If you were born in 1960 or later, age 67 is your full retirement age for Social Security, meaning it is the age at which you can collect 100% of the monthly benefit you have earned with no reduction. Reaching that birthday changes several things at once: the earnings test ends, delayed retirement credits begin accruing, Medicare enrollment rules matter differently depending on whether you kept working, and Health Savings Account contributions have to stop once any part of Medicare kicks in. Each has real dollar consequences, and most of them are permanent once set.
What Full Retirement Age Actually Means
Full retirement age is the benchmark the Social Security Administration uses to decide whether your monthly check is reduced, paid in full, or increased. At 67, you receive your Primary Insurance Amount, which SSA calculates from your highest 35 years of earnings adjusted for wage inflation.1Social Security Administration. Social Security Retirement Benefit Calculation Worked fewer than 35 years? The missing years count as zeros and pull the average down.
The 1983 amendments to the Social Security Act moved this threshold from 65 to 67 in stages, and the phase-in is now complete for everyone born in 1960 or later.2Social Security Administration. Retirement Age and Benefit Reduction Claiming at exactly 67 gets you your full benefit with no penalty and no bonus. Every other claiming decision is measured against that number.
Claiming Before or After 67
You can start Social Security as early as 62, but the cut is steep. SSA reduces your benefit by five-ninths of one percent for each of the first 36 months before full retirement age, then by five-twelfths of one percent for each additional month. Sixty months of early claiming works out to a 30% permanent reduction.3Social Security Administration. Early or Late Retirement Someone entitled to $2,000 a month at 67 would get $1,400 a month for life by filing at 62. That reduction never expires.
Waiting past 67 does the opposite. Each month of delay adds two-thirds of one percent to your benefit, which comes out to 8% a year.4Social Security Administration. Delayed Retirement Credits Credits stop accruing at age 70, so the maximum boost is 24% above your age-67 benefit. There is no financial reason to wait past 70. For a full benefit of $2,500 at 67, delaying to 70 pushes it to roughly $3,100 for life. The trade-off is giving up three years of checks in exchange for a bigger check afterward, and whether it makes sense depends mostly on your longevity and other income.
The Six-Month Retroactive Lump Sum
Once you are past full retirement age, Social Security lets you claim a lump sum covering up to six months of back payments when you file.4Social Security Administration. Delayed Retirement Credits This is not available before 67. The catch matters: those retroactive months move your benefit start date back, so you forfeit the delayed retirement credits you earned during that stretch. Six months of retroactive pay costs about 4% off every future monthly check. Most people do not notice the trade-off until after they have signed for the lump sum.
The Earnings Test Ends
Before full retirement age, working while collecting Social Security can cost you benefits. In 2026, if you are under full retirement age for the whole year, SSA withholds $1 for every $2 you earn above $24,480. In the year you reach 67, the limit rises to $65,160 and the withholding drops to $1 for every $3 above it, applied only to earnings in the months before your birthday month.5Social Security Administration. Receiving Benefits While Working
Starting the month you reach 67, the earnings test disappears. You can earn any amount from a job, self-employment, or a business without losing a dollar of your benefit. If you plan to keep working past 67, this is one of the clearest financial advantages of hitting that milestone. Money withheld in earlier years is not lost either; SSA automatically recalculates your benefit at full retirement age to credit you for months that were reduced, spreading the recovery across future payments.6Social Security Administration. Exempt Amounts Under the Earnings Test
Your Benefit Can Still Be Taxed
Reaching full retirement age does nothing to shield your Social Security check from federal income tax. Whether yours is taxable depends on your combined income, which the IRS defines as your adjusted gross income, plus tax-exempt interest, plus half of your Social Security benefits. The thresholds have never been adjusted for inflation, so more retirees cross them every year.
For single filers:7Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits
- Combined income under $25,000: none of your benefits are taxable.
- $25,000 to $34,000: up to 50% of your benefits may be taxable.
- Above $34,000: up to 85% of your benefits may be taxable.
For married couples filing jointly:7Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits
- Combined income under $32,000: none of your benefits are taxable.
- $32,000 to $44,000: up to 50% of your benefits may be taxable.
- Above $44,000: up to 85% of your benefits may be taxable.
The phrase “up to 85%” means up to 85% of your benefit can be counted as taxable income, not that you pay an 85% tax rate. Your actual bill depends on your marginal bracket. Someone at 67 combining Social Security with a pension, 401(k) withdrawals, or part-time earnings can land in the higher tier easily. A handful of states also tax benefits at the state level, so check your state’s rules before you plan around a net figure.
Medicare at 67 If You Delayed Enrollment
Most people enroll in Medicare at 65. If you kept employer coverage past that point and put off Part B, the rules for enrolling later without a lifetime penalty are unforgiving.
Part B Special Enrollment Period
Delaying Part B because you had group health coverage through your own or your spouse’s current employer gives you an eight-month Special Enrollment Period starting the month after that employment or coverage ends, whichever comes first.8Social Security Administration. How to Apply for Medicare Part B During Your Special Enrollment Period Enroll inside that window and there is no penalty. Miss it and the surcharge is permanent.
The Part B late enrollment penalty adds 10% to your monthly premium for every full 12 months you were eligible but did not sign up. In 2026, the standard Part B premium is $202.90 per month.9Medicare.gov. Avoid Late Enrollment Penalties Two years without signing up and without a qualifying Special Enrollment Period means a 20% surcharge on top of that premium for as long as you have Part B.
To use the Special Enrollment Period, you will need Form CMS-L564, which your employer completes to verify your group health plan coverage and employment dates.10Centers for Medicare & Medicaid Services. Request for Employment Information Start that paperwork before your last day of coverage. If HR moves slowly and you miss the eight-month window, the penalty is still on you.
Part D Prescription Drug Coverage
Part D has its own penalty. Go 63 or more consecutive days without creditable prescription drug coverage after first becoming eligible for Medicare and you will owe extra when you enroll. Creditable coverage means the plan is expected to pay at least as much as a standard Medicare drug plan, and most employer plans qualify. Your employer must notify you each year whether yours does.9Medicare.gov. Avoid Late Enrollment Penalties
The Part D penalty is 1% of the national base beneficiary premium for each full month you lacked creditable coverage. In 2026, the base premium is $38.99, so each uncovered month adds about $0.39 to your monthly Part D premium permanently.11Medicare.gov. How Much Does Medicare Drug Coverage Cost A two-year gap works out to about $9.36 extra every month for life.
Part A When You Are Short on Work Credits
Most people get Part A premium-free because they or their spouse paid Medicare taxes for at least 40 calendar quarters, roughly 10 years of work. Fall short and you will pay a monthly premium for Part A that can reach $565 in 2026.12Medicare.gov. 2026 Medicare Costs If you are close to 40 quarters at 67, working long enough to cross the line can be worth it.
Stop HSA Contributions When Medicare Starts
If you have been funding a Health Savings Account through a high-deductible health plan at work, Medicare enrollment forces a hard stop. The IRS sets your HSA contribution limit to zero beginning the first month you are enrolled in any part of Medicare, including Part A alone.13Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans Contributions after that date are excess contributions and carry a 6% excise tax for each year they stay in the account.
This trips people up because Medicare coverage can be backdated when you apply after 65. Contributions made during a retroactive coverage period become excess retroactively. The safer approach is to stop HSA contributions a few months before you plan to enroll to build in a buffer. Existing HSA funds stay usable tax-free for qualified medical expenses, including Medicare premiums and out-of-pocket costs, whenever you enrolled.