Provided, The veteran certifies, in such form as the Secretary may prescribe, that he or she has paid in cash from his or her own resources on account of such purchase, construction, alteration, repair, or improvement a sum equal to the difference, if any, between the purchase price or cost of the property and its reasonable value.
38 C.F.R. §36.4519
Authority: 38 U.S.C. 3711(b)