Well, you could quit paying it, but that would likely end as it did for Welsh club Llanelli, which no longer exists in Welsh football.
I would imagine if it's a tax on wages and operations, you can't, unless you quit selling tickets and paying your players. Depending on where you're managing, it's the cost of doing business.
Check back through the history of your expenses. You either have an income of about £50m per month every month - do you have a lot of player sales spread of x number of months? or you have it for the past 2 or 3 months during [probably] season ticket sales