Final answer:
Amber's maximum salary deferral amount for 2015 is $18,000. If she elects the maximum amount, she can save $5,940 in taxes. The recommended amount for salary deferral treatment depends on individual financial goals and should be determined with professional guidance.
Step-by-step explanation:
a. The maximum amount Amber can elect for salary deferral treatment for 2015 is determined by the IRS contribution limits for § 401(k) plans. For 2015, the maximum contribution limit is $18,000.
b. If Amber elects the maximum salary deferral amount of $18,000, she can save taxes based on her marginal tax rate of 33%. Therefore, she can save $5,940 in taxes (33% x $18,000).
c. The recommended amount for Amber to elect for salary deferral treatment for 2015 depends on her financial goals, expenses, and other factors. It would be best for Amber to consult a financial advisor or tax professional to determine the optimal amount to contribute to her § 401(k) plan.