8% above Bank of England base rate.
• A clear payment-rail preference — "Pay by bank transfer (sort code XX-XX-XX, account XXXXXXXX) or card via the link in this email."
• A reminder cadence you actually send — the easiest way to make late payment a non-issue is automated reminders on day 1, day 7, and day 14. Most invoicing software (including Invosi) sends them for you.

Written by Daniel Mercer.