Chief executives of the country's biggest firms will already have notched up £27,645 in 2016 pay by the end of today, which is equivalent to the average employee's annual salary, the High Pay Centre found.
Today has now been marked 'Fat Cat Tuesday 2016' by the non-party think tank.
In total, the leaders of FTSE 100 companies bank an average £4.96million a year, after incentives have increased by a whopping 50 per cent since last year.
Over the same time period, British worker pay has increased by just £445 from £27,200.
The think tank said the figures underscore the problem of the pay gap between the company's top earners and the lowest.
Critics said the Government is not doing enough to curb ballooning fat cat pay packets.
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TUC General Secretary Frances O’Grady said: “Every worker deserves a fair share of the wealth they help create.
"But the average weekly wage is still worth £40 a week less than before the financial crisis.
"The Government must start making the right choices to deliver a fair economy with fair pay, like giving workers more collective pay bargaining rights.”
The High Pay Centre said companies should be made to publish their individual pay gaps.
Director Stefan Stern said: “‘Fat Cat Tuesday’ again highlights the continuing problem of the unfair pay gap in the UK.
“We are not all in this together, it seems.
"Over-payment at the top is fuelling distrust of business, at a time when business needs to demonstrate that it is part of the solution to harsh times and squeezed incomes, and is promoting a recovery in which all employees can benefit."