Interest calculation

I suggest you fill ITR1 in all respects. Click Calculate tax. you  will get the Tax with interest under 234A,B and C pay around 100 or 150 more. Refunds below 100 will not given.

You should do what mr kiran had told. Only thing is you will have to fill the IT sheet [advance/self assesment column ] with some ficticious fig. 

1] Taxable Income is 423420  ,

2] Tax payable is (423420- 250000) *0.1 =17342

3] less max rebate of Rs 2000 under 87A  so  17342 -2000 =15342  

4] add 3% edu cess so 15342*0.03  =460

5]  Total tax payable w/o int  = 15802 

6] Add int of 1.5% per month since amt greater than 10000.

7] Add some fig in adv rax/ self assesment tax  say  17500

8] click Calculate tax - if less increase the fig in self assesment tax sheet untill you get refund of rs 150-200.

I hope i am correct

Advance tax for person other than companies is payable if tax due in a financial year is more than 10000 before the TDS amount .Such person have to pay advance tax in three installments.
 

1. 30% of tax assessed =15 September of previous year(for Ay 2015-16date is 15.09.2014)
2. 60% of tax assessed=15 December of previous year ( For  Ay 2015-16  Date is 15.12.2014
3. 100% of tax assessed = 15 March of previous year (For  Ay 2015-16  date is 15.03.2015)