Prince Harry is slated to receive a massive sum when he turns 40 in two months -- thanks to his late great-grandmother, Queen Elizabeth, the Queen Mother.

Before she passed away in 2002, the Queen Mother created a $90 million trust fund for her family, The Times U.K. reported.

According to the outlet, the late Queen Elizabeth II's mother stipulated that Prince Harry would be given his share of the trust when he reached 40 years old.

The Queen Mother reportedly allocated £14 million ($18 million) of the fund for the Duke of Sussex and his older brother Prince William.

Prince Harry and Prince William
Prince Harry and Prince William, left, follow the hearse with the coffin of Queen Elizabeth II moving towards St. George's Chapel on September 19, 2022 in Windsor, England. Getty Images/Jon Super - WPA Pool

But an unnamed insider told the Times that Prince Harry is expected to get a bigger cut than the Prince of Wales, who has a lot more income streams as the heir to the throne.

Prince Harry, who will celebrate his 40th birthday on Sept. 15, could get "slightly more than" £7 million ($9 million), the source claimed.

"William will benefit from the vast wealth of the Duchy of Cornwall, a private estate that funds the public, charitable, and private activities of the king's heir," the source said.

"As a result, Harry is likely to receive slightly more than half of the £14 million allocated for the brothers," the insider added.

2024 ESPY Awards - Arrivals
Prince Harry, Duke of Sussex accepts the Pat Tillman Award onstage during the 2024 ESPY Awards at Dolby Theatre on July 11, 2024 in Hollywood, California. Frazer Harrison/Getty Images

The latest Celebrity Net Worth estimate placed Prince Harry's current net worth at $60 million. Prince Williams' net worth is estimated to be around $100 million.

While most of the Prince of Wales' net worth comes from the duchy, a large chunk of Prince Harry's fortune is attributed to the inheritance Princess Diana left him and Prince William, which amounted to $10 million after taxes for each brother.

At 25, the Duke of Sussex and his older brother began receiving around $450,000 in dividends each year from investments made with their mother's fortune, Forbes reported.

They each got half of Princess Diana's fortune when they turned 30 -- along with her jewelry.

Prince Charles, Princess Diana, Prince William and Prince Harry
Princess Diana(L), her sons Harry(2nd L) and William(2nd R), and Prince Charles(R) watch the parade march past as part of the commemorations of VJ Day 19 August in London. JOHNNY EGGITT/AFP via Getty Images

Prince Harry grew his net worth after he and his wife Meghan Markle stepped back from royal duties and moved to California in 2020.

They signed lucrative deals with Netflix and Spotify.

Prince Harry also has a multi-book deal with Penguin Random House reportedly worth $35 to $40 million.

The first book from the deal, Prince Harry's bombshell memoir "Spare," was one of the bestselling books of 2023.

Insiders have suggested that the duke has likely earned around $27 million from the hardcover edition alone. "Spare" is also set to be released in paperback.

Prince Harry and Meghan Markle
Meghan, Duchess of Sussex, Prince Harry, Duke of Sussex meet with General Luigi Miglietta and NATO Joint Force Command and families from Italy and Netherlands during day five of the Invictus Games Düsseldorf 2023 on September 14, 2023 in Duesseldorf, Germany. Sascha Schuermann/Getty Images for the Invictus Games Foundation
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Prince Harry, Prince William