Reviewed by: MyTaxRebate Team on 10 Mar 2026 | Authority: s.865 TCA 1997
Quick Answer
If Revenue reduces or denies your tax back claim, you have formal appeal rights in Ireland. Most denials or reductions arise from insufficient documentation, incorrectly claimed reliefs, or errors in the original submission - not from disputes about the underlying entitlement. The first step is always to understand why the claim was reduced before deciding whether to appeal. Under s.865 TCA 1997, Revenue must process valid claims - where a claim is correctly supported, a denial can be challenged through Revenue's internal review process or, ultimately, through the Tax Appeals Commission. MyTaxRebate manages the appeal process on your behalf, including correspondence with Revenue and preparation of additional supporting documentation.
What This Page Covers
- ✓The most common reasons a tax back claim is reduced or denied
- ✓How to obtain Revenue's explanation of the decision
- ✓Revenue's internal review process (the first step in any appeal)
- ✓When to escalate to the Tax Appeals Commission
- ✓How MyTaxRebate manages the appeal and additional documentation process
Key Facts at a Glance
- ✓Legal basis: s.865 TCA 1997 (right to refund) + Tax Appeals Commission Act 2015 (formal appeal rights)
- ✓Most common reason for denial: insufficient documentation for expense claims
- ✓First step: request written explanation from Revenue and submit additional evidence
- ✓Revenue's internal review process (myEnquiries or agent portal) resolves most disputes
- ✓Formal Tax Appeals Commission process: available if Revenue internal review does not resolve the issue
- ✓Time limits apply: formal appeals must generally be lodged within 30 days of the Revenue decision
- ✓Backdate up to four years - in 2025, claim for 2022, 2023, 2024, and 2025
Why Tax Back Claims Are Reduced or Denied
Most tax rebate denials in Ireland are not disputes about whether you are entitled to a refund - they are disputes about the evidence supporting the specific reliefs claimed. The most common reasons for a reduced or denied claim are:
- Insufficient documentation: Revenue cannot verify the expenses claimed because receipts, Med 2 forms, or other required documentation was not included.
- Non-qualifying expenses included: The claim included items that Revenue's rules exclude (e.g. cosmetic procedures, gym memberships, routine dental check-ups).
- Calculation errors: The relief claimed was calculated at the wrong rate or applied to ineligible amounts.
- Duplicate claims: Revenue identified that the same expense had already been claimed through a prior submission (e.g. self-submitted via your Revenue record).
Step 1: Understand the Decision
Before deciding whether to appeal, you must understand why Revenue reduced or denied the claim. Revenue issues a notice of determination confirming the approved refund amount and, where different from what was claimed, an explanation of what was disallowed. When MyTaxRebate submits a claim, we receive Revenue's determination through the agent portal and review it against what was claimed. We contact you immediately if anything has been reduced or denied and explain what Revenue's position is.
Check Your Claim
MyTaxRebate can review your position and guide the next step.
How MyTaxRebate Manages Your Appeal
When a claim submitted by MyTaxRebate is reduced or denied, we manage the appeal process entirely. We review Revenue's determination, identify whether additional evidence can resolve the issue, compile the required documentation, and submit the internal review on your behalf. In the rare cases where a formal TAC appeal is required, we prepare the grounds of appeal and coordinate the process. You are kept fully informed at every stage.
The Distinction Between a Query and a Rejection
Most Revenue responses to tax back claims are queries rather than rejections. A query means Revenue requires additional information before approving the claim - additional documentation, clarification of a figure, or evidence of a qualifying expense. This is not a rejection and does not trigger the appeal process. Responding to a Revenue query promptly and completely typically resolves the matter and results in claim approval. A rejection occurs where Revenue determines the claim cannot be approved based on the information provided. MyTaxRebate responds to all Revenue queries on behalf of clients and escalates to the formal appeal process where genuine disagreements arise on points of law or fact.
Grounds for Appeal Under the Tax Acts
Under s.865 TCA 1997 and the general tax appeals framework, a worker can appeal a Revenue decision to deny or reduce a tax back claim where they believe Revenue has incorrectly applied the law or misinterpreted the facts. Grounds for appeal typically include: Revenue has incorrectly determined that a qualifying expense does not meet the legislative criteria; Revenue has applied the wrong tax credit value or rate; or Revenue has denied a credit that the claimant demonstrably qualifies for. The appeal must be grounded in a specific legal or factual dispute - Revenue's decision to require supporting documentation is not grounds for appeal unless the documentation was correctly provided and still rejected.
Practical Steps After a Revenue Decision
When Revenue issues a decision on a tax back claim, the first step is to review the decision notice carefully to understand the specific reason for the denial or reduction. In many cases, the issue can be resolved by providing additional documentation without a formal appeal. Where the decision appears to be based on an incorrect legal interpretation or a factual error, the next step is a written request for Revenue to review the decision internally. If the internal review upholds the original decision and you believe it is wrong, a formal notice of appeal to the Tax Appeals Commission can be submitted within 30 days of the final Revenue determination.
One of the most important things to understand about appealing a Revenue decision in Ireland is that new evidence can often be presented at any stage of the process. If Revenue rejected your claim because you did not supply sufficient documentation, gathering and submitting that documentation through your Revenue record or by correspondence may resolve the matter without a formal appeal. Revenue's Customer Services division can review rejected claims where additional information is provided, and many disputes are resolved at this stage before the Tax Appeals Commission becomes involved.
Where a formal appeal to the Tax Appeals Commission is necessary, the process is governed by the Finance (Tax Appeals) Act 2015. The Commission is independent of Revenue and can hear appeals on both factual and legal questions. Decisions of the Commission can be further appealed to the High Court on a point of law. Most taxpayers who reach the TAC stage will benefit from professional representation - a tax consultant or solicitor with experience in tax disputes can significantly improve the quality of the appeal submission and increase the likelihood of a favourable outcome.
