Protection of pension rights
Section 173 · 1999 Constitution (2004 edition)
What Constitution says
(1) Subject to the provisions of this Constitution, the right of a person in the public service of the Federation to receive pension or gratuity shall be regulated by law. (2) Any benefit to which a person is entitled in accordance with or under such law as is referred to in subsection (1) of this section shall not be withheld or altered to his disadvantage except to such extent as is permissible under any law, including the Code of Conduct. (3) Pensions shall be reviewed every five years or together with any Federal civil service salary reviews, whichever is earlier. (4) Pensions in respect of service in the public service of the Federation shall not be taxed.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 81–82. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections