FIFO is a cost-basis method where the first shares you bought are the first ones sold. Because your oldest shares usually have the highest embedded capital gains, your tax bill is often highest at the start of your retirement. Many calculators assume an "average" profit component, but the FIFO logic means your early withdrawals might be taxed more heavily than later ones, potentially affecting your portfolio's early survival (Sequence of Returns Risk).

If you retire today on $2,000 a month, that same $2,000 will buy significantly less in 20 years. To maintain your lifestyle, you must increase your withdrawals annually to keep up with inflation. This "inflation spiral" puts mounting pressure on your portfolio. Our simulator automatically adjusts your monthly withdrawal amount based on the inflation rate, showing you the result in **today's purchasing power**.

From a tax perspective, many modern systems treat dividends and long-term capital gains similarly. However, selling shares gives you more control. You only pay taxes on the *profit component* of the sale, whereas dividends are usually taxed on the full amount. This "Basis Recovery" makes selling shares slightly more tax-efficient in the early years of a withdrawal plan.

This is the risk that a market crash occurs early in your retirement. If the market drops 30% while you are still withdrawing $2,000 a month, you are forced to sell a much larger percentage of your remaining shares. This can lead to premature portfolio depletion even if the long-term average market return is positive. Having a "Cash Buffer" for 1-2 years of expenses is a common strategy to mitigate this risk.

A fixed amount adjusted for inflation is easier for personal budgeting but riskier for the portfolio. A variable rate (e.g., % of current portfolio value) ensures the portfolio never hits zero, but it means your income will fluctuate with the stock market. Most experts recommend a "Guardrail" approach: start with a fixed amount, but reduce spending slightly if the market drops significantly.

Investors often use "Specific Identification" (if allowed by their broker) to sell shares with the least profit first to defer taxes. If stuck with FIFO, you can consider "Asset Location" strategies, holding high-growth assets in tax-advantaged accounts (like a 401k or IRA) and dividend-paying assets in taxable accounts, depending on your local tax law.