• Tax treatment for sale of property before registration

Hello! 

I & my wife entered in an "Agreement to Sell" for a specific flat with a builder in 2004, we took a bank loan and paid 95% of the sale consideration (self contribution + bank) before 2006. The property was to be fully constructed and handed over by 2006. However, the builder could not complete the construction. Over the years, we paid 2 other builders to get it constructed. The property finally became available in 2016. We also had to spend a substantial sum for fixing & renovation since 2016, and have had to pay bank interest since 2004 towards the loan. I moved to the US in 2015 as a student and my wife joined me too. We have not visited India since Aug 2016 and hence have not had an opportunity to register the property in our names. But we wish to now transfer the property to a willing buyer. What tax benefits will we be eligible for? What kind of tax treatment will the property sale attract? What TDS will the buyer have to deduct?