15 Social Security Mistakes That Can Cost You Thousands

Social Security is one of the only sources of retirement income that is guaranteed for life and adjusted for inflation every year. That also means the decisions you make about it are hard to undo. Claim at the wrong time, misread a rule, or skip a form you did not know existed — and the mistake does not cost you once. It can cost you every single month for the rest of your life.

Below are 15 of the costliest and most common Social Security mistakes, current as of 2026. A few of these — like the taxation of benefits and the rules around public-pension offsets — changed recently, so if you read an older article, some of what it says may already be out of date.

1. Claiming at 62 Without Running the Numbers First

Claiming as soon as you are eligible, at 62, is the single most common Social Security mistake — and often the costliest. If your full retirement age (FRA) is 67, filing at 62 locks in a permanent 30% reduction to your monthly benefit, for life. It does not correct itself later.

Note: FRA is 67 for anyone born in 1960 or later. If you were born between 1955 and 1959, your FRA may be 66 or 66 and a certain number of months. Check your specific FRA at ssa.gov before making any claiming decision.

The average 2026 benefit at FRA is roughly $2,071 a month for all retired workers. Claimed early at 62, that baseline shrinks to about $1,450, whereas delaying to 70 pushes it to approximately $2,568. For a maximum earner who waits until 70, the upper limit reaches $5,181 in 2026.

People often file early out of fear — worry that the program will run out — rather than because the math favors it. For most people who expect to live into their 80s, delaying produces meaningfully more lifetime income.

What to do: Before you file, run a break-even analysis. Compare your total cumulative income at different claiming ages and figure out roughly how long you would need to live for a later claim to pay off. The break-even point is typically around age 80 to 82 — a useful anchor even if you cannot predict your own lifespan. Our Break-Even Age Calculator does this math for you in under a minute.

2. Not Understanding the Earnings Test If You Work Before FRA

If you claim benefits before FRA and keep working, Social Security can temporarily withhold part of your check. In 2026, the limit is $24,480: for every $2 you earn above that while under FRA, $1 in benefits is withheld. In the calendar year you reach FRA, the limit jumps to $65,160, with $1 withheld for every $3 earned above it — and only counting earnings from January through the month before your birthday.

People are frequently blindsided by this, especially those who claim early and then pick up part-time work. The withheld amount is not gone forever — SSA recalculates your benefit upward once you hit FRA to credit back the months that were reduced — but the cash-flow hit in the moment can be a real problem if you were not expecting it.

What to do: Use our Earnings Safety Checker to see exactly how your work income interacts with your benefit based on your current situation. It handles both SSDI and retirement benefit rules and tells you instantly whether you are in the safe zone.

3. Misreading How Social Security Benefits Are Taxed

Many retirees are caught off guard to learn that Social Security benefits can themselves be taxed. Whether they are — and how much — depends on your combined income (your adjusted gross income, plus tax-exempt interest, plus half your Social Security benefit):

• Below $25,000 (single) / $32,000 (married filing jointly): No federal tax on benefits

• Above those thresholds up to $34,000 (single) / $44,000 (joint): Up to 50% of benefits may be taxable

• Above $34,000 (single) / $44,000 (joint): Up to 85% of benefits may be taxable

These thresholds were set in the 1980s and have never been adjusted for inflation, which means more retirees get pulled into taxation every year as benefits rise with COLA adjustments.

One recent legislative shift to keep in mind: the 2025 tax law introduced a temporary $6,000 per-person deduction ($12,000 per couple) for seniors aged 65 and older, running through 2028 on top of the standard senior deduction. While it doesn't entirely repeal taxes on Social Security benefits, it significantly lowers or wipes out tax liability for many middle-income households before phasing out at $75,000 (single) or $150,000 (joint).

What to do: If you are near these thresholds, the order in which you draw from taxable accounts, IRAs, and Roth accounts matters. Roth withdrawals do not count toward combined income, so sequencing withdrawals — and potentially doing Roth conversions before you claim — can lower what you owe in taxes on your benefits.

4. Not Realizing You Qualify for Survivor or Spousal Benefits

This is one of the most expensive mistakes on this list, and it is shockingly common. A 2026 report from the Social Security Administration's Office of the Inspector General found that widows lost more than $113.8 million combined because they did not realize they could claim a survivor benefit and delay their own retirement claim until 70 — collecting the higher of the two, or switching strategically between them over time.

Spousal and survivor benefits are separate entitlements from your own retirement benefit. SSA does not always proactively walk people through every option they qualify for.

What to do: If your spouse or ex-spouse has died, or if you are married and your own benefit is significantly smaller than half of your spouse's, do not assume your only option is your own record. Ask SSA directly what you qualify for under every possible pathway — your own benefit, spousal, and survivor. Our Family Benefits Calculator can help you estimate spousal and dependent benefit amounts before you call.

