Invoice knowledge base

Become an expert in invoicing and optimise your business accounting.

Invoices

What information needs to be on an invoice?

What are VAT invoices and who needs to issue them?

What's the difference between a receipt and an invoice?

How to create an invoice

Zero-rated and VAT-exempt products or services & your invoices

When to use an invoice vs. a quote

When should I issue an invoice?

Time limits for issuing invoices

Should I put my UTR number on my invoices?

Proforma invoices and VAT

Credit notes & other sales documents

The role of a credit note in invoicing

How to legally change an invoice with a credit note

What is a quote and how do you write one?

Invoice, proforma invoice, quote, delivery note - differences and functions

How to correct an incorrect invoice

Should I send my customer a quote or a proforma invoice?

Delivery note templates for Word and Excel

Invoicing Software

The different types of invoicing software

The benefits of online invoicing software

Getting started with SumUp Invoices

Invoicing software for freelance architects

Invoicing software vs. Excel

Invoicing software for freelancers and small businesses

Is it mandatory to use invoicing software?

Invoice payments

Can you use a proforma invoice for a deposit?

What are invoice payment terms?

How to manage overdue invoices

What is a payment receipt?

Managing deposits with invoicing software

How to apply late fees to invoices

The advantages of online payments for your invoices

VAT between the UK and the US

Invoice templates

Invoice templates for Word and Excel

Invoice templates for plumbers

Invoice templates for sole traders

Invoice templates for auto garages

Invoice templates for cleaning services

Invoice templates for construction services

Self-employed invoice templates

VAT-exempt invoice templates

Proforma invoice vs. completed invoice template

Freelance copywriter? Make your invoices as easy to understand as your copy