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Disputes and appeals by country

How a claimant in each of the five countries covered on this site can challenge a decision that reduces a research and development tax claim, which tribunal or court hears the dispute, and the first time limit that applies.

  • Rules as at
On this page
  1. Notes
  2. Sources

This page compares how a claimant can challenge a decision that reduces or refuses a research and development (R&D) tax claim in the five countries covered on this site. For each country it sets out the administrative step inside the tax authority, the independent tribunal or court that can hear the dispute, and the first time limit a claimant meets. Time limits are strict everywhere and vary with the type of decision, so the notes and the linked country pages give the detail. Each cell cites the same source as the matching country page. The page describes the rules only and makes no recommendation.

This table simplifies each country's rules for comparison. See the country pages for detail and sources. Last reviewed pending.

Country Administrative challenge Independent tribunal or court Key time limit
United States Written protest to the IRS Independent Office of Appeals; refund claims rejected as deficient are not eligible1Source 1Internal Revenue Service, Publication 5, Your Appeal Rights and How to Prepare a Protest if You Disagree (Rev. 4-2021), pages 1 to 6. https://www.irs.gov/pub/irs-pdf/p5.pdf (accessed 11 October 2026).2Source 2Internal Revenue Service, Research credit claims (Section 41) on amended returns frequently asked questions, introduction and questions 7 and 15 (page last reviewed or updated 1 October 2026). https://www.irs.gov/businesses/corporations/research-credit-claims-section-41-on-amended-returns-frequently-asked-questions (accessed 11 October 2026). US Tax Court, or a refund suit in a US District Court or the US Court of Federal Claims3Source 3Office of the Law Revision Counsel, 26 U.S.C. 6213, Restrictions applicable to deficiencies; petition to Tax Court, subsection (a), United States Code 2024 edition published by the Government Publishing Office. https://www.govinfo.gov/content/pkg/USCODE-2024-title26/html/USCODE-2024-title26-subtitleF-chap63-subchapB-sec6213.htm (accessed 11 October 2026).4Source 4Office of the Law Revision Counsel, 28 U.S.C. 1346, United States as defendant, subsection (a)(1), United States Code 2024 edition published by the Government Publishing Office. https://www.govinfo.gov/content/pkg/USCODE-2024-title28/html/USCODE-2024-title28-partIV-chap85-sec1346.htm (accessed 11 October 2026). 90 days to petition the Tax Court after a notice of deficiency; refund suit within 2 years of a notice of disallowance3Source 3Office of the Law Revision Counsel, 26 U.S.C. 6213, Restrictions applicable to deficiencies; petition to Tax Court, subsection (a), United States Code 2024 edition published by the Government Publishing Office. https://www.govinfo.gov/content/pkg/USCODE-2024-title26/html/USCODE-2024-title26-subtitleF-chap63-subchapB-sec6213.htm (accessed 11 October 2026).5Source 5Office of the Law Revision Counsel, 26 U.S.C. 6532, Periods of limitation on suits, subsection (a)(1), (2) and (4), United States Code 2024 edition published by the Government Publishing Office. https://www.govinfo.gov/content/pkg/USCODE-2024-title26/html/USCODE-2024-title26-subtitleF-chap66-subchapD-sec6532.htm (accessed 11 October 2026).
United Kingdom Appeal to HMRC, with an optional statutory review by an officer not involved in the decision6Source 6GOV.UK, Disagree with a tax decision or penalty, sections 2 "Disagree with a tax decision", 3 "Disagree with a penalty", 4 "Get a review", 5 "Delay payment during appeals and reviews" and 6 "Reasonable excuses". https://www.gov.uk/tax-appeals/print (accessed 11 October 2026). First-tier Tribunal (Tax), then the Upper Tribunal with permission on a point of law7Source 7GOV.UK, Appeal to the tax tribunal, sections 1 "Overview" (including "Close an enquiry"), 2 "Appeal to the tribunal", 3 "If you have a hearing" and 4 "The tribunal's decision". https://www.gov.uk/tax-tribunal/print (accessed 11 October 2026). 30 days from the decision letter to appeal to HMRC6Source 6GOV.UK, Disagree with a tax decision or penalty, sections 2 "Disagree with a tax decision", 3 "Disagree with a penalty", 4 "Get a review", 5 "Delay payment during appeals and reviews" and 6 "Reasonable excuses". https://www.gov.uk/tax-appeals/print (accessed 11 October 2026).
