The Expat Sage Podcast

How Totalization Agreements Stop Double Social Security Taxes Abroad

The Expat Sage

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Your passport can cost you money. If you take a job overseas or you build a remote-work life abroad, the default rules can push you into a brutal outcome: Social Security taxes to two countries on the same income. We walk through why that happens, how big the hit can be (especially for self-employed expats facing the 15.3% US self-employment tax), and how to spot the danger before it shows up as missing cash in your bank account. 

We break down the core fix: US totalization agreements. These international treaties are built to prevent double Social Security taxation and to protect your retirement benefits when your career spans borders. We explain the detached worker rule for employees, why the timeline matters, and why some countries have surprising exceptions. Then we shift to the modern reality of freelancing and digital nomad work, where the treaties often use a residency rule instead, and where non-treaty countries like the UAE or Singapore can leave you with no shield at all. 

Next, we get practical. The difference between “protected” and “audited” often comes down to paperwork, specifically the certificate of coverage that proves to the host country you are exempt. Finally, we look at the long game: combining work credits across countries to qualify for benefits, receiving proportional payments from multiple systems, and what changed when the Social Security Fairness Act repealed the Windfall Elimination Provision. One last catch could shape your whole plan if you want to retire back in the United States: Medicare is not totalized, so your 40 quarters for Medicare Part A still require US work history. 

Subscribe for more clear guides to expat taxes, international Social Security, and retirement planning abroad, and if you know someone working overseas, can you share this with them and tell us where they are based?

You can find more information in the article European Countries with U.S. Totalization Agreements, and ask questions about the U.S. International Social Security Totalization Agreements.

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Moving, Working, and Investing for Americans Abroad

Hidden Double Tax Trap

SPEAKER_02

If you've ever, you know, dreamed of taking a job overseas, or maybe you're already a digital nomad working from a laptop in Lisbon or somewhere, there is this hidden tax trap just waiting for you. And it could literally drain thousands of dollars from your income.

SPEAKER_00

Oh, absolutely. It's a massive blind spot for so many expats.

SPEAKER_02

Right. But at the same time, there's a relatively obscure international treaty system that is specifically designed to save you from that exact trap. So today we are giving you a simple, powerful guide to keeping your money and, you know, securing your future retirement.

SPEAKER_00

Yeah, which is no small feat.

SPEAKER_02

Not at all. We're going to decode the complex and honestly just overwhelming world of international Social Security taxes for foreign workers.

SPEAKER_00

Aaron Powell It is a notoriously tangled web. I mean, truly. We're looking at financial regulations here that cross sovereign borders, spend decades of a worker's life, and involve the most formidable tax agencies on the planet.

SPEAKER_02

Aaron Powell Yeah, but to navigate this, we aren't just guessing. We are pulling directly from a massive stack of official documentation for this deep dive. Trevor Burrus, Jr.

SPEAKER_00

Right, getting right to the source material.

SPEAKER_02

Trevor Burrus Exactly. We've gone through the internal IRS and Social Security Administration codes. We've analyzed legal briefings from the nonprofit advisors at WagonMaker and Oberly, and studied the expat tax guides published by Greenback Tax Services.

SPEAKER_00

And bringing all of that together paints a surprisingly clear picture of what you actually need to do.

SPEAKER_02

Aaron Powell It really does. So let's just start with the baseline threat here. A worker steps off a plane to start a new job in a new country. What is the immediate financial hazard they're

Territoriality And Citizenship Clash

SPEAKER_02

walking into?

SPEAKER_00

Aaron Ross Powell Well, the baseline problem revolves around a concept called the territoriality rule.

SPEAKER_02

Aaron Powell The Territoriality Rule. Yeah.

SPEAKER_00

So in the realm of international tax law, the fundamental premise is that the country where you are physically standing and performing the labor has the inherent right to tax you. Aaron Powell Right.

SPEAKER_02

Which makes sense. Trevor Burrus, Jr.

SPEAKER_00

It does. I mean, if you're an American working in an office in Paris, France expects you to pay into their social security system. That's intuitive to most people. The complication arises because the United States is, well, one of the only countries on earth that taxes its citizens based on citizenship, regardless of geography.

SPEAKER_02

Aaron Powell Wait, so the U.S. government doesn't care if I haven't lived in the States for a decade. My passport alone means I'm on the hook.