Check Your Claim
MyTaxRebate can review your position and guide the next step.
Tax Scenarios
Scenario 1: Documentation Dispute Resolved
A worker submitted a claim for €2,800 in medical expenses across four years. Revenue reduced the claim to €1,600, disallowing €1,200 attributed to a physiotherapy course they could not verify. MyTaxRebate contacted the physiotherapy clinic and obtained a signed invoice confirming the cost and qualifying nature of the treatment. We submitted this to Revenue through the agent portal. Revenue reinstated the disallowed amount and issued the full €2,800 in relief, generating an additional €240 refund.
Scenario 2: Incorrect Calculation by Revenue
Revenue applied the flat-rate nursing expense allowance at the wrong annual rate for one year in a four-year submission, reducing the relief by €85. MyTaxRebate identified the discrepancy, prepared a written technical submission to Revenue citing the correct annual rate from Revenue's own flat-rate schedule, and submitted via the agent portal. Revenue agreed, issued a revised determination, and added €17 to the refund (20% of the €85 difference). A small amount, but a matter of Revenue applying its own rules correctly.
Scenario 3: Formal Appeal to Tax Appeals Commission
A worker submitted a four-year claim that included nursing home fees for a dependent parent. Revenue initially denied the nursing home element, arguing the fees were paid by a sibling rather than the claimant. MyTaxRebate prepared a formal appeal to the Tax Appeals Commission, arguing that the claimant had reimbursed the sibling and was therefore the person who "paid" the expenses within the meaning of s.469 TCA 1997. The TAC agreed and Revenue was directed to process the relief. Refund on the nursing home element: €3,200.
Common Mistakes To Avoid
- ✗Not requesting Revenue's written explanation before deciding to appeal: Revenue's written notice tells you exactly what was disallowed and why. Appealing without understanding this leads to ineffective submissions.
- ✗Missing the 30-day appeal deadline: Formal TAC appeals must be lodged within 30 days of the Revenue determination. Missing this deadline forfeits the formal appeal right. Revenue's internal review (myEnquiries) is not subject to the same strict time limit but should be pursued promptly.
- ✗Attempting to claim the same item again without new evidence: Resubmitting the same claim without additional documentation will receive the same result. Appeals must address the specific reason for denial and provide new or additional evidence.
- ✗Including non-qualifying expenses in an appeal: If Revenue denied a claim because the expenses were non-qualifying (cosmetic, routine dental check-up), appealing on the basis that the expenses were genuinely incurred is unlikely to succeed. The grounds for appeal must address the legal basis for the relief, not just confirm the expenditure.
- ✗Not using a tax agent for a formal TAC appeal: While the Tax Appeals Commission does not require professional representation, the formal process involves legal arguments and technical submissions. MyTaxRebate's representation at this stage significantly improves the prospects of a successful outcome.
When This Does Not Apply
Key Takeaways
- ➤ Request Revenue's written explanation of any reduced or denied claim before deciding on next steps
- ➤ Gather additional documentation addressing the specific reason for denial before submitting a review
- ➤ Act within 30 days of the Revenue determination to preserve formal TAC appeal rights
- ➤ Use MyTaxRebate - we manage the entire appeal and review process on your behalf
- ➤ Most disputes are resolved through Revenue's internal review process without a formal TAC appeal
Check Your Claim
MyTaxRebate can review your position and guide the next step.
Frequently Asked Questions
Can I appeal a Revenue decision on my tax back claim?
Yes. If Revenue reduces or denies a tax back claim, you can appeal the decision. The first step is Revenue's internal review process, which involves submitting additional documentation or a written explanation of the grounds for dispute through myEnquiries (for self-submitted claims) or through your tax agent. If the internal review does not resolve the issue, a formal appeal can be lodged with the Tax Appeals Commission (TAC) within 30 days of Revenue's final determination. MyTaxRebate manages both the internal review and TAC appeal processes on behalf of clients.
Why might Revenue deny or reduce a tax back claim?
The most common reasons are: insufficient documentation to verify the expenses claimed (missing receipts or Med 2 forms), inclusion of non-qualifying expenses (cosmetic procedures, routine dental check-ups), calculation errors (wrong rate applied), or duplicate claims where the same expenses were already processed through your Revenue record. Understanding the specific reason is the essential first step before deciding how to respond.
What is the Tax Appeals Commission in Ireland?
The Tax Appeals Commission (TAC) is an independent statutory body established to adjudicate disputes between Revenue and taxpayers. It was created by the Tax Appeals Commission Act 2015. If a taxpayer disagrees with a Revenue determination after the internal review process, they can lodge a formal appeal with the TAC. The TAC holds hearings or makes determinations on written submissions, and its decisions are binding on Revenue. Formal TAC appeals must generally be lodged within 30 days of the relevant Revenue determination.
How long do I have to appeal a Revenue tax back decision?
For a formal appeal to the Tax Appeals Commission, you generally have 30 days from the date of Revenue's determination. Revenue's internal review through myEnquiries or the agent portal does not have the same strict 30-day limit but should be pursued promptly. When MyTaxRebate manages a claim and Revenue reduces it, we initiate the review process immediately to ensure no appeal deadlines are missed.
How does MyTaxRebate help if my tax back claim is denied?
When a claim we submitted is reduced or denied, we review Revenue's determination immediately, identify whether additional evidence can resolve the issue, and prepare a written internal review submission on your behalf. We gather any additional documentation required (receipts, Med 2 forms, employer letters) and submit through the agent portal. In the rare cases where a formal TAC appeal is appropriate, we prepare the grounds of appeal and coordinate the process. You pay nothing additional for the appeal process - it is included in our standard service.
