The Chairman of Empowered Committee of State Finance Ministers, Sushil Modi on Saturday said the Centre will have to adopt a flexible approach to ensure timely implementation of the Good and Services Tax.He told reporters after the meeting of state finance ministers that Centre proposes to introduce Goods and Services Tax (GST), which will subsume central and state taxes like excise, customs, service tax, sales tax and VAT, by April 1, 2012. The introduction has been pending for years in the absence of political consensus.Asked whether it would be possible to introduce the new tax regime from April 1, 2012, Modi said that he was optimistic given the way things are proceeding now. He said the committee will meet again in the last week of September or the first week of October to discuss the Constitution Amendment Bill, which is lying with the Parliamentary Standing Committee on Finance.