SPEAKER_00

Trevor Burrus, Jr. Precisely. That's the trap. Without any special legal interventions, a U.S. citizen working abroad, or conversely, you know, a foreign national working in the U.S. is automatically legally obligated to pay Social Security taxes to both countries. Trevor Burrus, Jr.

SPEAKER_02

On the exact same earnings.

SPEAKER_00

On the exact same earnings, yeah. It is the absolute definition of dual taxation. Trevor Burrus, Jr.

SPEAKER_02

That is just staggering when you think about it. I mean, it's like buying a single movie ticket, but the theater owner and the movie studio both independently charge you full price at the door.

SPEAKER_00

That's a great way to put it.

SPEAKER_02

You are paying double for the exact same end goal, which is a retirement fund. And the percentages we're talking about here, they aren't small, right?

SPEAKER_00

Oh, they're very significant. So for a standard W-2 employee, you're looking at the FICA tax, which is 7.65% of your income.

SPEAKER_02

Okay.

SPEAKER_00

So that's that's 6.2% going to Social Security and 1.45% to Medicare. And your employer is also matching that.

SPEAKER_01

Wow.

SPEAKER_00

So if you're working in France, roughly 15% of your total compensation is just vanishing into the US system, while the French government is simultaneously deducting their own social insurance taxes from your paycheck.

SPEAKER_02

Which are often much higher, right?

SPEAKER_00

Often much higher.

SPEAKER_02

And if you're self-employed, the math gets even darker, doesn't it?

SPEAKER_00

Oh, it's brutal.

SPEAKER_02

Because you act as both the employer and the employee. So you pay the SEA tax, which is a massive 15.3% on your net earnings.

SPEAKER_00

Exactly. Imagining a freelancer having to forfeit 15.3% to the IRS and then turning around and paying a host country's tax authority on top of that.

SPEAKER_02

I mean, that kind of margin would crush a small business before it even launched.

SPEAKER_00

It absolutely would. Which brings us to the obvious question, right? How is global commerce even possible under those conditions? Aaron Powell Yeah.

SPEAKER_02

If the system defaults to double taxation from day one, multinational corporations couldn't afford to send executives overseas.

SPEAKER_00

Aaron Powell Right, because the cost of making those employees whole would just be astronomical.

SPEAKER_02

Aaron Powell So there has to be a mechanism that overrides that default

Totalization Agreements Explained

SPEAKER_02

setting.

SPEAKER_00

Aaron Powell There is, thankfully. The rescue mission here comes in the form of what are called totalization agreements.

SPEAKER_02

Aaron Powell Totalization Agreements. Okay, what are those exactly?

SPEAKER_00

Aaron Powell They're bilateral treaties that the U.S. government negotiates one-on-one with other countries. Their explicit purpose is to eliminate this double taxation and ensure workers don't lose their benefits.

SPEAKER_02

Aaron Powell Okay, so how many of these are there?

SPEAKER_00

Currently, the U.S. holds active agreements with about 30 countries. This covers most of Europe, Australia, Japan, and several South American nations.

SPEAKER_02

Aaron Powell Knowing that these are negotiated treaties, I imagine they don't just, you know, flip a coin to decide which country gets to tax you. How do they actually draw the line?

SPEAKER_00

Aaron Powell Good question. So for traditional employees, these agreements rely heavily on what is called the detached worker rule.

SPEAKER_02

The detached worker rule.

SPEAKER_00

Yeah. And this rule draws a very specific line in the sand at the five-year mark.

SPEAKER_02

Five years.

SPEAKER_00

Right. The underlying logic here is intent. The governments need to determine if you are just temporarily working abroad or if you're actually putting down roots and integrating into the foreign country's economy long term.

SPEAKER_02

Aaron Powell So a five-year timeline is basically the ultimate litmus test for whether you're a temporary visitor or a permanent resident in the eyes of the tax agencies.

SPEAKER_00

Aaron Powell That's the standard framework, yes. If your US employer sends you to a treaty country for a temporary assignment expected to last five years or less, you are classified as a detached worker.

SPEAKER_03

Meaning.

SPEAKER_00

Meaning you remain entirely on the U.S.

