Residential Zoned Land Tax Requires Existing Public Services at the Statutory Assessment Date

1. Introduction

This judgment establishes important limits on the inclusion of residential development land within the Residential Zoned Land Tax (“RZLT”). Its central holding is that the statutory servicing requirements must be satisfied by reference to existing public infrastructure, with adequate capacity, at the date prescribed by the legislation. Infrastructure expected to become available later, or privately constructed by the developer to overcome deficiencies in public provision, cannot substitute for those requirements.

The proceedings concerned approximately 24.5 hectares of residentially zoned land in Portmarnock, County Dublin. The applicants challenged two decisions of An Coimisiún Pleanála affirming Fingal County Council’s inclusion of their land within the RZLT mapping system. Residential zoning was undisputed. The controversy concerned whether the land had the necessary access to wastewater services and when, if ever, it first satisfied the statutory criteria.

The decision also addresses a significant procedural question: whether an authority’s concession that its decisions should be quashed makes judicial review proceedings moot when fundamental disagreements about the law would remain relevant on reconsideration. Stack J. held that these proceedings remained live and resolved the disputed statutory interpretation issues.

2. Statutory and Factual Background

The tax and its mapping system

RZLT was introduced by the Finance Act, 2021, which inserted Part 22A into the Taxes Consolidation Act, 1997 (“TCA”). Its purpose is to encourage housing development on land that is both appropriately zoned and serviced, rather than permit such land to remain undeveloped. The annual charge is 3% of the land’s market value, making both inclusion and the date of first qualification financially consequential.

Section 653B(b) requires land which:

“it is reasonable to consider may have access, or be connected, to public infrastructure and facilities” necessary for residential development, “with sufficient service capacity available for such development”.

Local authorities identify qualifying land through maps, subject to submissions and appeals to the respondent. The Revenue Commissioners administer the tax but do not decide the mapping questions. Consequently, the court rejected the suggestion that Revenue was a necessary party to these challenges.

The Finance (No. 2) Act, 2023 deferred the first charge to 2025 and removed the initial final maps from the definition triggering liability. It did not erase the initial mapping exercise. Earlier determinations remained matters to be considered when preparing revised maps, but they did not conclusively establish the land’s status under the amended legislation.

The same legislation introduced section 653B(iia), excluding land where development would conflict with specified statutory phasing objectives. That amendment was potentially important because the South Portmarnock Local Area Plan, which remained effective until 6 July 2023, imposed development restrictions linked to the provision of drainage infrastructure.

The wastewater deficiency

The disputed land comprised development phases 1D, 1E and 1F. Earlier phases elsewhere in the applicants’ landholding had already been developed. Their history explained why later development depended on infrastructure supplied by the applicants rather than an adequate permanent public network.

• Phases 1D and 1E: Development depended on upgrading a temporary pumping station to an interim pumping station at the applicants’ expense. The interim station cost more than €2.276 million and would ultimately require decommissioning when permanent public infrastructure became available.
• Phase 1F: The interim station lacked sufficient capacity. Development required either the permanent public pumping station or a developer-funded rising main approximately 1.7 kilometres long, costing more than €995,000 and involving third-party land.
• Permanent public provision: Uisce Éireann’s proposed Portmarnock Bridge Pumping Station received permission on appeal on 27 June 2024. That permission was challenged, and the proceedings were not resolved until March 2026. Construction had not commenced by the substantive hearing in July 2026.

The challenged decisions were made on 1 October 2024 and 20 November 2025. The respondent subsequently conceded that both should be quashed because they wrongly proceeded on the basis that the permanent pumping station works could be undertaken entirely on public land without third-party consents. It did not concede the applicants’ broader legal arguments.

