You can reduce taxes and save for retirement by contributing to a tax-advantaged retirement plan. If your employer offers a 401k or Roth 401k plan, contributing to it is a taxwise way to build a nest egg. If you’re not already contributing the maximum allowed, consider increasing your contribution rate between now and year end. Because of tax-deferred compounding (tax-free in the case of Roth accounts), boosting contributions sooner rather than later can have a significant impact on the size of your nest egg at retirement. With a 401k, an employee elects to have a certain amount of pay deferred and contributed by an employer on his or her behalf to the plan. The contribution limit for 2019 is $19,000. Employees age 50 or older by year...