Ireland Settlement by agreement; Revenue's review procedures cover its handling of a case, not liability8Source 8Revenue Commissioners, Code of Practice for Revenue Compliance Interventions (effective 1 May 2022), sections 4.11, 4.11.1 and 4.11.2. https://www.revenue.ie/en/tax-professionals/documents/code-of-practice-revenue-compliance-interventions.pdf (accessed 11 October 2026).9Source 9Revenue Commissioners, Notes for Guidance, Taxes Consolidation Act 1997, Finance Act 2025 edition, Part 40A, sections 949I, 949O, 949V, 949Y, 949AO, 949AP and 949AQ. https://www.revenue.ie/en/tax-professionals/documents/notes-for-guidance/tca/part40a.pdf (accessed 11 October 2026). Tax Appeals Commission, then the High Court on a point of law8Source 8Revenue Commissioners, Code of Practice for Revenue Compliance Interventions (effective 1 May 2022), sections 4.11, 4.11.1 and 4.11.2. https://www.revenue.ie/en/tax-professionals/documents/code-of-practice-revenue-compliance-interventions.pdf (accessed 11 October 2026).9Source 9Revenue Commissioners, Notes for Guidance, Taxes Consolidation Act 1997, Finance Act 2025 edition, Part 40A, sections 949I, 949O, 949V, 949Y, 949AO, 949AP and 949AQ. https://www.revenue.ie/en/tax-professionals/documents/notes-for-guidance/tca/part40a.pdf (accessed 11 October 2026). 30 days after the notice of assessment10Source 10Revenue Commissioners, Notes for Guidance, Taxes Consolidation Act 1997, Finance Act 2025 edition, Part 41A, sections 959AF and 959AG. https://www.revenue.ie/en/tax-professionals/documents/notes-for-guidance/tca/part41a.pdf (accessed 11 October 2026).
Canada Written representations and CRA dispute resolution during a review, then a notice of objection11Source 11Canada Revenue Agency, The SR&ED Review Process: A Guide for Claimants (April 20, 2026), Step 3 (3.1 The CRA's review findings, 3.2 Dispute resolution process, 3.3 Formal CRA objection process) and Appendix A. https://www.canada.ca/en/revenue-agency/services/scientific-research-experimental-development-tax-incentive-program/technical-review-a-guide-claimants.html (accessed 11 October 2026).12Source 12Government of Canada, Income Tax Act, RSC 1985, c 1 (5th Supp), subsection 165(1). https://laws-lois.justice.gc.ca/eng/acts/I-3.3/section-165.html (accessed 11 October 2026). Tax Court of Canada, then the Federal Court of Appeal13Source 13Government of Canada, Income Tax Act, RSC 1985, c 1 (5th Supp), subsection 169(1). https://laws-lois.justice.gc.ca/eng/acts/I-3.3/section-169.html (accessed 11 October 2026).14Source 14Canada Revenue Agency, P148, Resolving your dispute: Objection and appeal rights under the Income Tax Act (P148(E) Rev. 25), sections on the objection review, time limits, collection of disputed amounts, extensions and appeals. https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/p148/p148-resolving-your-dispute-objection-appeal-rights-under-income-tax-act.html (accessed 11 October 2026). 90 days after the notice of assessment for a corporation to object12Source 12Government of Canada, Income Tax Act, RSC 1985, c 1 (5th Supp), subsection 165(1). https://laws-lois.justice.gc.ca/eng/acts/I-3.3/section-165.html (accessed 11 October 2026).
Singapore Notice of objection to IRAS; referral to the Technical Advisory Panel is possible during an R&D review15Source 15Attorney-General's Chambers, Income Tax Act 1947 (Singapore Statutes Online, current version), section 76(2), (2A), (3) and (4). https://sso.agc.gov.sg/Act/ITA1947?ProvIds=pr76- (accessed 11 October 2026).16Source 16Inland Revenue Authority of Singapore, IRAS e-Tax Guide: Research and Development Tax Measures (Eighth Edition, published 30 January 2026), paragraphs 13.2 to 13.5 and 13.7. https://www.iras.gov.sg/docs/default-source/e-tax/research-and-development-tax-measures-etax-guide_6th-edition.pdf?sfvrsn=1f38a2e8_27 (accessed 11 October 2026). Income Tax Board of Review, then the High Court17Source 17Attorney-General's Chambers, Income Tax Act 1947 (Singapore Statutes Online, current version), section 79(1), (3), (11) and (12). https://sso.agc.gov.sg/Act/ITA1947?ProvIds=pr79- (accessed 11 October 2026).18Source 18Attorney-General's Chambers, Income Tax Act 1947 (Singapore Statutes Online, current version), section 81(1), (2) and (5). https://sso.agc.gov.sg/Act/ITA1947?ProvIds=pr81- (accessed 11 October 2026). 2 months from service of the notice of assessment for a company15Source 15Attorney-General's Chambers, Income Tax Act 1947 (Singapore Statutes Online, current version), section 76(2), (2A), (3) and (4). https://sso.agc.gov.sg/Act/ITA1947?ProvIds=pr76- (accessed 11 October 2026).

