How do you invoice your client and how much information do you give?
I have been using Quickbooks for many years and find that works well for me. Some use MYOB or other bookkeeping systems. Some use Paypal.
Whatever system you use I feel it’s important to itemise your invoice to the client so they know/understand where the time has been spent.
If you received a phone bill for $150 but no detail of how that figure was accumulated you would be wanting more information. The same applies when invoicing your own clients. Make sure you give them the information that is important to them.