A make-whole call is an issuer-friendly but investor-protective call provision. Unlike a traditional call (which pays par plus a small premium), a make-whole call requires the issuer to pay the net present value of all remaining coupons and principal, discounted at Treasury yield plus a spread (often 10-50 bps). This makes calling the bond expensive unless rates have risen substantially. Example: If a 5% bond has 10 years left and Treasuries are at 3%, the make-whole price might be 115-120 (well above par). Issuers use make-whole calls for M&A flexibility (they can refinance debt if they're acquired) without giving bondholders traditional call risk. Think of it as an expensive escape hatch: the issuer can call anytime, but they have to fully compensate you for the lost income stream. Make-whole bonds trade at tighter spreads than non-callable bonds because call risk is minimal.