Trump is worth about $5.5 billion less than his own estimates, according to Forbes. Presidential GOP front-runner Donald Trump isn’t as rich as he thinks. At least, that is according to Forbes’ magazine’s most recent issue slated to hit newsstands October. The Donald, as the outspoken real estate mogul’s former wife Ivana dubbed him, has pegged his net worth at around $10 billion. But according to its ranking of the wealthiest people in the U.S., Forbes is listing Trump’s riches at $4.5 billion.