401K Calculator Suite API

Comprehensive 401K retirement planning API with 5 separate endpoints: contribution-growth, rmd-calculator, withdrawal-planner, scenario-comparison, and catch-up-contribution. Calculate 401K growth with employer matching, Required Minimum Distributions for age 73+, retirement withdrawal sustainability, compare multiple scenarios side-by-side, and analyze catch-up contribution impact for ages 50+. Includes IRS compliance checks, year-by-year projections, and multiple output formats (JSON, text, CSV). Essential for financial advisors, retirement planners, robo-advisors, and 401K plan administrators.