I've been doing the same for a while. SaaS with most customers in the US, but the corporation is in Canada. The only hassle is that 10% of credit card charges f

I've been doing the same for a while. SaaS with most customers in the US, but the corporation is in Canada. The only hassle is that 10% of credit card charges fail because banks may block international transactions. So we have to tell clients to call their banks, etc. Not perfect, but better than dealing with cross-border taxes.