You may finance the investment in Bulgaria with the exception of the (rarely utilized) investment in "managed portfolio account". With that in mind, we strongly advise against such practices as they are often being misused, which may lead to the citizenship application being declined.
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Can the investment for Bulgaria’s CBI program be financed or borrowed?
Can I borrow from banks or other financial institutions for my citizenship by investment application in Bulgaria? What if my parents or relatives want to lend funds to me?