Kolkata Corporation charged Tax long before possesion taken

I bought a flat and started living from june-08(Agreement date is sept-07) as promoter given me possesion letter dated May-08. The promoter got completion certificate of the project from kolkata corporation dated March-08.

Now kolkata corporation asked me to pay Taxes since FY 05-06.

Now my question is why I should pay Taxes from 05-06?

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