Last year the founder of online giant Amazon announced he was moving from his longtime home of Seattle back to Miami, where his parents live and where a base for his rocket company, Blue Origin, is also stationed.

But the move also comes with a lucrative silver lining: no state taxes.

In 2022, Washington State announced it would be introducing a 7% capital gains tax on sales of stocks or bonds of more than $250,000—a step change for the state, which doesn’t have any personal income tax.

For years Bezos had enjoyed selling some of his Amazon shares to fund various philanthropic efforts and new business ventures, or to make large personal purchases. But when the new tax levy came into play two years ago, Bezos paused his habit of selling Amazon shares—selling none in 2022 or 2023 according to CNBC calculations.

Although the capital gains tax didn’t stop Bezos gifting—he offloaded $200 million in shares as donations at the end of last year—he hasn’t simply sold stock for a number of years, until now.

In an SEC filing posted last week, Bezos revealed a scheduled stock-selling plan of 50 million Amazon shares, with Morgan Stanley acting as broker. According to the filing, the value of the stocks sits at $8.45 billion.

That came after an initial sale of 12 million shares worth an estimated $2 billion. On the first sale alone—where the shares were grouped into five blocks ranging between 1 million and 3.2 million—Bezos’s 7% tax cut (by moving out of Washington) would have saved him $140 million.

Looking at the wider sale, had Bezos stayed in Seattle he would have been on the hook for 7% of $8.45 billion, a figure of $591,500,000. Of course, now that Bezos and his fiancée, Lauren Sanchez, have moved to sunnier climes, the near-$600 million stays clear of the taxman.

That figure is subject to change, as a portion of the 50 million shares will be offloaded at some point in the future. That means Bezos’s payout—and associated savings—could go up or down. If the market is anything to go by, Bezos will only see the figures increase—after all, Amazon’s stock is up 73% over the past 12 months and 15% for the year to date.

What to spend it on?

Amazon could not immediately be reached when approached by Fortune for comment on whether the funds would be used for Bezos’s philanthropic efforts, for Blue Origin or other business endeavors, or for personal use.

Forbes estimates that in Bezos’s lifetime he has donated approximately $3 billion, or around 1.5% of his wealth, which Bloomberg estimates is $197 billion. His efforts have included giving $100 million to singer and entrepreneur Dolly Parton to donate as she sees fit, as well as pledging $100 million to the Maui wildfire crisis (though locals are perplexed as to where the funds are going).

Bezos’s four children also can’t expect to inherit his billions, with the tech titan revealing in 2022 he plans to give the vast majority of his wealth to charity.

But the billionaire has also had a few things on his own “to buy” list—first off, a home in his new state. In August Bloomberg reported Bezos had purchased a $68 million estate in Indian Creek, known as the “Billionaire’s Bunker.”

The man-made barrier island of Indian Creek forms part of the wider Miami area and counts Carl Icahn, Tom Brady, as well as Jared Kushner and Ivanka Trump among its residents.

In October Bezos also bought the property next to his initial home, spending $79 million on the seven-bedroom mansion, with sources familiar with the matter saying the entrepreneur is still open to other purchases in the area.

Bezos’s spending spree ramped up from 2020, when he purchased a nine-acre Beverly Hills mansion for $165 million, as well as a $78 million estate in Hawaii. To round out the shopping list, Bezos reportedly commissioned the build of one of the world’s most expensive superyachts, the Koru, which cost an estimated $500 million.