PROVIDENCE – Citizens Financial Group Inc.’s parent company, Royal Bank of Scotland Group Plc, may owe $625 million a year if Congress passes a new tax on financial institutions proposed by President Barack Obama.

Obama last week put forward a plan to impose a 0.15 percent tax on the liabilities of the United States’ 50 largest financial institutions, which he said would represent their contribution toward paying down the cost of the economic crisis.

Although the banks have not confirmed how much they expect to owe under the tax, analysts at Morgan Stanley calculated that RBS was likely to face a levy of $79 million a year for Citizens, The Guardian reported.

A separate analysis by Jaap Meijer, a London-based analyst at Evolution Securities Ltd., suggested RBS would owe 383 million pounds ($625.48 million) a year, partly based on its investment banking division, Bloomberg News said.