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UPDATE 5-India cuts corporate taxes to boost manufacturing and revive growth

* Effective tax rate cut to about 25% - Finance Minister

* Equity markets post biggest intraday rise in over a decade

* Tax revenue loss from lower rates seen at $20.4 bln

* Bond yields rise on concern government may borrow more (Adds details on tax cuts)

By Manoj Kumar

PANAJI, India, Sept 20 (Reuters) - India cut corporate tax rates on Friday in a surprise move designed to woo manufacturers, revive private investment and lift growth from a six-year low that has led to major job losses and fueled discontent in the countryside.

Prime Minister Narendra Modi, under pressure to make good on a promise to deliver growth and tens of thousands of jobs, said the lower tax rates would spur new investment and drive his "Make In India" plan to boost domestic manufacturing.

"The step to cut corporate tax is historic. It will give a great stimulus to #MakeInIndia, attract private investment from across the globe, improve competitiveness of our private sector, create more jobs and result in a win-win for 1.3 billion Indians," Modi said on Twitter.

The cut in the headline corporate tax rate to 22% from 30% was widely cheered by Indian equity markets. The benchmark index posted its biggest intraday gain in more than a decade to end more than 5% higher.

"The measures announced by the finance minister this morning can be described as a 'New Deal' for the Indian economy," said VK Vijayakumar, chief investment strategist at Geojit Financial Services. "The psychological stimulus from this ... will be higher than the fiscal stimulus."

Modi is headed to the United States this weekend where he will showcase India as an attractive destination for investment at a rally organised by Indian-Americans which U.S. President Donald Trump is set to attend.

Modi is also due to discuss investment opportunities with executives from U.S. bank JPMorgan Chase, aerospace company Lockheed Martin Mastercard and the world's biggest retailer Walmart.

The new corporate tax rate for domestic companies, excluding surcharges, makes India more competitive than neighbouring Bangladesh and puts it almost on par with Vietnam and Thailand, countries that have wooed businesses affected by the U.S.-China trade dispute.

"The move will make Indian companies globally competitive, and allow global companies a good option for growing their manufacturing base in-country," said Mukesh Aghi, president of the U.S.-India Strategic Partnership Forum.

'VERY BOLD'

Finance Minister Nirmala Sitharaman said India's effective corporate tax rate would be lowered to about 25%.