Carlos Alcaraz secured his fifth Grand Slam title on Sunday after defeating world number one Jannik Sinner in an exhausting French Open final that stretched nearly five and a half hours at Roland-Garros.
The 22-year-old Spaniard's triumph earned him €2.55 million (£2.13 million) in prize money.
However, the young champion faces a significant financial hit due to French taxation laws.
Reports suggest that approximately 30 per cent of his winnings could be claimed by the French tax authorities, potentially costing Alcaraz around £639,000 of his hard-earned prize money.
Carlos Alcaraz fell to the floor after his historic victoryReutersThe taxation system for professional tennis players operates differently from many other sports.
According to My Tennis HQ: "The amount of tax money a tennis player will pay on prize money will depend exclusively on the location where the money was earned, made, or received."
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This means that when players compete at Wimbledon, they face UK taxation laws, whilst the French Open subjects them to French tax regulations, regardless of their nationality.
"After the players pay taxes to the local government where the prize money was earned, they do not have to pay income tax on it again when they return back home," the publication explains.
With the French Open taking place in France, the country's taxation laws apply to all prize money earned at Roland-Garros.
Whilst exact figures remain difficult to confirm, estimates suggest that Alcaraz will lose approximately 30 per cent of his £2.13 million winnings to French tax authorities.
This would amount to roughly £639,000 being deducted from the champion's prize money. Runner-up Sinner faces a similar percentage loss on his €1.28 million (£1.07 million) earnings from the tournament.
The substantial tax bill means that despite his impressive victory, Alcaraz will take home significantly less than the headline prize money figure suggests.
Despite the hefty tax bill, Alcaraz has revealed how he rewards himself following major victories.
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Carlos Alcaraz has now won five Grand Slams following his sensational French Open final win over Jannik SinnerGETTYSpeaking to the Tennis Channel before the tournament, the 22-year-old shared his post-triumph shopping habits.
"Maybe not after every big win, but for example, at the Grand Slams, if I reach the semi-finals, I like to buy myself a new pair of sneakers," Alcaraz explained.
The Spanish star also disclosed his end-of-year indulgence: "If I feel like I had a good season, at the end of the year I'll buy myself a nice watch."
These modest rewards pale in comparison to the £639,000 he stands to lose in French taxes.
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