What is an index lease?

An index lease is a rental agreement where the rent is periodically adjusted based on changes in a specified economic index most commonly the Consumer Price Index (CPI) or the Wholesale Price Index (WPI). The rent moves up (or down) automatically in line with the index, without renegotiation.

How It Works

  • Base rent is set at the start of the lease.
  • At each review period (annually or every 3 years), rent is adjusted proportionally to the change in the reference index.
  • Formula: New Rent = Base Rent x (New Index Value / Base Index Value).

Advantages

  • For landlords: Rent keeps pace with inflation automatically.
  • For tenants: Rent increases are transparent, predictable, and tied to economic realities rather than arbitrary landlord demands.

Index leases are an elegant solution to the rent revision problem in long-term commercial leases. They eliminate the need for periodic renegotiation a process that can create uncertainty and friction for both parties by anchoring adjustments to an objective, publicly published economic indicator.

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