Moving Back to the US: The 50% Part B Penalty, the 60-Day Insurance Window, and Six Other Clocks

Moving back to the US after five years abroad past 65 without Medicare Part B adds 50% to that premium, and for most people it never comes off. At the 2026 standard rate of $202.90 a month, that’s $101.45 extra every month, or $1,217.40 a year, starting the day your coverage does.

That’s the rule that surprises people most. Not the only one. There are about eight clocks that start, stop or quietly keep running when an American comes home, and no single office tells you about the others.

I live in Spain, and Spain is home for now. But the way back is the move almost nobody researches in advance, so I checked each line below against the official pages in September 2026.

Medicare Part B: the clock that follows you abroad

Medicare barely works outside the country, so skipping or dropping Part B abroad is tempting. Social Security’s own booklet for people overseas says it “may not be to your advantage” to pay the premium if you’ll be away for a long time.

The same paragraph has the catch. Sign up later and your premium goes up 10% for each 12-month period you could have been enrolled and weren’t. Medicare’s page on late-enrollment penalties adds the part people miss: the penalty isn’t a one-time fee. It’s usually charged for as long as you have Part B, which for most people means the rest of their life.

The penalty is a percentage, so the dollars rise whenever the premium does.

Now the timing, which bites harder than the money.

Living abroad isn’t one of Medicare’s Special Enrollment Periods for Part B. Volunteering abroad is. Retiring to the coast of Portugal isn’t. So most people who come home wait for the General Enrollment Period, January 1 to March 31, and coverage starts the month after they sign up.

Land on May 1, sign up on January 2, and Part B starts February 1. That’s May through January with nothing paying the doctor.

Nine months.

And the penalty clock keeps running while you wait.

There are two ways to shrink that gap. Plan to land between January and March, when you can sign up straight away. Or keep Part B running for your last year or two abroad. That’s a judgment call about your own money, and whether Medicare covers you abroad goes through the trade-off.

One smaller window: once you’re back, you can join a Medicare Advantage or drug plan within 2 full months after the month you move. Miss it and you wait for the fall enrollment season, October 15 to December 7.

Under 65: a 60-day window, and no proof of past coverage

For anyone not yet on Medicare, the Marketplace is the default landing pad, and the rule is friendlier than people expect.

Moving to the US from a foreign country is a qualifying life event, and you usually have 60 days from the move to pick a plan. Normally a move only counts if you had qualifying coverage for at least one day in the 60 days before it. The CMS summary of Special Enrollment Periods lists the exception that matters here: it doesn’t apply if you were living in a foreign country for at least one of those 60 days. Your Spanish or Mexican policy doesn’t have to count as anything.

Day 61 is different. Miss the window and you can’t enroll until the next Open Enrollment, unless something else qualifies you.

Keep the boarding pass, the lease or a utility bill showing your new address and move date. The Marketplace can ask for proof.

One wrinkle for couples on either side of 65. Once someone has Medicare Part A, they don’t qualify for savings on a Marketplace plan. The 64-year-old gets the Marketplace. The 66-year-old gets the Medicare calendar above. Same house, two systems.

What doesn’t restart

Some things come through the years abroad untouched. Worth knowing which, so you don’t spend a week proving things nobody’s asking about.

Your Social Security work record. Retirement benefits need 40 credits over your working life, and there’s no recent-work test for retirement. In 2026 one credit takes $1,890 of covered earnings, so a year of US work at $7,560 or more earns the maximum four.

Disability coverage is the exception. It has a recent-work test. Years abroad with no US-covered earnings can take you out of it, and getting back in takes new US work.

Part A. If you earned it, it’s there. The Social Security booklet says Part A becomes available to you when you return.

State residency starts from zero

You were a resident of somewhere when you left. Not anymore. That residency is almost certainly gone, and in-state tuition is where families feel it first.

• California: the University of California wants a permanent home in the state for at least one year before the residence determination date, and its 2026-27 guidelines define one year as 366 days. Intent to stay has to be shown too.
• Texas: in most cases, the student or a parent must have lived in Texas as their permanent home for 12 consecutive months right before the semester.

If you have a teenager, start that clock first. Land in August and your kid probably pays out-of-state rates for the first year at a public university in either state. Other states set their own rules. Check with yours.

Your credit file: stale, not gone

Years away don’t erase a credit report. It goes quiet, and that has a name. The Consumer Financial Protection Bureau describes two ways a file becomes unscorable: too little history, or a file gone “stale” because nothing new has been reported. Close your US cards, pay everything from a foreign account for six years, and you can land with a clean record and no score.

• Pull your reports from all three bureaus at AnnualCreditReport.com before you sign a lease. It’s free.
• If you still can, keep one US card open while you’re abroad. A small charge on autopay keeps the file alive.
• Expect a secured card or a co-signer in the first months.

The flip side: most late-payment history can be reported for seven years, and bankruptcies for up to ten. Time abroad doesn’t pause that clock.

The tax return for the year you come back

The foreign earned income exclusion is $132,900 for 2026, but only if you qualify for the whole year. The IRS page on figuring the exclusion says a part-year qualifier multiplies the maximum by their qualifying days and divides by 365.

Come back on July 1, 2026, and you have 181 qualifying days that year. Your cap drops to about $65,905. Anything you earn after landing can’t be excluded. None of it.

Three smaller points:

• The physical presence test needs 330 full days abroad in any 12 consecutive months, and that window can start in the previous year.
• If your foreign accounts together topped $10,000 at any point in the year, the FBAR is still due: April 15, with an automatic extension to October 15.
• The state you move to may want a part-year resident return. Read its revenue department’s page before spring.

If the year is messy, with a foreign pension, a house sale abroad and two countries’ returns, an hour with a preparer who handles expat returns is cheap. I don’t have an arrangement with any preparer or insurer.

Moving back to the US: the order I’d do it in

The address change matters more than it looks. It feeds your Medicare mail, your tax forms and any questionnaire Social Security still has on its way to you. Late mail is how people find out about problems late.

Three things people get wrong about coming home

“I’ll file dual-status for the year I return.” Citizens don’t. The IRS says dual status refers only to resident status, not citizenship. You file an ordinary return, and the exclusion shrinks.

“Coming home lets me sign up for Part B right away.” It doesn’t, unless you were volunteering abroad or have another qualifying reason. For most returnees it’s January to March, with a gap in between.

“Years abroad wiped my record.” Neither record is wiped. Your Social Security credits are still there. Your credit file is still there, just stale.

None of this is hard on its own. It’s that each office explains its own clock and nobody puts them side by side. For the tax side in more depth, start with taxes when you retire abroad.