Stack Overlap Tax

Stack Overlap Tax is the cumulative cost of paying twice for capabilities a client already owns. Every e-commerce stack accumulates duplicate function: a support concierge bundled inside a CX platform, a cart recovery module inside a WordPress plugin, a recommendation engine inside a hosting plan. The tax is not the subscription line item alone. It is the integration labor, the reconciliation of two data models, and the reporting ambiguity when two dashboards disagree on the same conversion number. Agencies absorb most of that tax because the retainer is fixed while the reconciliation work is not. A concrete pattern: a merchant running WooCommerce with a separate subscriptions plugin and a separate affiliate tool can consolidate onto SureCart, which folds subscriptions, payments, and affiliate management into one plugin. Before renewing any client stack, map every paid capability to the platform that already ships it. The savings fund the integration work that actually differentiates the agency.