> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://biasinvestors.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Targeted Amortization Class (TAC)

A type of CMO tranche that provides protection from refinancing risk through the use of support tranches. These support tranches absorb prepayment in excess of a targeted amount up to a specified point where the TAC may experience a shorter maturity schedule.