A parliamentary watchdog has recommended that Ian Paisley be suspended from the House of Commons for 30 days.
It follows claims that he did not declare £100,000 in hospitality from the Sri Lankan government.
The Parliamentary Commissioner for Standards found the North Antrim MP had breached three Westminster rules.
Mr Paisley referred himself to the commissioner when the allegations first emerged in September 2017.
The claims first appeared in the Daily Telegraph.
The commissioner recommended that Mr Paisley be “suspended from the service of the House for a period of 30 sitting days starting on 4 September 2018”.
He has also been ordered to register any benefits he received from the Sri Lankan government.
The newspaper alleged the DUP MP and his family enjoyed two all-expenses paid holidays to Sri Lanka in 2013.
It claimed they flew business class and stayed in luxurious hotels.
It was estimated the trips cost about £100,000 and were paid for by the Sri Lankan government.
The newspaper went on to claim that Mr Paisley later met Sri Lankan officials to discuss post-Brexit trade deals.
The commissioner had been examining if Mr Paisley breached parliamentary rules in respect of the Register of Members’ Financial Interests.