Concepts.

How InvoiceScript handles tax rates, the difference between inclusive and exclusive pricing, rounding rules, and how tax is calculated on an invoice.

What an invoice is, what it is not, and what makes it different from a bill, receipt, quote, or statement.

How EU VAT works for sellers in the EU, how to set it up in InvoiceScript, and what the product does and does not do for you.

Why tax authorities require sequential invoice numbers, what happens when you skip a number, and how InvoiceScript handles numbering.

When to use each document type, how they relate to each other, and the lifecycle of a transaction from quote to payment to credit.

How the reverse charge mechanism works for B2B cross-border sales within the EU, and how to set it up in InvoiceScript.

How InvoiceScript records payments, what partial payment means, and how payment status transitions work.

What the EPC QR code on your invoice PDF does, which banks support it, and what it does not do.

What UBL XML export is, who needs it, what InvoiceScript exports, and what it does not do.

What self-hosting means for your invoicing data, what you are responsible for, and how to protect your records.