Output at factories, utilities and mines grew 9.8 percent on year, its fastest pace since October 2010, compared with a 7.8 percent expansion forecast by analysts in a poll and sharply higher than an upward revised figure of 3.8 percent growth in September.

While the October output figures were bolstered by a favourable statistical base, double-digit growth in the manufacturing sector points to a strengthening industrial recovery. Soumya Kanti Ghosh, chief economic advisor at State Bank of India, said Friday's data was likely to push overall economic growth for the year ending in March 2016 above 7.5 percent.

India's economy expanded at an annual rate of 7.4 percent in the July-September quarter, outpacing China's economic growth. "The base effect has played a role, but there is also a sequential momentum for manufacturing driving the index of industrial production, which is a good sign," Ghosh said.

Still, investors are worried about a persistent logjam in parliament that has hurt expectations for the early passage of a new sales tax. Aimed at creating a customs union for India's 1.2 billion people, the Goods and Service Tax (GST) is the biggest revenue shake-up since independence from Britain in 1947.

Supporters say it will add up to two percentage points to economic growth by replacing multiple federal and state tax levies, a chaotic structure that inflates costs for businesses.

POLITICAL SLUGFEST, STRUCTURAL HEADWINDS

Widely considered a low-hanging reform measure, the tax bill has now become a victim of a battle between Prime Minister Narendra Modi's Bharatiya Janata Party (BJP) and the opposition Congress. India's NSE index closed nearly 1 percent lower on Friday to hit a three-month low.

While Asia's third-largest economy has emerged as the world's fastest growing major economy, it's still not firing on all cylinders. Much of the steam comes from public spending rather than private investment. A lasting industrial recovery is less likely without fixing structural bottlenecks such as the domestic tax system, reckoned Shilan Shah, an economist at Capital Economics.

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