There was the time Donald J. Trump told Larry King that he had been paid more than $1 million to give a speech about his business acumen when in fact he was paid $400,000. Or the time he sought a bank loan claiming a net worth of $3.5 billion in 2004, four times as much as what the bank found when it checked his math. Or the time he boasted that membership to Trump National Golf Club in Westchester County, N.Y., cost $300,000 when the actual initiation fee was $200,000. Or the time he bragged on CNBC about his new Trump International Hotel and Tower in Las Vegas, claiming, “We have 1,282 units, and they sold out in less than a week.” As Mr. Trump knew, more than 300 units had not been sold.

Confronted in a court case about this last untruth, Mr. Trump was anything but chagrined. “I’m talking to a television station,” he said. “We do want to put the best spin on the property.”

As Mr. Trump prepares to claim the Republican nomination for president this week, he and his supporters are sure to laud his main calling card — his long, operatic record as a swaggering business tycoon. And without question, there will be successes aplenty to highlight, from his gleaming golden high-rises to his well-regarded golf resorts, hit TV shows and best-selling books.

But a survey of Mr. Trump’s four decades of wheeling and dealing also reveals an equally operatic record of dissembling and deception, some of it unabashedly confirmed by Mr. Trump himself, who nearly 30 years ago first extolled the business advantages of “truthful hyperbole.” Indeed, based on the mountain of court records churned out over the span of Mr. Trump’s career, it is hard to find a project he touched that did not produce allegations of broken promises, blatant lies or outright fraud.