Stage 2 · Lesson 6 of 7

Untaggable and shared spend

Some cost can never carry your tags: , taxes, some data transfer, , commitments bought centrally, and shared platforms such as a cluster or a central logging account. Do not chase 100% tag coverage.

Instead, report how much cost is allocated, how much is shared on purpose, and how much is simply untagged. Handle with a split rule (next stage) and untagged cost by finding the owners of the biggest items each month.

Common trapquietly leaving untagged cost out of team reports, so the totals never add up to the .

A question to check yourself, an AI practice session and 1 cheat sheet entry come with the full roadmap. Unlock

Resources for this stage

Start with· follow one of these

CourseFree
Microsoft Learn FinOps modules
Microsoft · Beginner
Free: the "Understand cloud usage and cost" unit of Adopt FinOps on Azure
BookPaid
Cloud FinOps, 2nd edition (O'Reilly)
O'Reilly Media · Intermediate · Paid book
Paid: the chapters on allocation and tagging strategy explain the reasoning behind a good policy

Practise

Microsoft FinOps toolkit
Free sample cost exports to practise queries on, whichever cloud you chose
DuckDB Documentation
Query a billing CSV or Parquet file with SQL on your laptop, no database to set up

Keep handy

Microsoft Cost Management documentation
The official Cost Management, Billing and Advisor docs for every Azure tool named in this stage
FOCUS: the FinOps Open Cost and Usage Specification
Learn the common column names now; they make every provider's export easier to read

Also worth your time

Tutorial: Create and manage Cost Management exports (opens in a new tab)Read
Datasets, schedules, formats and how to backfill past months
Kimball Dimensional Modeling TechniquesGo deeper
If you will build cost data models, the classic patterns for facts and dimensions apply directly