Notes

United States. A formal written protest is required where the proposed change for any period is more than $25,000.1Source 1Internal Revenue Service, Publication 5, Your Appeal Rights and How to Prepare a Protest if You Disagree (Rev. 4-2021), pages 1 to 6. https://www.irs.gov/pub/irs-pdf/p5.pdf (accessed 11 October 2026). During the transition period that the IRS says runs through 10 January 2027, a deficient research credit refund claim can be perfected within 45 days.2Source 2Internal Revenue Service, Research credit claims (Section 41) on amended returns frequently asked questions, introduction and questions 7 and 15 (page last reviewed or updated 1 October 2026). https://www.irs.gov/businesses/corporations/research-credit-claims-section-41-on-amended-returns-frequently-asked-questions (accessed 11 October 2026). Suit in a District Court or the Court of Federal Claims is generally available only after the amount has been paid and a timely refund claim filed.1Source 1Internal Revenue Service, Publication 5, Your Appeal Rights and How to Prepare a Protest if You Disagree (Rev. 4-2021), pages 1 to 6. https://www.irs.gov/pub/irs-pdf/p5.pdf (accessed 11 October 2026).

United Kingdom. Claims treated as invalid for a missing claim notification or additional information form fail without a compliance check, and HMRC's guidance for those forms does not describe a separate challenge procedure.19Source 19HM Revenue and Customs, Tell HMRC you want to claim Research and Development (R&D) tax relief (last updated 31 October 2024), section "When to submit the form: claim notification period". https://www.gov.uk/guidance/tell-hmrc-that-youre-planning-to-claim-research-and-development-rd-tax-relief (accessed 11 October 2026).20Source 20HM Revenue and Customs, Additional information you must submit before you claim Research and Development tax relief (last updated 26 September 2025), section "When to submit". https://www.gov.uk/guidance/submit-detailed-information-before-you-claim-research-and-development-rd-tax-relief (accessed 11 October 2026). HMRC reported that 89 percent of the R&D compliance checks it settled in 2023 to 2024 were resolved by agreement.21Source 21HM Revenue and Customs, Approach to Research and Development tax reliefs 2023 to 2024 (published 30 October 2024), section 2.4, "Concluding the compliance check", "Compliance checks: facts and figures", "Dispute Resolution", "Maintaining standards" and Table 5, and section 2.5. https://www.gov.uk/government/publications/hmrcs-approach-to-research-and-development-tax-reliefs-2023-to-2024/approach-to-research-and-development-tax-reliefs-2023-to-2024 (accessed 11 October 2026). Alternative dispute resolution with an HMRC mediator is also available.22Source 22HM Revenue and Customs, Use alternative dispute resolution to settle a tax dispute (last updated 24 January 2024), sections "How alternative dispute resolution works", "What alternative dispute resolution can be used for", "When you can apply" and "How to apply". https://www.gov.uk/guidance/tax-disputes-alternative-dispute-resolution-adr (accessed 11 October 2026).

Ireland. No appeal lies against a company's own self-assessment.10Source 10Revenue Commissioners, Notes for Guidance, Taxes Consolidation Act 1997, Finance Act 2025 edition, Part 41A, sections 959AF and 959AG. https://www.revenue.ie/en/tax-professionals/documents/notes-for-guidance/tca/part41a.pdf (accessed 11 October 2026). The country page notes a question about whether the 30 day period applies to current accounting periods, and cites no published decision on the R&D credit.

Canada. The CRA states that an administrative review checks that legislation, policies and due process were followed and is not a second review of the claim.11Source 11Canada Revenue Agency, The SR&ED Review Process: A Guide for Claimants (April 20, 2026), Step 3 (3.1 The CRA's review findings, 3.2 Dispute resolution process, 3.3 Formal CRA objection process) and Appendix A. https://www.canada.ca/en/revenue-agency/services/scientific-research-experimental-development-tax-incentive-program/technical-review-a-guide-claimants.html (accessed 11 October 2026). A large corporation must pay 50 percent of the disputed amount when it objects.23Source 23Canada Revenue Agency, Resolving disputes, corporations: after you file your corporation income tax return. https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/corporations/after-you-file-your-corporation-income-tax-return/resolving-disputes.html (accessed 11 October 2026). The CRA states that an appeal from the Tax Court lies within 30 days of the final judgment, not counting July and August.14Source 14Canada Revenue Agency, P148, Resolving your dispute: Objection and appeal rights under the Income Tax Act (P148(E) Rev. 25), sections on the objection review, time limits, collection of disputed amounts, extensions and appeals. https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/p148/p148-resolving-your-dispute-objection-appeal-rights-under-income-tax-act.html (accessed 11 October 2026).

