Work out fsi premium cost instantly with clear inputs, formula shown and shareable results.
Many jurisdictions allow additional floor space index to be purchased from the planning authority at a premium rate linked to land value. The premium is normally taxable, so the effective cost per square metre is well above the notified rate, and it must be compared against the sale value of the extra area to see whether buying FSI is worthwhile.
FSI premium
Total = additional area x premium rate x (1 + tax rate)
Preliminary estimate only. Premium FSI rates, eligibility and taxation vary by jurisdiction and must be confirmed with the planning authority.
Total = additional area x premium rate x (1 + tax rate). Many jurisdictions allow additional floor space index to be purchased from the planning authority at a premium rate linked to land value.
When the premium plus construction cost approaches the achievable sale rate. In weaker markets the premium can exceed the marginal value of the extra area.
This calculator takes 3 inputs: Additional built-up area purchased, Premium rate, Tax on the premium. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.