Retirement Age Calculator: Your Key Dates

Five dates carry most of the money: the first month you can claim Social Security at 62, Medicare eligibility at 65, your full retirement age (66 to 67, depending on birth year), age 70 when Social Security stops growing, and the year your required minimum distributions begin (73, or 75 if you were born in 1960 or later). Around them sit a dozen smaller rules that open or close a tax door: catch-up contributions at 50, the rule of 55, penalty-free withdrawals at 59½, the larger catch-up from 60 to 63, the income year that sets your first Medicare premiums, and charitable giving from an IRA at 70½.

Most of these rules turn on a birth year, but several turn on the exact day. Social Security and Medicare say you reach an age on the day before your birthday, so a person born on the 1st of a month reaches it in the previous month (SSA POMS GN 00302.400). The IRS counts the half-year ages as six calendar months after the birthday (final RMD regulations, IRB 2024-33), and treats you as 65 for tax purposes on the day before your 65th birthday (IRS Publication 554). The calculator above applies each rule as the agency that owns it writes it, which is why it asks for the day as well as the month and year.

66 if you were born from 1943 through 1954, rising two months a year to 67 for anyone born in 1960 or later. If you were born on January 1, Social Security uses the previous year; if you were born on the 1st of any month, it figures your full retirement age as if your birthday were in the previous month (SSA). The table gives the key ages for each birth year from 1945 to 1970, computed by the same rules the calculator uses.

Reductions from the SSA formula: 5/9 of 1% a month for the first 36 months before full retirement age and 5/12 of 1% for each month beyond; a spouse's benefit is cut 25/36 of 1% a month for the first 36 (SSA; SSA). Born in 1949: RMD age 70½ if born before July 1, 72 if born on or after it. RMD ages from the final regulations (IRB 2024-33); the proposed rules published with them set 73 for anyone born in 1959.

Full retirement age is when three things happen at once. Your own benefit is paid in full. The earnings test stops: before full retirement age, Social Security withholds $1 of benefits for every $2 you earn above $24,480 in 2026, or $1 for every $3 above $65,160 in the year you reach it, and from the month you reach it your earnings no longer reduce benefits at all (SSA, 2026). And a spousal benefit reaches its maximum, half of the worker's full-retirement-age amount; it is reduced if the spouse starts earlier and does not grow if the spouse waits longer (SSA).

The first month you are 62 for the entire month (SSA). Because you reach 62 the day before your birthday, anyone born on the 1st or 2nd of a month is 62 for all of their birth month and can start then; everyone else starts the month after. For someone born in 1960 or later, starting at 62 cuts the benefit by 30% for life, and the cut is smaller for earlier birth years, as the table shows.

Waiting pays until 70 and then stops. Each month you delay past full retirement age adds 2/3 of 1%, or 8% a year, for anyone born in 1943 or later, and the increase stops when you reach 70 (SSA). There is no reason to wait beyond the month you turn 70, and if you have already reached full retirement age, Social Security can pay up to six months of back benefits, which also gives up the credits for those months. The calculator shows both ends of the range for each of you: the first month at 62 and the month delayed credits stop. Which month to choose in between is a larger question, covered in our guide to when to claim Social Security and the Social Security estimator.

Medicare can start on the first day of the month you turn 65, if you sign up in the three months before it. Your Initial Enrollment Period lasts seven months: the three months before the month you turn 65, that month, and the three months after. Sign up in your birthday month or later and coverage starts the month after you sign up (Medicare.gov). The birthday rule applies here too: if you were born on the 1st, you turn 65 for Medicare purposes in the previous month, so both the enrollment window and coverage start a month earlier (SSA POMS HI 00805.015; HI 00805.153). Someone born May 1 is first eligible in April.

Missing the window is expensive. If you do not sign up for Part B when first eligible and have no qualifying employer coverage, you pay an extra 10% of the Part B premium for each full 12-month period you could have had it, for as long as you have Part B. The Part D penalty is 1% of a base premium for each month without creditable drug coverage (Medicare.gov). If you or your spouse are still working and covered by that employer's group plan, you can usually delay Part B without penalty and sign up when the work or the coverage ends (Medicare.gov).

