California adds 8.84%. Texas and Washington tax gross receipts rather than net income, so it’s hard to make a direct comparison. But overall, corporate taxes in Canada are considered low by international standards.
As for business regulation, the reality for a tech business is that you rarely cross any regulatory boundaries. Employment law is straightforward. You can fire people easily. There aren’t tons of hidden costs. A little bit is spent on healthcare (1.5% in BC, zero in most other provinces). When I hear from American colleagues they complain of red tape more than my friends in Canada do.