Why a Social Security Check at 68 Can Look $100 Short Before January Adjustments Kick In

She waited beyond full retirement age for a larger Social Security check, only to see a deposit that was about $100 lower than expected and no clear explanation from the agency about the missing amount.

Her first payment arrived in July, and she compared it with the estimate she had printed from the agency’s website. The estimate showed roughly $3,320 a month, while her actual benefit was based on $3,220. Because she had delayed claiming past full retirement age, she assumed she would receive the larger amount immediately, but the difference made it look as though $100 had been withheld.

That kind of mismatch often confuses new beneficiaries. On Quora, one person asked why the agency’s website says delayed retirement credits are paid in January after the year you apply when a letter seems to suggest otherwise. The credits are still part of the benefit, but some of them are added later.

How Delaying Benefits Increases the Monthly Check

Delayed retirement credits are the boost a person earns for each month they wait to claim after reaching full retirement age. For people born in 1943 or later, the increase is 2/3 of 1% per month, or 8% per year, and the credits stop accruing at age 70.

In this example, the woman was born on June 20, 1958. Her full retirement age is 66 years and 8 months, which she reached in February 2025. She began receiving benefits in June 2026, the month she turned 68, giving her 16 months of credits worth about 11%.

Why Part of the Increase Arrives Later

Social Security says that if a person starts benefits before age 70, some delayed retirement credits are not applied until January after benefits begin. The first payment includes credits through the end of the prior year. Credits earned in the year of filing begin showing up in January of the following year. The exception is age 70: if someone becomes entitled in the month they turn 70, that year’s credits start in that same month.

For her, the 11 credits from 2025 are already included. The five credits from January through May 2026 are still pending. That means about 31% of her credits are waiting, which is closer to one-third than half. For someone turning 68 in June, the June birthday leaves the largest share delayed, but still not as much as half.

If her full retirement age benefit, including cost-of-living increases, is $3,000, then all 16 credits would raise it to $3,320. With only the 2025 credits included, the payment comes to $3,220. That explains the $100 difference. The online calculator assumes all credits are applied, so it was never going to match her first check exactly.

Other Reasons a First Deposit May Be Smaller

• Medicare Part B. Once Social Security begins, the premium is usually deducted automatically. The standard premium is $202.90 a month in 2026. For single filers with income above $109,000, the IRMAA surcharge raises the total to $284.10 or more. If she previously paid Medicare separately, that expense has now shifted into her Social Security deposit.
• Voluntary tax withholding. If she filed Form W-4V, federal tax is withheld at 7%, 10%, 12%, or 22% of each payment.
• Payment timing. Benefits are paid in the month after they are due, so the June benefit arrived in July. Because her birthday falls between the 11th and the 20th, her payment is issued on the third Wednesday.

What to Check in the Award Letter

The award letter shows the starting monthly amount, but the January increase can be easy to overlook. It helps to confirm the month benefits begin, the amount before Medicare deductions, and whether the letter mentions credits counted only through December 2025.

If she calls 800-772-1213, she can ask a direct question: how many delayed credits are included in her current benefit, and will the five credits from 2026 be added effective January 2027? That should produce a clear answer.

Would Starting in January Have Changed the Outcome?

Beginning benefits in January avoids a delay in processing that year’s credits, since all credits from the previous calendar year have already been calculated. She would have had to claim in January 2026 with fewer credits, or wait until January 2027 and go seven more months without a check.

Her payments from June through December are about $100 lower each month at first, but Social Security later returns that missing $700 as a retroactive lump sum once the January recalculation is completed. After that, all 16 credits count toward her monthly benefit for the rest of her life, so the long-term amount does not change.

When the Bigger Payment Should Arrive

The higher amount begins with the January 2027 benefit. Because Social Security pays a month behind, that money would show up in February 2027 on her third Wednesday. A 3.6% cost-of-living increase for 2027 would raise it further, making the increase look larger than $100.

If she assumes the smaller payment is an error and withdraws extra money from an IRA to make up the difference, that could create another issue. IRA withdrawals count as income and may push her into a higher Part B premium bracket. If the February deposit still does not include the five 2026 credits, it would be time to call again.