When the Coupon Wins: Reassessing FTSE 100 Income Stocks Against 2026’s Gilt Yields

For much of the period after the 2008 financial crisis, UK income investors treated large-cap dividend stocks as a substitute for bonds. The logic was straightforward: with gilt yields suppressed, a FTSE 100 portfolio yielding 4% or more looked like the only plausible source of dependable income. That assumption is being tested in 2026. Gilt yields have been volatile, but the direction of travel has been higher, and the risk-free alternative now offers a credible cash flow for the first time in years.

The trap is not that government bonds are always superior. It is that a gross dividend yield and a gross redemption yield are not directly comparable. Once tax, inflation, platform charges and the durability of the cash flow are taken into account, some popular income holdings look less compelling, and some gilts look more so. The right response is not to abandon equities, but to compare the two on a consistent basis.

Why the bond-proxy trade has lost its comfort

A bond proxy is an equity bought for income rather than growth. It works when yields are scarce and inflation is low. It struggles when yields rise and when the market questions dividend cover. In 2026, the FTSE 100 still contains many high-yielding names, but their appeal is no longer automatic. Banks are sensitive to credit costs and regulation; energy majors to commodity prices; tobacco to volume declines and excise policy; utilities to regulatory settlements and financing costs. Those risks do not disappear because the dividend has been reliable in the past.

The concentration problem matters as much as the individual risks. A UK income portfolio built from the usual suspects often leans heavily on financials, energy, tobacco and utilities. That may have felt diversified when bond yields were low and every dividend looked safe. It looks less diversified when a single sector shock can determine the portfolio’s income and total return.

A like-for-like comparison, not a headline yield

Start with the yield that matters. A dividend yield tells an investor what the company paid over the past year relative to the share price. A gilt’s gross redemption yield tells an investor what the bond is expected to return if held to maturity, assuming coupons are reinvested at the same rate. The two measures answer different questions. One is a board decision that can be cut; the other is a contractual payment from a sovereign issuer, subject to market price risk if the bond is sold before maturity.

Tax treatment then changes the ranking. Stamp duty reserve tax at 0.5% applies to purchases of UK shares, while gilts are exempt from stamp duty. Gilts are also exempt from capital gains tax for UK-resident individuals, although coupon income is taxable outside a tax wrapper. Dividends outside an ISA or SIPP face dividend tax after the modest dividend allowance. Platform fees apply to both, but the charging basis matters: a percentage fee on a direct gilt can erode a thin real yield, while a flat fee may be cheaper for larger portfolios. Tax rules can change, so the arithmetic should be refreshed rather than assumed.

Inflation is the final filter. A nominal gilt yielding 4.75% when inflation is 3% offers a real return of about 1.7% before costs and tax. A dividend stock yielding 4.5% with 3% dividend growth may offer a better real income stream, but only if the growth arrives. Index-linked gilts provide inflation protection directly, at the cost of lower starting income and greater price sensitivity.

Stress-testing the popular income names

Take an illustrative basket of FTSE 100 income favourites: HSBC, Shell, British American Tobacco, National Grid and Legal & General. This is not a recommendation list, but it reflects the sectors that have dominated UK income portfolios. Each has a different risk profile. The stress test should ask three questions: Is the dividend covered by free cash flow through a cycle? Can the business pass inflation through without damaging volumes? Does the portfolio rely on a handful of sectors for its income?

A 6% dividend yield with flat dividends and a 20% drawdown is not equivalent to a 5% gilt held to maturity. The gilt has price risk if sold early, but the equity has permanent capital risk and an income stream that can be reset. Conversely, an equity with modest yield but genuine dividend growth may beat a nominal gilt over a decade, particularly if inflation proves sticky. The comparison should be total return and income durability, not headline yield alone.

The after-tax arithmetic

Consider an illustrative £100,000 portfolio. Assume a 4.5% equity yield and a 4.75% gilt redemption yield. Gross income is £4,500 and £4,750 respectively. Inside an ISA, both are tax-free, but costs differ. A 0.25% platform fee costs £250; a 0.15% fund OCF costs £150; buying UK shares incurs 0.5% stamp duty, or £500 on a £100,000 purchase. A direct gilt avoids stamp duty, but dealing spreads and accrued interest matter.

Outside a wrapper, the comparison shifts. Dividend tax may be due on the equity income, while gilt coupons are taxed as savings income and may benefit from the personal savings allowance. Gilts’ capital gains are exempt for individuals, whereas share gains may be taxable. For a higher-rate taxpayer, the gross yield gap can narrow sharply. None of this is tax advice; it is a reminder that gross yields are a starting point, not a conclusion.

A practical framework

1. Match the asset to the liability. Money needed for known spending in the next few years belongs in cash or short-dated gilts, not in equity income.
2. Use wrappers first. An ISA or SIPP changes the after-tax comparison more than most investors allow for.
3. Compare real, after-cost yields. Subtract platform charges, fund costs and dealing friction before declaring a winner.
4. Stress-test the dividend. Ask what happens to income if earnings fall by a third and the payout ratio is already high.
5. Ladder gilts rather than guess duration. A ladder diversifies reinvestment risk and gives the portfolio known maturity proceeds.
6. Blend rather than switch. A mix of gilts, equity income and dividend-growth names is usually more robust than a binary bet.

The gilt-edged trap is binary thinking

Higher gilt yields are not a signal to sell every income stock. They are a signal to stop treating equities as bonds. For investors who need certainty of cash flow, a gilt ladder can now do a job that dividend equities were asked to do in the low-yield era. For investors who can tolerate volatility and want inflation-linked income growth, a diversified equity income portfolio still has a role. In 2026, the better answer is usually a deliberate mix, sized to the investor’s liabilities and taxed in the right wrapper.