Monday is Tax Day across America, but one NFL star has his own self-imposed deadline.

And the Giants certainly could have a vested interest.

Seahawks quarterback Russell Wilson gave the team’s front office an ultimatum recently that he wants a new contract completed by April 15 — the first day of the offseason workout program — or he will suspend negotiations.

Wilson’s camp has told Seattle brass they won’t sign a long-term deal at all — not soon, not later — if it isn’t done by Monday at midnight, according to Peter King’s Football Monday in America. That would mean Wilson, who would be a free agent after this season, would be facing a franchise tag (and probably two of them), which he reportedly would accept.

Wilson’s agent, Mark Rodgers, has been in Seattle since Friday to meet with the team and the sides continued to work on an extension, according to NFL Network’s Ian Rapoport.