Deputy Premier Jackie Trad has referred herself to Queensland's crime watchdog over her purchase of a property in Woolloongabba.

News Corp last week reported Ms Trad had bought a $695,000 home along the route of Cross River Rail, a project for which she had ministerial responsibility.

Ms Trad and her husband signed the contract in late March, however, the property was not declared on the Queensland Parliament's register of members' interests within a month, as required.

In a statement released on Monday, Ms Trad said the matter needed to be "clearly resolved once and for all".