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White Paper . Sub Capacity Licensing

The IBM Sub Capacity Licensing Guide.

A 40 page enterprise guide to the IBM sub capacity programme. ILMT deployment, eligible products, the PVU and VPC measurement basis, audit positions, and the path to a clean position. Written by senior advisors who have closed sub capacity defences in the Fortune 500.

Pages
40
Time to read
55 min
Updated
Q2 2026

What is inside.

  • The sub capacity programme rationale and IBM's contractual basis.
  • The ILMT deployment, the bundle file, and the quarterly report cadence.
  • Eligible products list, including the products that look eligible but are not.
  • The PVU measurement basis on x86 and Power, and the VPC basis under Cloud Pak.
  • Audit positions IBM defends and the counter positions a buyer can take.
  • Sub capacity coverage assessment template and the operational governance model.
  • Multi cloud and container patterns and how the rules apply to each.
  • The path to a clean position when coverage has lapsed.

Who this is for.

  • The Software Asset Management lead operationally accountable for IBM sub capacity.
  • The IT Finance owner of the IBM support base.
  • The Procurement lead negotiating the next IBM renewal.
  • The Audit Defense lead facing an IBM audit notice.
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Independence statement. IBM Licensing Experts is an independent advisory firm. We are not an IBM Business Partner, reseller, or affiliate. We have no resell margin tied to our recommendations. This guide reflects our reading of IBM published terms and current customer practice. Read more on why independence matters.
Table of contents

The eight chapters in this guide.

1. The sub capacity programme.

Why IBM introduced sub capacity, the contractual basis, and the operational obligations on the buyer side.

2. ILMT in production.

The deployment architecture, the bundle file, the quarterly report obligation, and the most common implementation failures.

3. Eligible products.

The eligibility list, the products that look eligible but are not, and the version boundaries that matter.

4. The PVU and VPC basis.

The processor value unit table, the virtual processor core basis, and the measurement methodology on x86, Power, and container platforms.

5. Audit positions.

The positions IBM defends in audit and the counter positions the buyer can take.

6. Coverage assessment.

The template for assessing current coverage and the operational governance model that keeps it sound.

7. Container and multi cloud.

The IBM License Service replaces ILMT for Cloud Pak deployment. The rules for multi cloud and hyperscaler deployment.

8. The clean position.

The path to a defensible position when coverage has lapsed, and the renewal moments that close the work.

Appendix.

Sample ILMT report, eligible products excerpt, audit response template, and a glossary.

Related expertise

Where this guide connects.

The sub capacity programme is the operational layer beneath the entire PVU portfolio. The work on this page connects directly to the expertise on sub capacity, the ILMT deployment work, the PVU optimization programme, and the Passport Advantage renewal advisory.

For container based deployment the work shifts onto the Cloud Paks and Red Hat pages. For audit defense, see audit defense. For the renewal economics, see negotiation.

Related white papers

The connected papers in the series.

ILMT Deployment Playbook

A 32 page guide to deploying ILMT in production environments.

Read the guide

PVU Optimization Strategies

Reduce PVU exposure through architecture and workload placement.

Read the guide

IBM Audit Defense Playbook

The end to end audit defense engagement structure.

Read the guide