7 Costly Social Security Mistakes Many Boomers Don’t Realize They’re Making

Many baby boomers spent decades paying into Social Security, so when they reach retirement, it may feel like something they should just be able to "turn on." But a few simple choices about when and how you claim can shrink your lifetime income by tens of thousands of dollars. The median retired worker benefit in 2026 is slightly more than $2,000 a month, so each permanent reduction is significant.

Social Security was designed to cover about 40% of your pre-retirement earnings on average, not your whole paycheck. That means it is all the more necessary to avoid money mistakes that leave money on the table. Here are key Social Security slip-ups many boomers make, plus easy ways to avoid them.

Not knowing your full retirement age

Your full retirement age (FRA) is when you qualify for 100% of your earned benefit. For most boomers, this age is either 66 or 67, depending on their year of birth, but many still believe it is 65. If you claim before reaching FRA, your payment is cut for life.

Let's say your FRA is 66 and 10 months, but you file at 65 because that feels like "retirement age." You might permanently lock in a benefit that is between 5% and 10% lower than you expected. Checking your exact FRA on your Social Security statement or the SSA website is one of the simplest ways to protect your income.

Claiming benefits too early without a plan

One of the costliest mistakes is claiming at 62 just because you can, without running the numbers. If you file at 62, your benefit may be reduced by roughly 25% to 30% compared to waiting for FRA. That lower amount lasts as long as you do.

Suppose your complete retirement age benefit would be $2,000 per month. At the age of 62, this could reduce that to about $1,400, a difference of $600 each month. That's more than $7,000 a year, and over a 25-year retirement, you may sacrifice more than $175,000.

Ignoring the value of waiting up to age 70

On the flip side, many boomers never look at what waiting past FRA could mean. For people born in 1943 or later, Social Security increases your benefit by about 8% per year you delay past the FRA, up to age 70. Once you claim it, that higher amount is yours for life.

Assuming that your FRA benefit is $2,000 and you do not collect it until you are 70, you may receive approximately $2,480 instead. The additional $480 monthly adds up to more than $5,700 yearly, and any future rise in the cost of living is pegged on that higher figure. Not everyone should delay, but it is worthwhile to compare the claim now and the claim later before making a decision.

Overestimating how much Social Security will cover

A subtle mistake is expecting Social Security to pay for most of your retirement lifestyle. On average, it replaces about 40% of pre-retirement income, according to the National Council on Aging. Higher earners may see an even lower replacement rate.

To illustrate, say you earned $70,000 before retirement, and your Social Security happens to be about $2,300 a month, or approximately $27,600 per year. You are not receiving more than $40,000 a year of your previous salary. This early acknowledgment of a gap leaves you with time to cut down spending, save more, or arrange to work part-time if necessary.

Not coordinating with your spouse

Married couples sometimes make Social Security decisions in isolation instead of working together. One spouse may grab benefits early, "just to get something," without considering the household. However, when you combine spousal and survivor benefits, timing options can impact both of you.

Suppose that one spouse has a full retirement age benefit of $2,400 and the other, $1,000. If the first spouse defers until 70, their benefit could grow to about $3,100. If that person dies first, the surviving spouse could then receive the $3,100 as a survivor benefit instead of $1,000 — a major difference.

Overlooking spousal and survivor benefits

Not all boomers know they can receive benefits based on a spouse's or ex-spouse's record. Spousal benefits are up to 50% of that of the higher earner at FRA, and survivor benefits can be more. Ignoring these options may mean walking away from money you are entitled to.

For example, if your own benefit is $700 at FRA but your spouse's is $2,000, a spousal benefit could be up to $1,000, depending on when you claim. After your spouse dies, your benefit could then step up to most or all of that $2,000. Knowing these rules helps you compare your options instead of automatically choosing the smaller check.

Forgetting how work and taxes affect benefits

Another surprise: Social Security is not always tax-free, and working while you collect may affect what you actually get. If you claim before FRA and keep working, the earnings test may temporarily withhold part of your check when your wages cross certain limits. And at many income levels, up to 50% or 85% of your benefits may be taxable.

That does not mean you should avoid working, but it does mean planning helps. For example, if your combined income exceeds $25,000 per year, employment income may add to your tax bill. Discussing your work, withdrawals, and benefits with a tax or financial professional will help you avoid unwanted surprises.

Bottom line

Social security might not take care of all your retirement expenses, but it is also a big source of income to most boomers. Jumping the gun, not realizing the importance of waiting, not accounting for what rewards will compensate, and not coordinating with a spouse are all easy ways to slip up that could silently cut your monthly paycheck.

The flipside is encouraging — a simple "check-up" on your Social Security plan can go a long way. Knowing your full retirement age, reviewing your earnings record, testing different claiming ages, and talking through options with your spouse may help. That way, you keep more of the money you already earned and move closer to the stress-free retirement you want.

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