Charles Saatchi and Nigella Lawson could face an investigation into their tax affairs after their two former aides were cleared on fraud charges.
Tax specialists said HM Revenue and Customs may contact the divorced couple to check whether gifts to Francesca and Elisabetta Grillo and other employees 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 ($1.35 million) they were accused of fraudulently spending on a company credit card, or that their employer paid National Insurance contributions on it.
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.