Portal Consolidation Tax

Portal Consolidation Tax is the hidden cost an agency accepts when it collapses CRM, project management, invoicing, and the client portal into one bundled system. Setup is fast and the client sees one branded login, but every future migration now carries the whole stack with it: contacts, invoices, approval history, and file permissions all move together or not at all. Standalone portals invert the trade: more integration work up front, cheaper to swap later. The framework asks one question before signing, which is what fraction of client-facing delivery would break if this vendor raised prices 30% next quarter. Forrester's November 2026 research on vendors controlling the meter, the gate, and the referee describes the same concentration risk, and it applies directly to agencies whose retainer work runs through a single bundled portal. Score each candidate on exit cost, not feature count.