Detached Worker Rule And Exceptions

SPEAKER_00

Social Security system, you and your employer continue paying the IRS, and you are granted full immunity from paying into the host country's system.

SPEAKER_02

Oh wow. Okay, that prevents a massive administrative nightmare for a company that's just trying to send, say, an engineer to Germany for a two-year project.

SPEAKER_00

Exactly. It keeps things simple.

SPEAKER_02

But if that project gets extended and they hit year six, the intent has clearly changed, right?

SPEAKER_00

The intent changes and the tax liability flips. Yeah. If you are transferred for more than five years from the outset, or and this is key, if a foreign employer hires you directly with no U.S. company involved, you are not considered detached.

SPEAKER_02

Trevor Burrus, Jr. You just switch entirely to the host country system.

SPEAKER_00

Exactly. You switch to their system and you become exempt from U.S. Social Security taxes.

SPEAKER_02

Aaron Ross Powell Okay, but because these are bilateral treaties negotiated country by country rather than some sweeping global law, there must be anomalies, right? Like what happens when the US sits down with different nations who have radically different social safety nets?

SPEAKER_00

Aaron Powell Oh, there are definite anomalies. The Wagon Maker and Oberly briefings highlight some fascinating exceptions that prove your exact point.

SPEAKER_01

Oh, really? Like what?

SPEAKER_00

Well, every tree reflects the priorities of the specific nations involved. Take Italy, for example.

SPEAKER_01

Right.

SPEAKER_00

The U.S.-Italy agreement contains no five-year constraint at all for detached workers.

SPEAKER_02

Wait, none. That is a massive loophole.

SPEAKER_00

It is.

SPEAKER_02

So an American could be sent to Rome by their U.S. employer for 15 years, buy a house, raise kids, and theoretically remain on the U.S. tax system the entire time.

SPEAKER_00

Under the strict terms of that specific treaty, yes.

SPEAKER_02

Wow. Why would Italy agree to that?

SPEAKER_00

Well, Italy's domestic pension system has historically been incredibly complex and burdened. Negotiating a strict cutoff was likely less beneficial for them than simply allowing long-term U.S. expats to remain off their books entirely.

SPEAKER_02

That's wild.

SPEAKER_00

But then on the complete opposite end of the spectrum, you have Denmark.

SPEAKER_02

What's Denmark's deal?

SPEAKER_00

For employees transferred from Denmark to the United States, the limit isn't five years. It's a strict three-year maximum to retain Danish social security coverage.

SPEAKER_02

Only three years. I guess that aggressive timeline makes sense when you look at the Danish model, right?

SPEAKER_00

How so?

SPEAKER_02

Well, Denmark funds its robust social safety net heavily through general taxation, and they tightly regulate integration into their welfare state. They want you contributing to the local system quickly, or they want you out of theirs.

SPEAKER_00

That is exactly the macroeconomic logic driving that three-year clause.

SPEAKER_02

Okay, so the detached worker rule is a brilliant shield if you have a massive corporate HR department moving you around and managing your temporary status.

SPEAKER_00

Right. But what if you don't have an employer to detach you? I mean, the modern workforce is full of independent contractors. If I'm a solo web developer moving to Lisbon, who is protecting me?

SPEAKER_02

Ah, that is a critical vulnerability. For self-employed individuals,

Self-Employed Residency Rule Risks

SPEAKER_02

the detached worker rule completely evaporates. Because there's no employer. Exactly. There's no employer to detach you. So instead, the treaties pivot to the residency rule.

SPEAKER_00

Residency rule. Got it.

SPEAKER_02

This dictates that self-employed workers, whether you're a freelance coder, an independent consultant, or even a minister sent abroad to plant a church, are subject to the social security system of the country where they legally reside.

SPEAKER_00

Aaron Powell Okay, so if I move to Portugal, which is one of the 30 treaty nations, and I establish legal residency there, I fall entirely under the Portuguese system.

SPEAKER_02

Aaron Powell You do. Because you reside there, your contributions go to Portugal. And the ultimate benefit here is that by utilizing this treaty, you legally bypass that brutal 15.3% U.S. self-employment tax.

SPEAKER_00

Which is an incredible financial relief for an entrepreneur.

SPEAKER_02

Huge relief. But wait, this entire safety net requires the host country to be on that list of 30 treaties.

SPEAKER_00

Oh, right.

