The deal now goes to the Organisation of Economic Co-operation and Development (OECD), which is overseeing two days of talks starting Wednesday to find a consensus among 139 countries.
G7 finance ministers agreed backed earlier this month a global minimum tax rate of at least 15% and thresholds for divvying up governments' rights to tax the profits on cross-border commerce.
Buoyed by a multi-trillion-dollar stimulus plan, the US economy was seen growing 6.9% this year, the OECD said, up from a previous forecast of 6.5%. It is expected to expand 3.6% in 2022, down from a 4.0% forecast in March.
It proposed the global minimum tax as a way to minimize the impact of a higher US tax rate on the competitiveness of American companies and deter them from shifting operations or profits to lower-tax jurisdictions.
The US representative and the Canadian minister also discussed the protracted litigation over Canadian lumber. Washington believes that this wood is sold below the market price to promote exports.
The announcement comes as insurers face climate-related losses and get to grips with climate risk in their portfolios.
As an interim step, Swiss Re said it would phase out coal exposure by 2030 for those countries belonging to the Organisation for Economic Co-operation and Development (OECD).