conversion of foreign currency income received

For Self Assessment, should I convert the USD saving income month by month, using the Official HMRC Foreign Exchange Monthly rates?

Hi,

Under the terms of Self Assessment, HMRC does not provide an official exchange rate. instead, the onus is on the individual to use a just and reasonable exchange rate. For your convenience, there are exchange rates here:

Exchange rates from HMRC in CSV and XML format

for older rates here:

Foreign exchange rates and spot rates: 1 January 1989 to 31 March 2009

You are free to use any of the supplied rates or one of your own choosing. 

Thank you.