Medicare Timing Tool
Initial Enrollment Period Calculator
Your Initial Enrollment Period (IEP) is the window of time in which you can sign up for Medicare Part A and Part B. The IEP is a 7-month period around your 65th birthday month.
*This tool is an estimate only and may not be exact
Your Medicare Enrollment Timeline
Your 7-Month Initial Enrollment Period
Already getting Social Security or RRB benefits? If you're drawing benefits at least 4 months before you turn 65, Medicare generally enrolls you automatically in Part A and Part B if you live in the United States (except Puerto Rico). If you live in Puerto Rico, Part A is automatic but you must sign up for Part B. Medicare generally mails your welcome packet and card about 3 months before your Medicare coverage starts. See the section below for what that means for your Part B and TRICARE For Life.
When Your Coverage Starts Based on Enrollment
⚠️ Warning: Missing Your IEP
If you miss your Initial Enrollment Period and don't have creditable employer coverage, you face a permanent 10% penalty for every 12-month period you delay. This penalty applies to your Part B premium for life and grows as premiums increase.
Important: VA health benefits and TRICARE For Life do not by themselves provide the employer-coverage Special Enrollment Period for Part B. If you or your spouse (or, in some disability situations, a family member) are covered by a group health plan based on current employment, you may qualify to delay Part B without a late-enrollment penalty; employer size and your situation affect which coverage pays first. Confirm your circumstances with Social Security or Medicare before delaying Part B.
Automatic Enrollment
Already Getting Social Security? Medicare Comes to You.
Not everyone has to sign up for Medicare. If you're already drawing benefits when you approach 65, the government enrolls you on its own. Here is what that looks like — and the one decision veterans need to get right.
You're Enrolled Automatically
If you receive Social Security or RRB benefits at least 4 months before turning 65, Medicare generally automatically enrolls you in Part A and Part B if you live in the United States (except Puerto Rico). If you live in Puerto Rico, Part A is automatic but you must sign up for Part B. If you live outside the U.S., check the applicable enrollment rules. If you need TRICARE For Life, you must have both Part A and Part B.
Your Card Arrives Early
Medicare mails your welcome packet and red, white, and blue card about 3 months before coverage starts. Part A and Part B begin the first day of your birthday month — or the month before, if you were born on the 1st.
On Disability? Same Rule
If you've been receiving Social Security disability (SSDI) payments, Medicare enrolls you in Part A and Part B automatically in your 25th month of benefits — even before age 65.
Veterans: Think Before You Turn Down Part B
Part B has a monthly premium, so you're allowed to turn it down. But if you have TRICARE For Life, you must keep Part B — drop it and you lose TFL. VA health benefits don't count as creditable coverage either, so declining Part B can trigger a lifelong penalty. Talk to someone who works with veterans before you decide.
Sources: Medicare.gov, SSA.gov & TRICARE.mil — "How do I sign up for Medicare?" and "TRICARE For Life & Turning 65"
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How the Initial Enrollment Period Works
7-Month Window
Your IEP is a 7-month period: 3 months before your 65th birthday month, your birthday month, and 3 months after. Enroll early for the best coverage start date.
Coverage Start Dates
Enroll in the first 3 months = coverage starts the 1st of your birthday month. Wait until your birthday month or later = coverage is delayed.
VA Coverage Doesn't Count
VA health benefits do not by themselves provide the employer-coverage Special Enrollment Period for Part B. Current-employment group health coverage through you or your spouse may qualify you to delay Part B; confirm your circumstances with Social Security or Medicare.
SSDI Recipients: Special Rule
If you received Medicare before 65 through SSDI, any Part B penalty completely resets to zero when you turn 65.
Source: Medicare.gov — "Initial Enrollment Period"