UK Treasury bills for business cash: short-dated government securities are not a savings account

UK Treasury bills are short-dated sterling obligations of the UK Government issued by the Debt Management Office. They are zero-coupon securities sold at a discount and redeemed at face value, with regular maturities around one, three and six months. For a corporate treasurer they can be a short-term investment, but they are securities rather than bank deposits.

T-bills are unconditional sterling obligations of the UK Government

The DMO says Treasury bills are sterling-denominated unconditional obligations of the UK Government with recourse to the National Loans Fund and Consolidated Fund.

They are zero-coupon eligible debt securities. Investors earn a return from the difference between purchase price and redemption value rather than a periodic interest coupon.

Regular tenders commonly use one, three and six-month maturities

The DMO says Treasury bills can legally run from one day to 364 days, while regular weekly tenders are typically around 28, 91 and 182 days.

Match maturity to the company's cash forecast. Money needed for next week's payroll should not be locked into a three-month security unless a liquid secondary-market route is deliberately available.

Most companies access T-bills through banks, brokers or investment platforms

DMO tenders involve recognised market participants rather than ordinary retail-style online banking. Corporate treasurers normally use financial intermediaries or investment accounts to purchase and hold securities.

Understand custody, dealing fees, settlement and minimum trade size before comparing yields with a business deposit.

Compare discount yield with deposit interest on the same time basis

A T-bill bought below face value produces a fixed redemption amount if held to maturity. Convert the discount into an annualised yield for comparison with bank deposits and MMFs.

Use net yield after custody and dealing cost. A slightly higher gross yield can disappear for smaller corporate balances if transaction costs are significant.

Market value can move before maturity

If the business sells a T-bill before maturity, the price can differ from purchase price as market yields change. Holding to maturity removes that sale-price uncertainty but ties up the cash until redemption.

Maintain a ladder rather than putting all surplus into one maturity if treasury needs regular liquidity.

Account for T-bills as securities, not deposits

Keep trade confirmation, ISIN, nominal amount, purchase price, maturity date and custodian statement. Reconcile redemption cash to the security ledger.

The bank account will show purchase and redemption, while the treasury register explains what asset existed between those dates. Ask the accountant about classification and tax treatment under the applicable standards.

Worked example: a company has £3 million it will need in roughly three months for a tax and acquisition payment. Buying a 91-day Treasury bill at a discount can lock in a known maturity value, but the company must make sure the maturity date falls before the cash is required. If the transaction date moves earlier, selling the bill before maturity introduces market-price and dealing considerations.

Use a maturity ladder where surplus cash extends beyond one date. Dividing £6 million across one-, three- and six-month maturities can create regular liquidity instead of one large block of cash returning on a single day. The ladder should still sit behind an operating buffer for obligations that cannot wait for security maturity.

Check custody and counterparty arrangements. The UK Government is the issuer, but the company can still rely on a broker, bank or custodian to execute and hold the security. Treasury policy should cover both issuer risk and the operational provider used to access the market.

Compare T-bill yield with the business's own borrowing cost. A company paying 9 percent on an overdraft should usually question the logic of investing spare cash at a lower yield while borrowing elsewhere, unless legal-entity, liquidity or ring-fencing constraints explain the position. Treasury should optimise net interest across the whole balance sheet.

Keep maturity proceeds on the treasury calendar. A bill redeeming on a Monday can fund Tuesday obligations, but only if settlement into the custodian or bank account is operationally understood. Confirm the redemption process rather than assuming maturity cash appears at midnight like a savings deposit.

Review marketability before assuming early liquidity. Treasury bills are negotiable securities, but a company still needs a broker or counterparty willing to buy at the prevailing price. The practical ability to sell is different from the legal fact that the security is transferable.

Use trade-date and settlement-date controls in the treasury ledger. Cash can leave on settlement rather than trade date, while yield calculations begin from the agreed purchase terms. Accurate dates prevent short-term securities from creating confusing month-end cash differences.