Source : Webster's Revised Unabridged Dictionary (1913)

Repayable \Re*pay"a*ble\ (-?-b'l), a.
   Capable of being, or proper to be, repaid; due; as, a loan
   repayable in ten days; services repayable in kind.

Source : WordNet®

repayable
     adj : subject to repayment; "business loans are usually repayable
           in regular installments"