National Party MP Claudette Hauiti has given up her parliamentary charge card after she used it to pay for a personal trip to Australia.
"I went to Australia. It was travel only and way outside Parliamentary Service guidelines," she told Fairfax Media.
She said the trip over Christmas last year and other questionable spending, including refreshments for a hui on a marae, had cost about $200, which she has since repaid.
"Of course it's absolutely no excuse for not knowing the Speaker's rulings. It is my responsibility and I didn't do it."
Parliamentary Service refused to provide a total of unauthorised spending, or comment on the matter.