Cloud Cost Optimization

Cost Allocation for Multi-Tenant SaaS: From Tags to Per-Customer P&L

4 min read

Per-customer cost visibility is the foundation of healthy SaaS unit economics. Here is how to build it without rebuilding your billing platform.

  1. 01Tag every resource with tenant_id

    Enforced at the Terraform layer.

  2. 02Use Cost and Usage Reports (CUR)

    Athena over CUR data is the cheapest path to per-tag breakdowns.

  3. 03Apportion shared costs by usage signals

    Allocate shared resources by request count, storage GB, or compute seconds.

  4. 04Surface in Grafana, alert on outliers

    Daily refresh; PagerDuty on anomalies > 3σ.

5-Lever FinOps FrameworkFrom audit to optimization — week-by-week01RightsizingEC2 + RDSnWeek 1–202CommitmentsSavings PlansnWeek 303Idle AuditEBS, EIPs, NATnWeek 3–404Data TransferVPC EndpointsnWeek 5–705Cost AllocationPer-customernWeek 8–10Result: 38% cost reduction · $420K annualized savings · 99.97% uptimeReal engagement · B2B SaaS · 90 days
The 5-lever framework Ohveda used to cut a B2B SaaS client’s AWS bill by 38% in 90 days.

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