When I first started interpreting I designed an invoice in Apple Pages, and used that to do all of my billing for a long time. It was simple, clean, and it worked.
About a year ago I got tired of typing my hours into a Word document and decided to try one of several online billing apps that would allow me to track hours and generate invoices.
I tried Freshbooks, Zoho Invoice, and Harvest. I ended up choosing Zoho Invoice because it has a free option and seemed a lot more intuitive overall. I can enter hours each day into my timesheet, and then generate an invoice form un-billed hours whenever I need. Then I download a PDF of the invoice and email to my agency.
There are a lot of great options that I don’t use, such as emailing from within the app and allowing clients to pay online through a bunch of methods.
I’m curious. Do you use billing software as a contractor? If so, what? If not, how do you do your billing?