September 1 Rent Day is a milestone. It’s the last one where you can earn double points on the Bilt Mastercard up to 10,000 points. It’s also the last one where tax payments will count towards the bonus. Starting with October 1 Rent Day the bonus will be capped at 1,000 additional points, and tax payments don’t count.
I’ve found Rent Day to be highly lucrative, and I’ve often maxed out this bonus.