The money was separate to the six-figure salary she earned as managing director of Special Olympics Europe/Eurasia.
P60s for the last three years showed her salary was €156,310 in 2010, €149,207 in 2009 and €138,167 in 2008.
Since 2000, she had been appointed to three state boards and a further three private-sector boards earning a total of €390,633 in board fees between then and this year.
The vast bulk of that sum — some €369,000 — came between 2004 and 2010, meaning she earned an average of €52,773 a year in fees for each of those years.
She earned €58,861 from the National Sports Campus Development Authority between 2000 and 2010, €86,693 from the Dublin Airport Authority between 2004 and 2009, and €36,529 from the Broadcasting Commission of Ireland between 2004 and 2009.
She earned €133,641 from ICS Building Society between 2004 and 2010, €18,750 from Bank of Ireland Mortgage Bank in 2010, and €55,158 from the Irish Times Trust between 2006 and 2011.
Ms Davis also said that over the course of her adult life, she had worked with 18 organisations in a voluntary capacity.
A few hours later, another Independent candidate, Seán Gallagher, released the details of his board memberships. He earned €41,150 in fees between 2008 and 2011, of which he gave €11,000 to charity.
He earned €30,150 between 2008 and July of this year from InterTradeIreland.
He received a fee of €11,000 for the year from Fás and donated it to charity, including Down Syndrome Ireland and the Irish Cancer Society.