Enrollment · 2026
When can I sign up for Medicare?
Enter your birthday and we place your seven-month sign-up window, the first day coverage can start, and any General or Special Enrollment Period that applies.
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Written and maintained by Daniel SmithCalifornia, USA
| First sign-up window | 7 monthsThree months before your 65th birthday month, that month, and three months after. |
|---|---|
| Coverage if you sign up early | First day of your birthday monthApplies when you sign up during the three months before it. |
| Coverage if you sign up during or after | First day of the next monthCoverage never backdates more than the birthday-month rule. |
| Birthday on the first | Window shifts back one monthEligibility starts the month before your birthday month. |
| General Enrollment Period | January 1 to March 31The usual path if your first window has closed. |
| After job coverage ends | 8-month Special Enrollment PeriodStarts the month after your first window closes and runs through the eighth month after coverage ends. |
Your result
When you can sign up
Enter your birth month and year to see your sign-up window.
Enter your birth month and year
The calculator needs your birthday to place your seven-month enrollment window and your earliest possible coverage date.
When does Medicare coverage start
Coverage starts the first day of the month you sign up in, with one important exception: sign up during the three months before your 65th birthday month and coverage begins on the first day of that birthday month. Sign up in your birthday month or later and you wait until the first of the month after you apply.
That is why the dates in the calculator matter more than the enrollment window alone. Two people with the same birthday month can get different coverage start dates from the timing of a single sign-up.
Your initial enrollment period dates
In plain words, these Medicare sign-up dates depend only on your birthday. Your Initial Enrollment Period is seven months long: it opens on the first day of the third month before your 65th birthday month and closes on the last day of the third month after it. One rule shifts the whole window: if your birthday is on the first of the month, Medicare treats you as eligible the month before, which moves both dates back one month.
The window is fixed by your birthday, so the only decision inside it is when to act. This medicare enrollment calculator turns that decision into exact dates. Signing up in the first three months gives you coverage on time; waiting until the last three months usually delays the start date to the month after sign-up.
Special enrollment period dates
If you or your spouse are still working with employer group health coverage, you get a Special Enrollment Period that starts the month after your first sign-up window closes and runs through the eighth month after your employer coverage (or the job itself) ends, whichever comes first. Enter your coverage end month in the calculator to see those exact dates. When you are weighing when to enroll in Medicare against a job change or retirement date, that window is the number to check first.
The eight-month window is the practical reason many people can delay Part B without a penalty. The full rules, including what counts as employer coverage, are explained in the Special Enrollment Period while working guide.
General enrollment period dates
If your first window has closed and no Special Enrollment Period applies, the General Enrollment Period runs January 1 through March 31. You can sign up then, but coverage usually does not start until the first day of the month after you sign up, and a Part B late enrollment penalty may apply for the delay. The full mechanics are in the General Enrollment Period guide.
What changed for 2026 compared with 2025
| Rule | 2025 | 2026 |
|---|---|---|
| Standard Part B premiumWhat you start paying the month coverage begins, if you take Part B. | $185.00 | $202.90 |
| Part B deductibleThe amount you pay before Part B cost sharing starts. | $257.00 | $283.00 |
| Part A inpatient deductiblePer benefit period, and the same at every premium tier. | $1,676.00 | $1,736.00 |
| Enrollment window rulesThe window length and General Enrollment Period dates did not change. | 7 months, GEP Jan 1–Mar 31 | 7 months, GEP Jan 1–Mar 31 |
Worked examples
Three birthdays run through the same rule: find the month you turn 65, apply the first-of-the-month shift if it applies, then count three months before and three months after.
| Input or result | Born March 1961 | Born July 1, 1961 | Born October 1960 |
|---|---|---|---|
| Month you turn 65 | March 2026 | June 2026 | October 2025 |
| Window opens | December 1, 2025 | March 1, 2026 | July 1, 2025 |
| Window closes | June 30, 2026 | September 30, 2026 | January 31, 2026 |
| Earliest coverage | March 1, 2026 | June 1, 2026 | October 1, 2025 |
| What applies if the window has passed | General Enrollment Period January 1, 2027 to March 31, 2027 | General Enrollment Period January 1, 2027 to March 31, 2027 | General Enrollment Period January 1, 2027 to March 31, 2027 |
Source: Medicare.gov, sign up for Medicare and Social Security, when to sign up for Medicare, checked 2026-10-28.
