Power BI vs Tableau: A Detailed 2026 Comparison

Power BI and Tableau can both connect to most data sources, model it, build interactive dashboards and share them securely. The differences are in how each does those jobs, how calculations behave, and how licences add up for a team. For a one-screen summary see the Power BI vs Tableau comparison; for a three-way view including Looker, see Power BI vs Tableau vs Looker. This guide goes feature by feature.

Concept by concept

If you know one tool, this table translates it into the other:

Authoring and platforms

Power BI Desktop is a free download that requires Windows 10 or later (Microsoft Learn: Power BI Desktop); Mac users author in the browser or in a Windows environment. Tableau Desktop installs on Windows and Mac (Tableau Help: install), which matters to teams on Macs.

The authoring styles differ too. Power BI starts from a visual type: choose a chart, then fill its field wells. Tableau starts from the data: drag fields onto rows, columns and the marks card, and the view forms around them, which many analysts find faster for open-ended exploration. Power BI's report pages, bookmarks and themes are strong for structured, repeatable business reports.

Data preparation and storage

Power Query is built into Power BI Desktop and shared with Excel, so many analysts already know it; the Power Query tutorial covers it. Tableau Prep is a separate flow-based tool included with Creator licences. For storage, Power BI's import mode loads compressed data into the model and DirectQuery sends queries to the source; Tableau's extracts and live connections play the same roles.

Calculations: DAX versus LOD expressions

This is where switching tools takes real effort. DAX measures are evaluated in the filter context of each visual cell; Tableau calculations work at the view's level of detail, with LOD expressions to compute at another granularity. The same customer-level average looks like this in each:

Avg Sales per Customer =
AVERAGEX ( VALUES ( Customer[CustomerID] ), [Sales] )

// a calculated field, then averaged in the view
{ FIXED [Customer ID] : SUM([Sales]) }

The important difference is filtering. The DAX measure respects every slicer and filter on the page. A FIXED expression ignores all filters in the view other than context filters, data source filters and extract filters (Tableau Help: LOD expressions). Filter a Tableau view to one year without making it a context filter, and FIXED customer totals still cover every year, a classic surprise for Power BI users. INCLUDE and EXCLUDE expressions, by contrast, are defined relative to the view: they add dimensions to, or remove them from, the view's level of detail. The DAX guide explains filter context from the Power BI side.

Row-level security

Power BI defines roles with DAX filters, often dynamic ones matching the signed-in user against a mapping table; row-level security in Power BI covers it. Tableau offers user filters mapped by hand, which it describes as convenient but high maintenance, and dynamic filters based on a security field and an entitlements table, which it recommends as more secure (Tableau Help: row-level security). The good designs look alike in both: a maintained table of who may see what.

Sharing and licensing

Power BI lists Pro at $14.00 and Premium Per User at $24.00 per user per month, paid yearly, with a free account and free Desktop (Microsoft: Power BI pricing), prices as listed in September 2026. On shared capacity, everyone added to a workspace needs Pro or Premium Per User; with Premium or Fabric capacity of F64 or larger, viewers can use a free licence (Microsoft Learn: workspace roles).

Tableau licenses by role (Tableau Help: site roles):

• Creator: connects to data in the browser, Tableau Desktop or Tableau Prep, creates data sources, and builds and publishes content.
• Explorer: works in the browser with existing published data sources, and can edit and publish from the web.
• Viewer: views and interacts with published views, subscribes and downloads images or summary data.

Check Tableau's current price list for each role, since prices vary by edition and change over time.

A worked cost example

Take a team of 5 report authors and 95 readers on Power BI shared capacity: all 100 need Pro, so 100 × $14.00 = $1,400.00 a month at list price, paid yearly. In Tableau, the same team would typically be 5 Creators and 95 Viewers, with a few Explorers if some readers edit in the browser, so the total depends on the role mix and the current price for each role. Run both calculations with your own numbers; the ratio of authors to readers usually decides which is cheaper. Very large audiences change the picture again, since Power BI capacity lets free-licence users view content.

How to decide

• Already on Microsoft 365, Teams and Azure? Power BI fits in with little friction.
• Authors on Macs, or exploration-heavy analysis? Tableau deserves a serious look.
• An existing Tableau Server or Power BI tenant? Migration costs usually outweigh feature differences.
• Mostly readers, few authors? Cost both licensing models with your real numbers.

Skills transfer well between them: data modelling, a clean star schema, visual design and knowing the business questions matter more than the tool. The calculation language is the main thing to relearn.

Power BI modelling, DAX, visualization and the Power BI service are covered in the Power BI course.

Sources

• Power BI pricing (Microsoft) — Microsoft
• Download Power BI Desktop (Microsoft Learn) — Microsoft Learn
• Roles in workspaces in Power BI (Microsoft Learn) — Microsoft Learn
• Download and install Tableau Desktop (Tableau Help) — Tableau Help
• Set users' site roles (Tableau Help) — Tableau Help
• Create level of detail expressions in Tableau (Tableau Help) — Tableau Help
• Restrict access at the data row level (Tableau Help) — Tableau Help