Singapore. IRAS describes a Technical Advisory Panel meeting as "solely for clarifications on R&D claims" and "not an arbitration session".24Source 24Inland Revenue Authority of Singapore, Research & Development (R&D) Tax Measures (last updated 13 August 2026), section "Technical Advisory Panel". https://www.iras.gov.sg/taxes/corporate-income-tax/income-deductions-for-companies/business-expenses/research-development-(r-d)-tax-measures (accessed 11 October 2026). An appeal to the High Court is available where the tax at stake exceeds $200.18Source 18Attorney-General's Chambers, Income Tax Act 1947 (Singapore Statutes Online, current version), section 81(1), (2) and (5). https://sso.agc.gov.sg/Act/ITA1947?ProvIds=pr81- (accessed 11 October 2026). The sources reviewed do not say whether refusal or recovery of an EIS cash payout can be challenged by objection and appeal.

Sources

  1. Internal Revenue Service, Publication 5, Your Appeal Rights and How to Prepare a Protest if You Disagree (Rev. 4-2021), pages 1 to 6. https://www.irs.gov/pub/irs-pdf/p5.pdf (accessed 11 October 2026).    Back
  2. Internal Revenue Service, Research credit claims (Section 41) on amended returns frequently asked questions, introduction and questions 7 and 15 (page last reviewed or updated 1 October 2026). https://www.irs.gov/businesses/corporations/research-credit-claims-section-41-on-amended-returns-frequently-asked-questions (accessed 11 October 2026).   Back
  3. Office of the Law Revision Counsel, 26 U.S.C. 6213, Restrictions applicable to deficiencies; petition to Tax Court, subsection (a), United States Code 2024 edition published by the Government Publishing Office. https://www.govinfo.gov/content/pkg/USCODE-2024-title26/html/USCODE-2024-title26-subtitleF-chap63-subchapB-sec6213.htm (accessed 11 October 2026).   Back
  4. Office of the Law Revision Counsel, 28 U.S.C. 1346, United States as defendant, subsection (a)(1), United States Code 2024 edition published by the Government Publishing Office. https://www.govinfo.gov/content/pkg/USCODE-2024-title28/html/USCODE-2024-title28-partIV-chap85-sec1346.htm (accessed 11 October 2026).  Back
  5. Office of the Law Revision Counsel, 26 U.S.C. 6532, Periods of limitation on suits, subsection (a)(1), (2) and (4), United States Code 2024 edition published by the Government Publishing Office. https://www.govinfo.gov/content/pkg/USCODE-2024-title26/html/USCODE-2024-title26-subtitleF-chap66-subchapD-sec6532.htm (accessed 11 October 2026).  Back
  6. GOV.UK, Disagree with a tax decision or penalty, sections 2 "Disagree with a tax decision", 3 "Disagree with a penalty", 4 "Get a review", 5 "Delay payment during appeals and reviews" and 6 "Reasonable excuses". https://www.gov.uk/tax-appeals/print (accessed 11 October 2026).   Back
  7. GOV.UK, Appeal to the tax tribunal, sections 1 "Overview" (including "Close an enquiry"), 2 "Appeal to the tribunal", 3 "If you have a hearing" and 4 "The tribunal's decision". https://www.gov.uk/tax-tribunal/print (accessed 11 October 2026).  Back
  8. Revenue Commissioners, Code of Practice for Revenue Compliance Interventions (effective 1 May 2022), sections 4.11, 4.11.1 and 4.11.2. https://www.revenue.ie/en/tax-professionals/documents/code-of-practice-revenue-compliance-interventions.pdf (accessed 11 October 2026).   Back
  9. Revenue Commissioners, Notes for Guidance, Taxes Consolidation Act 1997, Finance Act 2025 edition, Part 40A, sections 949I, 949O, 949V, 949Y, 949AO, 949AP and 949AQ. https://www.revenue.ie/en/tax-professionals/documents/notes-for-guidance/tca/part40a.pdf (accessed 11 October 2026).   Back
  10. Revenue Commissioners, Notes for Guidance, Taxes Consolidation Act 1997, Finance Act 2025 edition, Part 41A, sections 959AF and 959AG. https://www.revenue.ie/en/tax-professionals/documents/notes-for-guidance/tca/part41a.pdf (accessed 11 October 2026).   Back
  11. Canada Revenue Agency, The SR&ED Review Process: A Guide for Claimants (April 20, 2026), Step 3 (3.1 The CRA's review findings, 3.2 Dispute resolution process, 3.3 Formal CRA objection process) and Appendix A. https://www.canada.ca/en/revenue-agency/services/scientific-research-experimental-development-tax-incentive-program/technical-review-a-guide-claimants.html (accessed 11 October 2026).   Back
