Your Pretax Savings Growth How much better is it to save in a pre-tax plan (such as 401k) than a regular savings account?  Fill in the form below and see.   How much do you have in savings now? How much can you save per pay period? Now many pay periods per year? What annual interest rate do your savings earn? What combined Federal and State Tax Bracket are you in? How many years in the future do you want to see? Powered by yourmoneypage.com.    This calculator is provided as a free service. No guarantee, explicit or implied, is made regarding its' accuracy or suitability to a specific purpose.