How Do Transaction Fees Factor into the Total Reward for a Successful Miner?

The total reward for a successful miner who solves a block consists of two parts: the fixed block subsidy (newly minted coins) and the sum of all transaction fees included in that block. As the block subsidy periodically decreases (halving), transaction fees become an increasingly important component of the total reward.

Miners prioritize transactions with higher fees, which is a mechanism that helps clear the mempool.