Alphabet’s 100-Year Bond: A Loan That Outlives Us All

Technology companies usually measure time in product launches.  Investors measure it in quarters.  Alphabet – the parent company of Google – has decided to measure it in centuries.

The company is preparing to issue a 100-year bond in sterling. That means investors hand over money today, collect interest each year, and only get the principal back in 2126.

Two thousand, one hundred and twenty-six.

By then, today’s AI models will look like dial-up internet, and the executives signing off the deal won’t be around to see it.

Neither will we, but let’s not dwell on that.

So why would anyone agree to lend for that long?

And why would Alphabet want to borrow in a way that stretches beyond economic cycles, management teams, and most sensible forecasting models?  The answer lies in how very large companies raise money – and how very large investors think about time.

The Deal, in Plain Sight

Alphabet isn’t raising just one bond. It’s raising several – and it’s doing so in different currencies at the same time.

Alongside the 100-year sterling bond, it has issued $20 billion of bonds in US dollars.  There’s also a Swiss franc tranche in the mix. So, this isn’t a one-market affair. It’s a global fundraiser.

Why borrow in multiple currencies?

Partly because repeatedly tapping the same market can eventually push up costs. If Alphabet kept returning to the US dollar market and asking for tens of billions each time, supply could start to outpace demand. When that happens, borrowing becomes more expensive.

Spreading issuance across dollars, sterling and Swiss francs avoids that.  It also gives Alphabet flexibility to borrow in whichever market is offering the best deal. Right now, if you look at very long-term borrowing – especially something as extreme as 100 years – interest rates in sterling are more attractive than in US dollars. In simple terms, investors are willing to lend for a century at a lower rate in pounds than they are in dollars. So, if you can secure cheaper money for that long, it makes sense to issue the bond in sterling and lock that rate in.

Then there’s the investor angle.  UK pension funds and insurance companies have obligations stretching far into the future – they may be paying pensions and policies for decades to come. To match those long-term commitments, they prefer investments that also produce reliable income over very long periods. There are very few bonds in the UK market that run for 100 years and pay interest in sterling. By issuing one, Alphabet is giving these investors exactly the kind of long-dated, predictable asset they struggle to find.

The Legal Fine Print – Ordinary Terms, Extraordinary Time

At first glance, there is nothing revolutionary about the legal structure of Alphabet’s 100-year bond. It’s senior, unsecured, fixed-rate debt. Interest is paid annually. Principal is repaid in 2126. There will be early repayment mechanics. In format, it looks like any other vanilla capital markets bond.

What makes it fascinating isn’t the structure. It’s the timescale.

Because Alphabet sits comfortably in investment-grade territory, this isn’t a deal packed with intrusive financial tests. There are no quarterly leverage ratios to maintain. No maintenance covenants requiring constant compliance certificates and anxious calls with lenders. This isn’t private credit with supervision. Investors are backing the company’s scale, earnings power and resilience, not relying on tripwires.

Instead, they receive the classic protections.  There is a negative pledge. Alphabet promises that if it ever grants security over key assets to another lender, bondholders must be offered the same protection. It can’t quietly mortgage the family silver for someone else and leave century investors exposed.

There are merger and consolidation provisions. Alphabet can reorganise, merge, split divisions, rebrand, or reshape itself entirely. But the debt follows the surviving entity. The obligation doesn’t vanish simply because the corporate structure evolves.

There’s also likely a change-of-control clause. If ownership shifts in a way that materially alters the credit profile, investors may have the right to sell the bonds back. It’s not control over strategy but an exit ramp if the story changes too dramatically.

On a ten-year bond, these clauses feel routine. On a hundred-year bond, they are structural anchors.  Over a century, companies will transform. Divisions will be sold. Entire industries may emerge and disappear. Management teams will rotate dozens of times. The “successor” language ensures that, however the business mutates, someone remains legally bound by the original promise. The company can evolve and the obligation must endure.

Then there’s something called a make-whole call. This gives Alphabet the option to repay the bond early, as long as it compensates investors for the interest they would have earned in the future.  On a normal ten-year bond, this is just a practical feature. On a 100-year bond, it matters much more.  If interest rates fall significantly in the future – say 20 or 30 years from now – Alphabet could choose to refinance the debt more cheaply and pay this bond off early. Investors would receive compensation, but that compensation is calculated using today’s rules and assumptions, not whatever the world looks like in 2080. In other words, investors are protected – but only according to a formula agreed now, for a future no one can fully predict.

Lurking quietly in the background is the tax gross-up clause. Over 100 years, tax regimes will be rewritten many times. If future withholding taxes are imposed, Alphabet may have to increase payments, so investors receive the promised amount net of tax. It’s standard drafting. Over a century, it becomes a wager on legal and fiscal systems that haven’t yet been written.

There’s nothing flashy about these clauses. And that’s precisely the point.  When the maturity stretches to 2126, ordinary clauses carry extraordinary weight. The legal fine print becomes the only constant in a future that will almost certainly look nothing like the present.

AI, Capex and the Slightly Uncomfortable Scale of It All

Alphabet isn’t borrowing to spruce up its HQ or buy back a few shares to steady the mood. It’s borrowing against a building programme that is, frankly, enormous.

Big Tech and its suppliers are expected to spend somewhere between $660 and $700 billion on AI infrastructure this year. That’s not a rounding error. That’s a global construction effort with very good lighting and extremely expensive electricity.

Alphabet alone has signalled capital spending of up to $185 billion in 2026 – nearly double the previous year – to fund its Gemini AI systems and the data centres that make them work. Not the kind of thing you finance out of petty cash.

Issue a bond that matures in 2126 and today’s investment plans suddenly look rather more permanent.  A century bond doesn’t just say, “We’re excited about AI.” It says, “We’re betting this will pay for itself for decades.”

And investors aren’t just backing this year’s earnings. They’re backing Alphabet’s ability to keep evolving – repeatedly – without losing its footing.

Which is a rather bigger commitment than clicking ‘update’.

A Very Small Club

Century bonds aren’t unheard of. They’re just rare.

After the financial crisis, when interest rates were scraping along the floor, a few governments decided to lock in cheap money for as long as possible. Austria did it. Argentina did it – with rather more drama.

On the corporate side, the club is smaller still.

In sterling markets, only a handful of names have ventured that far. The University of Oxford. EDF. The Wellcome Trust. Institutions with the sort of longevity that makes a hundred years feel modest.

Technology companies, by contrast, tend to stop at forty. IBM issued a 100-year bond back in 1996, but that remains the outlier rather than the template.

So, a sterling century bond from Alphabet – a cash-rich, highly rated tech giant – changes the shape of that very long end of the market. Investors who once lent to libraries and power stations are now lending to data centres.

The Last Word

Buying a 100-year bond sounds grand. In reality, it’s a very long bet on things that rarely behave.

Start with interest rates. The longer the bond, the more sensitive it becomes. A ten-year bond might wobble when rates move. A hundred-year bond can swing sharply. When cash flows run to 2126, small shifts in expectations can cause big price moves.

Then there’s inflation. Over a century, it won’t glide along neatly. It will rise, fall, shock, and reset more than once. A yield that feels comfortable today could look meagre in one decade and generous in another.

And that’s before credit risk. Alphabet will face regulators, rivals, new technologies and cycles we can’t yet imagine. The legal protections help, but they can’t foresee every twist.

A century bond is a bet on Alphabet’s ability to adapt again and again without losing its balance.

It’s also a bet that the legal and financial systems enforcing the contract will still be standing long enough to matter. It’s what happens when time becomes the main risk.