What a valid UK VAT invoice must include
If you are VAT-registered, a full VAT invoice must contain: your business name and address, your VAT registration number, a unique sequential invoice number, the invoice date, the customer's name and address, a description of the goods or services, the net amount per line, the VAT rate, the VAT amount, and the total including VAT.
For invoices below £250 including VAT, a simplified invoice is permitted, showing just your name, VAT number, date, description, and the VAT-inclusive total with the rate. Many freelancers send simplified invoices when a full invoice is required -- this can cause issues during a VAT inspection.
Create compliant invoices with the invoice generator.
Making Tax Digital: what changes for freelancers
Making Tax Digital for Income Tax Self Assessment (MTD ITSA) will apply from April 2026 for self-employed people and landlords with income above £50,000, and from April 2027 for those earning above £30,000. Under MTD, quarterly digital submissions replace the annual self-assessment tax return.
This means maintaining digital records of all invoices and expenses throughout the year, using approved software. Spreadsheets are permitted only if bridging software is used to connect them to HMRC. Ignoring this transition and continuing with paper records will not be an option from the relevant start date.
What an invoice cannot fix
An invoice is a request for payment, not a contract. If the scope, price, or delivery terms were not agreed in writing before work started, the invoice alone does not prove the terms. In a payment dispute, a signed proposal or purchase order carries more legal weight.
A late payment fee mentioned only on the invoice -- without prior agreement -- may not be enforceable. Under the Late Payment of Commercial Debts Act, businesses can charge statutory interest (8 % + Bank of England base rate) and a fixed compensation fee (£40 for debts up to £999) automatically, but only if you issue the invoice on time and have a written agreement for payment terms.