A mixed-supply invoice is a document used to request payment while meeting the tax rules that apply to this type of billing. Getting it right protects both you and your client, keeps the books clean, and avoids disputes over what was agreed.
Every valid mixed-supply invoice should include the following mandatory details: 1. per-line VAT rate 2. clear item description 3. separate subtotals per rate 4. total VAT per band 5. your VAT number. Missing any of these can make the document harder to enforce or, where tax is involved, invalid for VAT purposes.
Tax treatment: When one sale combines items with different VAT rates, each line must carry its own rate. Do not blend them into a single average; allocate correctly per item. The rate applied here is 19%. When you bill business customers in another country, check whether the reverse-charge or zero-rating rule applies before you finalise the total.
A typical mixed-supply invoice lists concrete line items such as: Books (reduced rate) (5 x $20); Consulting (standard) (2 x $150). Always show quantities, unit prices, and the tax amount per line so the grand total is transparent and easy to verify.
Practical tips: 1. Group lines by rate to make the VAT obvious. 2. Check reduced-rate eligibility per item. 3. Keep the allocation defensible if audited.. Good invoicing habits - consistent numbering, clear payment terms, and prompt delivery - reduce late payments and build trust.
InvoiceFormly helps you produce a correct mixed-supply invoice in minutes. Pick the template, enter your details, add line items, and download a clean PDF or send it by email. Tax math, numbering, and multilingual labels are handled automatically so you can focus on the work.