What is the highest interest loan rate one can get?

Loan rates can change on a daily basis, sometimes in line with the 'Bank Base Rate' (BBR). There is no cap or law on the loan rates that a loan company may offer. Higher interest rates tend to be geared towards higher risk consumers with low credit scores. Banks usually offer rates around the 10-20% range, whereas payday loan companies will offer on average around 4500%+.