5. Skipping the Break-Even Analysis on Delayed Claiming

Even people who understand that delaying increases their check often do not run the actual numbers. Delayed retirement credits add roughly 8% per year to your benefit for every year you wait past FRA, up to age 70. Whether that trade-off is worth it depends heavily on your health, family longevity, other income sources, and whether you are claiming for just yourself or coordinating with a spouse.

What to do: Model a few different claiming ages side by side — 62, FRA, and 70 — and look at total cumulative income under a few different lifespan assumptions, not just the monthly amount. A modest longevity assumption can completely flip which age looks best. Our Break-Even Age Calculator does this comparison automatically and shows you the crossover point in plain English.

6. Overlooking Divorced-Spouse Benefits

If you were married at least 10 years before divorcing, and your ex-spouse has since remarried, you may be able to collect up to 50% of your ex-spouse’s benefit, or 100% if they have died, as a spousal benefit. Your ex doesn't need to know you filed. It will not reduce their benefit or the benefit of a current spouse And if you've been divorced for at least two years, you can claim even if your ex hasn't filed.

The catch is that the 10-year rule is applied strictly: a marriage of 9 years and 11 months qualifies for nothing. People sometimes divorce just short of the 10-year mark without realizing what they are giving up, or they never apply because they did not know the benefit existed at all.

7. Not Knowing How Remarriage Affects Survivor Eligibility

If you remarry before age 60 (or 50, if disabled), you generally lose eligibility for a survivor benefit based on a deceased former spouse's record. But if you remarry after 60, that eligibility is preserved. This one detail — the age at which you remarry — can be worth tens of thousands of dollars over a retirement, and it is rarely front of mind when people are making decisions about remarriage.

8. Assuming the Old Public-Pension Penalties Still Apply

For decades, two rules — the Windfall Elimination Provision (WEP) and the Government Pension Offset (GPO) — reduced or eliminated Social Security benefits for teachers, firefighters, police officers, and other public employees who also received a pension from work not covered by Social Security. Both were repealed by the Social Security Fairness Act, signed into law on January 5, 2025, retroactive to January 2024.

If you are a public-sector retiree or the surviving spouse of one- who was previously told your benefits would be cut or zeroed out because of a government pension, that restriction is fully gone. If you never applied because GPO or WEP would have penalized you entirely, you should file now. The SSA has largely finished processing retroactive lump sums and adjusted monthly payments, making this an ideal time to ensure your records are correct.

What to do: If WEP or GPO affected you or a family member in the past, do not rely on old advice. Check directly with SSA or a financial advisor about your current eligibility and any retroactive payments you may be owed.

9. Never Checking Your Earnings Record for Errors

Your future benefit is calculated from your lifetime earnings record, and errors do happen — a missing year of wages, a mistyped Social Security number from an old employer, self-employment income that was not properly reported. Every missing or understated year can lower your eventual benefit amount.

What to do: Create a my Social Security account at ssa.gov and review your full earnings history at least once a year. Errors are much easier to fix while you are still working and have pay stubs or W-2s to prove your case than after you have already filed for benefits.

10. Ignoring Notices from SSA About Reported Earnings

If you are collecting benefits before FRA and working, you are required to report your earnings accurately. Get it wrong — over-report, under-report, or fail to report at all — and you risk an overpayment that has to be paid back, or in some cases a penalty. SSA typically gives you a chance to correct the record before penalties apply, but ignoring their correspondence is how a fixable paperwork issue turns into a financial one.

What to do: Open and respond to all SSA mail promptly. Keep your own year-to-date earnings estimate so what you report matches reality. If you have received an overpayment notice and believe SSA made an error, act quickly — you have 60 days from the date on the letter (not the date you received it) to request reconsideration.

11. Not Understanding Deemed Filing Rules

Before 2016, there was a popular strategy where one spouse could file a restricted application for just a spousal benefit at FRA while letting their own retirement benefit keep growing until 70. That strategy is closed for most people born on January 2, 1954 or later. Under current deemed filing rules, filing for one benefit is treated as filing for all benefits you are eligible for, and you are paid the higher of the two rather than being able to sequence them.

People planning around old advice from a spouse or parent who retired years ago sometimes assume this strategy is still available. It generally is not, with some narrower exceptions — for example, it can still apply in certain survivor-benefit situations. This affects the sequencing decisions described in mistakes 1, 4, and 5 above.

12. Treating Social Security as Your Whole Retirement Plan

Social Security replaces roughly 40% of pre-retirement income for an average earner — not the 70-80% most financial planners suggest you will need. Relying on it as your only income source leaves a real gap, especially once you account for taxes, healthcare costs, and inflation eating into a fixed check over 20 to 30 years of retirement.

What to do: Treat Social Security as one part of a retirement income plan — alongside savings, a pension if you have one, and other investments — rather than the whole plan. Our 2026 Numbers Reference shows all the key figures in one place so you can see clearly how Social Security fits into the overall picture.

