While this is good from a UX perspective, don't rely on tools like this to make sure that you include all information on an invoice that you're legally required to include. For instance, in the UK (which appears to be where this company is based), all invoices for VAT registered companies must carry their VAT Registration Number. However with this tool, even if you select to include VAT in the settings (which you mus…
Most contractors I know do exactly that. These 3rd party services are called accountants.
And I'm saying its a bad idea to rely solely on those 3rd party services to know whats what. Even Accountants. Certainly here in the UK, if your accountant messes up, you're still the one liable. You then have to chase after them for recompense, while they play the "you didn't give us enough information" or "read the T&Cs, we're not liable" game. I've seen it happen too many times.
By all means bring in the professionals to advise you and do the donkey work, but educate yourself on the rules and regs. "Trust but verify" their work.