Theresa May has published her tax returns for the last four financial years in a move that will put pressure on rival Andrea Leadsom to follow suit.
The energy minister is the only remaining candidate in the Tory leadership contest who has not made their return public.
Mrs May's statement showed she paid £40,023 in income tax in 2014/15.
She earned £112,426 from her MP's and Home Secretary's salaries and a further £6,036 in interest and dividends.
Her total taxable income was £117,350 after taking her reduced personal allowance into account.
The Home Secretary declared £5,033 in net capital gains and £685 in charitable donations.
Between 2011 and 2014 she paid £126,679 in income tax on £375,343 of earnings.
Justice Secretary Michael Gove published his returns after launching his leadership bid. It showed he paid nearly £70,000 tax in the two years up to April 2015.
His income in 2013/14 when he was education secretary was £117,786 and his high salary meant his personal allowance was reduced to £547, according to the documents.
Mrs Leadsom's campaign manager, Tim Loughton MP, told the BBC she would publish her tax return "as soon as she gets time away from speaking to colleagues and fighting this campaign".