# Invoices & Business Docs

An invoice asks a customer to pay for goods or services already supplied, while a quote or estimate states a price before the work starts. Receipts and purchase orders list the same line items, discounts, tax and totals. The details a valid invoice must show, such as tax registration numbers, differ by country, so check your tax authority's rules.

## Tools

No tools are available here yet.

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Category: [Finance & Business Tools](https://techolm.com/finance-tools)