Retiring with enough savings is a milestone — but keeping those savings working for you over a potentially 20- or 30-year retirement is a different challenge entirely. The financial decisions you make in the first few years of retirement can have an outsized impact on your long-term security.
Many of the most damaging money mistakes retirees make are entirely avoidable. Here are five of the most common ones, and what to do instead.
1. Withdrawing from Savings Too Quickly
One of the biggest risks in retirement is outliving your money — and it's more common than people expect. With retirements lasting 20 to 30 years for many people, a withdrawal rate that seems reasonable early on can deplete your portfolio far sooner than anticipated.
The traditional "4% rule" — withdrawing 4% of your portfolio in year one and adjusting for inflation each subsequent year — has been a long-standing guideline. But it was developed for a specific set of market conditions, and many financial planners today suggest a more conservative approach, particularly for early retirees or those with limited other income sources.
What helps: Create a clear withdrawal strategy before you need the money. Consider the sequence of accounts — in general, drawing from taxable accounts first, then tax-deferred accounts like traditional IRAs, then Roth accounts — can help minimize your tax burden over time. Work with a financial planner to stress-test your plan against different scenarios, including extended market downturns.
2. Underestimating Healthcare Costs
Healthcare is typically one of the largest and least predictable expenses in retirement — and most people underestimate it significantly. Even with Medicare, out-of-pocket costs for premiums, copays, prescriptions, dental care, vision, and potential long-term care can add up to hundreds of thousands of dollars over a long retirement.
The mistake many retirees make is budgeting for healthcare as it stands today, rather than what it's likely to be in 10 or 15 years. Medical costs have historically risen faster than general inflation, and your own needs are likely to increase with age.
What helps: Build a dedicated healthcare cushion into your retirement budget. Look into whether a Health Savings Account (HSA) — if you had one before retiring — can cover qualified medical expenses tax-free in retirement. Investigate long-term care insurance options before you need them; premiums rise sharply with age. And don't skip Medicare's free preventive services — catching problems early almost always costs less than treating them later.
3. Ignoring Inflation's Slow Erosion
Inflation doesn't make headlines the way stock market crashes do, but it's just as dangerous to retirement finances. At an average inflation rate of 3%, the purchasing power of a fixed income is cut nearly in half over 25 years. A monthly budget that feels comfortable at 65 may feel quite tight at 80 if your income hasn't kept pace.
Retirees who move entirely into "safe," low-return investments like CDs and bond funds — understandably seeking stability — can end up losing ground to inflation without realizing it until real damage is done.
What helps: Maintain some exposure to growth-oriented investments (such as a diversified stock portfolio) even in retirement. The specific balance depends on your timeline, risk tolerance, and other income sources, but most financial advisors caution against abandoning equities entirely. Social Security benefits include an annual cost-of-living adjustment (COLA), which helps — another reason delaying Social Security to maximize your benefit can be valuable if you're able to do so.
4. Co-Signing Loans for Adult Children or Grandchildren
This one is difficult, because it sits squarely at the intersection of money and family love. When an adult child needs help securing a car loan, a mortgage, or a student loan, and asks you to co-sign, it can feel like an obvious, harmless way to help.
But co-signing is not a formality — it's a full financial commitment. If the borrower misses payments, you are legally responsible for the debt. Missed payments will damage your credit. In a worst case, you could be sued by the lender. And because many retirees are on relatively fixed incomes, absorbing an unexpected debt obligation can be genuinely destabilizing.
What helps: If you want to help a family member financially, consider giving an outright gift if you can afford it — you maintain control and there's no hidden risk. If they truly need a co-signer, have a frank conversation about your financial situation and what a default would actually mean for you. It's not unloving to protect yourself.
5. Not Having — or Not Updating — a Financial Plan
Many people approach retirement without a written plan, relying instead on a general sense that they have "enough." Others made a plan years ago and haven't revisited it since. Both approaches leave you vulnerable.
A retirement without a plan is reactive: you respond to expenses and market changes as they come, without a clear picture of where you're headed. That makes it easy to drift into the other mistakes on this list without realizing it.
A financial plan doesn't need to be complicated, but it should address:
- Your expected income from all sources (Social Security, pensions, investment withdrawals, any part-time work)
- Your projected monthly and annual expenses — both fixed and variable
- Your withdrawal strategy and the accounts you'll draw from
- Your asset allocation and how it will shift as you age
- How you're planning for healthcare and potential long-term care needs
- Your estate planning documents — will, power of attorney, healthcare directive
What helps: Review your plan annually, and whenever something significant changes — a major purchase, a health event, a change in family circumstances. A fee-only financial planner (one who doesn't earn commissions on products they recommend) can be worth the cost for an objective review, particularly if you're navigating a complex situation.
The Bigger Picture
Retirement financial planning is ultimately about protecting the freedom and security you've spent a career building. None of these mistakes are inevitable — they're just common. The more clearly you can see them, the easier they are to avoid. And if you've already made one or two of them, course-correction is almost always possible. What matters most is having a plan and revisiting it regularly.