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pro tanto

Latin · proh TAN-toh · Latin maxims and phrases

Meaning. To that extent; only so far as it goes.

Something operates pro tanto when it has effect only to a limited extent rather than wholly. A statute repealed pro tanto is repealed only to the extent of the inconsistent part. A pre-Constitution law inconsistent with fundamental rights is void under Article 13 only to the extent of the inconsistency; under Article 254 a State law repugnant to a Central law is void to the extent of the repugnancy. A payment pro tanto discharges a debt to the amount paid.

It is related to the doctrine of severability: the valid part survives if it can stand on its own. Do not confuse it with pro rata (proportionately).

Example

The State law was void pro tanto, only to the extent it conflicted with the Central Act, and the rest of it remained in force.

In Indian law

  • Articles 13 and 254, Constitution of India

See also

doctrine of severability · repugnancy · pro rata · repeal

Read more in the study notes

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