relief u/s 89(1) may be calculating as follows :
supose: (MAXIMUM EXEMPTION LIMIT FOR THE ASSESSEE IS 1,50,000)
Salary received in F.Y 08-09: 5,00,000/-
Salary received in F.Y 07-08 2,50,000/-
and you received Rs 1,00,000/- as increasd salary pertaing to F.Y 07-08 which is not taxed in F.Y 07-08
now to compute relief follow the following steps:-
1. Compuete tax for F Y 08-09 on Rs 5,00,000/-
2. Compute tax for F.Y 08-09 on Rs 5,00,000/- and Rs 1,00,000/- i.e on Rs 6,00,000/-
3. Deduct tax as calculated in Step 2 from tax calculated in Step 1
Supose Tax in Step 1 = (15,000+20,000) 35,000
Tax in Step 2 = (15,000+30,000+30,000) 75,000
Step 2- Step 1 = 75,000-350,00 =35,000/-
4 Compute tax for F Y 07-08 on Rs 2,50,000/-
5. Compute tax for F.Y 07-08 on Rs 2,50,000 + Rs 1,00,000/- i.e total 3,50,000
6 Deduct tax as calculated in step 5 from tax calculated in step 4
Supose Tax in Step 4 = (10,000) 10,000
Tax in Step 5 = (15,000+10,000) 25,000
Step 5- Step 4 = 25,000-10,000 =15,000/-
7 Deduct Step 3 form Step 6
i.e 35,000-15,000 =20,000
20,000 /- shall be relief u/s 89(1)
if balance in step 7 show negative ( -ve) amount there is no need to claim relief