There seems to be some sort of bug in Power Bi that has been around for ages. For Line and Stacked column charts it seems to ignore the formatting options when using a live connection to a SSAS tabular model . So a measure formatted in the TM as a percentage comes through as a decimal in these charts . I know this is a bug in Power Bi because if you switch in any other visual it doesn't do this. Also the table view of the Line and Stacked column chart shows it properly formatted as a percentage - just not on the chart itself. Any idea what happening or when this will be fixed ?