The official page describes a nonrefundable processing fee and a gift per person, with corporate sponsorship on different terms. Consultant fees, legal fees and tax consequences sit on top. Confirm current figures on the official page on the day you decide.
Add it up per person, then add what the page does not list
The official program description sets a processing fee and a gift amount for the principal and separate amounts for each accompanying spouse and child, and describes a distinct corporate track with its own figures. A Boischatel household should total those per person from the official page as it reads on the day, because the figures are the program's, not a consultant's, and they may be revised. On top of that sit professional fees for immigration advice, any intermediary's charge, translation of Québec civil documents, and the cost of the tax and financial advice a gift of this size warrants.
Hypothetical example: a clinic owner comparing the Gold Card with EB-5 notes that EB-5 capital may return if the project succeeds while the gift never does, so the effective cost is the whole amount, plus any Canadian departure-tax consequences of relocating. The processing fee is described as nonrefundable; ask what refund, if any, applies to a gift where the application ultimately fails.