The Oil Company Windfall Profits Tax Act of 2026 would impose a 50 percent federal fee on excess profits earned by integrated oil companies starting in 2026. The fee applies to profits that exceed a company's average profits from 2021 through 2025, adjusted upward by 10 percent as a baseline. The legislation targets major oil corporations that report substantially higher earnings than their historical average, while allowing them to deduct the fee from their taxes. Revenue generated from this fee would be directed toward the Highway Trust Fund, the Mass Transit Account, and the Leaking Underground Storage Tank Trust Fund to support transportation and environmental infrastructure. The bill would take effect for tax years beginning after December 31, 2025.