2021 Important Numbers: Retirement, Tax, and Medicare Planning Jeanne Sullivan | Nov 19, 2020 Categories Investments Retirement Planning Tax Planning 2021 Important Numbers What are the 2021 tax rates? What is the max I can contribute to my 401(k), 403(b), 457 or my Health Savings account plans in 2020? To find the answer and other financial planning related numbers read our chart.