Why do HSA contributions have to stop?

Beginning with the first month you are enrolled in any part of Medicare, your HSA contribution limit is zero, and the rule applies to retroactive coverage (IRS Publication 969). That matters because premium-free Part A taken after 65 is backdated up to six months from when you sign up or apply for Social Security, though never earlier than the month you turned 65 (Medicare.gov). Medicare's own advice is to stop HSA contributions six months before you apply (Medicare.gov). Starting Social Security after 65 enrolls you in Part A, so the same backdating applies to anyone who works past 65 with an HSA and then claims. Until then, the $1,000 HSA catch-up from age 55 still applies. Our HSA guide and Medicare enrollment guide go further.

The tax year two years before. To set 2026 premiums, Social Security generally uses the return filed in 2025 for tax year 2024 (SSA). So for most people the income of the year they turn 63 decides whether they pay an income-related surcharge (IRMAA) on Part B and Part D in the year they turn 65. In 2026 the first surcharge applies above $109,000 of modified adjusted gross income for a single filer or $218,000 for a joint return, and each tier is a cliff (CMS, 2026).

That makes 63 a planning year, not a quiet one. A large Roth conversion, a business sale or a big capital gain at 63 shows up in the first Medicare bill at 65. If income then falls because you stopped working, Social Security will recalculate from a more recent year when you file Form SSA-44 for a life-changing event such as work stoppage (SSA). For a couple, the joint return counts for both spouses, so the older spouse's lookback year is also a year of the younger spouse's working life. The calculator marks the lookback year for each of you. The healthcare cost estimator lists every tier.

Four, and each is worth knowing before the year it arrives. From the calendar year you turn 50, you can add a catch-up of $8,000 to a 401(k), 403(b) or governmental 457(b), and $1,100 to an IRA (2026 limits; IRS Notice 2025-67). In the calendar years you turn 60, 61, 62 and 63, the plan catch-up rises to $11,250; the year you turn 64 it drops back. From 2026, if your prior-year wages from that employer were above $150,000, catch-ups must go in as Roth contributions.

At 55 two things open. The HSA catch-up of $1,000 applies if you are 55 or older at the end of the year and not on Medicare, and each spouse must put their own catch-up in their own HSA (IRS Publication 969). And under the rule of 55, if you leave your employer in or after the calendar year you turn 55, withdrawals from that employer's plan escape the 10% additional tax (IRS). The rule covers that plan only, not IRAs, so rolling the plan into an IRA before you need the money gives the exception up.

At 59½ the 10% additional tax stops applying to IRAs and plans alike (IRS). The calculator gives the exact date as six calendar months after your 59th birthday, the same count the IRS regulations use for 70½; a withdrawal a week early is taxed as early. Our guide to maxing out a 401(k) covers the catch-up rules in detail.

At 65 the standard deduction grows. The IRS treats you as 65 for a tax year if your 65th birthday falls on or before January 1 of the next year (IRS Publication 554), so a January 1 birthday counts for the year before. In 2026 the additional amount is $1,650 per spouse 65 or older on a joint return, or $2,050 if you are unmarried. On top of it, a separate senior deduction of $6,000 per person 65 or older applies from 2025 through 2028, reduced by 6% of income above $75,000 ($150,000 joint). The calculator shows it only for the years it exists.

They overlap, and the overlaps are where the decisions are. A spouse can collect a spousal benefit only once the worker has filed for their own, and it is largest at the spouse's own full retirement age (SSA). A surviving spouse can start survivor benefits from the month they reach 60, at about 71.5% of the worker's benefit, rising to 100% at the survivor's full retirement age (SSA). Survivor benefits do not require being 60 for the whole month; entitlement can begin in the month the age is reached (SSA POMS RS 00207.001).

Medicare is individual. When the older spouse turns 65, the younger one gets nothing from it. If the younger spouse was covered through the older spouse's job and that job ends, they need other coverage until their own 65th birthday month: COBRA, a retiree plan, or a Marketplace policy. The same split applies to HSAs: once one spouse enrolls in Medicare, that spouse stops contributing, while the other can continue to their own HSA if still covered by a high-deductible plan.

