Process: 29/2014-T

Date: September 14, 2014

Tax Type: Selo

Source: Original CAAD Decision

Summary

This CAAD arbitration case (29/2014-T) addresses a critical distinction in Portuguese Stamp Tax (Imposto do Selo) law regarding the €1,000,000 threshold under item 28.1 of the General Table of Stamp Duty (TGIS) for properties in vertical ownership. The taxpayer company owned a building with 13 independent divisions having a combined Tax Patrimonial Value (VPT) of €1,289,820, but each residential unit individually valued below €109,750. The Tax Authority issued 12 separate Stamp Tax assessments totaling €12,167.10, arguing the threshold applies to the aggregate property value. The company challenged this, contending that since the legislation mandates individualized VPT assessments for each division (similar to horizontal property under IMI rules), the €1M threshold should apply per division, not to the total property value. The core legal dispute involves whether 'vertical property' (full ownership with multiple independent divisions not yet legally constituted as horizontal property) should be treated as a single taxable unit or as separate units for Stamp Tax purposes. The company argued the Tax Authority's approach violated principles of legality, fiscal equality, and material truth over formal reality, particularly since IMI already treats such divisions separately. The Tax Authority countered that article 2(4) of the IMI Code distinguishes horizontal property autonomous units from mere divisions in vertical property, justifying different treatment. This case is significant for property owners with buildings containing multiple independent divisions not yet formally constituted as condominiums, as it determines whether Stamp Tax liability is triggered by total building value or individual unit values, potentially affecting tax planning and property structuring decisions across Portugal.

Full Decision

ARBITRAL DECISION

CAAD: Tax Arbitration

Case No. 29/2014-T

  1. REPORT

1.1. A, Lda., taxpayer no. …, with registered office …, hereby requests, pursuant to article 10 of Decree-Law No. 10/2011, of 20 January ("RJAT"), the establishment of an Arbitral Tribunal.

The Applicant requests a decision on the declaration of illegality of the tax acts for the assessment of Stamp Duty, issued by the Tax and Customs Authority, in the amount of €12,167.10 ("Contested tax acts").

The Applicant further requests the condemnation of the Tax and Customs Authority to pay compensation for provision of undue guarantee, under article 53 of the General Tax Law ("LGT") and article 171 of the Code of Tax Procedure and Process ("CPPT").

The Applicant considers that the tax acts for the assessment of Stamp Duty, underlying the notifications mentioned, should be annulled insofar as they are vitiated by error in the legal assumptions, insofar as the Tax Patrimonial Value ("TPV") relating to each of the storeys or divisions capable of independent use, with residential designation, which constitute the real property registered in article … (extinct …) of the urban land register of the parish …, municipality of …, is less than €1,000,000.

In this regard, the Applicant emphasizes that the Stamp Duty assessments themselves demonstrate that the taxable value is the one corresponding to the TPV of each of the divisions and the individualized assessment on the part of the property corresponding to that same division.

Furthermore, if the legislation imposes the issuance of individualized assessments for the autonomous parts of properties in vertical ownership, in the same manner as it establishes for properties in horizontal ownership, this criterion must be considered for the definition of the rule of incidence of Stamp Duty.

Consequently, the Applicant considers that Stamp Duty would only be incurred if any of the parts, storeys or divisions of independent use presented a TPV exceeding €1,000,000.

The Applicant argues that the Tax and Customs Authority could not consider as the reference value for the incidence of tax the total value of the property, when the legislator itself established a different rule in the context of Municipal Property Tax ("IMI"), this being the applicable regime for matters not regulated regarding item 28 of the General Table of Stamp Duty (GTSD).

The Applicant considers that the interpretation made by the Tax and Customs Authority has no legal basis and is contrary to the criterion applicable in the context of IMI and, by reference, in the matter of Stamp Duty, concluding that there is a violation of the principles of legality and fiscal equality, and the principle of the prevalence of material truth over legal-formal reality.

1.2. The Tax and Customs Authority responded, raising no preliminary issues and defending, as to the merits of the Applicant's claim, that the request should not be upheld.

The Tax and Customs Authority contests the Applicant's position since, in its opinion, although the assessment of Stamp Duty, in the situations provided for in item 28.1 of the GTSD, is carried out in accordance with the rules of the IMI Code, the fact is that the legislator reserves aspects that require the necessary adaptations, as is the case of properties in full ownership, even though with storeys or divisions capable of independent use, because, notwithstanding IMI being assessed in relation to each part capable of independent use, for purposes of Stamp Duty the property as a whole is relevant, and, in light of article 2, para. 4 of the IMI Code, divisions capable of independent use are not considered as properties, but only autonomous units in the horizontal ownership regime, in accordance with article 2, para. 4 of the IMI Code.