3. Summary of the Judgment

The court found multiple material errors in the respondent’s interpretation and application of Part 22A:

1. The proceedings were not moot. Unresolved legal questions would govern any fresh decisions on the applicants’ appeals.
2. The statutory assessment dates were binding. The respondent had to assess conditions on 1 January 2024 and 1 January 2025 respectively, rather than rely on subsequent changes.
3. Future infrastructure was insufficient. Planning permission or an expectation of later service provision did not establish existing servicing.
4. Developer-led infrastructure did not satisfy the public-infrastructure requirement. The applicants’ obligation to construct essential infrastructure went beyond connecting to an existing public service.
5. Capacity had to exist throughout the relevant system. Spare treatment capacity at Ringsend did not establish adequate capacity in the local drainage network and pumping stations.
6. The first qualifying date required fresh consideration. The respondent could not simply preserve 1 January 2022 without examining the amended legislation and the applicants’ objections.
7. “Reasonable to consider” required objective evidence. It did not confer a planning discretion insulated from scrutiny of the correct statutory test.

The applicants did not succeed on their separate contention that communications had unfairly led them to believe that liability could first arise only in 2027. The court also declined to determine a fact-specific complaint about the failure to distinguish between the different development phases.

The judgment established that the decisions were legally defective and that certiorari was appropriate. However, the precise final orders, including remittal, declarations and the operation of section 653AE, were reserved for further submissions.

4. Analysis of the Legal Reasoning

A. A concession of quashing did not remove the live controversy

The respondent’s mootness argument treated the availability of certiorari as effectively exhausting the proceedings. The court rejected that approach because the concession left the legal framework for reconsideration almost entirely disputed.

The respondent still maintained that future infrastructure and developer-led infrastructure could be considered. It also disputed whether the applicants’ appeal required reconsideration of the first qualifying date. If the court had declined to address those questions, the appeals could have returned to the respondent to be determined using the very interpretations challenged in the proceedings.

The distinction was between a dispute that had genuinely ended and an administrative decision that would be remade under a contested legal test. Here, the statutory interpretation questions continued to affect the applicants’ potential liabilities for two tax years.

Alternatively, the court would have exercised its discretion to decide the issues even if the proceedings were technically moot. The applicants had pursued repeated challenges over several years without obtaining judicial resolution of the central legal questions. The confused operation of the mapping process, substantial financial exposure and procedural history strongly favoured adjudication.

This reasoning was not unlimited. The complaint that an inspector had inadequately differentiated the development phases was treated as moot because it concerned a particular factual assessment that need not recur. The surviving issues concerned legal rules necessarily or potentially governing fresh decisions.

B. Two distinct dates must not be confused

The judgment distinguishes:

• The annual assessment date: whether land satisfied the criteria at the relevant annual snapshot.
• The first qualifying date: when the land initially satisfied those criteria, which determines when charging begins under section 653Q.

A map showing land “in scope” as of 1 January 2024 did not mean that the land first qualified on that date. It could have qualified earlier and remained within scope. Where no later date was specified, the statutory effect was to indicate qualification from 1 January 2022.

Under section 653Q, land satisfying the criteria on 1 January 2022 first became chargeable in 2025. For land first satisfying the criteria after that date, charging begins with the third year following the year of qualification. Accordingly, failing to identify the correct initial date could accelerate liability substantially.

C. The annual snapshot excludes subsequent changes, not necessarily subsequent evidence

The statutory timetable required the first revised-map assessment to address conditions on 1 January 2024. The respondent instead considered matters including the June 2024 grant of permission for the permanent pumping station and later works associated with the interim station.

The court’s interpretation followed both the legislation’s fixed dates and procedural fairness. Landowners must make submissions within prescribed periods. It would be unfair to invite submissions about conditions at one date and then decide the matter by reference to later developments.

A useful qualification appears in the discussion of the August 2025 Wastewater Treatment Capacity Register. A later document could be relevant if it established capacity existing on 1 January 2025. Its later publication would not itself make it inadmissible. The difficulty was reliance on later conditions without demonstrating that they existed at the statutory date.

D. Future availability is not present servicing

The phrase “may have access” could, in isolation, suggest anticipated future access. Read within Part 22A, however, it could not support taxation based on infrastructure expected to arrive at an unspecified later date.

