Comment by alanbyrne

I agree with this 100%. As a SaaS business they are going to be spending a lot of time working out what state their buyers are in and what tax to add to the sale. For this reason we incorporated in the UK (We are London based) and charged no tax for our US customers. All we had to do was call the IRS and get an EIN to provide to our larger customers, which was a fairly painless and free process.