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The English version of the Treaty appeared as a schedule to the Waitangi Day Act 1960, but this did not technically make it a part of statute law. The Treaty of Waitangi Act 1975 established the Waitangi Tribunal, but this initially had very limited powers. The Act was amended in 1985 to increase the Tribunal membership and enable it to investigate Treaty breaches back to 1840. The membership was further increased in another amendment, in 1988.

Although the Treaty has never been incorporated into New Zealand municipal law, its provisions were first incorporated into legislation as early as the Land Claims Ordinance 1841 and the Native Rights Act 1865. Later the Treaty was incorporated into New Zealand law in the State Owned Enterprises Act 1986. Section 9 of the Act said that nothing in the Act permitted the Crown to act in a manner that is inconsistent with the principles of the Treaty of Waitangi. This allowed the courts to consider the Crown's actions in terms of compliance with the Treaty (see below, "The Principles of the Treaty"). Contemporary legislation has followed suit, giving the Treaty an increased legal importance.

The Bill of Rights White Paper proposed that the Treaty be entrenched in the New Zealand Bill of Rights Act 1990, however this proposal was never carried through to the legislation, with many Māori being concerned that this would relegate the Treaty to a lesser position, and enable the electorate (who under the original Bill of Rights would be able to repeal certain sections by referendum) to remove the Treaty from the Bill of Rights altogether.

In response to a backlash against the Treaty, politician Winston Peters the 13th Deputy Prime Minister of New Zealand (and founder of the New Zealand First Party) and others have campaigned to remove vague references to the Treaty from New Zealand law, although the New Zealand Māori Council case of 1990 indicated that even if this does happen, the Treaty may still be legally relevant.