The Dallas Cowboys and quarterback Dak Prescott have agreed to a four-year, $160 million contract, including $126 million guaranteed on Monday.

The deal, which is for six years but voids to four so to help Dallas against the salary cap.

Prescott’s signing bonus is $66 million, the highest in NFL history, with a record $75 million due in the first year. The first three years of the deal average $42 million per year.

The Cowboys announced they had agreed to a contract with Prescott but did not release terms. The Cowboys placed the franchise tag on Prescott on Tuesday as a procedural matter.

Prescott’s salary-cap number for this season will be $22.2 million instead of the $37.7 million that would have come along with the franchise tag, a savings of $15.5 million against this season’s cap.

“This is my home, I’m not leaving; I’m a Cowboy,” Prescott said.