Why Your Bank Earns 8–12% on Your Money and Pays You 0.5%

Your savings account pays around 0.5% APY. Your bank lends that same money out at 8–12% — to businesses, mortgage holders, and credit card users. The 7–11% spread between what they pay you and what they earn is the foundation of modern banking.

This isn't a secret. It's just something most people never think to question.

How the Spread Works

When you deposit £10,000 into a current account, you're effectively lending that money to the bank. They pool deposits from thousands of customers and redeploy that capital into higher-yielding assets:

• Business loans: 6–12% interest
• Mortgages: 4–7% interest
• Credit cards: 18–29% interest
• Wholesale lending to other banks: 4–6% interest

The bank's cost of capital (what they pay depositors) is currently around 0.5–2%. Their return on deployed capital averages 8–12%. The difference is their operating margin — and the reason banking has been one of the most profitable industries in the world for 200 years.

This model works because of scale, trust, and regulatory protection. Deposits are insured. Banks have centuries-old relationships with borrowers. And until recently, there was no meaningful alternative for retail savers.

What Changed

DeFi — decentralised finance — replicated the core mechanics of bank lending on public blockchains starting around 2020. Platforms like Aave allow lenders to deposit stablecoins (dollar-pegged assets like USDC or USDT) and earn interest directly from borrowers, with no bank taking the spread.

The rates are determined by supply and demand. When borrowing demand is high, lending rates rise. When capital is plentiful, rates compress. Just like traditional markets — except the yield flows directly to the lender, not to a banking intermediary.

Current base lending rates on major DeFi protocols for USDC sit between 4% and 8% APY. With strategy layering — combining lending returns with liquidity provision fees and protocol incentives — yields of 10–20%+ have historically been achievable.

The Stablecoin Advantage

The critical difference between crypto speculation and stablecoin yield is price exposure.

If you buy Bitcoin or Ethereum, your returns depend on price movement. A 20% yield is meaningless if the underlying asset drops 50%. That's speculation.

Stablecoins maintain a 1:1 peg with the US dollar. USDC is backed by short-term US Treasury bills and cash held at regulated custodians (Circle). USDT is the most widely held stablecoin by volume. You deposit dollars, you earn interest, you withdraw dollars. No price exposure.

This is the mechanism your bank uses with your money. The difference is you're now the one capturing the return.

The Risks (and Why They're Manageable)

DeFi yield isn't risk-free — nothing is. The main risks are:

Smart contract risk. DeFi protocols run on code. If that code has a bug, funds can be lost. The mitigation is protocol selection: only deploying capital into protocols with years of live deployment history, independent audits, and substantial TVL (total value locked). Aave, for example, has operated since 2017 with over $10 billion in TVL and multiple independent security audits.

Stablecoin depeg risk. In 2022, TerraUSD — an algorithmic stablecoin — collapsed to zero. The lesson: not all stablecoins are equal. Fiat-backed stablecoins (USDC, USDT) with transparent, audited reserves are categorically different from algorithmic mechanisms. Our curriculum only covers fiat-backed or overcollateralised instruments.

Protocol/liquidity risk. Most stablecoin positions are fully liquid — you can redeem within 24–48 hours. Some strategies lock capital for fixed periods. Position sizing matters: never more than 25% of allocated capital in any single protocol.

A proper risk framework manages all three. That's what we teach.

The Opportunity Cost You're Already Paying

If you have £100,000 sitting in a 0.5% savings account, you're earning £500/year. The same capital deployed into a conservative stablecoin yield strategy at 6% returns £6,000/year. At 12%, it's £12,000/year.

The gap between £500 and £6,000 is £5,500 per year. Over five years, compounded, that's a meaningful difference in wealth — not from taking on equity risk, but from accessing the same yield mechanism your bank already uses with your capital.

The bank was never hiding this from you. They just had no incentive to tell you about it.

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Jordan Alexander is co-founder of Stablecoin Coach and founder of Agrippa Capital, a systematic macro and alternative investment hedge fund operating since 2016.

Nothing in this article constitutes financial advice. DeFi involves risk. Always maintain self-custody of your assets and seek independent legal and tax advice for your jurisdiction.