FWIW, I put my property tax payment on my 18-month zero percent credit card. There’s a 1.88% fee for that. Never thought it was worth it to arbitrage credit card rates before, but considering the advice from some on here, I thought it’s give it a try.
I guess if you can float $20,000 on a credit card, that’s $1000 more per year you didn’t have before (at 5% on a CD).