Taxes stay joint. On a joint return, both spouses' income counts toward each spouse's IRMAA test, each spouse 65 or older adds their own additional deduction and senior deduction, and each spouse has their own RMD start year and their own $111,000 QCD limit. The calculator merges both timelines into one list so these overlaps show up in order.

RMDs start at 73, or 75 if you were born in 1960 or later (SECURE 2.0). Under the final regulations the age is 70½ if you were born before July 1, 1949, 72 if you were born from July 1, 1949 through 1950, 73 for 1951 through 1959, and 75 for 1960 or later (IRB 2024-33). Your first RMD is for the calendar year you reach that age and may be delayed until April 1 of the following year; every later RMD is due by December 31 (IRS RMD FAQs).

The trap is that delaying the first RMD does not delay the second. Take the first on April 1 and the second is still due by December 31 of the same year, so two years of taxable RMDs land in one tax year, and two years later in one year of Medicare premiums. For most readers with sizable IRAs, taking the first RMD in the year it is for is the better choice. If you are still working at RMD age and own less than 5% of the employer, that employer's plan can usually wait until you retire; IRAs cannot (IRS RMD FAQs).

Two earlier dates make RMDs smaller. Qualified charitable distributions begin at 70½, years before RMDs: up to $111,000 a year in 2026 can go straight from an IRA to charity without being taxed, and once RMDs start, the gift counts toward them (IRS Publication 590-B). And the years between retiring and the first RMD are usually the cheapest time to convert part of an IRA to a Roth. See Roth conversions before RMDs, qualified charitable distributions and the RMD calculator.

Illustrative example: the people and figures below are hypothetical, not real clients. Numbers are calculated from the stated assumptions.

The calculator opens on Paul, born May 14, 1962, and Diane, born September 3, 1964. Paul reached 59½ on November 14, 2021 and could have started Social Security in June 2024 at a 30% reduction; he is waiting. He turned 60 in 2022, before the larger catch-up existed, so it applied to him only in 2025, the year he turned 63. Diane turned 60 in 2024 and gets it for 2025, 2026 and 2027.

Paul's Medicare window runs from February 2027 to August 2027, with coverage from May 1, 2027 if he signs up by the end of April. His IRMAA lookback year is 2025, a year already over, so any Roth conversion or large gain they took that year is already built into his first premiums. Diane will be 62 when Paul's Medicare starts and not eligible herself until September 2029, a gap of 28months. If Diane is on Paul's employer plan, the date Paul retires decides how she is insured for those months. Their joint income in 2027will set Diane's first premiums.

Paul reaches full retirement age of 67 in May 2029 and 70 in May 2032. If he waits to 70 and dies first, Diane inherits the larger, delayed benefit as a survivor. Paul gets the senior deduction for 2027 and 2028; Diane turns 65 after it ends unless Congress extends it. Both were born after 1959, so their RMDs start at 75: Paul's first is for 2037 (due by April 1, 2038), Diane's for 2039. Paul can begin QCDs on November 14, 2032, more than four years before his first RMD, and Diane on March 3, 2035.

• Dollar amounts. It gives dates, not benefits. For the size of each Social Security option, use your statement at ssa.gov or the Social Security estimator.
• Disability, and survivors with children. Survivor benefits from 50 for a disabled widow or widower and benefits for a spouse caring for a young child follow different ages. Survivors also have their own full retirement age.
• Public-safety and special plan rules. The early-withdrawal exception starts at 50 for qualified public safety employees, and 457(b) plans have their own withdrawal rules.
• Employer coverage past 65. If you keep a large-employer group plan, your real Medicare deadline is the end of that coverage, not your Initial Enrollment Period.
• Inherited accounts and state rules. Inherited IRAs follow a different schedule, and some states set their own ages for pension and income-tax breaks.
• Future law. Dollar limits are 2026 figures and change each year; the ages reflect current law and the senior deduction ends after 2028 unless extended.