SPEAKER_02

If you're listening to this right now while packing your bags for a country not on that list, you might want to sit down for this next part.

SPEAKER_00

Yeah, brace yourself.

SPEAKER_02

What happens if our freelancer sets up their laptop in a massive economic hub that the U.S. doesn't have an agreement with?

SPEAKER_00

The gaps in the treaty map are severe. Destinations like Singapore, Hong Kong, the United Arab Emirates, and Mexico do not have totalization agreements with the United States.

SPEAKER_02

Aaron Powell Wait, why not? The UAE and Singapore are huge destinations for global talent. It seems like a massive oversight not to have treaties with them.

SPEAKER_00

It's not an oversight so much as a structural incompatibility.

SPEAKER_02

What do you mean?

SPEAKER_00

Well, a totalization agreement requires a baseline level of reciprocity. The US operates on a pay-as-you-go payroll tax system to fund its pensions. Right. A place like the UAE, on the other hand, doesn't levy traditional income or payroll taxes on expats to fund a universal pension in the same way. Their social safety net is structured entirely differently.

SPEAKER_02

Oh, I see.

SPEAKER_00

Yeah. So because there's no equivalent system to align with, a one-to-one reciprocity treaty is functionally impossible. Trevor Burrus, Jr.

SPEAKER_02

Meaning the double tax trap in those countries is inescapable.

SPEAKER_00

Unavoidable. If you are self-employed in a non-treaty country like the UAE or Mexico, you will owe the IRS your 15.3% self-employment tax on your worldwide net earnings.

SPEAKER_02

Aaron Powell On top of the local taxes.

SPEAKER_00

Yes. In addition to whatever social insurance or mandatory provident fund contributions the local host country demands, there is no legal shield available to you.

SPEAKER_02

Aaron Powell Man, that is a harsh reality check for the digital nomad community. Aaron Powell Truly. Okay, let's look at the operational

Certificate Of Coverage Paperwork

SPEAKER_02

side of this. Say I am living in Germany, I'm fully aware I'm in a treaty country, and I know I'm protected under the five-year detached worker rule.

SPEAKER_00

Okay, good scenario.

SPEAKER_02

Aaron Powell The German tax authority isn't just going to take my word for it when I tell them I don't owe the money, right? There must be some sort of cross-border paperwork, like a hall pass from the IRS, that proves my immunity.

SPEAKER_00

Aaron Powell The Hall Pass concept is spot on. You cannot simply stop paying and assume the governments will sort it out.

SPEAKER_02

Aaron Ross Powell That sounds like a bad idea.

SPEAKER_00

It's a fast track to a devastating audit and frozen assets. The expat tax guides from Greenback Tax Services are incredibly blunt about this. They say you need a tangible paperwork shield called a certificate of coverage.

SPEAKER_02

Aaron Powell A certificate of coverage. And how is that generated? Does the IRS just mail it out when I change my address?

SPEAKER_00

No, no. It requires proactive filing. You must request it from the country whose system you are actively paying into.

SPEAKER_02

Aaron Powell Okay, so in my Germany scenario, since I'm staying on the U.S. system.

SPEAKER_00

Aaron Ross Powell Your U.S. employer applies to the Social Security Administration for this certificate.

SPEAKER_02

Aaron Powell Got it. So it serves as the physical proof of exemption. When the German tax auditors look at my payroll and ask why I'm not contributing to their social fund, I just hand them the U.S. certificate of coverage.

SPEAKER_00

Trevor Burrus And it immediately shuts down the inquiry. It proves you were already contributing to a recognized treaty partner.

SPEAKER_02

Aaron Powell That's incredibly powerful.

SPEAKER_00

Trevor Burrus It is, but Greenback stresses that you must secure the certificate before you even board the plane to start the assignment.

SPEAKER_02

Aaron Powell Before you leave.

SPEAKER_00

Yes. If you wait until tax season to figure this out, you will likely have taxes aggressively withheld by both countries, and you'll spend months fighting bureaucratic red tape trying to get those funds refunded.

SPEAKER_02

Okay, so the totalization agreement is the abstract legal shield, but the certificate of coverage is the physical sword you use to enforce it.

SPEAKER_00

Exactly.

