49ers contract details: Trent Williams deal creates major 2026 salary cap relief

The contract also includes four void years to spread bonus money throughout the total length of the deal.

Full contract breakdown (via OverTheCap)

2026
Base salary: $1,300,000
Prorated signing bonus: $17,765,786
Total per-game roster bonus: $900,000
Workout bonus: $100,000
Guaranteed salary: $2,300,000
Salary cap number: $20,012,845

2027
Base salary: $1,500,000
Prorated signing bonus: $16,676,002
Prorated option bonus: $2,200,000
Regular roster bonus: $500,000
Total per-game roster bonus: $900,000
Workout bonus: $100,000
Guaranteed salary: $12,500,000
Salary cap number: $21,876,002

2028 (void year)
Base salary: —
Prorated signing bonus: $13,029,002
Prorated option bonus: $2,200,000
Regular roster bonus: $11,500,000
Guaranteed salary: $11,500,000
Salary cap number: $28,119,002

2029 (void year)
Base salary: —
Prorated signing bonus: $4,400,000
Prorated option bonus: $2,200,000
Regular roster bonus: $50,175,000
Salary cap number: $15,480,000

2030 (void year)
Base salary: —
Prorated signing bonus: $4,400,000
Prorated option bonus: $2,200,000
Salary cap number: $0

2031 (void year)
Base salary: —
Prorated option bonus: $2,200,000
Salary cap number: $0

Total
Base salary: $2,800,000
Prorated signing bonus: $56,270,790
Prorated option bonus: $11,000,000
Regular roster bonus: $62,175,000
Total per-game roster bonus: $1,800,000
Workout bonus: $200,000
Guaranteed salary: $26,300,000
Salary cap number: $85,487,849

Key contract notes

In 2027, Williams' base salary and an $11 million option bonus are fully guaranteed. The 49ers have until September 1, 2027, to exercise that option or convert it into a roster bonus.

If Williams remains on the roster as of that date and participates fully in offseason activities, he will earn an $11.5 million roster bonus in 2028, which becomes fully guaranteed once triggered.

Looking further ahead, San Francisco must act before the 10th day of the 2028 league year to either extend or move on from Williams. Otherwise, a massive $50.175 million roster bonus for 2029 would become fully guaranteed.

According to OverTheCap, the 49ers currently sit at approximately $71.28 million in available salary cap space.