I got my first credit card at 22 with a $2,000 limit. Within two years, I'd made pretty much every mistake possible. Here's what they cost me in actual dollars.
Mistake 1: Paying only the minimum
I carried a $3,200 balance for 14 months at $80/month. At 21% APR, I paid about $780 in interest.
Real cost: ~$780. Minimum payments are designed to keep you paying forever.
Mistake 2: One late payment
Missed by 4 days. Late fee: $35. Credit score dropped 60 points, which meant my car loan had a 1.5% higher rate — costing about $900 extra.
Real cost: $935. Set up autopay.
Mistake 3: Taking a cash advance
Took $500. Fee: 5% ($25). Interest at 25% APR started immediately — paid back in 2 months, cost $46 total. Real cost: $46.
Mistake 4: Closing my oldest card
Score dropped 25 points. Affected my next apartment application.
Mistake 5: Not checking statements
Had a forgotten $14.99/month subscription for 2 years. Real cost: ~$360.
If you're carrying balances, our credit card repayment calculator shows exactly when you'll be debt-free.