Offer your insights or judgment on the input financial query or topic using your financial expertise. Reply as normal question answering

Can a credit card company raise my rates for making a large payment?
No. Credit card companies will typically not care about your individual credit card account. Instead they look either at a "package" of card accounts opened at roughly the same time, or of "slices" of cardholder accounts by credit rating. If an entire package's or slice's balance drops significantly, they'll take a look, and will adjust rates accordingly (often they may actually decrease rates as an incentive to increase you use of the card). Because credit card debt is unstructured debt, the bank cannot impose an "early payment penalty" of any kind (there's no schedule for paying it off, so there's no way to prove that they're missing out on $X in interest because you paid early). Generally, banks don't like CC debt anyway; it's very risky debt, and they often end up writing large balances off for pennies on the dollar. So, when you pay down your balance by a significant amount, the banks breathe a sigh of relief. The real money, the stable money, is in the usage fees; every time you swipe your card, the business who accepted it owes the credit card company 3% of your purchase, and sometimes more.