Conservative coalition MP Kevin Andrews drew on his taxpayer-funded "study allowance" when he travelled to the United States to attend a prayer breakfast and address a right-wing think tank.

The Victorian backbencher skipped a week of parliament to participate in the 64th annual National Prayer Breakfast and deliver a speech at the influential Heritage Foundation in Washington DC last February.

The former minister says he paid for most of the trip himself but records show he also drew $1855 from his study entitlement.

Mr Andrews was one of the last MPs to draw on the controversial allowance, which was finally phased out last year.