If your company has recently been acquired, merged with another entity, or sits within a wider group, you've probably asked yourself: how does this affect our R&D tax credit claim?
Ireland's R&D tax credit is one of the most generous corporate incentives available, currently worth 30% of qualifying expenditure for accounting periods from January 2024 and increasing to 35% soon. But the group rules add real complexity around who claims, how much, and what happens mid-year.
How do R&D tax credits work for groups?
The first thing to understand is the basic criteria for claiming R&D tax credits. To qualify, the claimant must:
- Be a company within the charge to Irish tax
- Carry out qualifying R&D activities
- Carry out these activities within the EEA or UK
- In the case of an Irish tax resident company, the expenditure must not qualify for a tax deduction under the law of another territory
After the basics, the next thing to know is the 51% rule. Two companies are treated as being in the same group if one is at least a 51% subsidiary of the other, or if both are 51% subsidiaries of a third company. This is regardless of where each company is tax resident. The parent must also be entitled to 51% of distributable profits and 51% of assets on a wind-up (i.e., if the company is closed down and its assets are distributed).
Once you're in a group, the R&D credit isn't calculated company-by-company in isolation. Instead, qualifying group expenditure is the combined R&D spend across all group members in the relevant period.
There's an important caveat, though: companies not within the charge to Irish tax are excluded from this calculation. So, if your US parent company is doing R&D, that spend doesn't count towards the group pool.
Who actually claims the credit?
Group members can elect to allocate qualifying group expenditure however they wish, including giving the entire credit to one entity. But if no election is made, Revenue will allocate the credit proportionally based on each company's actual share of expenditure.
Revenue allocates using the formula Q × C/G, where:
- Q = qualifying group expenditure on R&D in the period
- C = amount of expenditure on R&D incurred by the company in the period when the company was part of the group
- G = group expenditure in the period
This flexibility is a great planning opportunity. If some group entities have larger corporation tax liabilities than others, it makes sense to direct credits towards them. It's worth reviewing the allocation strategy each year rather than letting it default to proportional.
How is the credit actually paid out?
Under the updated rules, companies can choose to offset the credit against their corporation tax (CT) liability or receive it as a cash payment from Revenue. Either way, it's paid in three annual instalments:
- First instalment: the greater of €75,000 (or the full credit if lower) or 50% of the credit
- Second instalment: 3/5 of the remaining balance
- Third instalment: the remainder
For each instalment, you specify whether you want it offset against tax liabilities or paid out in cash. The two options don't have to be the same; you can mix them across instalments.
One planning point worth flagging: electing to offset the first instalment against CT reduces your preliminary tax base for the following year. That can meaningfully improve cash flow, particularly for growing businesses.
Note: the minimum threshold will increase to €87,500 when the credit rate rises to 35%.
What happens when a company is acquired mid-year?
When companies merge or are acquired, there’s so much paperwork to get through that an R&D tax credit claim can slip through the cracks. This would be a sad outcome, as the R&D tax credit represents vital cashflow support.
When does the group relationship begin?
The first period for a newly acquired entity will generally be the first period of one year ending with the first common accounting period of the group. If the companies don't share an accounting period, they need to jointly elect which date to use.
Revenue’s allocation formula (Q × C/G) specifically allots for the R&D expenditure to be incurred in the period when the company was part of the group. In practice, this means pre-acquisition R&D spend is excluded from the group calculation.
Can the acquired entity still claim on pre-acquisition R&D?
Yes. The newly acquired entity can still claim in its own right for expenditure incurred before joining the group, provided the claim deadline hasn't passed. It's important to identify any unclaimed R&D at the point of acquisition and factor that into your timeline.
What if there's a trade transfer — does the acquiring company inherit the credits?
If a company stops trading and the acquiring or successor company continues the same qualifying R&D activities, the successor can step into the predecessor's shoes and claim the instalments it would have been entitled to. But the conditions are strict:
- Both companies must have been members of the same group across both the cessation and commencement of the trade
- The successor must continue the R&D activity for at least two years after the transfer
- The predecessor must not have already specified those instalments as overpayments or cash payments
If you're integrating an acquired business that has historic R&D credits in the pipeline, check instalment transfer eligibility early and build the two-year continuity requirement into your integration plan from day one.
A practical example: Company A acquires Company B mid-year
Company A, an Irish-resident tech firm, acquires Company B in April 2025. Company B has been running qualifying R&D activity since the start of the year and has €200,000 in qualifying expenditure. Both have accounting periods beginning 1 January.
The companies can only claim as a group for their first full year together. This will be for the 2026 year in this case, as the group’s first full year begins 1 January.
If the group wants to concentrate credits with Company A (which has the larger CT liability), they should make an election to that effect.
Record-keeping across the group
Every valid claim must satisfy two tests: the Science Test (is the activity qualifying R&D?) and the Accounting Test (are costs correctly tracked and attributable to qualifying activity?). Records must be contemporaneous; Revenue can and does request them after filing.
Group-level allocation doesn't reduce the documentation burden at entity level. Each company claiming must maintain its own records. If you're acquiring a business with historic R&D claims, make obtaining that documentation a standard part of due diligence. Gaps in records can invalidate claims, including future ones.
Key takeaways
- Track R&D expenditure at entity level from the date of group membership; pre-acquisition spend is excluded from the group pool
- Check instalment transfer eligibility on any trade transfer and plan for the two-year continuity requirement
- Make an explicit election on credit allocation; the default proportional method may not be best suited to your group
- Obtain the target company's R&D documentation as part of M&A due diligence
- Consider offsetting the first instalment against CT to improve cash flow in the following year
Ireland's R&D tax credit is one of the most valuable incentives available to innovative businesses, but the group rules require careful management, especially when structures are changing. Getting this right means more cash back in the business and less risk of an invalid claim.
If you'd like to understand how your group structure affects your R&D claim, get in touch with the Tax Cloud team.
