1) as per the current income-tax rules, long-term capital gains on sale of a property held for three years, attracts 20 per cent tax.
2) Date of purchase of the house for the purpose of claim-ing deduction u/s.54 would be the date on which the assessee takes possession of the house and not the date of registration of the sale deed. CIT v. R. L. Sood, (2000) 245 ITR 727 (Del.)
3) in your case agreement for purchase of house was done in 2004 payment was made by you in in 2004, possession granted in 2004 hence sale would attract long term capital gains tax