OAKLAND -- A Hayward man who spent 20 years preparing taxes for clients pleaded guilty in federal court Thursday to filing his own false return and assisting in the preparation of other ones, federal officials announced.

In the agreement, Naushad Buksh admitted he intentionally signed and filed false U.S. Individual Income Tax Returns with the Internal Revenue Service while operating a Hayward-based tax preparation business from 2007 through 2010, said U.S. Attorney Melinda Haag in a statement.

Buksh, who prosecutors say prepared taxes for approximately 20 years, underreported the gross receipts of the business by nearly $600,000, resulting in a tax loss by the IRS of $160,528, Haag said.

He also admitted to fabricating false deductions and credits to create fraudulent refunds for his clients.

Buksh, 56, was charged last May with four counts of making and subscribing false tax returns and 41 counts of assisting in the preparation of false tax returns. He pleaded guilty to every count, Haag said.

He will be sentenced April 11, with each count holding a maximum penalty of three years in prison and a $250,000 fine.

Rick Hurd covers crime. Contact him in Walnut Creek at 925-945-4780 and follow him at Twitter.com/3rdERH.