Michel,
The corporation is registered in Canada. That is the big issue.I already answered elsewhere, but I understood that what matters is the location of service provision. If service is provided offshore, no tax is charged locally. If Universal Thread is provided by an offshore company, surely you can export your valuable services to that overseas company with no local sales tax.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
