A coworker mentioned he was almost late for a credit card payment, so then we started discussing credit cards. He said he likes to keep his balance around 30% of his credit limit.
Me: What?! That's crazy dude, that is costing you so much!
Him: I need to build credit.
Me: Maintaining a balance doesn't help with that. I've never had a balance in my life and my credit score has been over 800 for as long as I can remember.
Him: Yea I heard it's good for building credit though.
Me: Well, it's not. You'd be far better off maintaining a zero balance. You would keep so much more of your money.
Him: Yea but i'd like to maybe buy a house one day and I need good credit for that. Plus I defaulted on a student loan for 3 months like 6 years ago.
Me: Dude, you don't need good credit to buy a house. They let dead beats buy houses. Plus any amount of savings you would see by raising your credit score is going to be dwarfed by paying insane APR on a huge balance on your credit card. And that student loan black mark will be off your credit score by the time you buy a house. They don't actually care what balance you maintained on your credit cards, it's more about if you are reliable and make payments on time (or late). It's just some algorithm that spits out a credit score, and keeping a balance on your card actually hurts that score, and your past balance is irrelevant.
Him: Yea, but I need to build credit.
Why does everyone have this idea that you must maintain a balance on your card to get a good credit score? And why do they insist they are correct in spite of evidence to the contrary? I have heard so many people tell me this, and they all have terrible credit (because they are the people likely to maintain a credit card balance).