It is believed that if the 35-year-old star comes back on board, the group would be able to perform even more sell-out shows to boost their income.
Williams has signalled that he is ready to rejoin the boy band after overcoming their differences following his bitter departure in 1995.
He has said that he has healed the rift with songwriter and former band mate Gary Barlow, and that the rest of the group are eager to see him return.
PRS for Music, the industry's royalty collection organisation, has indicated that the move could be lucrative for the entire band.
The organisation's spokesman Barney Hooper said: "Take That's tours will sell-out anyway but if Robbie rejoins the group it will give them the ability to repeat their tours because people will go back to see them all together.
"It also gives them the ability to extend their tours so everyone benefits financially by Robbie coming back."
Take That disbanded in 1996, a year after Williams's departure, but have sold more than 6 million albums since members Mark Owen, 37, Jason Orange, 38, Howard Donald, 40, and Barlow, 38, reformed in 2005.
They have scored number one hits with the songs Patience and Shine.
Williams, who has had a successful solo career since the split with hits including Angels and Let Me Entertain You, told the Daily Mirror that he was ready to rejoin the band.
He said: "I'm in regular contact with them, even Gary, and it's looking more likely by the week. The lads all seem up for it and some people think it's a done deal. I think it would be fun.
"Let's see what happens, but my head's in the right place, so the timing could be right if Gary calls. I think it would be fun. It would be good."
