Like Kiwi I use my credit cards for everything and pay my credit cards off every month. I do this for the points. The last two months I’ve been restoring my RR and doing some home improvements. I purchased about $40,000 worth of stuff on credit cards. Since that time my score has gone from 835 to 697. I really don’t care as I’m not planning on taking out any loans, but I find it funny that I could go finance a $60k car and it has minimal impact on my credit score, but carrying large credit card balances wreck your score. I haven’t even carried any balances on the credit cards or paid any interest charges. All of it will be paid next month. It will be interesting to see how long it takes to go back up. I also like to use those 0% for x amount of months plans on large purchases so my money continues to make interest before I pay it off. And one more tip. If you are going to make a really large purchase, shop around for a new credit card. Most have no interest for up to 2 years on promotional balances. Keep your money in your investments making interest for 2 years and then pay them off. If you have good credit and aren’t overloaded with debt it’s easy to make the banks make you money.