It depends on your situation. A holdco is useful for creditor-proofing retained earnings, tax-deferred compounding, and — within limits — income splitting. Since 2018 the tax on split income rules tax dividends to adult family members at the top marginal rate unless a narrow exception applies, and the excluded-shares exception is not available for holdco shares or shares held through a trust. A holdco also adds compliance cost, complicates your LCGE eligibility if structured poorly, and is not necessary for every owner. The decision turns on your retained earnings, tax rate differential, and long-term exit plan.