US vs International Stocks in 2026: The Home-Bias Bet I Refused to Make

In 2016 a friend from university looked over my shoulder at my portfolio, saw that about 40% of it was sitting outside America, and asked why I was "paying a tax to feel diversified." He wasn't being mean. He was being 2016. Back then the whole us vs international stocks question had one answer everybody agreed on, and the answer was: don't overthink it, buy America.

And honestly, the scoreboard backed him up. Hard.

The decade that made us vs international stocks feel like a settled argument

From 2010 through 2024, US stocks beat international by something like 503 percentage points cumulatively. International won in only three of those fifteen years. The S&P 500 compounded at roughly 11.9% a year while the developed world outside America crawled along at 3.6%. If you'd put a dollar in each at the start and looked back at the end of 2024, the American dollar had lapped the other one so many times it felt embarrassing to admit you owned the loser.

Data: Hartford Funds, Summit View, TLC Advisory, Morningstar.

So an entire generation of investors learned a lesson. The lesson was "ex-US is a drag." It became gospel on every forum. VTSAX and chill. Why own Europe and Japan when they just sit there gumming up your returns? People said it with the confidence of someone reading last year's results into next year's certainty, which is the oldest mistake in this whole game.

Here's the quiet thing nobody mentioned while they were winning: a big chunk of that American outperformance wasn't companies earning more. Roughly a third of it came from valuations expanding, investors simply agreeing to pay more for each dollar of US earnings. And the dollar itself rose about 39% over those years, which flatters US returns when you measure everything in dollars. Strip out the currency move and the re-rating, and the "obvious" win gets a lot less obvious.

But nobody wants to hear that during a bull run. I half-didn't either.

What actually flipped in 2025 (and didn't flip back)

Then 2025 happened.

International developed markets returned about 31% for the year. The S&P 500 did about 18%. That's a thirteen-point gap, in the wrong direction for team America, and the first time in five years the rest of the world won.

Data: Slickcharts and FinanceCharts (MSCI EAFE); Morningstar.

It wasn't a fluke month, either. Europe returned north of 35%. Japan did around 25%. And the lead carried into 2026: through January the international index was up about 6% against roughly 1.5% for the US, and it was still ahead by the middle of this year even measured in dollars.

What drove it? A few things at once. The dollar weakened, and a weaker dollar alone added something like ten percentage points to international returns for a dollar-based investor. That's the single biggest piece, and yes, it can reverse. US tariff policy rattled American multinationals. Central banks abroad were cutting rates aggressively. And the AI capital-spending wave stopped being a purely American story, spilling into hardware, power, and materials companies that happen to be listed in Seoul and Frankfurt and Tokyo.

Now here's what's happening in July 2026, and it's the whole reason I'm writing this. Every second headline says "add international now." The same people who spent a decade calling ex-US a drag are suddenly explaining why you need it.

Read that carefully, because it's the trap. Buying international because it just won is the exact same mistake as going all-in on America after 2010 to 2024. Same error, reversed. If your only reason to want a thing is that its recent chart looks good, you haven't learned anything from the last fifteen years. You've just changed which line you're chasing.

"Just buy America" was always a bet. Nobody called it one.

This is the part I wish someone had put plainly years ago.

A 100% US portfolio is not the neutral, default, safe choice. It feels neutral because it's what everyone around you did and it worked. But America is only about 60 to 64% of the world's stock market by value. So choosing to hold 100% US isn't opting out of a decision. It's making a very large active bet, roughly a 36-to-40 percentage-point overweight to one country, and quietly not calling it a bet.

And it's not just a bet on a country. It's increasingly a bet on about ten companies. The top of the index has become so concentrated in a handful of mega-cap tech names that "buy the index" now means "buy a tech-heavy basket that lives or dies with a few giants." I opened that hood in why your index fund quietly became a tech bet. It's a fine bet if you want to make it on purpose. It's a terrifying accident if you backed into it thinking you were being cautious.

There's also the valuation gap, which is doing a lot of talking right now.

Data: Siblis Research; GuruFocus.

By mid-2026 the S&P 500's cyclically adjusted P/E crossed 40, only the second time since 1871 it's been that high, the other being the dot-com peak. Meanwhile Germany, the UK, Spain, and most of the rest of the developed world trade at half that or less. Expensive doesn't mean it crashes tomorrow. Cheap doesn't mean it rallies tomorrow. But you're paying a genuinely historic price for American earnings, and the price you pay going in has always mattered for what you get coming out.

And even the two most popular "diversified" American funds don't fix this. Both VOO and VTI are 100% US, as I get into in VOO versus VTI. One holds 500 companies, the other holds the whole American market, and both leave the other third-and-change of the planet's companies on the floor. "Total market" means total American market. Easy thing to miss.

The boring cheat code: own the whole world and you never make the call

Here's the position I'll plant my flag on, and it's going to sound anticlimactic after all those numbers.

Most of the advice written about this is either overcomplicated or quietly selling you something. The fund companies telling you to add international now have international funds to sell. The ones telling you to stay American have a US story to tell. Almost nobody says the honest, boring thing, because there's no product attached to it: you do not have to answer the us vs international stocks question at all.

A single global market-cap fund answers it for you, automatically, forever.

