I don't think it will stop foreign hiring for R&D, since the cost differential is often greater than the tax obligation would be.
E.g. if you pay $150K for local research, you expense $15K (10%) the first year (and 30K the subsequent year). You pay taxes on $135K of 'profit'. Let's say that's $45K (I have no idea what's realistic here.
Alternately you pay $130K for a dev from Canada, expense $4,333 (1/30) the first year, and pay tax on the remaining 'profit' of $125,666. Even after admin costs you're coming out ahead
E.g. if you pay $150K for local research, you expense $15K (10%) the first year (and 30K the subsequent year). You pay taxes on $135K of 'profit'. Let's say that's $45K (I have no idea what's realistic here.
Alternately you pay $130K for a dev from Canada, expense $4,333 (1/30) the first year, and pay tax on the remaining 'profit' of $125,666. Even after admin costs you're coming out ahead