Ask any parent and they'll no doubt roll their eyes over the seemingly never-ending expense that are school fees.
Ahead of Prince George returning and Princess Charlotte commencing primary school at Thomas's Battersea in West London, we now know how much the Duke and Duchess of Cambridge are forking out for their children's education.
According to a report from HELLO!, parents with children attending the private are expected to pay £18,915-per year, that's around AUD$34,308. However, prices differ depending on the child's birth order.
Four year-old Princess Charlotte's school fees will be nearly two per cent lower than that of her older brother George's. Currently, the school's term fee for the eldest child of the Reception (kindergarten) and Year Two tier is £6,429 (AUD$11,660), while the second child's fee is £6,305 (AUD$11,435).
Should little Prince Louis attend the same school as his siblings when he is of age, the fee drops slightly more for for the third child is £5,790 (AUD$10,501).
According to the latest data from the Australian Scholarships Group, the average median cost of a government education over a 13-year period in metropolitan Australia is $68,727.
It seems like the four year-old princess can't wait to join her big brother at Thomas's Battersea, with a source revealing to PEOPLE just how much.
"She can't wait to be with George at big school," the insider told the publication.
"She is so excited about it all."
The school's headmaster Simon O'Malley, also said in a statement: "We are delighted that the Duke and Duchess of Cambridge have decided that Princess Charlotte will join her elder brother, Prince George, at Thomas's Battersea. We greatly look forward to welcoming her and all of our new pupils to the school in September."
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Prince George started school in 2017 and while Prince William escorted him on his first day, Duchess Catherine was unable to attend as she was suffering from hyperemesis gravidarum during her pregnancy with Prince Louis.
However, due to their similar age and the fact that they spend so much time together, George will no doubt be looking out for his little sister.