Mr Robinson told the News Letter he had donated his salary to the party
The Electoral Commission is reviewing some donations the DUP should have reported, it has emerged.
The review follows an interview party leader Peter Robinson gave to the News Letter in June 2009.
In it, he was quoted as saying he had donated his first minister's salary to his party.
Political donations are regulated by the commission and ones over a certain amount must be reported by the party to the commission.
A spokesperson for the DUP said the party has not been contacted by the Electoral Commission.
News of the review comes at a time when Mr Robinson is under fire over his wife's financial dealings.
On Thursday, the BBC Spotlight programme revealed that his wife, Strangford MP Iris Robinson, obtained £50,000 from two property developers to help her 19-year-old lover set up a business.
It also said Mr Robinson did not tell the proper authorities when he discovered she had not registered the money.
It is understood that in this case the information about the donation of Mr Robinson's salary has so far not been given.
It is understood commission is not at the investigation stage.
A review is a process the commission goes through when it considers there may have been a breach of political parties election and referendums act.
Following the review the commission will have to decide whether to close the case or launch an investigation.