Nationals MP George Christensen has repaid more than $2000 for using taxpayers' money on domestic travel to link up with his personal overseas trips, after the independent expenses watchdog found he breached entitlement rules.

The Queensland MP self-referred his expenses to the Independent Parliamentary Expenses Authority at the height of last year's election campaign, after it was revealed he charged taxpayers more than $3000 to subsidise his frequent private trips to the Philippines.

Nationals MP George Christensen has repaid taxpayers almost $2000 after scrutiny over his international travel. Credit:Alex Ellinghausen

The audit found Mr Christensen breached travel allowance laws by claiming $261.82 on a domestic flight and a chauffeur-driven luxury car on March 30, 2018.

Mr Christensen voluntarily repaid an additional $1843.16 during the audit.