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For many Irish business owners, selling shares in their company is the moment where years of work are finally realised financially. Yet it is also one of the most misunderstood stages of the business lifecycle. The focus is often placed on achieving the highest possible price, but in practice, what matters is the amount retained after tax.

This is where many deals quietly lose value.

The starting point is Capital Gains Tax. In Ireland, CGT applies to the gain made on disposal, calculated as the difference between the sale proceeds and the original cost of acquiring the shares. On the surface, this seems straightforward. In reality, it is anything but.

The key issue is that most business owners only begin thinking about CGT once a deal is already in motion. By that stage, many planning opportunities have already passed. The structure of ownership, the timing of the transaction and eligibility for reliefs are often fixed, leaving limited room to improve the tax outcome.

One of the most valuable reliefs available is Retirement Relief. In the right circumstances, this can eliminate CGT entirely on the disposal of shares. However, the conditions are strict. The individual must meet specific age requirements, ownership thresholds and involvement criteria. Even small technical issues can disqualify a claim.

This is where assumptions can be dangerous. Many owners believe they qualify based on general understanding, only to find that the detailed conditions are not met. Issues such as shareholding structure, length of ownership or the nature of the company’s activities can all affect eligibility.

Entrepreneur Relief is another commonly referenced option. While it does not eliminate tax, it can reduce the rate applied to qualifying gains. Again, the challenge lies in the detail. Lifetime limits apply, and the qualifying conditions must be carefully reviewed. It is not automatic, and it is not universal.

Beyond reliefs, the structure of the transaction itself has a major impact. A simple cash sale is the most straightforward, but many transactions involve deferred consideration or earn out arrangements. These introduce complexity in terms of when tax is triggered and how the gain is calculated.

There is also a risk that sellers underestimate. Tax may become payable before the full sale proceeds are received. In an earn out scenario, where part of the consideration depends on future performance, this can create a mismatch between tax liability and cash flow.

Timing is another factor that is often overlooked. The timing of a disposal can influence how gains are taxed and how they interact with other income. In some cases, careful timing can improve the overall tax position. In others, poor timing can increase the liability.

It is also important to consider the wider financial context. The sale of shares does not happen in isolation. It sits within the broader financial position of the individual. Other income, investments and future plans all influence the optimal structure of the transaction.

A common mistake is focusing solely on the headline price. A higher sale price does not always translate into a better outcome if it results in a significantly higher tax liability. In some cases, a slightly lower price with a more favourable structure can result in a higher net return.

This is where early planning becomes critical. Engaging with advisers well in advance of a sale allows for restructuring, eligibility checks and alignment with personal objectives. It creates options, and in most transactions, options are where value is found.

There is also a behavioural element. Once negotiations begin, attention shifts to deal terms, timelines and closing conditions. Tax becomes a secondary consideration. By that point, it is often too late to make meaningful changes.

Selling shares is not simply a transaction. It is a transition. It marks a shift from building value to realising it. Ensuring that this transition is managed effectively requires a clear understanding of both the commercial and tax implications.

The difference between a well planned exit and a reactive one can be substantial. Not in theory, but in the actual amount retained.

That is where the real outcome of the deal is determined.

Disclaimer: This article is based on publicly available information and is intended for general guidance only. While every effort has been made to ensure accuracy at the time of publication, details may change and errors may occur. This content does not constitute financial, legal or professional advice. Readers should seek appropriate professional guidance before making decisions. Neither the publisher nor the authors accept liability for any loss arising from reliance on this material.