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SONIA rates

The FCA advises all GBP Libor users to transition to Sonia by the end of 2021.

Unlike Libor, Sonia only comes with one tenor: it measures the overnight cost of borrowing by taking an average of the previous day’s transactions.

In order to calculate floating interest rates for a multi-day period (e.g. a 3 month interest period on a loan or interest rate swap), each daily fixing of Sonia over that period must be compounded into a single rate. This compound rate can therefore be calculated on the last day of the interest period. The table below shows the compound Sonia rates for a range of different interest period lengths, with end dates as shown in the first column.

Data is refreshed on a daily basis, at 11am.

Compounded Sonia Rates

End Date ON 1M 3M 6M 12M
19/09/2019 0.7104% 0.7103% 0.7100% 0.7101% 0.7085%
18/09/2019 0.7110% 0.7103% 0.7100% 0.7100% 0.7085%
17/09/2019 0.7099% 0.7103% 0.7100% 0.7100% 0.7085%
16/09/2019 0.7080% 0.7104% 0.7100% 0.7100% 0.7085%
13/09/2019 0.7096% 0.7106% 0.7100% 0.7099% 0.7084%
12/09/2019 0.7091% 0.7105% 0.7100% 0.7099% 0.7084%
11/09/2019 0.7087% 0.7106% 0.7099% 0.7099% 0.7084%
10/09/2019 0.7096% 0.7106% 0.7099% 0.7099% 0.7083%
09/09/2019 0.7098% 0.7106% 0.7099% 0.7099% 0.7083%
06/09/2019 0.7099% 0.7106% 0.7099% 0.7098% 0.7083%
05/09/2019 0.7095% 0.7106% 0.7099% 0.7097% 0.7082%
04/09/2019 0.7099% 0.7106% 0.7099% 0.7097% 0.7082%
03/09/2019 0.7091% 0.7106% 0.7099% 0.7097% 0.7082%
02/09/2019 0.7103% 0.7104% 0.7099% 0.7097% 0.7082%
30/08/2019 0.7101% 0.7103% 0.7098% 0.7096% 0.7082%
29/08/2019 0.7113% 0.7102% 0.7098% 0.7096% 0.7081%
28/08/2019 0.7107% 0.7102% 0.7097% 0.7096% 0.7081%
27/08/2019 0.7116% 0.7102% 0.7097% 0.7096% 0.7081%
23/08/2019 0.7110% 0.7099% 0.7096% 0.7095% 0.7080%
22/08/2019 0.7127% 0.7098% 0.7096% 0.7095% 0.7080%

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