Real estate billionaire Donald Trump has been collecting a state property-tax break for people who make $500,000 or less,The GOP presidential front-runner qualified for the New York state School Tax Relief Program, which offers about a $300 annual benefit, on the latest property-tax bill for his Trump Tower penthouse on Fifth Avenue, Crain's reports.To qualify for the tax break, a married couple's annual income must be $500,000 or less.According to records with the city's Department of Finance, Trump got a $302 Star benefit on his latest property-tax bill, Crain's reports.Property-tax expert and former New York City Finance Commissioner Martha Stark tells the business newspaper it was "interesting" Trump received the program benefit.But Trump's campaign manager, Corey Lewandowski, tells Crain's the tax benefit was "an error on the part of the city of New York" and that Trump received it over the past three years even though he hadn't asked for it since 2009, when tax authorities began checking applicants' income.Trump released a financial statement last June that said his net worth was $8.7 billion. A month later,his net worth was "in excess of ten billion dollars."Trump's annual property-tax bill came to $175,544, but also was reduced $37,236 through a city abatement program for which many co-op and condo owners qualify, Crain's reports.