Quick Read Business owners over 50 can stack a cash balance plan on top of a 401(k) to shelter nearly $300,000 from taxes in a single year. Cash balance contribution limits grow with age, with a 55-year-old able to deduct roughly $200,000, rising to over $260,000 at 60 and $300,000 at 65. The plan must be adopted by December 31, requires between 3 and 5 years of contributions, and mandates funding between 5 and 8% of pay for all eligible employees. A recent study identified one single habit that d ...