You are not bound to keep your investment in the government bonds when it matures, however, this could affect your investor visa. Indeed, it is justified by a commitment with the Italian government so the withdrawal makes you not covered with general rules. Therefore visa will not be revoked until it expires, but with no investment made it will be very difficult to renew it and you will be able to keep the visa (obtained if you have met the initial 2-year retaining requirement for the government bond investment) only for the time been already granted.
