The FTSE 100 Yields 3.5% at 11x Earnings — The S&P 500 Yields 1.3% at 21x. You're Buying the Top

The S&P 500 trades at roughly 21 times trailing earnings. The FTSE 100 trades at roughly 11 times. That's not two markets in the same ballpark — that's two markets pricing in completely different futures. The US is priced for perfection. The UK is priced for disappointment.

History is clear on what happens when you buy at 21x earnings. US stocks have traded above 20x cyclically-adjusted earnings only three times in 140 years: 1929, 1999, and today. The first two ended badly. Maybe this time is different. Probably not.

UK stocks at 11x earnings, by contrast, are pricing in stagnation. The ONS data shows the UK economy grew 0.6% in Q1 2026 — not stellar, but not recession. UK corporate earnings are not collapsing. They're growing slowly but steadily. The valuation discount reflects sentiment, not fundamentals. And sentiment reverts.

When it does, the re-rating from 11x to even 14x — still a discount to global averages — generates a 27% capital return before you count a single penny of earnings growth. That's the asymmetry embedded in UK equity prices right now. Our free cash flow guide explains how to verify that earnings quality supports the valuation case.

The standard critique of UK equities — that they're all banks, oil, and miners — misses a more important fact: roughly 70% of FTSE 100 revenues come from outside the UK. Shell, BP, HSBC, Diageo, Unilever, AstraZeneca, Rio Tinto — these are global businesses that happen to list in London.

When you buy a FTSE 100 tracker, you are not buying "the UK economy." You are buying a collection of multinationals whose fortunes are tied to global GDP, commodity prices, and emerging-market demand. The correlation between UK GDP growth and FTSE 100 earnings is surprisingly weak precisely because the index is so international.

This is the best kind of home bias — one that doesn't actually expose you to the domestic economy. You get the governance protections of UK listing rules, the dividend culture of British corporate stewardship, and sterling-denominated returns — but your earnings stream is global. An investor who replaces a FTSE 100 tracker with a global tracker is, to a significant degree, swapping one set of multinationals for another — just paying twice the multiple for the privilege.

The FTSE 100 currently yields roughly 3.5%. For comparison, the UK 10-year gilt yield sits at 4.82% — which means equities yield less than risk-free government bonds. That's unusual and suggests either gilts are expensive or equities are cheap. Given that the Bank of England held rates at 3.75% in December and markets expect cuts ahead, it's likely both. See our dividend yield explainer for a fuller breakdown of what drives FTSE 100 income.

The yield inversion — where equities yield less than risk-free government bonds — is a rare signal. The last time it persisted this long in the UK was during the 2008–09 financial crisis. Then, as now, it marked an attractive entry point for equity investors with a multi-year horizon.

Going global sounds prudent until sterling has one of its periodic crises. The pound fell from $1.42 to $1.07 in 2016. It dropped from $1.35 to $1.07 again in September 2022 during the mini-budget. In 2026, sterling sits at roughly $1.34 — but the ONS balance of payments data shows the UK still runs a persistent current account deficit, and as headlines today confirm, geopolitical tensions in the Middle East present tail risks that could send it lower.

When sterling weakens, unhedged global equity holdings rise in value — and that's supposed to be the argument for them. But here's what the globalistas miss: when sterling weakens sharply, it's usually because something terrible is happening in the UK. Your house price falls. Your job is at risk. Your sterling salary buys less. The last thing you need in that scenario is a portfolio that's entirely detached from the currency you actually spend.

UK equities provide a partial hedge in both directions. If the UK does well, sterling strengthens, and your UK stocks benefit from a stronger domestic economy. If the UK struggles, sterling weakens, and the FTSE 100's 70% foreign revenue stream gets a mechanical boost in sterling terms — exactly as it did after the Brexit vote, when the FTSE 100 rallied in sterling while the domestic economy wobbled.

A global tracker gives you none of that duality. It rises when sterling falls and falls when sterling rises. For a UK investor spending pounds, that's uncompensated volatility that UK equities largely eliminate.

The MSCI World Index is 64% United States. The top 10 holdings — Apple, Microsoft, Nvidia, Amazon, Meta, Alphabet (twice), Tesla, Broadcom, Berkshire Hathaway — are all US-listed technology companies. When you buy a "global" tracker, you are not diversifying across countries. You are making a 64% bet on one country and a roughly 25% bet on seven technology stocks.

This concentration has been spectacularly profitable for 15 years. But concentration risk cuts both ways. The AI-fuelled rally that drove these stocks to current valuations is now facing questions: monetisation timelines, regulatory scrutiny, and the genuine possibility that the technology will commoditise faster than the incumbents can build moats around it.

A meaningful UK allocation — say 20–30% — is a genuine diversifier from this concentration. The FTSE 100's sector weights (financials, energy, consumer staples, healthcare) have almost zero overlap with the S&P 500's (technology, communication services, consumer discretionary). When tech sells off, UK equities typically hold up better. In the 2022 bear market, the S&P 500 fell 19% while the FTSE 100 rose 0.9% in sterling terms — a 20-percentage-point divergence driven entirely by sector composition.

That's what diversification actually looks like: holding assets that behave differently when it matters. A global tracker at market-cap weight, paradoxically, is less diversified by sector and factor exposure than a portfolio that includes a deliberate UK overweight. Our 60/40 portfolio analysis demonstrates why traditional diversification failed precisely when it was needed most.

For a practical framework, browse our investing hub and our guide to index funds — both walk through how to construct a genuinely diversified portfolio from a UK ISA rather than outsourcing the decision to a market-cap-weighted index.

UK dividends benefit from a £500 tax-free annual allowance. More importantly, inside an ISA or SIPP, UK dividends arrive gross and stay gross. Foreign dividends don't. The US withholds 15% on dividends paid to UK investors (30% without a W-8BEN form). That 15% drag is unrecoverable inside an ISA, which has no tax reclaim mechanism.

At a 1.3% yield on the S&P 500, the 15% withholding tax costs you 0.2% per year. That sounds trivial. Over 30 years on a £500,000 portfolio, it's roughly £38,000 in lost compounding. If your global tracker yields 2%, the annual cost rises to 0.3% — and over 30 years, that's over £57,000 handed to the IRS for no benefit.

By contrast, a FTSE 100 tracker yielding 3.5% inside an ISA keeps every penny. The £500 dividend allowance outside an ISA shelters most small investors' UK dividend income entirely. For a higher-rate taxpayer, the difference between UK dividends (taxed at 33.75% above the allowance) and foreign dividends (also taxed at 33.75%, but with 15% already gone) is stark: you're paying tax on money you never received.

This is not a small optimisation. It's a structural tax advantage that tilts the risk/reward calculation meaningfully towards UK equities for British investors — especially those maxing out their ISA allowance. The HMRC tax rates confirm that dividend tax rates for higher-rate taxpayers reached 33.75% in the 2025/26 tax year, making the withholding tax friction even more painful.

And this isn't just about dividends. The MoneyHelper website highlights that UK-listed investment trusts and OEICs are also exempt from the 15% foreign withholding tax drag that ETFs domiciled in Ireland or Luxembourg suffer from inside ISAs — a subtle but compounding advantage of staying onshore.