Tax computation in case of payment of salary arrears

Hi Experts,

I have a scenario wherein client wants that all the salary arrear that get's paid to employee in current financiial year should be taxed in the same year, can someone help me how to configure the same.

Ex:

Employee A - get's paid salary arrear in Oct 11 for a period of Oct 10 - Oct 11

Now how do i ensure that the tax on arrear get's incoporated in gross income for this year and tax get's computed accordingly.

Regards,

J