What is the biggest mistake people make when estimating retirement income?

The biggest mistake people make when estimating retirement income is assuming that Social Security benefits will be sufficient to cover all, or even most, of their post-retirement expenses. This often leads to a significant underestimation of actual financial needs. Many individuals project their current lifestyle costs forward without accounting for inflation, potential healthcare cost increases, or desired discretionary spending that Social Security simply isn't designed to support fully. Another common error is failing to consider the taxability of Social Security benefits, which can reduce the net income received. Furthermore, people often overlook the importance of having a diversified income strategy that doesn't solely rely on a single source. They might not factor in the need for an emergency fund, long-term care expenses, or the desire to maintain a comfortable standard of living that goes beyond basic necessities. This oversight can result in a substantial income gap in retirement, forcing retirees to drastically alter their lifestyle or return to work. A comprehensive understanding requires a holistic view of all potential income sources, along with a realistic assessment of both fixed and variable expenses throughout retirement.