When Your Birthday Isn’t Your Birthday (According to Social Security)
Social Security benefits and birthdays go hand in hand, but for those born on certain specific days of the year, bureaucracy can add an interesting twist to such a simple concept.


There are a couple of circumstances where the Social Security Administration changes your birthdate for you. Chances are if this applies to you, you already know this, but I thought I’d explain it anyhow just so you’ll know what it’s all about.
First of the Month
If your date of birth falls on the first day of the month, then for Social Security purposes, your Birth Month is actually the month prior to your actual date of birth. So, if you were born on July 1, according to the Social Security Administration, your Birth Month — and therefore the month that your benefit is based upon (for example, Full Retirement Age) — is June. In this example, your Birth Year remains the same, but that’s not always the case … as you’ll see below.
First of January
In the case of a date of birth being Jan. 1, your Birth Month is December, and your Birth Year is the year prior to your actual birth.

Sign up for Kiplinger’s Free E-Newsletters
Profit and prosper with the best of expert advice on investing, taxes, retirement, personal finance and more - straight to your e-mail.
Profit and prosper with the best of expert advice - straight to your e-mail.
Twenty-ninth of February
If you are one of the lucky ones who happens to have been born on Leap Day, meaning Feb. 29, don’t worry! Even though your birthday only comes once every four years, your benefits won’t be affected. The Social Security Administration doesn’t really care what day of the month you were born on, only the month and year. So even though your actual date of birth anniversary doesn’t come every year, the month does, and the Social Security Administration counts February as your Birth Month in your case.
The Bottom Line
When it comes to Social Security, nothing is simple — even your birthday. Make sure you understand all the rules before making your benefit decisions.
Get Kiplinger Today newsletter — free
Profit and prosper with the best of Kiplinger's advice on investing, taxes, retirement, personal finance and much more. Delivered daily. Enter your email in the box and click Sign Me Up.

Jim Blankenship of www.BlankenshipFinancial.com is a practicing fee-only financial planner, author and speaker, in New Berlin, Illinois. He has written three books, including the popular "Social Security Owner's Manual." Jim focuses extensively on Social Security, retirement plans and income taxes in writings on the blog www.FinancialDucksInARow.com.
-
Think a Repeal of the Estate Tax Wouldn't Affect You? Wrong
The wording of any law that repeals or otherwise changes the federal estate tax could have an impact on all of us. Here's what you need to know, courtesy of an estate planning and tax attorney.
-
In Your 50s? We Need to Talk About Long-Term Care
Many people don't like thinking about long-term care, but most people will need it. This financial professional recommends planning for these costs as early as possible to avoid stress later.
-
Social Security Pop Quiz: Are You Among the 89% of Americans Who'd Fail?
Shockingly few people have any clue what their Social Security benefits could be. This financial adviser notes it's essential to understand that info and when it might be best to access your benefits.
-
Such Attractive Yields in High-Grade Munis Are Rare and May Not Last Long
According to this munis expert, the last time munis were this cheap was a brief period in 2023. If you kicked yourself for missing out then, you have a second chance now.
-
Financial Analyst Sees a Bright Present for Municipal Bond Investors
High-tax-bracket investors have an excellent opportunity to secure low-volatility, high-quality returns at yield levels rarely seen in over a decade.
-
I'm an Insurance Pro: How Not to Get Dumped by Your Insurance Agent
Your insurance agent or broker might show you the door if you do any of these five things. Being a good customer is about more than paying your bill on time.
-
Two Estate Planning Issues You Should Never Overlook
This estate planning attorney explains why proper asset titling and beneficiary designations make a big difference when it's time to transfer your wealth.
-
The Four D's That Could Force You to Sell Your Business
Business owners (or their heirs) can be rushed into a sale of their company if they haven't planned for a major change in circumstances — or the four D's.