Kisan Vikas Patra Tax Rules: Post Office's Kisan Vikas Patra (KVP) is a scheme in which your investment is guaranteed to be doubled. In this scheme of the post office, which is being run in the name of farmers, your money gets doubled on maturity. At present, the annual interest on this scheme is 7.5 percent, which is equal to the 5 year FD i.e. time deposit scheme of the post office. But it also has disadvantages compared to investing in FD. You should also know about its advantages and disadvantages before investing in this scheme.