SPEAKER_02

All right, we've established how to protect your paycheck today. But

Building A Multicountry Pension

SPEAKER_02

let's look at the long game. What happens in 30 years when it's time to retire?

SPEAKER_00

The fun part.

SPEAKER_02

Right. If someone has a chaotic, globally fragmented career, say, three years working in Germany, eight years in the US, and ten years in the UK, are they just out of luck because they never stayed in one place long enough to fully vest in a pension?

SPEAKER_00

This brings us to the second, equally vital purpose of totalization agreements. Without them, that worker would be facing a retirement disaster. Why? Because the U.S. requires 40 quarters of coverage, which equates to 10 full years of work to qualify for any Social Security retirement benefits. Expats frequently fall short of that threshold in any single country.

SPEAKER_02

So an eight-year stint in the U.S. leaves that worker two years short of receiving a dime, despite paying into the system for nearly a decade.

SPEAKER_00

Yep. That is where the magic of the treaty kicks in, though. Totalization allows countries to combine your work credits to push you over that eligibility finish line.

SPEAKER_02

Combine them.

SPEAKER_00

Well, to qualify for partial U.S. benefits under an agreement, the hurdle drops drastically. You only need a minimum of six U.S. credits, which is about one and a half years of American work history.

SPEAKER_01

Oh, wow.

SPEAKER_00

Yeah, and if you have that, the US will look at your time in Germany and the UK and allow you to count those foreign years to get past the 10-year requirement.

SPEAKER_02

Aaron Powell Ah, I see. It's essentially like transferring college credits. You know, you take freshman classes at one university, transfer to another for your sophomore year, and finish up at a third. When you combine the transcripts, the final university sees that you did the requisite work and they grant you the degree.

SPEAKER_00

Aaron Powell The University analogy works well for understanding eligibility, yes. But the SSA documentation provides a very necessary distinction regarding the payout.

SPEAKER_02

Aaron Powell What's the distinction?

SPEAKER_00

Your credits don't physically transfer or leave their origin country. Trevor Burrus, Jr.

SPEAKER_02

They don't.

SPEAKER_00

No. The U.S. is not absorbing your UK credits into the Washington Treasury.

SPEAKER_01

Aaron Powell Okay. If the credits stay put, how does the actual payout work?

SPEAKER_00

Aaron Powell Combining credits just unlocks the door to eligibility in each nation. Your contributions remain on your record in the country where you earned them. Okay. When you retire, you will receive a partial proportional benefit payment separately from each country based solely on the actual time you spent paying into their specific system.

SPEAKER_02

Aaron Powell So upon retiring, this worker would get a small monthly deposit from the US representing those eight years, another separate deposit from the UK for those ten years, and a minor deposit from Germany.

SPEAKER_00

Exactly.

SPEAKER_02

They're essentially stitching together a Frankenstein pension from multiple sovereign nations.

SPEAKER_00

A Frankenstein pension is a great way to visualize it. You totalize your time to prove you worked enough years globally, but the checks you receive are strictly proportional to what you paid into each

WEP Repeal And Medicare Catch

SPEAKER_00

local system.

SPEAKER_02

Okay, but here's where I have to push back on the math of this, because I've heard horror stories from older expats.

SPEAKER_00

Oh, I bet you have.

SPEAKER_02

If a retiree is collecting a proportional pension from the UK and another proportional pension from the US, isn't that considered double dipping? For a long time, the U.S. would severely penalize people for doing exactly this.

SPEAKER_00

You are referencing the Windfall Elimination Provision known as the WEP.

SPEAKER_01

The WEP, yeah.

SPEAKER_00

And historically, you would be completely correct. For decades, the WEP acted as a punitive measure. It drastically slashed U.S. Social Security benefits, sometimes by hundreds of dollars a month, if an expat was also receiving a foreign pension.

SPEAKER_02

Which feels so unfair if they earned it.

SPEAKER_00

It was a massive point of contention. But the latest 2026 sources detail a profound shift in this landscape.

SPEAKER_01

What change?

SPEAKER_00

In January 2025, the Social Security Fairness Act was passed, which completely repealed the WEP alongside the government pension offset.

SPEAKER_02

Wait, completely repeal. How does the U.S. system afford to pay out 100% of a benefit to someone who is also drawing a full government pension from the UK? Doesn't that strain the trust fund?

