TAC TRANCHE
targeted amortization class (TAC) tranche
Bonds created in scheduled-pay CMO structures. A TAC tranche is structured to avoid prepayment volatility. Each TAC has a designated target speed. When prepayments exceed the targeted speed, the excess cash flow is diverted to other tranches in the CMO. Unlike a planned amortization class ( PAC) tranche, a TAC tranche is not protected from extension risk if prepayments are slower than expected. For this reason, TACs can be viewed as half PACs. TACs offer investors protection (but not immunity) from call risk but no protection from extension risk.American Banker Glossary