In the UK, it's the law – we include the standard 20% VAT for goods or services to VAT-registered businesses. If you're VAT exempt, buzz your Linkby rep to tweak your invoice.
Down under in Australia, we add the 10% GST as per legal norms. It's that extra bit needed after all the math. The government sets it at 10% of the goods or services value. Any questions? Chat with your Linkby rep!