Travel invoices have an unclear breakdown of tax.
For example with an Expedia invoice, there is a line called Taxes & fees
The best course of action I could find was completing this request:
Expedia will only break down flight itineraries, so if hotels were also purchased, it’s a waste of your time. I take the subtotal, multiply for the appropriate taxes (GST&PST or HST). Take that number out of the “Taxes and fees” amount. The rest are non taxable fees added to Travel expense
Thank you for your response