The mortgage valued at $US5 million to $US25 million (($A7.3 - $A36 million) has a 4.5 per cent interest rate, according to the new filings. A real estate website lists the house, which is near the president's Mar-a-Lago beachfront estate and private club in Palm Beach, as being available for rent for about $US81,000 a month.
According to Palm Beach County public records, the loan is worth $US11.2 million.
The White House declined to comment on the filings.
The eight-bedroom house is more than 930 square metres. According to the Palm Beach Daily News, the president's two adult sons, Eric and Don Jr, bought the house last year for $US18.5 million from one of the president's older sisters.
The financial disclosures are mandated by law and offer a peek into the president's sprawling finances.
Unlike all other modern presidents, Trump refuses to release his tax returns, which would offer a clearer picture of how much money he is personally bringing in. The disclosures offer a glimpse of the number of properties he and his businesses own.
Last year in May, Trump's disclosure form made public for the first time that he repaid more than $US100,000 to former personal lawyer Michael Cohen, who had paid hush money to porn star Stormy Daniels about an affair she alleges to have had years before with the president.
Cohen was sentenced to three years in prison in December for his role in making illegal payments to women to help Trump's 2016 election campaign and lying to congress about a proposed Trump Tower project in Russia. Cohen reported to prison earlier this month.
The disclosure released in May 2018 also showed that Trump received more than $US25 million in income in 2017 from Mar-a-Lago and more than $US15 million in income from his golf club in Bedminster, New Jersey.
Trump spends time and vacations at both clubs and sells memberships to Mar-a-Lago. His continued ownership of the golf venues has been criticised by opponents, who say it blends personal and public business, allowing him to profit from the presidency.