Schools and State Budgets Certainty Act of 2021 This bill modifies how states, counties, and Indian tribes are paid for mineral extraction on their land. The Department of the Interior shall pay to eligible states, counties, and Indian tribes an energy transition payment as calculated in accordance with this bill. An energy transition payment received by a state or county pursuant to the Gulf of Mexico Energy Security Act of 2006 must be used for certain authorized uses, such as coastal protection and mitigation of damage to wildlife.