When America is 63% of the world, the fund holds 63% America. If the US grows to 70% of global value, the fund drifts to 70% without you lifting a finger. If it shrinks to 50%, so does your weight. You are never overweight and never underweight, because your definition of "correct" is just "whatever the world actually is right now." No forecast. No rebalancing between regions. No 2 a.m. doubt about whether you called the top.

I wrote a whole piece on which of these funds actually make sense in best world ETFs if you want the specifics, but the mechanism is the point here. One fund, about 3,700 companies, roughly 49 countries, reweighting itself every day. The debate that fund companies and finance TV have been running for two years straight simply doesn't apply to you. You already own both sides of it, in exactly the proportion they exist.

It's not exciting. It never trends. It just quietly removes an entire category of decision from your life.

Two very smart forecasts that completely contradict each other

If you still think there's an obvious right answer here, look at what the professionals are saying, because they can't agree either.

Data: Vanguard 2026 outlook, Robert Shiller, Fidelity.

Vanguard's 2026 outlook expects US stocks to return something like 3.9 to 5.9% a year over the next decade, and international to do better, around 4.9 to 6.9%. Robert Shiller's own valuation model, using that CAPE above 40, implies US returns closer to 1.5% nominal a year from here. Both of those say the same thing: America is priced for greatness and might not deliver it.

Then you've got Fidelity's Denise Chisholm arguing more or less the opposite. Her data shows that when international is in its cheapest quartile relative to the US, which is exactly where it is now, it has historically had lower odds of beating America, not higher. Cheap stayed cheap. She thinks US earnings dominance continues, margins are at record highs, and "buy it because it's cheap" is a value trap that's burned people for years.

These are not cranks. These are some of the most credentialed shops on earth, looking at the same data, reaching flatly opposite conclusions.

That disagreement isn't a problem to solve. It's the answer. When people this smart, with this much data, land on opposite sides, the honest takeaway isn't "let me figure out which genius is right." It's "nobody knows, so stop betting the farm on either one." Owning the whole world is what you do when you take that uncertainty seriously instead of pretending you can out-forecast Vanguard and Fidelity at the same time.

What I actually do, and the tilt I almost made in 2018

I'm European. So my version of home bias isn't "too much America," it's the temptation to load up on Europe, the market I can see out my window. Research says European investors overweight their home region by around three times its actual global weight. Left to instinct, I'd have done the same, bought a pile of familiar names, and called it prudent.

I didn't. Since I started, the core of my portfolio has been one global all-world fund. Through the entire American bull run, through the mockery about the ex-US drag, through my friend's "diversification tax" line. About 40% of my money sat outside the US doing comparatively little for years while the S&P holders posted double digits, and I felt every point of that gap.

Now the confession, because being wrong is kind of my brand around here. Around 2018 I nearly caved. US exceptionalism looked permanent, and I remember sitting with a spreadsheet one evening, genuinely modeling what my returns "would have been" if I'd gone US-only from the start. The number was big enough to make me feel like an idiot for owning the world. I got as far as deciding which US fund I'd switch into. I was one or two clicks from performance-chasing at what turned out to be near the peak of the whole "it's so obvious" phase.

What stopped me wasn't brilliance. It was a rule I'd written down years earlier when I was calmer: I don't make regional bets, because the entire reason I bought the whole world was so I'd never have to. Following the rule I set in a calm moment beat the decision I wanted to make in an excited one. That's basically the whole skill.

2025 didn't vindicate a forecast I made. I never made one. It vindicated not making one, which is a far more repeatable thing to be right about, because it doesn't require me to be smart, only consistent. The reason time in the market beats calling the next region is the same reason it beats calling the next crash, which I got into in do stocks always go up. The horizon does the heavy lifting. My job is to not interrupt it.

How to check your real us vs international stocks split in ten minutes

Enough theory. Here's the actual homework, and it's quick.

First, add up where your money really is. Most people have no idea what their true US-versus-rest split is, because it's buried inside funds with vague names. A "total market" fund, a target-date fund, your employer plan's default: open them up and find the geographic breakdown. Plenty of "diversified" portfolios turn out to be 90 to 100% American once you actually look. I built the portfolio analysis tool partly for this exact job. Disclosure, it's my product and I run it, but a fund's own fact sheet or a spreadsheet does the same thing. The tool just makes the number faster to see.

Second, decide if that number is on purpose. Around 60 to 64% US is the market-cap-neutral answer. If you're at 100%, fine, but now you know it's an active 36-to-40-point bet on one country, and you get to decide whether you actually believe that or just drifted into it.

Third, pick a lane and write it down. Global market weight, a Vanguard-style 40% international tilt, or a deliberate US overweight are all defensible if you chose them. What's not defensible is letting last year's chart pick for you every January.

Fourth, if you decide to change your mix, do it with new contributions instead of panic-selling what you've got. Point fresh money at the underweight side and let it drift toward your target over a year or two. No tax bill, no dramatic market-timing call, no all-or-nothing moment.

And whatever you land on, write down the reason. Not the allocation, the reason. When international has another great year, or a terrible one, the note you wrote in a calm moment is the only thing that'll keep you from doing the dumb, obvious, expensive thing at exactly the wrong time.

Because here's where I've landed after a decade of this. The us vs international stocks debate isn't really a question about economics. It's a question about whether you can sit still while the internet screams at you to chase whichever line is winning this year. I nearly failed that test in 2018. The whole point of owning the world is that I never have to take it again. Neither do you.