The OBR is legally required to produce two forecasts in each financial year. Because of the cancellation of the November Budget, our Economic and fiscal outlook on 11 March will be our first forecast in 2019-20. We have written to the Chancellor setting out a number of options for the second forecast and he has decided to commission a supplementary update of the Budget forecast on March 13. This exchange of letters between the Chair of the OBR and the Chancellor provides further detail.