A UBS client has pleaded guilty to filing a false income tax return and concealing more than $3m (£2m) in assets in a secret Swiss bank account, leaving him facing a maximum of three years in prison and a fine of up to $250,000. Robert Moran, a Ft. Lauderdale yacht broker, has become the first accused to plead guilty to the charges. Last week, US authorities charged Florida-based accountant Steven Rubinstein in the first of what they have said could be a series of tax-evasion prosecutions of American clients of UBS. Moran has pleaded guilty to filing false tax returns that failed to report he had a bank account with UBS in Switzerland or that reported the income he earned on any UBS Swiss bank accounts. 'We will continue to prosecute those who use offshore schemes to avoid paying their taxes,' said Alexander Acosta, the US attorney for the Southern District of Florida. US citizens who have an interest in, or an account in, a foreign country with assets in excess of $10,000 are required to disclose its existence as part of their income tax return.