The Voice UK could end up costing the BBC as much as £25 million over the next two years, it has been claimed.
The show, originally brought for £11 million a series from Dutch production company Talpa, has proved a big hit on Saturday nights, with over 10 million viewers watching.
But it's meant that costs have also increased, including the pay offered to the show's coaches.
"The £22 million figure was before the judges were hired when no one had any idea whether the series would be a success," a supposed insider told the Daily Mail.
They added: "Now it’s the biggest show on TV, it is naive to think they will return next year without a significant pay hike. That’s how showbusiness works."
But the extra cost could impact the Beeb's other shows.
"Every penny has come from the annual budget for entertainment shows, so we haven’t cut back on drama or news to fund it," the source added.
At £650,000 an episode however the show is still cheaper than rival The X Factor, which costs around £1 million for each broadcast.