What's generally on an invoice?

This is general information only — it is not legal or tax advice, and it is not specific to any country's rules. Invoice requirements vary a lot by country, industry, and business type. If you need to know exactly what your invoices are legally required to contain, ask an accountant or a lawyer licensed where you operate. facturium does not add or check country-specific tax rules.

With that said, most invoices used in practice tend to share a similar shape:

• The business issuing the invoice: name, address, and often a tax ID.
• The client being billed: name, address, and usually a contact email.

• An invoice number, unique to that invoice.
• An issue date, and often a due date (or "due on receipt").
• Sometimes a purchase order (PO) or other reference number the client uses internally.

• One or more line items, each with a description, a quantity, a unit (like "hours" or "units"), and a rate.
• A subtotal, calculated from those line items.
• A discount, if any — as a percentage or a fixed amount.
• A tax amount, if applicable — usually a rate applied to some or all of the subtotal.
• A total: what the client actually owes.

• Payment instructions: where and how the client should send money (bank details, IBAN, a payment link, and so on). See getting paid.
• Sometimes notes or terms — late-payment policy, a thank-you note, return/refund terms, and so on.

Again: not legal or tax advice. This list does not cover jurisdiction-specific requirements like mandatory tax registration numbers, sequential-numbering rules, e-invoicing formats, language requirements, or retention periods — all of which vary by country and change over time. facturium's builder gives you fields for the generic shape above; whether that's sufficient for your situation is a question for a professional, not this guide.