Filers whose salaries have not kept pace with inflation could see savings on their federal income tax bills. The rapidly rising cost of food, energy, and other daily staples could allow many Americans to reduce their tax bills next year. Tax rates are adjusted for inflation, which typically means incremental movements in the thresholds for what income is taxed at what rate. But after a year that brought America’s fastest price growth in four decades, the shift in rates is far more notable: an …