Buying a gilt: why the cash cost differs from the quoted price

A gilt price displayed as 96.50 does not mean that £10,000 nominal of the stock costs exactly £9,650 in total. Accrued interest, dealing costs and the settlement terms can change the cash required.

Understanding those lines helps you reconcile the quote with the contract note and avoid mistaking an interest adjustment for an unexplained charge. This guide uses a conventional gilt; index-linked securities have additional calculation features.

Start with nominal value rather than cash invested

The nominal amount identifies the face value of the holding. A conventional gilt's market price is normally quoted per £100 nominal, and it can trade above or below that amount.

The UK Debt Management Office's gilt guide explains the quotation convention and coupon payments. The amount repaid at maturity is linked to nominal value, not whatever price a particular investor paid in the market.

For £10,000 nominal at a clean price of 96.50, the price component is £9,650. For £5,000 nominal at the same quotation, it is £4,825. Confirm whether the dealing screen asks for a nominal quantity or a cash investment amount before entering an order.

Add the interest adjustment

Coupon payments occur on specified dates, while investors trade between them. Accrued interest helps allocate the payment between the seller's and buyer's holding periods.

The DMO glossary distinguishes the clean quotation from the dirty price used for the full price calculation. For an ordinary conventional-gilt trade, the dirty price incorporates the accrued-interest adjustment.

Suppose the clean price is 96.50 and accrued interest is an illustrative 0.75 per £100 nominal. The dirty price is 97.25. Buying £10,000 nominal therefore costs £9,725 before the broker's dealing fee.

If that fee is £15, the immediate cash debit is £9,740. The £75 interest adjustment and £15 dealing fee are different items. Neither should be described as a change in the gilt's coupon rate.

Do not count the next coupon as entirely new profit

Imagine the holding has a 2% annual coupon, paid in two equal instalments. On £10,000 nominal, each full six-month coupon is £100.

If the buyer has already paid £75 of accrued interest in the illustrative trade above, receiving the next £100 coupon does not represent £100 earned solely during their brief ownership. Part of the receipt corresponds to interest compensated to the seller in the purchase price.

This is a cashflow explanation rather than a tax calculation. Keep the contract note and income statement so the appropriate interest and tax treatment can be established without relying on a single account balance movement.

Check the settlement date and payment entitlement

The trade date and settlement date are distinct. Payment entitlement around an ex-dividend period depends on the applicable convention; buying just before a coupon date does not automatically secure that coupon.

The DMO explains that accrued interest can become negative, often described as rebate interest, during the ex-dividend period. Ask the broker to explain an unfamiliar negative line rather than assuming the statement is wrong.

When planning a near-term cash need, use the confirmed settlement and payment dates. A displayed maturity month or an order placed on a particular day is not enough to establish when usable money reaches your account.

Reconcile four lines on the contract note

A practical check records the security identifier, nominal amount, clean-price consideration, interest adjustment and dealing fee. Compare their total with the cash movement and the holding shown afterwards.

For the example, £9,650 plus £75 plus £15 equals £9,740. If the debit differs, check whether the executed price changed, the quantity was different or another disclosed charge applied.

Keep the illustration separate from a live order. Market quotations move, bid and offer prices differ, and a previous closing price may not be executable when you place a trade.

Assess the investment beyond the purchase arithmetic

A correctly reconciled trade can still be unsuitable for the money's purpose. Consider the maturity date, need to sell early, inflation, tax position and the role of the holding within the wider portfolio.

If you might sell before maturity, changes in market price remain relevant. A government obligation to make its scheduled payments does not promise that your interim sale price will equal your purchase cost.

Related reading covers managing investments yourself, the full costs of investing and planning around a cash lump sum. Before dealing, be able to explain both the total cash debit and when the expected receipts are due.