In pie charts in Reporting Services paginated reports, by default the first value in the dataset starts at 90 degrees from the top of the pie.
Chart values start at 90 degrees.
You may want the first value start at the top instead.
Chart values start at the top of the chart.
To Start the Pie Chart at the Top of the Pie
Click the pie itself.
If the Properties pane is not open, on the View tab, click Properties.
In the Properties pane, under Custom Attributes, change PieStartAngle from 0 to 270.
Click Run to preview your report.
The first value now starts at the top of the pie chart.