38 CFR § 1.914 - Collection in installments.
(a) Whenever feasible, VA shall collect the total amount of a debt in one lump sum. If a debtor is financially unable to pay a debt in one lump sum, VA may accept payment in regular installments. VA should obtain financial statements from debtors who represent that they are unable to pay in one lump sum and independently verify such representations whenever possible. If VA agrees to accept payments in regular installments, VA should obtain a legally enforceable written agreement from the debtor that specifies all of the terms of the arrangement and contains a provision accelerating the debt in the event of default.
(b) The size and frequency of installment payments should bear a reasonable relation to the size of the debt and the debtor's ability to pay. If possible, the installment payments should be sufficient in size and frequency to liquidate the debt in 3 years or less.
(c) Security for deferred payments should be obtained in appropriate cases. However, VA may accept installment payments if the debtor refuses to execute a written agreement or to give security.