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10 Credit Card Mistakes That Cost You Money

Avoid these common credit card mistakes that drain your wallet and hurt your credit score.

CardClassroom Team January 15, 2026

10 Credit Card Mistakes That Cost You Money

Credit cards are powerful financial tools, but common mistakes can turn rewards into losses. Here are the top mistakes to avoid.

1. Carrying a Balance

The average credit card APR is over 22%. Carrying a $5,000 balance costs you $1,100+ per year in interest. No rewards card earns enough to offset that. Always pay your statement balance in full.

2. Only Making Minimum Payments

A $5,000 balance at 22% APR with minimum payments takes 18+ years to pay off and costs over $7,000 in interest. If you cannot pay in full, pay as much as you can each month.

3. Missing Payments

A single missed payment can:

Set up autopay for at least the minimum payment. Then manually pay the full balance.

4. Ignoring Your Credit Utilization

Using more than 30% of your available credit hurts your score. If you have a $10,000 limit, keep balances below $3,000. For the best scores, stay under 10%.

5. Closing Old Cards

Closing a card reduces your available credit and shortens your credit history, both of which lower your score. Keep old no-fee cards open, even if you rarely use them. Put a small recurring charge on them.

6. Not Reading the Fine Print

Always understand:

7. Cash Advances

Cash advances typically charge:

  • 5% transaction fee (minimum $10)
  • 25%+ APR with no grace period
  • Interest starts accruing immediately

Never use your credit card for cash advances. Use a debit card or bank transfer instead.

8. Chasing Rewards with Unnecessary Spending

Spending $1,000 extra to earn $20 in rewards is a net loss of $980. Only use credit cards for purchases you would make anyway.

9. Not Using the Right Card for Each Purchase

If you have multiple cards, use the one that earns the most for each purchase category. 3% on dining with your Amex is better than 1.5% with your Visa.

10. Ignoring Purchase Protections

Many cards offer valuable protections that people never use:

Check your card benefits before buying separate insurance.

Advertiser Disclosure: Some of the card offers on this site are from companies from which CardClassroom receives compensation. This compensation may impact how and where products appear on this site, but does not affect our editorial opinions or ratings. Our recommendations are always based on objective analysis.

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