What to know about e-invoicing in United Kingdom

What matters for you as a freelancer

• ✓Agency OS already produces a compliant invoice for this country today — no extra setup needed on your side.
• ✓If your client asks for an e-invoice, you can send one immediately.
• ✓Keep an eye on the mandate date above — it determines when e-invoicing becomes mandatory rather than optional for domestic B2B.

What you don't need to worry about

• –You don't need to change your invoicing workflow ahead of the mandate — Agency OS already outputs the required format.
• –Cross-border invoices to clients in other countries aren't affected by this country's domestic mandate.

What must be on a valid B2B invoice

• ·A unique, sequential invoice number
• ·Your name, address, and VAT registration number
• ·Customer's name and address
• ·Invoice date and the date of supply (tax point)
• ·Description, quantity, and unit price (excl. VAT) for each item
• ·VAT rate per item, total excl. VAT, and VAT amount shown separately

Source: GOV.UK / HMRC — Invoicing and taking payment from customers — official source