Treasury Bills — The Dollar Dictionary

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Finance

Treasury Bills

Short-term government debt instruments maturing in weeks to a year — considered the safest investment in the world and used as the benchmark for the risk-free rate.

T-bills work differently from regular bonds: they're sold at a discount to face value rather than paying a coupon. You buy a £100 T-bill for £95, and at maturity (say, 6 months later) the government pays you £100. The difference (£5 on £95 invested) is your return — approximately 5.26% annualised. No coupon payments during the holding period — just the difference between purchase price and face value at maturity.

How to buy UK government T-bills: through the UK Debt Management Office (direct auctions), through a stockbroker (via the secondary market or gilt funds), or indirectly through money market funds that hold T-bills and pay daily interest (available through most investment platforms — an easy, liquid way to earn near T-bill rates without managing individual bonds). In the US, TreasuryDirect.gov allows direct purchase with no fees. The key advantage of T-bills over savings accounts: for large amounts above FSCS limits (£85,000 in the UK), T-bills carry zero counterparty risk — you're lending to the government, not a bank that could theoretically fail.

Buying a Treasury Bill is lending money to the government for a short period and getting paid interest for doing so — with essentially zero risk of not getting it back. The UK government has never defaulted on its debt in modern history. The US government hasn't either. T-bills are the financial world's equivalent of keeping cash under a mattress — except the mattress pays you 4-5% interest and is backed by the full faith and credit of a sovereign nation.

Real world: In 2023, when US Treasury Bill yields rose to 5%+ for the first time in 15 years, massive amounts of capital flooded into T-bills — from individuals, corporations, and even some institutional funds that previously had to chase riskier assets for yield. Apple famously holds tens of billions in short-term government securities as part of its cash management strategy. Warren Buffett's Berkshire Hathaway held over $150 billion in T-bills at one point — effectively earning 5% risk-free on cash while waiting for better investment opportunities.

💡 Treasury Bills are the safest yield available in any currency — the baseline that every other investment must beat to justify its additional risk, and the ideal home for cash you need to be safe but not idle.

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