# Why 70% of UK Deals Fail Post-Close: The Data Silo Tax

**Category:** MA
**Author:** John Hotham
**Published:** 2026-05-21
**Read Time:** 8 min read

## Summary
M&A integration fails when data is siloed. Learn how to eliminate the 'Data Silo Tax' and protect your post-deal valuation.

## Full Content
<p>The deal closed. The VDR is locked. The integration team has been handed a pile of disconnected spreadsheets and told to "make it work." This is the exact moment your deal valuation starts to erode. We call it the <strong>Data Silo Tax</strong>, and it is the primary reason why 70% of UK M&A deals fail to deliver their intended synergy value.</p>

<h2>What Is Post-Merger Integration (PMI)?</h2>
<p><strong>Post-Merger Integration (PMI)</strong> is the complex process of combining and rearranging two or more organisations to realise the efficiencies and synergies that justified the transaction. In a mature operation, PMI is not a standalone project; it is the seamless transition of due diligence findings into operational reality.</p>

<figure><img src="https://static.prod-images.emergentagent.com/jobs/sched-2866d31f-92d1-431d-ac9f-1a8d77fdfd4c-1779350460043/images/0ad0e54724150ae6948fd3f9edd094a5ad3b86455d3c08c894c1db3c3774112c.png" alt="Two puzzle pieces failing to connect on a boardroom table" /><figcaption>Fragmented data creates a synergy gap that destroys deal value.</figcaption></figure>

<h2>The Cost of Fragmented Integration</h2>
<p>When your M&A team uses one tool, your GRC team uses another, and your PMO uses a third, you are paying the Silo Tax. Information is lost in translation. Risks identified during due diligence are never mitigated because they never made it onto the PMO's task list. Contractual change-of-control clauses are missed. Compliance gaps are ignored.</p>

<h3>Five Steps to Protect Deal Value:</h3>
<ul>
<li><strong>Bridge the VDR gap:</strong> Your due diligence data must flow directly into your operational systems. Do not let it die in a PDF report.</li>
<li><strong>Unify the workstreams:</strong> Manage your M&A milestones alongside your GRC and PMO data. If a compliance risk is found, it should automatically trigger an integration task.</li>
<li><strong>Audit the "New Normal":</strong> Use automated evidence collection to ensure the acquired entity is actually following your policies from Day 1.</li>
<li><strong>Statutory filing velocity:</strong> Ensure director changes and PSC updates are filed immediately to avoid Companies House penalties under the new ECCTA rules.</li>
<li><strong>Report to the board:</strong> Stop using PowerPoint to track integration. Use a live dashboard that shows the unified truth.</li>
</ul>

<p><strong>Simplif-i's M&A Pro+</strong> module was built by practitioners who have lived through the "scramble." We connect the dots so your valuation stays intact.</p>
<p>Join as a Founding Member for <strong>£149/month</strong>. It is a rounding error on your legal fees, but it is the difference between a successful exit and a write-down.</p>
<p><a href="https://simplif-i.com/signup">Start your free trial at Simplif-i.com</a></p>

---
Source: https://simplif-i.com/api/blog/readable/ma/why-uk-deals-fail-data-silo-tax
Web Version: https://simplif-i.com/blog/ma/why-uk-deals-fail-data-silo-tax
© Simplif-i - Unified Business Management Platform