MedicareClear is independent. We do not sell plans, rank carriers, or claim an official connection to Medicare.gov or any government agency.
What to do next
- Put your window dates in your calendar now. The reminder button above downloads a deadline file for any phone or desktop calendar.
- Decide about Part B while your window is open. If you are delaying because of job coverage, confirm the coverage qualifies and ask your benefits office when it ends.
- Enroll through Social Security, by phone at 1-800-772-1213, or in person. Have your Social Security number and employer coverage details ready.
- If your window has already closed, check the General Enrollment Period dates above and ask Social Security whether a Special Enrollment Period or a penalty exception applies to you.
Three honest caveats
- These dates come from your birthday, not from an official record. Social Security confirms the final dates when you apply, and a mismatch in your birthday or work history can move them.
- Whether employer coverage counts for a Special Enrollment Period depends on the size of the employer and how the plan works. If you are unsure, ask your benefits office and Social Security before you delay.
- Coverage start dates say nothing about cost. The Part B premium, the deductible, and any late penalty are separate numbers, calculated on the Medicare premium calculator.
Frequently asked questions
Can I sign up for Medicare before 65?
Your seven-month window opens three months before the month you turn 65, so for many people the sign-up window starts at 64. You cannot enroll in Parts A and B earlier than 65 unless you qualify through disability or a Special Enrollment Period.
How many months is the Medicare enrollment period?
Seven months: the three months before your 65th birthday month, your birthday month itself, and the three months after. If your birthday falls on the first, the whole window shifts back one month.
How soon does Medicare coverage start after I sign up?
If you sign up in the three months before your birthday month, coverage starts the first day of your birthday month. If you sign up during or after that month, coverage starts the first day of the month after you sign up.
What happens if I miss Medicare enrollment?
You wait for the General Enrollment Period, January 1 through March 31 of the next year, and coverage usually starts the month after you sign up. A Part B late enrollment penalty of 10% for each full year you delayed may then apply.
Do I have to sign up for Medicare at 65?
If you or your spouse are still working with employer group coverage, you can usually delay without a penalty, and you should tell the marketplace if you have marketplace coverage. If you are not covered that way, enrolling during your window avoids a permanent Part B penalty.
When does Medicare start if I sign up late?
In the General Enrollment Period, coverage usually starts the first day of the month after you sign up. With employer coverage, your Special Enrollment Period starts the month after your first window ends and runs through the eighth month after your job coverage ends.
Related help
Source table
| Figure | Value used | Official source |
|---|---|---|
| First sign-up window | 7 months around your 65th birthday | Social Security, when to sign upChecked |
| Coverage start rule | First of the birthday month if you sign up early, otherwise the first of the next month | Medicare.gov sign-upChecked |
| General Enrollment Period | January 1 to March 31 | Medicare.gov sign-upChecked |
| Special Enrollment Period | Starts the month after your first window ends; ends 8 months after employer coverage or the job ends | Medicare.gov, when coverage startsChecked |
| Where to apply | Social Security, 1-800-772-1213 | Social Security Medicare applicationChecked |
Cite this page
If you cite this page, use the reference below. It shows the date the figures were last checked so readers can judge whether they are current.
MedicareClear. “When can I sign up for Medicare?.” Figures checked October 28, 2026. https://medicareclear.top/calculators/medicare-enrollment-dates/
Print the checklist for a parent or keep a copy for your records. If a figure looks wrong, send the page and the official source you used.
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MedicareClear is independent and is not connected to Medicare.gov, Social Security, or any government agency. This page is educational and does not provide legal, tax, or insurance advice. Confirm your dates with Social Security before you act.
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