Washington: Ivanka Trump and Jared Kushner may be working as unpaid White House advisers, but the couple isn't doing too badly with their side gigs, bringing in at least $US81 million ($106 million) of outside income.

The financial disclosures filed with the US Office of Government Ethics were released by the White House on a heavy news day, while the world's media lavished attention on President donald Trump's preparations to meet with North Korea's Kim Jong-un for talks over nuclear weapons.

The disclosures, issued late on Monday night, showed that Kushner, the President's son-in-law and a top White House aide, held assets totaling at least $US181 million. His previous disclosure filed in April 2017 had showed assets in at least the $US140 million range.

Kushner pulled in at least $US69 million in income last year, much of it from his own family's far-flung real estate empire, the financial disclosure forms showed.