5 Big Credit Score Killers & How You Can Avoid Them
It's not just bankruptcy, foreclosure or short sale you and your credit score have to worry about. · Credit.com

Bankruptcy. Foreclosure. Short sale. These are the items that probably jump to mind when you hear the words "credit score killers," but there are plenty of other line items that can really tank your credit — particularly if your score was stellar at the time they hit your credit report. But knowledge is power — and many credit score crushers can be easily circumvented or ultimately addressed. (You can see where your credit currently stands by viewing two of your free credit scores, updated every 14 days, on Credit.com.)

Here are five big credit score killers — and how to avoid them.

1. A First Missed Payment

Blame it on the fact that payment history is the most important factor of credit scores, but, yeah, the first time you go past due, expect your numbers to take a dive. Per a FICO study, a single 30-day late payment can cause a good credit score of 780 to fall 90 to 110 points. An average score of 680, meanwhile, can fall by 60 to 80 points. And that blemish will stay with you for awhile —seven years from when the delinquency occurred, in fact. (Here's the full list of how long stuff stays on your credit report.)

The good news? If you course-correct, your score should steadily rebound the further you get away from that date. Plus, no guarantees, but there are things you can do to avoid winding up with a missed payment on your credit file in the first place.

How to Avoid a Missed Payment: Set up auto-pay from a linked checking account each month. If that move makes you wary, sign up for alerts that'll let you know when your bill is about to come due — or whether you've just missed one. And, if you do mistakenly skip a due date, call your issuer to make it right. They may be willing to waive the late fee and not report the missed payment to the credit bureaus "just this one time," especially if you've never missed one before.

2. An Error

Because they happen. And more often than you think. Per a 2012 report from the Federal Trade Commission, one in five Americans had an error on their credit reports. Some of these mistakes are innocuous enough — a misspelled name, for instance, won't drop your score. But a bunch of missed payments that don't belong to you certainly will, as would new credit accounts used (and abused) by an identity thief.

How to Avoid an Error: You can't, unfortunately. But you can certainly stay on the lookout for them by regularly checking your credit. If you find an error, be sure to dispute it right away with the credit bureau(s). And, if you've got more than one mistake weighing you down, check out our guide to DIY credit repair.