I know this varies state to state. I am not incorporated. In the past I have not added any kind of tax onto the invoice unless I was handing over a deliverable, in which I've been told you have to charge NY state sales tax on the whole invoice. 

However for strictly digital delivery and rendering of services is there a NY state service tax or anything I should be adding on? 

Furthermore are there any "legal" templates for these kinds of invoices? Taxes are coming up and I want to make sure everything is above board as I had a lot of work last year. Going forward I want to keep it all nice and organized. I know I should probably hire an accountant...

-TG