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Date
Rate
3.73
3.73
3.73
3.73
3.73
3.73
3.73
3.73
3.73
3.73
3.97
3.97
3.97
3.97
4.22
4.22
4.21
4.46
4.46
4.46
4.70
4.70
4.70
4.95
About SONIA
SONIA is the sterling overnight index average — the main sterling risk-free rate (IUDSOIA). Current: 3.73% on Sep 16, 2026. The Bank of England publishes it; it does not set it. Transaction-based overnight market rate, including the 2018 reform, from 1997.
Chart and long-run stats use month-ends; the headline is the latest daily print. From Jan 31, 1997 to Sep 16, 2026 (357 months): mean 2.89%, median 3.43%; low 0.04% (Dec 31, 2020), high 8.61% (Apr 30, 1998). Not Bank Rate, and not a mortgage or savings rate.
Source: Bank of England Statistical Database, series IUDSOIA (SONIA). Licence: SONIA data licensed under the Open Government Licence v3.0 and copyright the Governor and Company of the Bank of England. The trade marks “Bank of England” and “SONIA” are registered trade marks of the Bank of England (terms). Files: data/raw/boe-sonia.csv.
Reading the figures
SONIA is a sterling reference rate based on unsecured overnight transactions, replacing sterling LIBOR in that benchmark role. Its history includes the April 2018 reform; it is published by the Bank of England, not set as a policy rate.
Read the latest value together with its observation date. The change compares it with the previous observation; when a policy rate is unchanged, the last actual move is shown where available. Percentage points measure the difference between two rates; a percentage change measures that difference relative to the earlier value. The summary statistics describe the history used on this page, not a forecast or a separate official aggregate.
The chart and table present the same series, with the newest table entries first. Range controls filter the chart without changing the data or recalculating the summary statistics. Explore enables zoom and pan. A policy rate, a market benchmark and a retail survey average are different measures; none is a personal loan or deposit offer.
About these rates
The deposit facility rate applies to banks’ overnight deposits with the Eurosystem. The ECB Governing Council sets it. €STR, shown separately, measures unsecured overnight borrowing in the euro market.
This page brings together central-bank policy rates, overnight market benchmarks such as SONIA, €STR and CORRA, and New Zealand lending and deposit rates from RBNZ surveys. These measures serve different purposes and are not interchangeable. Each series links to its history, definition, source and licence.
Choosing a country changes the order of the series, not their values or coverage. Euro-area countries share the ECB series; the site does not create national policy rates for them. Figures come from official files and are republished without alteration. Missing data is not estimated. Retail lending and deposit rates are available only for New Zealand. Readings may lag their source and are not financial advice.