7 Retirement Planning Myths That Could Cost You Your Financial Security

Myth 1 and 2: Lower Tax Bracket and the 70% Rule

Myth 1: You will automatically be in a lower tax bracket in retirement. This assumption drives the decision to prioritize tax-deferred 401(k) savings over tax-free alternatives. The problem is that it is frequently wrong. In retirement, you lose the deductions that reduced your taxable income during working years: the 401(k) contribution deduction, mortgage interest deduction (if the house is paid off), child tax credits. Meanwhile, new taxable income sources appear: required minimum distributions, potentially pension income, and the taxable portion of Social Security. A retiree with $80,000 in income from RMDs, Social Security, and a pension - with no mortgage deduction - may pay a higher effective tax rate than they paid at 50 with the same gross income and a full slate of deductions. Myth 2: You need only 70% of your pre-retirement income. Bureau of Labor Statistics Consumer Expenditure Survey data shows that households aged 65-74 spend approximately 83% of what households aged 55-64 spend - not 70%. And in the first two to three years of retirement, the 'honeymoon phase,' many retirees spend at or above their pre-retirement level as they travel, renovate, and pursue delayed interests. The 70% rule works as a starting floor, not a ceiling. Planning to 80-90% is more realistic for most households.

Myth 3 and 4: Social Security and Medicare Coverage

Myth 3: Social Security will cover your basic needs. The average Social Security benefit in 2026 is approximately $1,920 per month. The federal poverty level for a single person is about $1,250 per month. Social Security covers more than poverty-level expenses on average - but it replaces only about 40% of pre-retirement income for the average earner, and less for higher earners. A household that earned $100,000 before retirement can expect roughly $30,000 to $40,000 per year in combined Social Security for a couple - covering less than half their pre-retirement income and not accounting for healthcare costs that were previously employer-subsidized. Myth 4: Medicare covers most of your healthcare costs. Medicare Part A covers inpatient hospital care and Part B covers outpatient services, paying approximately 80% of approved costs. But Medicare does not cover dental care, vision care, hearing aids, most long-term care, or international healthcare. The 20% cost-sharing on Part B services adds up quickly for retirees with chronic conditions or hospitalizations. Fidelity estimates that a 65-year-old couple needs $345,000 for healthcare expenses in retirement even with Medicare coverage. Add dental, vision, hearing, and long-term care and the realistic figure may exceed $500,000 for a couple.

Myth 5, 6, and 7: Working Longer, Mortgages, and Tax Deferral

Myth 5: You can always work longer if you need more time to save. Research from the Employee Benefit Research Institute shows that approximately 46% of retirees leave the workforce earlier than planned - most commonly due to health problems, disability, or layoff. Ageism in hiring makes re-entering the workforce after 60 genuinely difficult. Planning to 'just work longer' as your fallback is planning on an outcome you may not control. Myth 6: Paying off your mortgage should be the top retirement planning priority. A mortgage at 3-4% interest is a very cheap loan. Redirecting money from tax-advantaged retirement accounts to pay off a low-rate mortgage means giving up the tax deduction, the employer match, and years of compound growth in exchange for eliminating a low-interest liability. For most pre-retirees, maximizing tax-advantaged retirement contributions is the more valuable financial move. The emotional desire to own the home outright is real, but the financial math usually favors continued savings over accelerated payoff at current mortgage rates. Myth 7: Tax-deferred savings are always better than taxable or tax-free alternatives. Tax deferral is only advantageous if your future tax rate is lower than your current rate. Given the TCJA sunset, national debt trajectory, and the gradual growth of tax-deferred accounts into larger RMD obligations, this bet is increasingly uncertain. Tax diversification - holding a mix of pre-tax, Roth, and taxable accounts - is the rational response to an uncertain future.