SPEAKER_00

It was a massive legislative debate, but it ultimately came down to the philosophy of earned benefits. Okay. The argument that won out was that workers paid those FICA taxes out of their own paychecks for the required amount of time. Penalizing public servants and international workers by reducing a benefit they mathematically paid for was deemed fundamentally unfair.

SPEAKER_01

Yeah, that tracks.

SPEAKER_00

So the penalty was abolished. Expats now get to keep 100% of the benefits they earned in both systems.

SPEAKER_02

That is amazing.

SPEAKER_00

And furthermore, the repeal was made retroactive to 2024. Retirees who had been suffering under the WP actually received lunk sum back payments to make them whole.

SPEAKER_02

Wow. That is life-altering news for anyone who spent their career hopping between treaty countries. It fundamentally validates the financial viability of a global career path.

SPEAKER_00

It really does.

SPEAKER_02

However, before we declare total victory over the tax code, is there a final caveat we need to be aware of? What is the catch here?

SPEAKER_00

There's always a catch, right? Always. The catch involves health care, specifically regarding the US system. We have established that totalization agreements protect your retirement, disability, and survivor benefits.

SPEAKER_02

Right.

SPEAKER_00

But they explicitly do not cover Medicare.

SPEAKER_02

Aaron Ross Powell Wait, but FICA taxes include Medicare. We established earlier that the 7.65% includes 1.45%, specifically earmarked for Medicare. If I'm paying into it, why isn't it totalized?

SPEAKER_00

Aaron Ross Powell It is incredibly counterintuitive, I know. Yeah. The reasoning is that Medicare is an entirely different fund with different eligibility mechanics, deeply tied to U.S. residency and the domestic healthcare infrastructure. Okay. So you cannot use foreign work credits to reach the 10-year threshold required for free U.S. Medicare Part A hospital insurance when you turn 65. You must earn those 40 quarters entirely through domestic U.S. work history.

SPEAKER_02

The strategic implications of that are huge. You could perfectly orchestrate your international career, utilize every treaty, and retire back in the U.S. with a wonderfully healthy combined global pension. But because your foreign years don't count toward Medicare, you could find yourself entirely on the hook for massive hospital insurance premiums in your senior years.

SPEAKER_00

Which is exactly why relying solely on treaties isn't enough. If your ultimate goal is to return to the U.S. for retirement, you have to ensure you physically log 10 years of domestic work to secure that healthcare coverage.

SPEAKER_02

This entire deep dive has been a masterclass in global financial survival. To summarize the toolkit we've built, if you're working across borders, totalization agreements are your baseline shield against the crushing weight of dual taxation.

SPEAKER_00

Right.

SPEAKER_02

But you have to verify that your destination is actually on the treaty list rather than a danger zone like the UAE or Singapore.

SPEAKER_00

And you must actively deploy that shield by demanding a certificate of coverage from your home tax authority before you begin the work.

SPEAKER_02

Then at the end of your career, those same treaties allow you to combine your fragmented work history, unlocking eligibility across borders, and allowing you to collect a penalty-free multinational pension thanks to the 2025 WEP repeal.

SPEAKER_00

Exactly. Just remember that Medicare requires a strictly American timeline.

SPEAKER_02

Right. Seeing how intricately we have to stitch together a retirement from the laws of different

Big Question For Borderless Retirement

SPEAKER_02

sovereign nations really highlights a larger shift.

SPEAKER_00

It definitely does.

SPEAKER_02

It requires navigating overlapping treaties, acquiring certificates, and calculating proportional payouts.

SPEAKER_00

Yeah.

SPEAKER_02

But as remote work continues to make national borders invisible to the daily reality of the worker, it begs a massive question.

SPEAKER_00

What's that?

SPEAKER_02

How long will it be before the global financial system is forced to entirely reimagine the concept of a national retirement fund?

SPEAKER_00

Well, our current taxation framework is entirely anchored to physical geography and citizenship, yet the modern economy is increasingly independent of both. Right. The friction between those two realities is only going to grow.

SPEAKER_03

If we are effectively living and working as global citizens today, what does a truly global borderless retirement mechanism look like tomorrow? That is something to ponder the next time you log on from a cafe in a new time zone. Thank you for joining us for this deep dive into the world of international tax and retirement. Keep asking the hard questions and keep learning.