Social Security is one of the most important financial lifelines for American retirees — but it’s also one of the easiest to get wrong. A handful of avoidable mistakes can quietly shrink your monthly check, sometimes permanently. Here’s what you need to know before you file.
Claiming Too Early
The single biggest mistake most retirees make is filing for benefits before reaching their Full Retirement Age (FRA). For everyone born in 1960 or later, full retirement age is now 67 — and filing before then comes at a steep price. Claiming at 62 instead of waiting until full retirement age can reduce your benefits by as much as 30%, and that reduction is permanent.
Many people file early because they want the cash flow to start, or because they don’t trust the system will be there later. But the math rarely favors impatience. Delaying your claim past your full retirement age, up to age 70, can increase your monthly benefits — a strategy most beneficial if you live past the breakeven point, typically around age 82. For someone who delays Social Security until age 70, the monthly benefit would be $5,251 in 2026.
Working While Collecting — Without Knowing the Rules
If you claim Social Security before reaching your FRA and continue working, you can trigger what’s known as the earnings test, which reduces your benefits if your income exceeds a set limit.
For 2026, retirees who have not yet reached full retirement age can earn up to $24,480. Above that amount, the SSA withholds $1 for every $2 earned. Retirees who do reach FRA during 2026 can earn up to $65,160, after which $1 is withheld for every $3 earned.
For example, if you earn $40,000 from work in 2026, your benefits for the year would be reduced by $7,760 — half the difference between $24,480 and $40,000.
The good news: once you reach FRA, the earnings test goes away entirely, and the SSA recalculates your benefit upward to credit you for the months withheld. But in the short term, the hit can be a nasty surprise.
Ignoring Taxes on Your Benefits
Many retirees are shocked to discover their Social Security income is taxable. Up to 50% of your benefits become taxable once your combined income exceeds $25,000 for individuals or $32,000 for joint filers. If your combined income exceeds $34,000 as a single filer or $44,000 for joint filers, up to 85% of your benefit can become taxable.
Your “combined income” is your adjusted gross income, plus any nontaxable interest, plus half of your Social Security benefits. These thresholds haven’t been adjusted for inflation in decades, meaning more and more retirees are caught by them each year. A Roth conversion, part-time work, or a large retirement account withdrawal can all push you into a higher tax bracket on your benefits.
Letting Medicare Premiums Eat Your Check
Most beneficiaries have Medicare Part B premiums automatically deducted from their Social Security payments, reducing the amount they actually receive. For 2026, the standard Part B premium rose to $202.90, up from $185 in 2025. Higher-income retirees may also face additional surcharges called IRMAA (Income-Related Monthly Adjustment Amount), which can add hundreds more per month.
When premiums rise faster than the annual cost-of-living adjustment, net benefits can actually decline even in years when gross benefits increase. In 2026, the COLA was 2.8% — but with Part B premiums rising by roughly 10%, many retirees saw that raise almost entirely absorbed by healthcare costs.
Filing Without a Spousal Strategy
For married couples, Social Security isn’t just two separate decisions — it’s a household plan. A spousal benefit can be as much as half of the worker’s primary insurance amount when claimed at full retirement age, and it can be reduced if claimed earlier. Survivor benefits are also affected by when the higher earner claims — if that spouse took a reduced benefit, the surviving spouse may collect less for the rest of their life.
It can make sense for one spouse to claim Social Security while the other delays their claim to lock in larger monthly checks — but this requires coordination, not independent decisions made in a vacuum.
Not Checking Your Earnings Record
Your Social Security benefit is calculated based on your 35 highest-earning years. If there are errors in your earnings record — a missing job, a year of wages incorrectly recorded — your benefit could be lower than it should be. Checking for errors early can protect your lifetime benefits without requiring you to change anything else in your plan.
You can review your earnings history anytime at ssa.gov by logging into your My Social Security account.
Social Security seems straightforward, but small missteps can cost thousands of dollars over a retirement. The most damaging mistakes — claiming too early, ignoring the earnings test, overlooking taxes — often don’t feel like mistakes in the moment. They feel like relief.
The best defense is a plan made before you file, ideally with a financial advisor who specializes in retirement income. A few hours of preparation now could mean hundreds of extra dollars every month for the rest of your life.
Note: This article is for informational purposes only and does not constitute financial or legal advice. Consult a qualified financial advisor for guidance specific to your situation.
