It is a 6 figure contract with the possibility of making 300k.... if they go 9-0 lol. I know this article is referencing how the TUF winner contract used to be but I'm guessing it's not much more lucrative these days. I know many winners over the years expressed their displeasure in the contract and how the show markets it as some life changing money when that's clearly not the case.
"
The winners of the first three seasons of
The Ultimate Fighter competition, and certain runners-up depending on their performance in their competition finals, receive the touted "six-figure" contract to fight in the UFC. These contracts are specifically three-year contracts with a guaranteed first year.
[27] Each year consists of three fights, the first year's purse per fight consists of $12,000 guaranteed with a $12,000 win bonus (a maximum of $24,000 per fight). The second year's purse per fight is $16,000 with a $16,000 win bonus (a maximum of $32,000 per fight) and the third year's purse per fight is at $22,000 with a $22,000 win bonus (a maximum of $44,000 per fight).
[27]
A TUF winner who goes 9–0 can earn $300,000 total on the contract, but only $150,000 is guaranteed for all three years if nine fights are fought.
[27] Some TUF competitors who did not win the series were also offered UFC contracts, although not on as attractive terms. "
This is via Wikipedia so also take that with a grain of salt.