The reason paying off a loan can affect your credit is because it decreases the diversity of your credit in the eyes of lenders. This is similar to what happens when you close old accounts: when the number of credit resources decreases, your credit imperfections –– like missing a payment or two, or going over 30% on your credit utilization –– become more visible.
In the life of a grown-up, there are few feelings as anxiety-inducing as the moment when you get your credit report back, only to find that it’s not nearly as high as you anticipated. But fear not: there are a variety of perfectly good reasons why your credit score has taken a hit, and in this case, knowledge is power. The more you know about how your credit score operates and what can affect in, the easier it will be to get it back up to scratch.
Credit Reports Can Reveal Fraud: Financial fraud can take many forms, most of which will manifest on your credit report before anywhere else. The warning sign could be something as overt as an unknown account being opened in your name, a bankruptcy filing showing up in your public records or a collections account appearing unexpectedly. Or it could be something as simple as a change to your listed name and address. Regardless, you might not notice if you’re not plugged in to your credit report.“Many people think, ‘Well, I’m not about to apply for credit; I’m not about to get a loan; I don’t need to get my credit report,’” said Gail Cunningham, vice president of membership and public relations with the National Foundation for Credit Counseling. “Yes, you do because you could be a victim of identity theft.”That’s why you should review your reports at least once a year, and make sure that your free-credit-report provider offers free 24/7 credit monitoring, too (like WalletHub!). This will give you day-to-day peace of mind. And that figures to be worthwhile regardless of your current financial situation or plans for the future.
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In order to investigate this concern, the consumer group World Privacy Forum has made two studies regarding AnnualCreditReport.com. Their July 2005 study found that there were 233 domains with names very similar to AnnualCreditReport.com, of which 112 routed users to a variety of unintended destinations, including for-fee services, "link farms" and pornographic sites. The report concluded that the credit reporting agencies and the Federal Trade Commission needed to do more to rein in and shut down impostor sites. A follow-up study from RentPrep found that of the original 112 routed links, only six currently remain. 
Before you log onto AnnualCreditReport.com be ready to answer personal questions. In order for the Web site to verify that it is, in fact, you and that someone hasn't stolen your identify, you'll be asked a series of fairly detailed questions about your financial history. For example, when I got my credit report, Equifax asked to confirm what year I had taken a mortgage. I don't even own a house. So get ready for trick questions! They are very serious about your answers--I'm not sure what I did wrong, but I couldn't be identified by TransUnion, so I couldn't access my report. I had to mail in for it, rather than get it immediately online.
TransUnion, Experian and Equifax aren’t the only credit reporting agencies that track your financial performance. Tens of other companies across the country maintain data on your rent payments, check-writing history and insurance claims. Along with traditional credit data, this alternative information is then factored into the decisions made by financial institutions, landlords, employers and insurers.
Here, you’ll want to investigate addresses you see that are clearly wrong — in another state, for example — or variations of your name you don’t recognize. They could mean your credit information is getting mixed up with that of someone else, or they could be a sign of identity theft, which can drag down your scores and cause financial trouble. (You can learn more about the dangers of identity theft and how it can hurt your credit scores here.)
You are entitled to one free annual credit report from each of the credit bureaus every 12 months.In some states, and in some circumstances, you may be able to get additional free copies. To get your free copies of your credit reports, visit AnnualCreditReport.com. Remember to get and review copies from each agency, as this can help you spot any problems with your credit account.
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You can request your free credit report online, over the phone, or via the mail system. To get your free copy of a credit report online, head on over to https://www.annualcreditreport.com/. Then select your state from the drop down box, click “get report” and fill out your information. You will need your previous address if you have lived in your current residence for less than 2 years.
AnnualCreditReport.com is the only federally mandated and authorized source for obtaining a free credit report. The Federal Trade Commission cautions consumers to be aware of "impostor" websites that have similar names or are deliberate misspellings of the real name. Such impostor websites include websites with titles like FreeCreditScore.com.
Too many “hard” checks of your credit can ding your score. For example, if you apply for several credit cards at once, several credit inquiries will appear on your report. Too many credit checks (as well as applying for/opening too many accounts) can give the impression that you’re a credit risk. Apply for new credit accounts sparingly, to limit the amount of credit checks you may incur.
In Australia, credit scoring is widely accepted as the primary method of assessing creditworthiness. Credit scoring is used not only to determine whether credit should be approved to an applicant, but for credit scoring in the setting of credit limits on credit or store cards, in behavioral modelling such as collections scoring, and also in the pre-approval of additional credit to a company's existing client base.
Remember, each credit bureau uses a different credit scoring model and your reports may look different. This is because creditors are not required to furnish information to any or all three of the credit bureaus, so you may see one account show up on Equifax that isn’t being reported to either TransUnion or Experian (or any combination). That’s why it’s a good idea to get your annual credit report each year from the credit bureaus so that you can stay on top of what’s reporting.
Credit reporting companies must investigate the items in question — usually within 30 days — unless they consider your dispute frivolous. They also must forward all the relevant data you provide about the inaccuracy to the organization that provided the information. After the information provider receives notice of a dispute from the credit reporting company, it must investigate, review the relevant information, and report the results back to the credit reporting company. If the information provider finds the disputed information is inaccurate, it must notify all three nationwide credit reporting companies so they can correct the information in your file.