Tax Slab calculation is wrong

Dear Consultants,

SAP system is calculating the tax on 363,900.00, after deduction of 2,00,00 slab as 0 tax the rest 1,63,900 it should show the 10% tax, but now system shows as 18,390.00. Hope the income tax slab it is considering 1,80000 as 0% tax, how i can check that information, In which table this information will store.

Please do needful.

Thanks & Regards,

Navesh