Indexing a long-term payment.

01 / Define the economic intent

A CPI-linked adjustment can translate a base payment into a payment expressed at a later price level. The parties must specify the scope and timing of that adjustment.

This preview offers a calculation pattern for review. Research index values are not ready to be incorporated as binding settlement references.

02 / Agree the complete specification

A robust agreement identifies more than the index name. Contract terms should be independently reviewed for the transaction and applicable law.

• The exact index, approved administrator, methodology version and base date.
• Base payment, payment currency, reference dates, time zone and adjustment frequency.
• Rounding order and precision, business-day treatment and payment deadlines.
• Publication cutoff, delayed data, corrections, disputes and cessation procedures.
• Whether decreases pass through. Any contractual floor or cap must be explicit and is not part of the IPU index.

03 / Illustrative drafting language

For discussion with counsel only. This is an incomplete example, not a ready-to-sign contract.

On each agreed Adjustment Date, the Base Payment shall be multiplied by the ratio of the approved IPU Index for the End Reference Date to the approved IPU Index for the Start Reference Date.

The parties shall separately identify the administrator, approved methodology version, reference dates, publication cutoff, rounding, correction policy, missing-data procedure and cessation fallback before execution.

04 / Test the economics

The calculator uses reconstructed history from the displayed dataset and methodology. It applies decimal arithmetic to five-decimal index values, then rounds the final amount half-up to cents. No floor or cap applies. Amounts stay in your browser. Download a JSON receipt to retain the dates, input indices, method version, dataset ID and rounding rule. The result is illustrative and creates no contractual obligation.