When it comes to your credit, most people know the basics: pay your bills on time and avoid overextending yourself. However, some actions that seem harmless—or even helpful—can actually harm your credit score. By understanding these unexpected pitfalls, you can take better control of your financial health and protect your FICO score.

1. Closing Old Credit Cards

It may seem logical to close credit cards you no longer use, but doing so could hurt your credit score. One key factor in calculating your score is the length of your credit history. By closing an old card, you reduce the average age of your accounts, which can negatively impact your credit.

2. Paying Off All Debt

While being debt-free is a great goal, lenders prefer to see that you can manage debt responsibly. Paying off all your debt and closing those accounts might lower your score. Keeping a small, manageable balance and making consistent, on-time payments shows lenders you’re capable of handling credit.

3. Co-Signing Loans

Helping someone by co-signing a loan might feel like the right thing to do, but it comes with risks. If the primary borrower misses even one payment, it will appear as a negative mark on your credit report, potentially lowering your score significantly.

4. Applying for Too Much Credit

Shopping around for loans, such as for a car or home, can seem like a smart move. However, applying for credit at multiple places within a short period can result in numerous hard inquiries on your credit report. Too many inquiries may lower your score and signal financial instability to lenders.

5. Ignoring Small Bills

Small bills like cable, streaming subscriptions, or a gym membership may not seem significant, but neglecting them can have long-term consequences. If a small bill goes unpaid and is sent to collections, it can remain on your credit report for up to 10 years, negatively impacting your score.

Taking care of your credit involves more than just paying bills on time—it’s about understanding the nuances that can unexpectedly lower your score. By staying informed, you can avoid these common mistakes and maintain strong financial health.

Disclaimer: The information provided here is for educational purposes only and should not be considered financial advice. For personalized credit or financial guidance, consult a licensed financial professional.