International diversification

In short

A friend of mine once told me he owned a hundred stocks and felt perfectly safe. Then I asked where the companies were based, and every last one sat in his own country. International diversification means owning a share of businesses in many countries, not just your home one. You can do it with one fund that holds stocks from around the world, or with a mix of a home fund and a foreign fund. Look at what you hold today and find out what share sits outside your home country. Check the yearly fee on every fund, because a small fee gap adds up over the years. Know that foreign investing brings its own costs, including currency swings and, sometimes, foreign taxes.

The whole of it

What it is

I once watched a farmer plant corn in one field and wheat in another. When I asked why, he laughed and said the weather had never once asked his permission. International diversification works on the same idea. You spread your money across companies in many countries, so no single country's bad year can sink the whole boat.

You have probably heard the phrase "don't put all your eggs in one basket." This is that advice, stretched across a map. A country's stock market can rise for a decade and then sit still for the next one. Different countries rise and fall at different times, and that gives you a reason to look past your own border.

Home bias is the habit of keeping most of your money in your own country. It feels natural. You know the brand names, you speak the language, you read the news. Nothing about that habit is foolish. But it does mean your fortunes are tied to one economy, and a wise person likes to know what she is tied to.

Most everyday investors reach other countries through funds. A fund pools money from many people and buys many companies at once. Some funds hold only foreign companies from rich nations. Others hold companies in emerging markets, which are countries with younger, faster changing economies. Some hold the whole world in one package.

How it works

If you are holding a retirement account, you have likely seen a list of funds with names like international, global, or world. The words matter. A global fund usually includes your home country along with the rest. An international fund usually leaves your home country out. Read the fund's own description to be sure, because names can fool you.

Here is the plain mechanics. Suppose you own a fund that holds companies in Japan. Those companies earn yen and pay their bills in yen. When the fund reports your gain in dollars, it converts from yen. If the yen gets stronger against the dollar, your fund gets a lift. If the yen gets weaker, your fund takes a hit. This is called currency risk. It can help you or hurt you, and it is part of the price of admission.

Some funds try to cancel out that currency effect. They are called hedged funds, and hedging costs money, which shows up in the fund's fee. Other funds leave the currency effect alone. Neither choice is right for everybody. Each is a different trade, and the fund's documents will tell you which one you have.

Then there are taxes. Some countries take a slice of the dividends a company pays before the money ever reaches you. In a regular taxable account, the United States lets you claim a credit for many of these foreign taxes, using IRS Form 1116. In a retirement account, that credit usually cannot be claimed. Not a big deal for most people, but worth knowing.

The numbers, and where to find yours

Let me tell you where to look, because a number you found yourself will always beat one somebody handed you. Start with your fund's expense ratio. That is the yearly fee, shown as a percent of your money. You will find it on the fund's own fact sheet or in its prospectus, which is the legal document every fund must publish. The SEC's free tool at Investor.gov also has a fund analyzer that lets you compare fees side by side.

Next, find your fund's country mix. Fund companies publish this on the fund's web page, often as a map or a table. Add up the share that sits in your home country and the share that sits abroad. Do this for every fund in your account, then combine them.

If your money is in a retirement plan at work, your plan sends a fee disclosure each year. Look for it. It lists the cost of each fund in the menu.

Now the numbers set by law. The foreign tax credit has a cap on how much you can claim without filing the full form, and that figure is the current figure, which the official source publishes each year. Contribution limits to your retirement accounts change too, and this year's limit for a 401(k) is the current figure, which the official source publishes each year. For an IRA, it is $7,500 for 2026 (source, checked 10/4/2026). The site fills in the current figure and its source, so I will not guess at them here.

A worked example

I want to tell you about a woman named Marta. She is fifty one, and she has 200,000 dollars in her retirement account. She figured she was well spread out, since she held two funds.

Fund A holds 120,000 dollars and is a total United States stock fund. Fund B holds 80,000 dollars and is an S and P 500 index fund. Marta read both fund pages and found that neither one held a single company outside her country. So her foreign share was 0 dollars out of 200,000, which is 0 percent.

She decided she wanted about 30 percent of her stock money abroad. That is her own choice, and there is no magic number. To see what that would mean, she did the math. Thirty percent of 200,000 dollars is 200,000 times 0.30, which equals 60,000 dollars.

Next she looked at fees. A total world fund charged 0.10 percent a year. A fund with a stronger foreign tilt charged 0.45 percent. On 60,000 dollars, the first costs 60,000 times 0.0010, which is 60 dollars a year. The second costs 60,000 times 0.0045, which is 270 dollars a year. The gap is 270 minus 60, which is 210 dollars every year.

That number stopped her cold. Two hundred ten dollars each year does not sound like much. But it comes out of her balance every year, and it never comes back. She did not decide anything that afternoon except to read the fee pages more carefully. That was a good afternoon's work.

Where it goes wrong

Now, I have made my share of mistakes, so let me tell you the common ones. The first is chasing whatever did best last year. A country that soared last year gets crowded with new buyers, and a good past does not promise a good future. If you find yourself excited about a hot market, take a breath.

The second is paying too much. Foreign funds, and emerging market funds most of all, tend to charge more than plain home funds. Check the expense ratio, and compare it to similar funds. A high fee is a sure cost, while a bright outlook is only a hope.

The third is doubling up without knowing it. Many people own a global fund and also an international fund, and end up with far more abroad than they meant to. Read what each fund holds. Count it once, not twice.

The fourth is forgetting about currency. When your foreign fund drops, the cause might be the companies, or it might be the exchange rate. Those are two separate things, and it helps to know which one you are looking at.

The fifth is expecting diversification to protect you in every storm. In a real panic, markets around the globe often fall together. Spreading your money out is no shield against all loss. It is a way to avoid tying everything to one place.

Questions to answer before you leave this page

What share of my stock money sits outside my home country right now, and did I check the fund pages to find out, or did I guess? Why do I hold the mix I hold, and would I be comfortable explaining it to a friend across the porch rail? What does each fund charge me each year, and what does that come to in dollars, not just in percent? Do I understand whether my foreign funds hedge the currency or leave it alone? Am I holding these funds in a taxable account or a retirement account, and what does that mean for foreign taxes? Have I checked this year's limits on the official pages before I add any money? And when did I last look, and when will I look again?