  12. Government of Canada, Income Tax Act, RSC 1985, c 1 (5th Supp), subsection 165(1). https://laws-lois.justice.gc.ca/eng/acts/I-3.3/section-165.html (accessed 11 October 2026).   Back
  13. Government of Canada, Income Tax Act, RSC 1985, c 1 (5th Supp), subsection 169(1). https://laws-lois.justice.gc.ca/eng/acts/I-3.3/section-169.html (accessed 11 October 2026).  Back
  14. Canada Revenue Agency, P148, Resolving your dispute: Objection and appeal rights under the Income Tax Act (P148(E) Rev. 25), sections on the objection review, time limits, collection of disputed amounts, extensions and appeals. https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/p148/p148-resolving-your-dispute-objection-appeal-rights-under-income-tax-act.html (accessed 11 October 2026).   Back
  15. Attorney-General's Chambers, Income Tax Act 1947 (Singapore Statutes Online, current version), section 76(2), (2A), (3) and (4). https://sso.agc.gov.sg/Act/ITA1947?ProvIds=pr76- (accessed 11 October 2026).   Back
  16. Inland Revenue Authority of Singapore, IRAS e-Tax Guide: Research and Development Tax Measures (Eighth Edition, published 30 January 2026), paragraphs 13.2 to 13.5 and 13.7. https://www.iras.gov.sg/docs/default-source/e-tax/research-and-development-tax-measures-etax-guide_6th-edition.pdf?sfvrsn=1f38a2e8_27 (accessed 11 October 2026).  Back
  17. Attorney-General's Chambers, Income Tax Act 1947 (Singapore Statutes Online, current version), section 79(1), (3), (11) and (12). https://sso.agc.gov.sg/Act/ITA1947?ProvIds=pr79- (accessed 11 October 2026).  Back
  18. Attorney-General's Chambers, Income Tax Act 1947 (Singapore Statutes Online, current version), section 81(1), (2) and (5). https://sso.agc.gov.sg/Act/ITA1947?ProvIds=pr81- (accessed 11 October 2026).   Back
  19. HM Revenue and Customs, Tell HMRC you want to claim Research and Development (R&D) tax relief (last updated 31 October 2024), section "When to submit the form: claim notification period". https://www.gov.uk/guidance/tell-hmrc-that-youre-planning-to-claim-research-and-development-rd-tax-relief (accessed 11 October 2026).  Back
  20. HM Revenue and Customs, Additional information you must submit before you claim Research and Development tax relief (last updated 26 September 2025), section "When to submit". https://www.gov.uk/guidance/submit-detailed-information-before-you-claim-research-and-development-rd-tax-relief (accessed 11 October 2026).  Back
  21. HM Revenue and Customs, Approach to Research and Development tax reliefs 2023 to 2024 (published 30 October 2024), section 2.4, "Concluding the compliance check", "Compliance checks: facts and figures", "Dispute Resolution", "Maintaining standards" and Table 5, and section 2.5. https://www.gov.uk/government/publications/hmrcs-approach-to-research-and-development-tax-reliefs-2023-to-2024/approach-to-research-and-development-tax-reliefs-2023-to-2024 (accessed 11 October 2026).  Back
  22. HM Revenue and Customs, Use alternative dispute resolution to settle a tax dispute (last updated 24 January 2024), sections "How alternative dispute resolution works", "What alternative dispute resolution can be used for", "When you can apply" and "How to apply". https://www.gov.uk/guidance/tax-disputes-alternative-dispute-resolution-adr (accessed 11 October 2026).  Back
  23. Canada Revenue Agency, Resolving disputes, corporations: after you file your corporation income tax return. https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/corporations/after-you-file-your-corporation-income-tax-return/resolving-disputes.html (accessed 11 October 2026).  Back
  24. Inland Revenue Authority of Singapore, Research & Development (R&D) Tax Measures (last updated 13 August 2026), section "Technical Advisory Panel". https://www.iras.gov.sg/taxes/corporate-income-tax/income-deductions-for-companies/business-expenses/research-development-(r-d)-tax-measures (accessed 11 October 2026).  Back