7 Common Retirement Planning Mistakes
Most retirement shortfalls don't come from bad luck in the market. They come from small assumptions made early on that quietly compound into a much bigger gap. Here are the ones we see most often.
1. Using current expenses without thinking about how they'll change
People often plug in today's spending and assume it stays flat. In practice, spending usually shifts: housing costs may drop if a mortgage is paid off, but healthcare costs typically rise significantly later in retirement. Revisit your expense estimate every few years rather than setting it once and forgetting it.
2. Ignoring taxes on withdrawals
A retirement account balance is not the same as spendable money. Depending on the country and account type, withdrawals may be taxed as income, and this can meaningfully reduce what's actually available to spend. Build in a buffer if your accounts are tax-deferred rather than tax-free.
3. Picking a withdrawal rate without considering retirement length
The 4% rule was built around a 30-year retirement. Retiring at 45 instead of 65 can mean planning for 50+ years, which usually calls for a lower, more conservative withdrawal rate.
4. Forgetting that "already invested" money is still growing
Some people only think about how much more they need to save, without accounting for the fact that their existing investments keep compounding in the background. This is covered in more detail in our piece on compound interest.
5. Not planning for one large, irregular expense
Averages hide lumps. A new roof, a medical procedure, or supporting a family member can all show up as one large expense in a single year. A cushion above your calculated number, rather than an exact target, tends to hold up better in the real world.
6. Reacting emotionally to market downturns
Selling investments after a market drop locks in the loss and removes the chance to recover when the market rebounds. Historical retirement research generally assumes the investor stays invested through downturns — the math falls apart if that assumption is broken.
7. Never revisiting the plan
A retirement number calculated once at age 30 is a starting estimate, not a fixed target. Income, expenses, family situation, and markets all change. Recalculating every year or two, adjusting the inputs as life changes, keeps the plan useful instead of stale.