Hosters who have been through an end customer style audit sometimes assume a SPLA audit will feel similar: a request for data, a reconciliation of deployment against entitlement, a number to negotiate. It does not work that way. SPLA is Microsoft's monthly licensing program for hosters, managed service providers, and outsourcers that deliver Microsoft software to external customers, and it is pay as you consume. That single fact, that you license by what you consume each month rather than by what you own, reshapes the audit entirely. This article explains the differences that matter and what they mean for how you defend.
A snapshot versus a film
An end customer audit is essentially a snapshot. It asks what you have deployed against what you are entitled to, and produces an Effective License Position at a point in time. A SPLA audit is a film. Because compliance is verified for every monthly reporting cycle, not just the current position, the audit examines each month across a 36 month lookback. You are not defending a position. You are defending three years of positions, one month at a time.
Who runs it and with what authority
A SPLA audit is conducted by a Big Four firm acting as an independent third party under the audit clause in the Microsoft Business and Services Agreement. That firm has broad authority to request deployment records, server configuration data, customer contracts, and usage logs. The breadth matters. Because the program is consumption based and customer facing, the auditor can reach into how you mapped each reported figure to the customers you served, not just what you ran.
You report, so the gaps are reporting gaps
In SPLA you apply the Services Provider Use Rights, the SPUR, and report SAL or processor counts each month. Because you self report monthly, the exposure that an audit surfaces is almost always a reporting gap rather than a simple license shortfall. Misapplied SPUR drives under reporting, which is compliance risk, and over reporting, which quietly wastes margin. The audit looks for months where what you reported does not match what you ran, and every such month is a finding.
Back fees and uplift are two different things
The financial structure is also distinct. When under reporting is found, back fees are charged at the price file rate for the months in question, and those back fees are not negotiable. Sitting on top of them is a penalty uplift, which ranges from 25 to 125 percent depending on the severity, duration, and nature of the under reporting, and the uplift is negotiable. Knowing which part of the demand is fixed and which is open is the foundation of any SPLA settlement, and it is set out in detail in back fees versus penalty uplift in SPLA.
The differences at a glance
The table contrasts the two audit types on the points that change your approach. It is indicative and meant to orient, not to cover every case.
| Dimension | End customer audit | SPLA hoster audit |
|---|---|---|
| What is checked | position today | every month, 36 month lookback |
| Licensing basis | owned entitlement | monthly consumption |
| Typical gap | deployment over entitlement | reporting accuracy |
| Penalty mechanic | 125 percent at 5 percent unlicensed | back fees plus 25 to 125 percent uplift |
| Core defense | rebuild the ELP | reporting discipline |
Indicative comparison of the two audit types, not a quoted case.
Why the defense is structural, not reactive
Because the audit reviews every month, the strongest defense is built into how you operate, not assembled after the letter arrives. Reporting discipline is the structural defense: monthly SAL reports submitted on time for every month, sealed daily authentication counts, customer mapping for each reported SAL block, product version mapping, and documented multi tenant isolation. There is only a short window to correct a reporting mistake, so the records either exist when the auditor asks or they do not. A hoster with clean monthly evidence defends three years quickly. One without it spends the audit reconstructing the past under pressure.
What this means for you
If you run SPLA, treat the difference as a planning instruction. The work that protects you is the monthly work, and the place an audit is won or lost is in the records you kept long before it began. Defending unreported parts of your estate is a specific and common challenge, covered in defending unreported customer estates.
The next step
The SPLA Audit Defense Guide explains the monthly mechanics, the lookback, and the reporting discipline that turns a three year review into a short one. Download the guide and use it to understand where your exposure actually sits before an auditor does.
A SPLA audit reviews every month.
Download the SPLA Audit Defense Guide for the monthly mechanics, the 36 month lookback, and the reporting discipline that shortens the review.
Download the SPLA Audit Defense GuideIf you would rather not face that alone, our SPLA audit defense team challenges the counting before back fees are set.