The short answer
Dubai ownership costs sit in three layers: costs at purchase, recurring annual costs, and costs at exit. Service charges are a major recurring line, but management, cooling, insurance, vacancy and transfer-related costs also change the whole outcome.
At purchase
Keep a live acquisition-cost worksheet that includes all current DLD, registration, agency, mortgage and developer requirements relevant to the transaction. Rates and bands change, so confirm them directly with the responsible authority before relying on a figure.
Every year
Budget for the building's approved service charge, utilities and cooling where relevant, management, insurance and a realistic period between tenancies. A zero-vacancy model is a sales assumption, not an operating plan.
On exit
Agency, developer NOC, mortgage discharge and clearance of outstanding building charges affect net proceeds. Model them before listing, not after agreeing a sale price.
Information only. Rates, requirements and building records change. Confirm the current position with the responsible authority and the specific building documentation before relying on a decision.
Make the inputs visible