My rent hits on the 1st — make sure checking is covered.
You'll be $480 short on the 1st. I can pull $500 from savings on the 31st (keeps your APY intact for the month) or move $500 from your brokerage cash sweep. Which one?
Use savings. And do this every month from now on.
Done. I've set a recurring rule: 24 hours before rent, top up checking to cover it from savings. I'll notify you each time and stop if your savings dips below your $10k floor.