National Party Leader John Key has unveiled an economic management plan that will provide a much-needed boost to weekly superannuation payments. 

Mr Key says National is determined to lift the incomes and living standards of all New Zealanders, and today's announcement fulfils a pledge he made at the party's annual conference in August.

"I'm also repeating the other pledges I made then.

"National will retain all the superannuation entitlements and eligibility rules that our senior citizens currently enjoy. We will keep this pledge and I will resign as Prime Minister, and as a member of our Parliament, rather than break it.

Mr Key says the pre-election opening of the books has been fully considered.