Regardless of what happens to the proposed credit card interest rate cap, a better credit score gets you access to better rates.
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Have a low credit score? Here's how to raise it

How to achieve a good credit score ...
The financial services industry has made substantial progress in democratizing access to credit scores. Today, 95% of banks and credit unions offer customers visibility into their credit scores ...
Discover why your U.S. credit score might not influence financial decisions abroad. Learn what you can do to establish good ...