Call protection

An investor buying a 7% coupon for eight years is buying that income stream. Without protection the issuer would refinance the moment rates fell, returning the money exactly when it is hardest to reinvest at a similar yield.

The usual structure is a hard non call period, often three or four years, followed by a schedule of declining premiums: callable at par plus half the coupon, then a smaller premium, then par. Some bonds also permit an early equity claw allowing partial redemption from IPO proceeds.

This is the sharpest contrast with a leveraged loan, which is generally prepayable at par after a brief soft call window. It is a principal reason the two instruments attract different investors.

In a buyout it constrains the sponsor. Refinancing or a dividend recapitalisation may be economically attractive well before the bonds become callable, and the make whole cost of breaking through is often prohibitive.