The Charity Commission for Northern Ireland has been given jurisdiction over all Northern Ireland organisations that have registered with HM Revenue & Customs for charitable tax purposes.
The commission said in a statement that a transitional provision order, which came into effect on Monday, increased the number of charities over which it had powers.
The commission previously had jurisdiction, including the power to investigate apparent charity misconduct and mismanagement, over a deemed list of about 6,500 charities registered with HMRC. The list was created on 18 February 2011.
The new order means that the commission has jurisdiction over all organisations that had registered with HMRC for charitable tax purposes as of 19 August 2013.
A spokeswoman for the commission said it did not yet know how many charities would be included on the new deemed list because it was still liaising on its composition with HMRC.
Frances McCandless, chief executive of the commission, said in a statement: "This has been a very busy year for the commission as we continue to prepare for beginning full charity registration in the autumn, along with our ongoing regulatory and compliance work.
"We are delighted the transitional provision order has been made, allowing us to go ahead and make decisions on a wide range of areas, from giving consent to governing documents and granting cy-près schemes, as well as increasing the number of charities to which our powers apply."
The commission, which will begin registering charities later this year, will now talk to HMRC to create a new, up-to-date deemed list, which will be published on the commission’s website.