Eva is excited to start her position in the Accounting Department of Longevity, Inc., a local company known for its employees staying with the company for their whole career. While filling out her new hire packet to select health care coverage and other benefits, Eva must decide which retirement plan option offered by Longevity, Inc. makes the most sense for her personal goals. Longevity, Inc. offers a Roth plan or a Traditional plan for retirement savings. Eva considers the following variables, constraints, and assumptions: Her starting salary is $120,000; Longevity, Inc. has historically increased employee compensation by 3% annually. She wants to contribute 5% of her annual salary to the retirement account, but must keep her after tax take home pay the same regardless of the chosen option. Longevity, Inc.s retirement investment options are expected to earn a 12% rate of return. Eva expects to work for Longevity, Inc. for 30 years and will spend 20 years in retirement. During retirement, Eva intends to exit her retirement account investments and will take an even distribution of the retirement savings each year. Evas goal is to maximize her after tax cash flow in retirement but also wants to minimize the amount of tax she pays over her lifetime. Using 2021 income tax brackets and assuming the inflation adjustments to tax brackets and standard deduction continue as trended from 2019 to 2021, you have created the following Tableau visualization to help Eva make a decision.

What additional variables would you advise Eva to consider for the model? Elaborate on how your suggested variables may impact the model from a tax perspective.