Updated October 18, 2026. Quick answer: Form SSA-1-BK is the Application for Retirement Insurance Benefits. You can apply up to four months before you want benefits to start, as early as age 62 with a reduced benefit. Item 22 asks which start month you want, and the form carries Medicare enrollment questions. Social Security’s booklet lists online, phone and office appointments as the ways to apply.
Quick reference
| Item | As stated by Social Security |
|---|---|
| What the form is | Application for retirement insurance benefits (Title II and Medicare Part A) |
| Earliest age | Age 62, with a reduced benefit (about 30% lower for someone turning 62 in 2026 whose full retirement age is 67) |
| How early to apply | Up to 4 months before you want benefits to start |
| Delay past full retirement age | 8% more for each full year, until age 70 |
| Start month | Item 22: earliest month with reduction, no-reduction option, or a chosen month |
| Medicare | Information block plus the Part B question for people near 65 |
What the application covers
The form opens with “I apply for all insurance benefits for which I am eligible under Title II (Federal Old-Age, Survivors, and Disability Insurance) and Part A of Title XVIII (Health Insurance for the Aged and Disabled) of the Social Security Act, as presently amended.” Its supplement note says a person who has already completed the spouse’s application needs only the circled items. The questions run through identity, citizenship, marital history, children, work history, expected earnings, the start-month choice, Medicare and direct deposit.
When to apply and how the age affects the amount
The retirement booklet says “You can apply up to four months before you want your retirement benefits to start.” “You can apply for retirement benefits online at www.ssa.gov, call our toll-free number, or contact a local Social Security office to make an appointment.”
On age it says “You can receive Social Security retirement benefits as early as age 62. However, we’ll reduce your benefits if you start receiving them before your full retirement age.” “For example, if you turn age 62 in 2026, your benefit would be about 30% lower than it would be at your full retirement age of 67.” After full retirement age, “We’ll add 8% to your benefit for each full year you delay receiving Social Security benefits beyond full retirement age.”
Item 22 and the start month
Item 22 gives three choices: “I want benefits beginning with the earliest possible month, and will accept an age-related reduction.” or “I am full retirement age (or will be within 12 months), and want benefits beginning with the earliest possible month providing there is no permanent reduction in my ongoing monthly benefits.” or a month you write in. Our claiming age calculator and Social Security timing pages show how the choice changes the monthly amount.
The work questions ask, for each month of last year, this year and next year in which you did not earn above the monthly limit shown in the instructions, you mark an exempt month. That ties to the earnings test.
Medicare and an inconsistency to check
The form’s Medicare block says that anyone still entitled at 65 could “automatically receive Medicare Part A (Hospital Insurance) and Medicare Part B (Medical Insurance) coverage at age 65.” It states the late penalty: “Your monthly premium for Part B may go up 10% for each full 12-month period that you could have had Part B, but did not sign up for it.”
The same paragraph says that after the January 1 to March 31 General Enrollment Period, “coverage will start July 1 of that year.” Social Security’s 2026 Medicare booklet says the opposite: “Your coverage starts the first day of the month after you sign up.” The two are the agency’s own documents. If your date matters, ask Social Security which one applies to you. See Form CMS-40B for the Part B request itself.
The edition read for this page is Form SSA-1-BK (07-2025) as the agency served it on 2026-10-18. Check the edition printed on the copy you send, because a later edition can change the questions, the mailing instructions and the evidence asked for.
Common mistakes
- Applying earlier than four months before the month you want benefits, or after you meant to start.
- Picking the earliest month by default. Item 22 states the reduction, and about 30% lower at 62 is the booklet’s example for someone with a full retirement age of 67.
- Skipping the exempt-months questions if you are still working. They feed the earnings test.
- Relying on the form’s July 1 wording without checking, since the Medicare booklet describes a different start rule for the General Enrollment Period.
Related: Form SSA-2, Form SSA-521, claiming at 62 versus 67, and Social Security and Medicare forms.
Sources
- Form SSA-1-BK (07-2025), Application for Retirement Insurance Benefits: https://www.ssa.gov/forms/ssa-1-bk.pdf
- SSA Publication 05-10035 (2026), Retirement Benefits: https://www.ssa.gov/pubs/EN-05-10035.pdf
- SSA Publication 05-10043 (2026), Medicare: https://www.ssa.gov/pubs/EN-05-10043.pdf
Read from the Social Security Administration and Centers for Medicare and Medicaid Services documents linked above on October 18, 2026. General information, not legal or benefits advice. Your own facts decide the outcome, and Social Security at 1-800-772-1213 is the right place to confirm anything consequential.