Each renewal costs the consular application fee per person, plus the cost of assembling the business record; the investment does not have to increase, but it must remain substantial and at risk, and the business must stay non-marginal.
Fees per applicant; the investment stays, the proof updates
A visa renewal at a consulate carries the nonimmigrant visa application fee for each applicant, set by the State Department, so the wife, the husband and each child pay it, and the issuance follows the reciprocity schedule for Canadian nationals. If the couple instead extend status inside the United States, the Form I-129 filing fee on the USCIS fee schedule, Form G-1055, applies to the principal and a separate application fee to each dependant, with premium processing optional. The investment itself need not grow between renewals; the test is whether the capital originally committed remains at risk in the enterprise and whether the amount is still substantial relative to the business as it now exists.
A venue that has expanded, with a larger lease and more equipment, may find its original US$180,000 proportionally smaller and should document later reinvestment. Marginality is assessed on the business’s capacity to support more than the couple, so payroll for staff is both an operating cost and an item of evidence.