def income_tax(pre_tax_income):
    """
    Returns the total amount of tax at a rate of 35% in any amount over the free tax allowance of 11000£
    :param pre_tax_income: The yearly income before tax.
    :return: The amount of tax to be paid.
    """
    tax_allowance = 11000
    tax_rate = 0.35

    # Calculate the tax to be paid on the taxable income that is greater than the free tax allowance.
    if pre_tax_income <= tax_allowance:
        return 0
    else:
        return (pre_tax_income - tax_allowance) * tax_rate