Kushner, who is also a White House senior adviser, reported earning between $1 million and $7 million from Quail Ridge, a residential real estate company in Plainsboro, New Jersey. The amount was lower than what was reported in the previous year, new disclosures show.
The president's daughter and son-in-law had assets ranging between $278 million and $1.2 billion, according to the disclosures.
Ivanka Trump and her husband retained ownership of their personal businesses after the president took office and they took on new roles as White House advisers. Ethics experts and critics have raised concerns over potential conflicts of interest and possible influence from foreign entities.
The couple's income losses are the latest sign of troubles suffered by the family business under the Trump presidency.
For example, the Trump property in Doral - a major moneymaker for the company - has experienced an overall decline in revenue since Donald Trump took office, according to documents obtained by The Washington Post.
After the 2016 election, the president's eldest sons had planned two new lines of hotels, Scion and American Idea, in an effort to expand the family business and push into new markets that had voted for their father. But the plans have been halted.
Revenue at the Mar-a-Lago Club in Palm Beach, Florida, dropped 10 percent in 2018, The Post reported last month.
The couple also have at least $34 million in bank loans for their various businesses. During 2018, Kushner also reported that his business purchased three residential properties in Brooklyn worth $2.3 million and a hotel in Long Branch, New Jersey, worth at least $1 million.
Ivanka Trump, as she did in 2017, earned $6 million last year from her stake in the Trump International Hotel in Washington, a popular gathering spot for Republicans and those with business before the Trump administration.