Cost Allocation Tagging & Tag Enforcement
Make attribution automatic instead of archaeological — tag rules that apply at ingest across every provider, and a coverage number that tells you whether your IaC tagging policy is holding.
- Read-only access
- 14-day free trial
- No credit card required
- 5 min
- setup, per provider
- 90 days
- available history
- Same-day
- anomaly alerts
Daily spend by provider
$24,321 total
See the workflow in practice.
Read-only access, with nothing to install.
Billing integrations read cost and usage data without changing your provider resources. Permissions vary by provider; follow its setup guide. Claude usage uses opt-in OpenTelemetry, and custom sources use cost imports or scoped ingestion rather than a billing API.
How it worksCatch the spike the day it starts.
StackSpend learns what normal looks like per provider, account and service, then flags the day something breaks pattern, with a severity and an owner. Each one carries a lifecycle, so it gets closed.
How it worksOne message each morning. Nobody opens a billing portal.
Team plan and above
How it worksProduct examples are illustrative. Usage estimates and provider-reported costs are separate measures; availability varies by connected source.
Explore the data viewWhy is this spend hard to control?
- Tags applied after the fact are archaeology. By the time someone reconstructs who owned a resource, that person has changed teams and the spend is three months old.
- Tagging policy has no feedback loop. A Terraform rule requiring an owner tag is only as good as the exceptions nobody audits, and there is usually no number showing how much spend escapes it.
- Every provider has its own tagging model, and AI providers largely have no tagging concept at all.
- Taxonomies drift — team, Team, owner and squad all end up in use, each splitting the same spend differently.
Know what you are connecting.
The workflow
- 01
Tag rules match on provider, account, project, or service and apply your tag to every matching line item at ingest, including across the 90 days backfilled on connect. Rules carry a priority so a specific rule beats a general one.
- 02
One tag vocabulary spans every provider, so a team means the same thing whether the spend came from EC2, BigQuery, or an Anthropic key.
- 03
Unallocated spend is reported as its own bucket — the number your IaC tagging policy is actually judged on, visible weekly rather than at the next audit.
- 04
Tags drive budgets as well as reports, so attaching a budget to a tag gives the owning team its own ceiling and alerts.
The source
Billing and usage from your connected providers. Credential types and permission controls vary by provider.
Provider connection guidesThe limits
Provider reporting and scheduled sync determine freshness. Available history and attribution vary by source; review the setup guide for coverage. Alerts notify your team; they do not block requests or enforce a spending cap.
What we track
- Tag rules matched on provider, account, project, and service
- Tags applied at ingest, plus manual and API-applied tags
- Rule priority so specific rules override general ones
- Unallocated spend as an explicit coverage number
- Tag-scoped budgets and alerts
Who is this for?
- Teams that want daily visibility into spend without manually checking billing portals.
- Buyers replacing spreadsheets and fragmented native dashboards with one monitoring workflow.
- Operators who need read-only setup, alerts, and forecasting before overrun becomes month-end reality.
Evaluation checklist
- 01
Start a trial
Open a StackSpend workspace with no credit card required.
- 02
Connect with read-only access
Use the setup guide to connect the provider or workflow with the minimum permissions needed.
- 03
Review the first 90 days
Check history, alerts, anomalies, and forecast so you can decide whether the workflow is worth adopting.
How does StackSpend support this workflow?
Native tools provide provider-specific reporting and controls. StackSpend adds a shared monitoring workflow across connected sources.
AWS cost allocation tags, GCP labels, Azure tags
- Three tagging models with different key rules and no shared vocabulary
- Tags apply going forward only — activate late and history stays unattributed
- No coverage metric: untagged spend is absorbed into totals
- AI and developer-tool providers are outside the model entirely
StackSpend
- One tag vocabulary across cloud, AI, data, and developer-tool providers
- Rules apply to backfilled history, not just from today
- Unallocated spend is an explicit number, so policy has a feedback loop
- Tags drive budgets and alerts, not just reports
What do you get when you connect?
- Setup time
- Most teams can connect and validate setup in about 5-10 minutes.
- Access model
- Read-only credentials only. StackSpend does not modify provider resources or billing settings.
- Signals
- Daily Slack or email updates, anomaly alerts, and budget tracking in one workflow.
- History and forecast
- Historical spend context plus pace-to-forecast so overruns are visible before month-end.
Check the details before connecting.
Review connection permissions
Read the provider setup guides before sharing credentials.
Provider setup guidesSee the security details
How credentials, tenant isolation and data handling work.
Security and data handlingTalk to the team
Ask about your stack or requirements before connecting.
Contact StackSpendAbout Andrew DayCost Allocation Tagging & Tag Enforcement, answered
When is this workflow useful?
- A module default changes and new resources ship untagged for weeks
- Two teams adopt different tag keys for the same concept and the spend splits
- Cost allocation tags are activated late, leaving an unattributable gap
- An AI provider with no tagging concept becomes material and falls outside the taxonomy
How does StackSpend handle Cost Allocation Tagging & Tag Enforcement?
Cost allocation tagging labels cloud and AI resources with the team, product, or environment that owns them so spend can be attributed without manual reconstruction. The durable version enforces tags at provision time in your IaC — a Terraform policy or module default that refuses untagged resources — because tags applied after the fact never cover history. StackSpend does not provision infrastructure and so does not apply that gate; it is the feedback loop around it, classifying spend automatically at ingest across every provider and reporting an explicit unallocated-spend number that shows where the policy is leaking.
How do I enforce cost tags at provision time?
Enforcement belongs in your infrastructure-as-code, not in a reporting tool: a policy gate in Terraform (OPA or Sentinel, or a wrapper module that makes owner and environment required arguments) so an untagged resource cannot be created, plus provider-level rules such as AWS tag policies for anything provisioned outside IaC. StackSpend does not provision infrastructure and does not apply that gate — it is the feedback loop, reporting how much spend arrives untagged, which is the only reliable signal that the policy is leaking.
Do tags apply to historical spend?
Yes. Tag rules apply to the 90 days of history backfilled when you connect, not only to spend from the moment the rule was written. That is the difference from native cost allocation tags, which take effect from activation forward and leave everything before that date unattributable, so you can define the taxonomy after the fact and still get a complete picture.
What if two rules match the same line item?
Rules carry a priority and the highest-priority active rule wins, so a specific rule (this project, this service) overrides a general one (this provider) without writing mutually exclusive conditions. Individual line items can also be tagged manually or through the API when an exception does not deserve a rule.
For the current provider catalogue, see supported integrations.
Tomorrow morning: one number, in Slack.
Connect your providers today and follow spend, budgets and alerts in one place. Review provider permissions before connecting.