Transport for London (TfL) forecasts that the cost of relevant travel concessions for 2021-22 is between £110m and £130m. The proposed council tax increase will raise in the region of £43m, leaving between £67m and £87m to be covered by projected Congestion Charge income. TfL estimates that the June 2020 changes to the Congestion Charge would raise an additional £140m in 2021-22 if in place for the full year, compared to what would have been raised had the charge level and scope not be widened. The Congestion Charge increase was required by the Government in its agreement to fund TfL for the first half of the current financial year 2020-21.
Also, please see my response to MQ 2020/0148