The elaborate annual mapping process assesses whether criteria are satisfied at particular times. Allowing projected infrastructure within the lifetime of a development plan to suffice would undermine both the fixed dates and the purpose of annual revision.

Tax certainty reinforced that conclusion. Liability at 3% of market value could not fairly rest on uncertain assumptions about when a permitted project would be constructed. Permission establishes legal authorisation to undertake development; it does not establish that operational infrastructure exists.

E. “Public” infrastructure excludes the developer-led substitute relied upon here

The court gave substantive effect to the word “public”. Infrastructure constructed by the developer to comply with planning permission could not be counted as satisfying section 653B(b), whether associated with earlier development or proposed future compliance.

The interim pumping station was therefore not sufficient merely because it enabled development or communicated with Uisce Éireann’s telemetry system. It remained a privately constructed, temporary solution pending permanent public provision.

This was the central distinction between connecting to adequate public infrastructure and having to create essential infrastructure because that provision was absent. The latter could not be used to establish that the land already met the statutory servicing test.

F. Access requires a legally supportable connection

Actual physical connection was not invariably necessary. Land could qualify where it enjoyed a right to connect to appropriate existing public infrastructure. However, physical proximity alone was not conclusive where the route depended on private land or privately owned conduits.

In those circumstances, an easement, wayleave or other legal entitlement might be needed. Previous common ownership could not simply establish continuing access rights: neighbouring land might have been transferred to a management company, for example.

The court did not need to formulate a comprehensive distinction between “minor” and “extraordinary” works. The decisive defects were reliance on developer-led infrastructure and the absence of adequate existing public provision. It concluded that anything beyond straightforward connection works to existing public infrastructure fell outside the statutory criteria.

G. Capacity must be assessed across the whole wastewater system

Section 653B(b) requires both access or connection and sufficient service capacity. These are cumulative requirements.

The inspectors relied on treatment capacity at Ringsend and guidance suggesting that a need for network upgrades did not exclude land where treatment capacity existed. The court held that this guidance conflicted with the statute. Capacity at the treatment destination was insufficient if the drainage network and pumping stations could not convey wastewater there.

The statutory inquiry is therefore functional and system-wide: can the infrastructure necessary for residential development actually serve that development?

H. Earlier mapping decisions were relevant but not conclusive

The 2023 amendments required fresh consideration of the first qualifying date when the initial revised map was prepared. The newly introduced phasing exclusion made that especially important.

The respondent could not treat the earlier determination as dispositive or ignore section 653B(iia) because the local area plan had expired by the date of the later decision. The relevant question included whether the earlier phasing restrictions prevented qualification during the period for which the map purported to establish liability.

Nor was a separate, narrowly framed appeal against the date essential. An argument that land had never qualified necessarily challenged every proposed qualifying date. As the court explained, the greater objection included the lesser.

I. Objective evidence, not an unrestricted planning discretion

The respondent argued that “it is reasonable to consider” created a discretionary assessment reviewable only under the restrictive irrationality standard associated with planning decisions.

The court rejected that characterisation. Section 653B(b) establishes conditions for a substantial tax charge. The phrase requires an objective evidential basis for concluding that services were available; it does not permit a discretionary choice to impose liability despite unmet statutory conditions.

This does not transform judicial review into a general rehearing of every factual servicing dispute. It establishes that the legal criteria governing those factual assessments are questions for the court.

5. Precedents Cited and Their Influence

Mootness and continuing practical consequences

Lofinmakin v. Minister for Justice [2013] IESC 49, [2014] 4 I.R. 274

The challenge concerned refusal to revoke a deportation order, but the order was subsequently revoked. Litigation about the revocation process could then yield no practical benefit. Stack J. distinguished that completed controversy from the present outstanding appeals. The case also supplied the alternative principle that overriding concerns of justice may justify deciding an otherwise moot case.

