There's a flaw hiding inside every retirement calculator that distorts your Social Security projection — it took waiting until 70 to find the $1,100 gap

What if the number you’ve been mentally budgeting around for the last decade of your working life turned out to be wrong; and wrong in your favor by more than a thousand dollars a month?

That’s exactly what happened to Martin Calloway, a retired civil engineer from Tucson, Arizona, who spent years running spreadsheets on his projected Social Security benefit, according to benefitbeat.org. He knew the general rule: delay claiming past full retirement age and your benefit grows by approximately 8% per year. He’d done the math. He thought he knew what to expect.

He was still surprised by more than $1,100.

What Happened: The Setup Before the Shock

Martin turned 62 in 2018. His Social Security statement at the time showed an estimated benefit of $2,340 per month if he claimed at 62, and $3,280 per month if he waited until his full retirement age of 67. The statement also listed a figure for age 70: $4,070 per month.

He decided to wait. His wife, Renata, was still working part-time as a school librarian, their mortgage was paid off, and Martin had a modest pension from the state of Arizona covering roughly $1,600 a month. Waiting felt manageable, even if some of his friends thought he was being stubborn.

“Everyone kept telling me to just take it,” he recalled. “They’d say, ‘What if you get sick? What if the rules change?’ I heard it constantly.”

Martin held firm. He stopped working at 66 and lived on the pension plus savings, watching his Social Security clock tick toward 70.

Claiming Age	Projected Monthly Benefit (2018 Statement)	Actual Monthly Benefit (2022, at 70)
62	$2,340	N/A
67 (FRA)	$3,280	N/A
70	$4,070	$5,171

When his first Social Security payment arrived in November 2022, the month after he turned 70; the deposit was $5,171. Not $4,070. Martin sat at his kitchen table for a long moment, convinced there had been a mistake.

How Waiting Until 70 Actually Works: and Why the Numbers Shift

The gap between what Martin expected and what he received wasn’t an error. It came from three separate forces working simultaneously over four years, none of which he had fully accounted for when reading his 2018 statement.

First, the 8% annual delayed retirement credit. According to the Social Security Administration, every year you delay claiming past your full retirement age adds roughly 8% to your monthly benefit, up to age 70. From 67 to 70, that’s three years, or approximately 24% more than the full retirement age amount. On a base of $3,280, that alone adds about $787 per month.

Second, Cost-of-Living Adjustments; COLAs, applied to his projected benefit each year even before he claimed. Between 2018 and 2022, Social Security COLAs were 2.8%, 1.6%, 1.3%, 5.9%, and 8.7% in consecutive years. Those compounded adjustments lifted his baseline benefit substantially.

Third, Martin continued working part-time consulting work through age 66, which added two additional high-earning years to his 35-year earnings record. Social Security calculates benefits using your highest 35 years of indexed earnings; replacing lower-earning earlier years with higher recent ones can nudge the benefit upward.

💡 Tip: Your Social Security statement projects benefits using your current earnings record and assumes no future COLAs. The actual benefit you receive at 70 will almost always be higher than what a statement printed years earlier showed, sometimes significantly so. You can review your current earnings record anytime at SSA.gov/myaccount.

The Decisions That Made It Possible: and the Ones That Were Hard

Waiting eight years past the earliest claiming age wasn’t frictionless. Martin’s bridge strategy; using his pension and savings to cover living expenses, required discipline that not everyone can exercise. His monthly expenses in Tucson ran approximately $3,200, meaning the $1,600 pension covered half and savings covered the rest. Over four years of not claiming (ages 66 to 70), he drew down roughly $76,800 from his retirement accounts.

That drawdown stung. There were months when Renata’s reduced library hours made the math feel precarious. Martin’s brother-in-law, who had claimed at 62 and was receiving $2,100 per month, frequently pointed out that Martin had “left money on the table” by not claiming earlier.

What his brother-in-law’s framing missed: the breakeven math. At $5,171 per month versus $2,340 per month, the monthly difference is $2,831. That gap means Martin recoups the cost of waiting; in pure monthly benefit terms, within a calculable window. The longer he lives, the more the delayed strategy compounds in his favor.

None of this was emotionally simple. Martin described the period between 66 and 68 as “the years I second-guessed myself the most.” Watching account balances shrink while waiting on a future payment requires a tolerance for uncertainty that’s genuinely uncomfortable.

Why the $1,100 Surprise Matters Beyond One Person’s Story

Martin’s outcome matters because it illustrates something most pre-retirees underestimate: Social Security benefit projections are snapshots, not guarantees. A statement printed in 2018 cannot account for future COLAs, future earnings, or the compounding effect of delayed credits over multiple years.

For people approaching retirement today, the implications are concrete. SSA data shows Social Security is the primary income source for roughly half of Americans over 65. For that group, a difference of $1,100 per month; $13,200 per year — is not a rounding error. Over a 20-year retirement, that gap compounds to more than $264,000 in additional lifetime income before accounting for future COLAs.

