Rishi Sunak, who on Tuesday became the United Kingdom’s 57th Prime Minister, is one of the wealthiest people in Britain and this will be the first time that the residents of Downing Street will be richer than those of Buckingham palace.

The combined fortune of Sunak, former finance minister and investment banker, and his wife, Akshata Murthy, stands at around 730 million pounds ($830 million), more than the $500 million personal fortune of King Charles III, according to Forbes.

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This year, the Sunday Times Rich list ranked them 222 on the UK’s wealthiest 250 people list. In comparison, the estimated net worth of the late Queen Elizabeth was 370 million pounds ($420 million), the year’s list, published before the monarch’s death, showed. Sunak is said to be the richest man in the House of Commons.

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Murthy, 42, is the daughter of NR Narayan Murthy, the co-founder and retired chairman of Indian tech major Infosys, whose net worth is $4.2 billion. Her own 0.93% stake in the publicly traded software consulting firm is worth around $715 million, making up the major share of her and Sunak’s combined wealth, according to Forbes. She received $71 million in dividends from Infosys from 2015 to 2022, plus $17 million from share sales in December 2017.

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Akshata owns stakes in several other companies. She is the owner of capital and private equity firm Catamaran Ventures UK. Sunak also owned a 50% stake in the company but transferred his shares to Murthy in April 2015, shortly before entering parliament. She is also the director of gentleman’s outfitters New & Lingwood and the gym chain Digme Fitness.

Recently, Akshata Murthy’s tax arrangements were the subject of controversy. In April this year, she was accused of using her non-domicile status to save taxes and hide her foreign earnings from the British government. The couple had denied such allegations. However, later she agreed to start paying UK taxes on her overseas earnings.

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Sunak received 151,649 pounds as the Chancellor and is expected to be getting even more as the British Prime Minister. From 2001 to 2004, Sunak served as a partner at two highly profitable hedge funds. Prior to that, he worked as an analyst for the investment bank, Goldman Sachs. The new PM was a multi-millionaire in his early twenties, according to the Times report.

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The couple also has a personal real estate portfolio as they own four homes spread across the UK and California, worth an estimated $18.3 million. The biggest property in their collection is Manor House, a 19th-century, heritage-listed two-story countryside mansion in the village of Kirby Sigston in north Yorkshire, which they bought for $2.3 million in July 2015. In London, their primary residence is at 16 Hesper Mews in upscale Kensington, a four-bedroom house that they purchased for $17.1 million in 2010.