You can allow your accountant to access your file.
Some users are quite happy just to use the software through the App, whilst giving site access to their Accountant or partner to control the finer details.
It's not a bad idea.
You can use the eCashbooks Mobile APP to record your Invoices, Quotes and your transactions as they occur.
Your Accountant or Partner can then check your file and add the missing bits. Giving them access also means they will have real time data they need at anytime and from anywhere.
Simply give your accountant your LOGIN and you're right to go.
There is NO need for separate registration for your Accountant.
Be aware, of course, that you'll be sharing your username and password. And you can change that at anytime you please if your situation changes.