A redemption premium refers to the amount that an issuer must pay if they decide to repay a bond or other debt before it matures. However, there are several other terms that can be used in place of redemption premium, including yield to call or prepayment penalty. Yield to call refers to the yield or return that an investor receives if a bond is called before it reaches maturity. On the other hand, a prepayment penalty is a fee charged by lenders or borrowers if they pay off a loan before its scheduled maturity date. Ultimately, all of these terms refer to the cost of early repayment of debt.