FTB-C000111 / Implementation concept

Return Base

Return base is the declared starting value, unit, and economic basis against which a return is measured.

Also known asreturn measurement basis

Intermediate 9 linked topicsPublished

Definitions

In plain terms

A return can change if you switch from unadjusted price to adjusted price, local currency to another currency, or price-only to total value.

Technical

The base contract includes instrument identity, valuation field, currency, adjustment state, distribution scope, timestamp, unit, and denominator validity.

Scope

It is not the same as the arbitrary display base value of an index.

Examples

  • A governed calculation records return base with its exact basis, effective time, source, and units.

Common misconceptions

  • Return Base does not have one universal treatment without the applicable methodology, event terms, and data context.

Concept relationships

Related

Where this concept is used

Tutorials planned

These catalogued topics use this concept, but their complete build has not shipped yet.

  • D02-F01-A01 Important
  • D02-F01-A02 Important
  • D02-F01-A04 Important
  • D02-F01-A05 Important
  • D02-F02-A01 Important
  • D02-F02-A02 Important
  • D02-F02-A03 Important
  • D02-F02-A05 Important
  • D03-F04-A01 Important

Evidence and governance

  1. Fintech Builder Glossary Definition Contract The Fintech Builder · internal governed contract

    Supports: preferred label, short definition, technical definition

    Limits: Defines governed platform behavior rather than claiming these policies are universally prescribed by external McClellan methodology.

Reviewed by
Last reviewed
2026-07-27
Next review
2027-07-27
Record status
published
Written by

Fintech engineer building market-data and financial systems, and the author of every article, glossary record, and reference implementation on The Fintech Builder.