Your credit card issuer can lower your credit limit without warning — and there are a few reasons, in particular, that they'll do this. bernie_moto/Getty Images

In today's unusual economy, lenders are keeping a closer eye on risk. While inflation is cooling and interest rates may be on the way down, consumers are still carrying historically high levels of credit card debt — more than $1.18 trillion currently , according to the New York Fed. Credit card delinquencies and defaults are also rising. And for credit card issuers, that means tightening the reins a bit.

One way they do that? Reducing customers' credit limits. And even if you've had your card for years, paid on time and rarely carried a balance, your issuer could still slash your available credit with little or no not

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