Premier League clubs are increasingly turning to domestic transfers as spending in the summer transfer window hits record highs. The average fee for players signed from another Premier League club reached £39.4 million, nearly double the £20.2 million spent on players coming from abroad. This trend, dubbed a "Premier League tax" by Kieran Maguire, a football finance professor at the University of Liverpool, shows a growing comfort among English clubs in trading with each other, even with rival teams. High-value transfers—those worth £40 million or more—have doubled in number compared to two years ago, rising from 13 in the 2024-25 season to 27 this summer. Domestic transfers have seen a significant increase, with the number of deals between Premier League clubs tripling from six to 18. In contrast, only nine such high-value transfers involved European clubs. The total amount spent on domestic transfers has also more than doubled, highlighting the growing internal market. Maguire noted that English clubs have become adept at scouting and developing overseas talent, creating a kind of "testing ground" for international players. This process benefits both the clubs and the players. A notable example is Carlos Baleba, who was signed by Brighton from Lille for £23 million and later sold to Manchester United for £70 million. Meanwhile, some of the most expensive transfers this summer were unique to the Premier League, such as Manchester City’s £75 million signing of Savio from Tottenham and Everton’s £65 million deal for Iliman Ndiaye. Trevor Watkins, a former Bournemouth chairman and current sports lawyer, pointed out that the Premier League operates in its own financial bubble, with revenues far outpacing other leagues. He noted that a significant amount of money flows between English clubs because they are the only ones willing to pay the high wages or transfer fees required. This has led to a more complex transfer market, where the profit made on transfers is often more critical than a player’s on-field performance. Under the Premier League’s new Squad Cost Ratio (SCR) rules, profits from transfers are averaged over three years, but the SCR is calculated over a single season, making it essential for clubs to secure high transfer fees to meet financial requirements. The 'Big Six' clubs—Arsenal, Chelsea, Liverpool, Manchester City, Manchester United, and Tottenham—spent £1.658 billion on players, largely supported by their strong commercial revenues. In contrast, the other 14 clubs spent £1.833 billion, relying more heavily on player trading. Clubs like Aston Villa and Newcastle managed to complete five high-value deals worth £40 million or more, but only after securing substantial funds from selling players. Meanwhile, Javier Gomez, La Liga’s corporate general director, criticized the Premier League’s "loss-making model," which he argues inflates fees and wages across Europe. Smaller clubs in Europe now find it difficult to compete with the financial power of even smaller English teams like Coventry and Brentford. As the Premier League’s transfer spending continues to rise, concerns about growing inequalities in European football are also increasing.