US president Donald Trump paid $38m in tax on more than $150m income in 2005, according to a leaked partial tax return.
The two pages of tax return, revealed by US TV network MSNBC, also showed he declared $103m in losses.
It gave no details on income sources.
The White House said publishing the tax return was against the law.
Mr Trump refused to release his tax returns during the election campaign, breaking with a long-held tradition.
Correspondents say that, despite the lack of detail, the leak is still significant because so little is known about President Trump’s tax affairs and the new information could increase pressure on him to release more