UPDATE 1-SocGen quarterly profit plunges although results top expectations

* SocGen says Q4 net income down 82.3 pct

* French, U.S. tax changes and restructuring costs weigh

* Q4 revenue up 3.2 pct to 6.32 bln euro

* To propose 2.20 eur per share dividend for 2017 (Updates with details)

PARIS, Feb 8 (Reuters) - Societe Generale suffered a plunge in quarterly profits as tax-related and restructuring costs weighed on the bank's earnings, yet the results still beat forecasts as a drop in capital markets trading was shallower than many of its peers.

Fourth quarter net income at France's third-biggest bank fell to 69 million euros ($84.7 million) from 390 million a year earlier, but it exceeded market expectations that forecast a 303 million loss, according to a Reuters poll of 6 analysts.

The bank said it was starting 2018 with confidence "in an economic and financial environment that should gradually be more favourable".

SocGen's chief executive Frederic Oudea is aiming to put the lender, whose valuation has been penalised by litigation risks, on a more stable footing with a cost-cutting drive across its retail and investment bank activities.

Oudea is also targeting investments in digital technologies to keep up with changing customers' behaviour.

Fourth quarter revenue rose at one out of its three businesses - international retail banking and financial services, where business in Russia is recovering following the economic uncertainty linked to sanctions imposed on it over the Ukraine conflict.

Even though revenue fell 5 percent at SocGen's investment banking arm, those results showed a relatively bright spot in trading when compared to European and U.S. rivals.

Its fixed income, currencies and commodities (FICC) trading revenue fell 6.5 percent, versus a 27.4 percent decline at BNP Paribas and a 31 percent drop on average at the big five U.S. banks in the fourth quarter.

"The decline in volatility which began early in the year continued, leading to reduced investor activity. In this environment, structured products remained dynamic," the bank said in a statement.

Earlier this week, SocGen's French rival BNP Paribas reported quarterly net profit that fell short of market forecasts although BNP Paribas slightly increased its 2020 profitability target.

SocGen, which derives a third of its revenue from French retail banking, said that this business was still feeling the pinch from low interest rates and renegotiations of loans that were impacting margins, as its revenue declined 4.3 percent.

However, SocGen said its target for 2018 was to stabilise revenue in French retail, while making progress on its restructuring plan that envisages 1.1 billion euros in savings over the next three years.

($1 = 0.8147 euros) (Reporting by Maya Nikolaeva and Mattthieu Protard Editing by Sudip Kar-Gupta)