There are real reasons people can’t wait until 70. Health conditions, job loss, caregiving responsibilities, and insufficient savings to bridge the gap all push millions of Americans toward earlier claiming. Those are legitimate constraints, not failures of planning. Martin was fortunate: a pension, a paid-off home, and a working spouse created conditions that made waiting viable.

He had a defined-benefit pension covering baseline expenses
His mortgage was fully paid off before he stopped working full-time
Renata’s income, even part-time, reduced pressure on savings
His health at 66 gave him reasonable confidence in longevity
He had no high-interest debt requiring immediate cash flow

Remove any two of those factors and the calculus shifts. That’s not a caveat — it’s the actual story. Delayed claiming is not universally optimal. It’s conditionally optimal, and the conditions matter enormously.

What Martin Says Now, Three Years Into Collecting

As of March 2026, Martin is 73 and has been collecting Social Security for just over three years. His current monthly benefit, adjusted for subsequent COLAs, sits at approximately $5,640. Renata retired fully in 2024 and is now collecting her own Social Security benefit of $1,890 per month, also delayed past her full retirement age.

Their combined monthly Social Security income is roughly $7,530 — before Medicare Part B premiums, which are deducted directly from Social Security payments, according to benefitbeat.org. At the standard 2026 rate, those premiums reduce their combined deposits by approximately $370 per month, bringing the net figure closer to $7,160.

Martin doesn’t describe the outcome as a triumph of strategy. He describes it as a combination of planning, circumstance, and luck — specifically, the luck of staying healthy long enough for the delay to pay off.

“I think about my friend Doug a lot,” he said. “Doug waited until 69. He died eight months after his first check. There’s no clean answer here. I got fortunate.”

That honesty is worth sitting with. The $1,100 surprise was real. The conditions that made it possible were specific to one person’s life. And the friend who didn’t live to collect what he’d waited for — that’s part of the story too.

Frequently Asked Questions

▸ What is the actual break-even age for someone who delays Social Security from 67 to 70?

Most financial planners put the break-even point somewhere between age 80 and 82, depending on your individual benefit amount. The math is straightforward: delaying to 70 means forgoing 36 months of payments in exchange for a permanently higher check. You divide the total foregone income by the monthly increase to find how long you need to live past 70 to come out ahead. According to Social Security’s 2025 actuarial life tables, the average 70-year-old man has a remaining life expectancy of roughly 14.7 years — which statistically puts most male delayed claimants past their break-even threshold.

▸ If you delay Social Security past 65, how do you enroll in Medicare without missing the deadline?

Medicare eligibility begins at 65 regardless of when you plan to claim Social Security, but if you haven’t started benefits yet, you have to sign up manually. Your Initial Enrollment Period is a 7-month window — opening 3 months before your 65th birthday and closing 3 months after the month you turn 65. Missing it without qualifying employer coverage triggers a permanent 10% surcharge added to your Part B premium for every 12-month period you were eligible but uninsured. The 2025 standard Part B premium was $185.00 per month, so even a single-period penalty adds $18.50 to every bill — permanently, for the rest of your life.

▸ Does Arizona’s state pension reduce Social Security benefits through the Windfall Elimination Provision?

The WEP historically applied to workers who received a pension from employment not covered by Social Security payroll taxes. Arizona’s public retirement system generally does withhold Social Security taxes for most members, so many state employees were already exempt from WEP penalties. This became significantly less of a nationwide concern after the Social Security Fairness Act was signed into law on January 5, 2025, which fully eliminated both the Windfall Elimination Provision and the Government Pension Offset. The SSA reported that the repeal added an average of $360 per month for retirees who had previously been penalized under those rules.

▸ How does the Social Security taxable earnings cap affect what your benefit will actually be at 70?

Your benefit is calculated using your 35 highest-earning years, with wages from each year indexed for inflation. The taxable wage base — the ceiling on income subject to payroll taxes — was $176,100 in 2025. Only earnings up to that limit count toward your benefit formula. Workers who consistently hit or exceeded the wage base across a full 35-year career are the ones most likely to see the published maximum benefit amounts. Even a handful of low-earning or zero-earning years pulled into that 35-year window can noticeably reduce your projected payout, which is one reason individual benefit statements vary so widely.

▸ What happens to delayed retirement credits if the higher-earning spouse dies before claiming at 70?

The delayed retirement credits don’t disappear — they effectively transfer to a surviving spouse through survivor benefits. A widow or widower is entitled to receive the amount the deceased would have collected, including any credits accumulated through delayed claiming up to the month of death. This makes delaying to 70 especially powerful for the higher-earning spouse in a two-income household, since it locks in a larger income floor for whoever is left. Surviving spouses can begin claiming as early as age 60, or age 50 if disabled, though filing before their own full retirement age will reduce the monthly survivor benefit proportionally.

Sloane Avery Wren

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