Nigella Lawson and Charles Saatchi could face an inquiry into their tax affairs after their two former aides were cleared on fraud charges.
Tax specialists said revenue officials may contact the divorced couple to check whether gifts made to Francesca and Elisabetta Grillo and other staff were declared as taxable benefits in kind.
The Grillos and other employees could also be pursued for tax on gifts, such as holidays.
The Grillos have never suggested they declared any of the £685,000 they were accused of fraudulently spending.
Jason Collins, a tax expert at Pinsent Masons, said: "If an employer provides an employee with anything that is not specifically needed for their work, that is counted as a taxable benefit."