The agency group calculates an agency would need to sell seven extra holidays to fund the salary, national insurance and pension contributions increase of that employee.
It based calculations on a £3,000 holiday and the commission seven extra sales would generate. However, it stressed it was not against the increase in minimum wage levels, which come into force on 6 April.
TTNG chief executive Gary Lewis urged members to examine whether there were savings to be made in renegotiating utilities including water, gas and electricity to offset the increased costs.
He also urged agents to maximise their biggest asset, relationships with their customers.