M.A. v. Minister for Justice (ex tempore, 17 December, 2009) and P.O. v. Minister for Justice and Equality [2015] IESC 5, [2015] 3 I.R. 164

These authorities explained the narrower obligations applicable to deciding whether to revoke an existing deportation order, compared with making one initially. Their role was to clarify why any future decision in Lofinmakin v. Minister for Justice would engage a different legal framework. Here, reconsideration would engage the same disputed RZLT provisions.

O'Brien v. Personal Injuries Assessment Board (No. 2) [2006] IESC 62, [2007] 1 I.R. 328

The question concerned correspondence through a solicitor, but the claim had moved beyond the Board into court proceedings. The Board’s involvement had ended. That contrasted with the respondent’s continuing responsibility to determine the applicants’ tax-mapping appeals.

Right to Know CLG v. Commissioner for Environmental Information [2020] IEHC 392, [2023] 1 I.R. 793

The requested documents had been supplied, and remittal was conceded to be unnecessary. Although the legal classification remained disputed, no further administrative decision was needed. Stack J. distinguished the present situation, where remittal was sought and the disputed interpretation would affect the fresh decisions.

O'Flynn Construction Limited v. An Bord Pleanála [2024] IEHC 362

This was the closest RZLT authority. Barr J. had found a challenge concerning the initial final map moot after legislative changes removed that map’s direct tax consequences. The present decisions concerned revised maps capable of producing actual liabilities for 2025 and 2026. The judgment therefore distinguishes, rather than rejects, the earlier ruling.

Goold v. Collins [2004] IESC 38 and Borowski v. Canada (Attorney General) [1989] 1 S.C.R. 342

These supplied the general test: a controversy remains live where its resolution affects or potentially affects the parties’ rights. The outstanding interpretation questions met that test because they would govern reconsideration of the appeals. The judgment also considered concerns about decisions evading review, while recognising that these tax decisions did not simply expire with time.

Judicial supervision and conceded relief

Ballyboden TTG v. ABP [2024] IESC 4

This authority supported the proposition that a concession does not dispense with the court’s supervisory responsibility. Judicial review remedies are discretionary, and the court must satisfy itself that certiorari is appropriate rather than merely record the parties’ agreement.

Interpretation of taxation legislation

Bookfinders Limited v. Revenue Commissioners [2020] IESC 60

The Supreme Court’s treatment of tax interpretation supported reading the charging conditions through ordinary language, statutory context and the legislative scheme, rather than treating section 653B(b) as a free-standing planning power.

Perrigo Pharma International DAC v. McNamara [2020] IEHC 552

McDonald J.’s synthesis supplied the judgment’s principal interpretive framework: ordinary meaning, context, purpose where appropriate, and meaningful effect for each statutory word. Importantly, ambiguity must not create fresh tax liability unfairly through imprecise language. Those principles supported the insistence on existing public services and rejection of uncertain future provision.

Dunnes Stores v. Revenue Commissioners [2019] IESC 50

Cited within the principles reproduced from Perrigo Pharma International DAC v. McNamara, this authority emphasised the importance of context. The court accordingly interpreted “may have access” alongside the fixed assessment dates and annual mapping provisions, rather than as an independent permission to speculate about future infrastructure.

The rejected planning-discretion analogy

O'Keeffe v. An Bord Pleanála [1993] 1 I.R. 39

The respondent invoked the restrictive standard associated with review of planning judgments. The court rejected its use to shield an incorrect interpretation of statutory tax conditions. The issue was the legal meaning of the charging criteria, not merely the reasonableness of a planning assessment within a lawful discretion.

Related litigation forming part of the facts

Joyce-Kemper v. An Bord Pleanála H.JR. 2024.0001079

This proceeding concerned the challenge to permission for the permanent pumping station. It was relevant as factual context, not as a source of legal principle: its duration reinforced the uncertainty of future public provision and the absence of operational infrastructure at the assessment dates.

6. Fair Procedures and the Limits of the Applicants’ Success

The applicants argued that communications about the revised mapping exercise led them to understand that their land could first qualify only on 1 January 2024, with tax becoming payable in 2027. The court rejected that interpretation.

