If you have credit-card debt, it just got a little more expensive.

The Federal Reserve on Wednesday raised its benchmark federal funds rate[1] by a quarter-percentage point — to a range between 1.75% and 2% — as many economists had expected. What consumers might not expect: Their credit-card bill is going up[2], too.

Consumers with credit-card debt will likely pay an additional $2.2 billion in interest payments annually, according to an analysis from the credit-card website CompareCards.com.

To determine that number, analysts at the site looked how much those carrying a balance pay in interest, based on the current average annual percentage rate (APR). They used a 15.32% APR as a base, which rose to 15.57% after the hike.

Cardholders currently have about $1 trillion in credit-card debt collectively, according to the Federal Reserve. Based on those numbers, CompareCards concluded they will collectively pay $2.2 billion more with a 25-basis point hike.

The Fed raises and lowers interest rates in an attempt to control inflation. When the Federal Reserve raises its rates, it’s costs more for banks to borrow money. And they typically pass on those costs to the consumer.

Credit-card interest rates are variable and tied to the prime rate[3], an index a few percentage points above the federal funds rate. It is a benchmark that banks use to set home equity lines of credit and credit-card rates. As federal funds rates rise, the prime rate does, too.

When the Fed rate goes up, consumers will typically see the impact within about 60 days. People with credit-card debt should consider trying to refinance or consolidate it now, or transfer it to a card with a lower interest rate.

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