All bills are paid by the Sovereign Grant, a grant "provided by Government to the Royal Household in support of the Queen's official duties," according to the royal family's official website. The grant comes from the treasury and is funded by taxpayers, according to the BBC.
The grant also covers the maintenance and upkeep of the royal family's residences, as well as the salaries of employees who work for the royal family.
Though the Queen is not legally required to pay taxes, she makes voluntary payments on income, assets, and gains not used for official purposes, Insider previously reported.
Other parts of the royal family's income, like the Prince of Wales' income from the Duchy of Cornwall, are also exempt from taxes, however, again, he "voluntarily pays income tax on all revenue from the estate," according to his website.