Why RLS protects sensitive data in Power BI - Why Use It

Introduction

Row-Level Security (RLS) helps keep sensitive data safe by controlling who can see what in your reports. It stops users from seeing data they shouldn't by filtering data based on their identity.

When you want sales managers to see only their region's sales data in a report.

When HR wants to share employee data but restrict access to salary details by department.

When a company dashboard needs to show financial data only to executives, hiding it from other staff.

When you have a shared report but want each user to see only their own customer information.

When you want to comply with privacy rules by limiting data visibility based on user roles.

Steps

Step 1: Open

- Power BI Desktop

Your report file is ready for editing

Step 2: Click

- Modeling tab

Modeling options appear

Step 3: Select

- Manage Roles

The Manage Roles window opens

Step 4: Click

- Create

A new role is added for defining filters

Step 5: Type

- Role name box

Role is named (e.g., 'SalesRegion')

Step 6: Define

- Table filter DAX expression box

Filter expression limits data rows for this role

Step 7: Click

- Save

Role is saved and ready to test

Step 8: Use

- View as Roles

Report shows data as filtered by the selected role

Before vs After

Before

Report shows all sales data for all regions to every user

After

Report shows only sales data for the user's assigned region, hiding other regions

Settings Reference

Manage Roles

📍 Modeling tab > Manage Roles

Create and manage roles that filter data for users

Default: No roles defined

Role filter expression

📍 Manage Roles window > Table filter DAX box

Define which rows of data are visible for the role

Default: No filter (shows all data)

View as Roles

📍 Modeling tab > View as Roles

Preview report data as a user with a specific role

Default: No role selected

Common Mistakes

Not defining any filter expression for a role

The role will not restrict data and users will see all data

Always add a filter expression that limits data rows for the role

Testing RLS without using 'View as Roles'

You cannot confirm if the filters work correctly without previewing

Use 'View as Roles' to check what data each role can see

Assigning users to roles only in Power BI Desktop

User-role assignments happen in Power BI Service, not Desktop

Publish the report and assign users to roles in Power BI Service

Summary

RLS protects sensitive data by filtering report rows based on user roles.

You create roles with filter rules in Power BI Desktop and test them with 'View as Roles'.

Remember to assign users to roles in Power BI Service after publishing.