401(k) & Retirement Growth Calculator (2026)

Building long-term wealth for retirement depends primarily on time in the market and the compounding power of tax-advantaged employer plans. A 401(k) plan allows employees to contribute pre-tax earnings (or post-tax Roth dollars), reducing current-year taxable income while investments compound tax-deferred until retirement.

For Tax Year 2026, the IRS elective deferral limit has increased to $24,000 (with projections reaching $24,500) for workers under age 50. Workers aged 50 and older can make additional catch-up contributions of $7,500. Furthermore, under the SECURE 2.0 Act, participants aged 60, 61, 62, and 63 qualify for an enhanced "super catch-up" limit of $11,250 (or 150% of the standard catch-up), providing accelerated wealth accumulation in the years immediately preceding retirement.

When evaluating retirement readiness, financial planners frequently apply the 4% Safe Withdrawal Rule (derived from the landmark Trinity Study). This rule suggests that withdrawing 4% of your total portfolio balance in your first year of retirement, adjusted annually for inflation, provides a 95%+ probability that your savings will endure across a 30-year retirement. Use this tool to model your future nest egg, estimate monthly retirement income, and see how increasing monthly contributions by just 1% to 2% transforms your financial freedom.