EXCLUSIVE

Grace VanderWaal didn't just get $1 million for winning "America's Got Talent" ... she also nailed down an extra $100 grand, and a slew of possible bonuses.

The 12-year-old 'AGT' winner from this past summer is set to receive the $100k advance for her 1st album, and then an additional $100k if the record pushes more than 500,000 units in its first year.

According to her contract, Grace is eligible for up to 4 renewals of her deal with Simon Cowell's record label, SYCO -- and each one comes with another $100k.