13. Filing for Benefits Without Considering Healthcare Timing

Social Security and Medicare eligibility do not line up automatically. You can claim retirement benefits as early as 62, but Medicare eligibility generally does not start until 65. The rules are different for people receiving SSDI — they typically qualify for Medicare after a 24-month waiting period from their first month of entitlement, regardless of age.

Retiring and claiming benefits at 62 without a healthcare plan for the multi-year gap before Medicare starts is a common and expensive oversight. COBRA and ACA marketplace coverage exist as bridges, but they need to be planned for — not discovered after the fact.

14. Falling for Social Security Scams

Scammers impersonating SSA — by phone, text, or email — are a growing and costly problem. They often threaten that benefits will be suspended unless the person pays a fee or provides personal information immediately. SSA does not call to demand immediate payment, ask for gift cards or wire transfers, or threaten arrest over the phone.

Real SSA communication about a legitimate issue comes by mail, and you are always given a way to appeal or verify before any real action is taken.

What to do: Never give personal or financial information to an unsolicited caller claiming to be from SSA. If in doubt, hang up and call SSA directly at 1-800-772-1213 to verify. The real SSA will never be offended that you hung up and called back on the official number.

15. Not Seeking Help Before Making an Irreversible Decision

Some Social Security choices can be changed. You generally have a 12-month window from the date of your entitlement to withdraw your application and repay benefits already received if you change your mind about early claiming. But many decisions, once made, are locked in for life. Given how much money is on the table — often tens of thousands of dollars over a retirement — a single conversation with SSA directly, or with a financial advisor who specializes in Social Security claiming strategy, is inexpensive insurance against an expensive permanent mistake.

What to do: Before you file, spend some time with the free tools on RetireGrid. Our Q&A Library has plain English answers to more than 200 of the most common Social Security questions.

The Bottom Line

Most of these mistakes share a common thread: they are not about bad luck. They are about incomplete or outdated information. The rules around spousal benefits, survivor benefits, taxation, and public-pension offsets have all shifted in the past two years, and old advice — even well-intentioned advice from friends or family who claimed years ago — can lead you astray in 2026.

Before you file, or if you have already filed and are not sure you got it right, it is worth a direct check with SSA at ssa.gov or 1-800-772-1213, or a conversation with a fee-only financial advisor who specializes in Social Security claiming strategy. For a benefit that pays out for the rest of your life, a few hours of research is a small price for avoiding a mistake that compounds for decades.

Sources & Methodology

The information in this article is based primarily on official U.S. government sources, including the Social Security Administration (SSA), Congress.gov, the Congressional Research Service (CRS), and the Internal Revenue Service (IRS).

We use these sources to verify benefit rules, earnings limits, tax provisions, legislative changes, and other figures discussed in this article. Where rules or amounts change, we review the applicable government guidance and legislative sources before updating the article.

Social Security Administration (SSA)

• Retirement age and benefit calculations: SSA's Retirement Benefits Planner provides information about full retirement age, claiming benefits before full retirement age, and how claiming age affects benefits.

• Retirement Earnings Test: Annual earnings-test limits and withholding rules are based on information published by the SSA Office of the Chief Actuary.

• Taxation of Social Security benefits: Social Security benefit taxation thresholds and related rules are cross-checked against SSA and IRS guidance.

• Earnings records: Readers are directed to their official my Social Security account when they need to review their earnings record or benefit information.

Congressional and Legislative Sources

When an article discusses changes to federal Social Security law, we review the applicable legislation and legislative records. For example, changes made by the Social Security Fairness Act are checked against the official legislative record for Public Law 118-273 and H.R. 82 on Congress.gov.

Where additional legislative background is useful, we may also consult Congressional Research Service reports.

Federal Tax Sources

Tax-related information is cross-checked against official IRS guidance and applicable federal tax legislation. This includes information about the taxation of Social Security benefits, deductions, credits, filing rules, and other federal tax provisions discussed in the article.

How We Use Sources

Our goal is to explain government rules in plain English without replacing the official source. Government rules can change, so readers should verify important decisions with the relevant federal agency or a qualified professional.

Primary sources used in this article:

• Social Security Administration (SSA)

• SSA Office of the Chief Actuary (OACT)

• Congress.gov

• Congressional Research Service (CRS)

• Internal Revenue Service (IRS)

Last reviewed: [Aug, 2026]

Use These Free RetireGrid Tools

• Break-Even Age Calculator — Find the right age to claim based on your situation

• Earnings Safety Checker — Check if your work income is safe under the 2026 limits

• Family Benefits Calculator — Estimate spousal, survivor, and dependent benefit amounts

• 2026 Numbers Reference — Every important Social Security figure for 2026 in one place

• Q&A Library — Plain English answers to 200+ Social Security questions