Treasury System UAT: Why It Fails and How to Fix It

User acceptance testing is where more treasury management system implementations run into serious difficulty than at any other stage. This is not because UAT is inherently the most complex part of a TMS implementation — it is not. It is because UAT is where the accumulated consequences of earlier decisions surface all at once. Configuration decisions that were deferred, integration issues that were not fully resolved, bank connectivity that was assumed to be working — all of them show up in UAT. And by the time they do, the programme is usually under schedule pressure, which is exactly the wrong environment in which to run rigorous testing.

The Most Common UAT Failures

Insufficient test coverage. The most frequent UAT failure is a test plan that does not adequately cover the organisation's actual treasury processes. Generic test scripts provided by the system vendor test system functionality, not business process. A test that confirms a money market deal can be entered does not confirm that it flows correctly through to the general ledger, generates the correct accounting entries, and appears correctly in the next-day cash position. End-to-end process testing requires the organisation's own business scenarios, not vendor templates.

Wrong people doing the testing. UAT should be run by the people who will use the system in production — the treasury analysts and treasury managers who understand what the correct output should look like. When UAT is delegated to IT teams or to implementation consultants who already know the system, defects that would be immediately apparent to an experienced treasury user are missed. The treasury team must be actively involved in testing, not just available for questions.

Inadequate defect management. UAT generates defects. That is its purpose. The critical discipline is managing those defects effectively: logging them consistently, assigning severity levels that reflect actual business impact, tracking them through to resolution, and retesting systematically. Programmes that manage defects through email threads and shared spreadsheets lose track of what has been fixed, what has been deferred, and what has been reintroduced by subsequent configuration changes.

Time pressure leading to deferral. When a programme is behind schedule, the temptation is to accept UAT sign-off with open defects that are classified as low priority and deferred to post-go-live. This is a risk that is consistently underestimated. Defects that appear low priority in isolation frequently interact with each other in production to create significant operational problems. The cost of resolving defects post-go-live — in consultant time, in operational disruption, and in finance team effort — is materially higher than resolving them pre-go-live.

What Good UAT Design Looks Like

Effective UAT for a treasury management system is built around end-to-end business process scenarios, not individual system functions. Each scenario follows a transaction or process from its point of origin to its final output: a foreign exchange deal from trade entry through to settlement, accounting, and position update; a cash pool from daily sweep through to intercompany position reporting; a payment batch from creation through approval, transmission, and bank confirmation.

Test scenarios should be built from actual historical transactions where possible — real deals, real amounts, real counterparties — so that expected outputs can be verified against known results. This is more preparation work than building from synthetic test data, but it produces far more reliable test results.

Each test scenario should have explicit pass criteria defined before testing begins. The question is not whether the system produced an output, but whether the output is correct. Correct means matching the expected accounting treatment, the expected cash position impact, and the expected reporting presentation.

Managing Defects Effectively

A defect log that is actively maintained and visible to the full programme team is the single most important tool in UAT management. It should record: what was tested, what the expected result was, what the actual result was, the severity assigned, who is responsible for resolution, and the current status. It should be reviewed in daily or every-other-day defect triage calls during active UAT periods.

Severity classification matters. A defect that prevents any money market deal from settling is a blocker. A defect that produces an incorrect report format is significant but does not block go-live. A defect that causes a cosmetic display issue is low priority. Treating all defects as equal creates noise that obscures the critical issues.

When to Bring in External UAT Support

For programmes where UAT has run into difficulty — high defect volumes, poor defect management, schedule pressure leading to shortcuts — external resource with experience of running TMS UAT on multiple programmes can make a material difference quickly. An experienced implementation consultant can assess the UAT situation, identify which defects are genuinely blocking and which can safely be deferred, restructure the defect management process, and drive the resolution of critical issues in a way that a stretched internal team cannot.

RG Treasury provides senior implementation consultants with direct experience of managing complex TMS UAT programmes. Contact Sales@rgtreasury.com to discuss your programme.