The Queen of England is not as rich as people think.

Today is the day Queen Elizabeth II of England turns 90 years old, and she will celebrate her birthday at the oldest and largest castle in the world - Windsor.

This is just one of nine residences owned by the Queen. Each one is home to priceless art collections and some of the world's most expensive jewelry.

However, the queen herself is not as rich as people think. In fact, most of the royal treasures are not her property.

The Queen's personal fortune, according to the Sunday Times, is around £340 million ($490 million), a small figure compared to the world's richest people.

Queen Elizabeth II has an annual income of more than 50 million pounds. Photo: Detroit News

The richest woman in the world, according to Forbes, is Liliane Bettencourt with $40 billion, who owns 33% of L'Oreal. The richest person in the UK is Gerald Grosvenor, the Duke of Westminster, with $12.9 billion. The Queen even dropped out of the top 300 richest people in the UK last year.

She currently has three sources of funding. These are the Sovereign Grant, the Privy Purse and her personal income.

1. Sovereign Grant: £37.9 million

The Sovereign Grant covers the Queen's expenses, such as travel, security, castle maintenance and staff salaries. Last year, it was £37.9 million ($55 million). The Queen spent £35.7 million. The surplus goes into a reserve fund.

This is a fixed amount of 15% of the profits from the Crown Estate - the UK's national estate management company. They are responsible for royal castles, farms, entire streets of London and even some of the UK's seabed.

Although the Queen is the legal owner of these properties, they do not belong to her personally. And of course, she has no right to sell any of them.

2. Basic income: £16 million

If the Queen were a normal job, the Privy Purse would be her basic salary. Last year, it was around £16 million – the highest ever. It comes from the Duchy of Lancaster – the Queen’s private estate, which includes residential, commercial and agricultural properties.

The Queen uses this money to pay for her personal expenses. It also includes costs incurred by other members of the royal family carrying out official duties on her behalf.

3. Personal wealth: estimated £340 million

The Queen inherited Balmoral Castle in Scotland and Sandringham Estate in the east of England from her father. She also has a valuable stamp collection and many works of art.

The Queen is not required to disclose her personal investments. However, British media reports say she has stakes in several major British companies. And the Queen’s investment portfolio is “fairly conservative.”

Until 1992, the Queen paid no tax. But since 1993, she has had to pay income tax and capital gains tax as normal. Part of the Basic Income is taxable. The Sovereign Grant is not.

According to VNE