Although the respondent’s solicitors had overstated the legal irrelevance of the initial final map, their letter expressly referred to liability beginning in 2025. The Council’s notice did likewise. The misunderstanding arose from the complexity of the legislation, not a demonstrated procedural unfairness in those communications.

This conclusion is consistent with the court’s separate reliance on fairness when fixing the annual assessment date. One issue concerned the lawful temporal basis of decision-making; the other concerned whether particular communications misleadingly represented the first possible charging year.

7. Relief and Questions Left Open

The judgment did not finally determine the administrative status of the land or every consequence for the applicants’ tax liabilities.

Order 84, rule 27(4) permits the court, after quashing a decision, to remit the matter for reconsideration in accordance with its findings. The court reserved the precise orders, including whether specific declarations were needed alongside certiorari and any remittal.

The applicants also relied on section 653AE in opposing remittal. Stack J. expressed significant preliminary doubts that the provision displaced the ordinary supervisory character of judicial review or authorised the court to take over the respondent’s decision-making function. However, its application and operation were expressly left for further submissions.

The court considered it highly likely that application of its findings would result in the land being found outside scope at the material times. That observation was not itself a final substitute mapping decision. Nor did the judgment finally resolve the practical amendment of the maps or the applicants’ position before Revenue.

8. Potential Impact

More disciplined servicing assessments

Local authorities and the respondent must identify the relevant date, establish the services then available, examine legal connection rights and assess capacity throughout the necessary network. A planning permission or feasibility confirmation subject to substantial upgrades cannot answer those questions by itself.

Limits on administrative guidance

The judgment identifies statutory defects in reliance on guidance allowing future servicing or treating treatment capacity as sufficient despite network deficiencies. Guidance may assist administration, but it cannot enlarge the statutory tax base. Decisions founded on those propositions may require reconsideration, depending on their facts and procedural position.

Protection against taxing infrastructure deficits

The ruling draws a clear boundary between encouraging development of serviced land and taxing land whose development depends on the owner remedying missing public infrastructure. Its practical importance is especially pronounced for large sites requiring pumping stations or substantial off-site wastewater works.

No automatic exemption for every connection requirement

The decision does not establish that land must already be physically connected or that every outstanding connection work defeats liability. Straightforward connection to adequate existing public infrastructure remains distinct from construction of the essential service itself.

Continuing disputes after concessions

The mootness analysis is relevant beyond taxation. A narrow concession of unlawfulness will not necessarily end judicial consideration where unresolved legal questions would govern the same outstanding application on remittal. Equally, the court’s treatment of the phase-specific complaint shows that purely historical factual criticisms may no longer require adjudication.

9. Complex Concepts Simplified

“In scope”

Land meets the statutory conditions for inclusion in the RZLT system. Residential zoning alone is insufficient.

Certiorari

A court order quashing an unlawful decision. It does not ordinarily replace that decision with the court’s own assessment.

Remittal

Sending the matter back to the responsible authority for a fresh decision applying the court’s legal findings.

Mootness

A case no longer presents a dispute whose resolution can affect the parties’ rights. Outstanding consequences on reconsideration may keep a dispute live.

Easement or wayleave

A legal entitlement permitting use of another person’s land, potentially including laying or accessing service pipes.

Network capacity and treatment capacity

The ability to transport wastewater and the ability to process it are separate requirements. Adequate treatment cannot compensate for an inadequate route to the plant.

10. Conclusion

This judgment confines RZLT to its statutory servicing conditions: adequate public infrastructure must exist at the prescribed date, and the land must be connected or enjoy a legally supportable right to connect. Future public projects, developer-created substitutes and treatment capacity unsupported by adequate network capacity do not satisfy that test.

Its broader significance is the insistence that substantial tax liabilities rest on clear statutory conditions and objective evidence—not projections or administrative discretion. The court resolved those governing principles while reserving the precise remedial orders and related tax-enforcement questions.