Each model 3 at $47k will generate 13% HST. 8% goes to Ontario. So each model 3 is at least $3,760 in Ontario taxes.
so a 1000 model 3's = $14,000-$3,760
Keep in mind that the rebate is based on MSRP so a Chevy Bolt at MSRP of $47,000 could be a better deal depending on what you actually paid...