Earlier quoted context omitted.
If you’re on the bottom rung I’m guessing your interest rate is >20%, (the max is apparently 29.9%). Divide by 12 and one month of interest rate is as much, if not more, than 1.5% cash back. Using debt to save money depends on starting with a reasonable amount of money.
> put the $400 on the card ( and pay it off before paying interest ) Depending where you are in the credit cycle, it could be ~30-50 days before incurring any interest.
And of course 30 days without interest is basically "you pay it off in a months time".
I realized that another part of my problem with this column is of course that "using debt" for many people means a payday loan, which seem to be forever relabelling their "service" to avoid being called a 30%/week credit line.