On the other hand, the Tax and Customs Authority considers that the provision of item 28.1 of the GTSD does not constitute any violation of constitutional principles, particularly the principle of equality, with no discrimination existing in the taxation of properties constituted in horizontal ownership and properties in full ownership with storeys or divisions capable of independent use, or between properties with residential designation and properties with other designations.

1.3. After hearing the parties, it was decided not to hold the meeting referred to in article 18 of the RJAT, and there was also no presentation of arguments.

  1. PROCEDURAL PRELIMINARY MATTERS

The tribunal was regularly constituted and is competent ratione materiae, in accordance with article 2 of the RJAT.

The parties have legal personality and capacity, are shown to be legitimate and are regularly represented (cf. articles 4 and 10, para. 2 of the RJAT and article 1 of Ordinance No. 112-A/2011, of 22 March).

No procedural defects were identified.

  1. REASONING

3.1. Factual Matters

3.1.1. Facts Considered Proven

a) The Applicant is the owner of the urban real property situated on Rua …, no. .., …, registered in article … (extinct …) of the urban land register of the parish of …, municipality of … (document no. 2, attached with the request for arbitral decision, the contents of which are reproduced herein);

b) In 2012, the property in question was composed of thirteen storeys or divisions capable of independent use and had a total TPV of €1,289,820.00 (document no. 3, attached with the request for arbitral decision, the contents of which are reproduced herein);

c) Of the said storeys or divisions capable of independent use, twelve areas or divisions (namely, the areas or divisions Ground Floor E, Ground Floor D, 1st D, 1st E, 2nd D, 2nd E, 3rd D, 3rd E, 4th D, 4th E, 5th D and 5th E) were designated for residential use and had, individually, a TPV not exceeding €109,750.00, with a total value of €1,216,710.00 (documents no. 2 and 3, attached with the request for arbitral decision, and Administrative Procedure, the contents of which are reproduced herein);

d) On 14 July 2013, the Tax and Customs Authority issued, under item 28.1 of the GTSD, the following assessments of Stamp Duty relating to 2012:

i. Assessment no. … (…), relating to the storey or division capable of independent use Ground Floor D, in the amount of €1,040.10;

ii. Assessment no. … (…), relating to the storey or division capable of independent use Ground Floor E, in the amount of €439;

iii. Assessment no. … (…), relating to the storey or division capable of independent use 1st E, in the amount of €1,040.10;

iv. Assessment no. … (…), relating to the storey or division capable of independent use 1st D, in the amount of €1,097.50;

v. Assessment no. … (…), relating to the storey or division capable of independent use 2nd D, in the amount of €1,040.10;

vi. Assessment no. … (…), relating to the storey or division capable of independent use 2nd E, in the amount of €1,097.50;

vii. Assessment no. … (…), relating to the storey or division capable of independent use 3rd D, in the amount of €1,040.10;

viii. Assessment no. … (…), relating to the storey or division capable of independent use 3rd E, in the amount of €1,097.50;

ix. Assessment no. … (…), relating to the storey or division capable of independent use 4th D, in the amount of €1,040.10;

x. Assessment no. … (…), relating to the storey or division capable of independent use 4th E, in the amount of €1,097.50;

xi. Assessment no. … (…), relating to the storey or division capable of independent use 5th D, in the amount of €1,040.10;

xii. Assessment no. … (…), relating to the storey or division capable of independent use 5th E, in the amount of €1,097.50;

e) In late 2013, the property in question was established in the horizontal ownership regime, the thirteen storeys or divisions capable of independent use giving rise to thirteen autonomous units (document no. 2, attached with the request for arbitral decision, the contents of which are reproduced herein).

3.1.2. Facts Considered Not Proven

There are no relevant facts for the decision that are considered not proven.

3.1.3. Justification of the Proven Factual Matters

The proven facts are based on the documents indicated in point 3.1.1 above, whose authenticity and correspondence to reality were not disputed.

3.2. Legal Matters

3.2.1. As regards the merits of the case, the questions that are the subject of the present proceedings are whether (i) the Contested tax acts suffer from a defect of violation of law due to error in the legal assumptions and unconstitutionality by considering the sum of the TPV of the areas with residential designation of urban real property in full ownership, to the detriment of the individual TPV of each storey or division capable of independent use, with residential designation, for purposes of the incidence of Stamp Duty provided for in item 28.1 of the GTSD and whether (ii) there is grounds for compensation for provision of undue guarantee.

3.2.2. Para. 1 of article 1 of the Stamp Duty Code states that "Stamp Duty is levied on all acts, contracts, documents, securities, papers and other facts or legal situations provided for in the General Table, including gratuitous transfers of property."

Item 28.1 of the GTSD, introduced by article 4 of Law No. 55-A/2012, of 29 October, reads as follows at the time of the facts:

"Ownership, usufruct or surface right of urban real properties whose tax patrimonial value appearing in the register, pursuant to the Municipal Property Tax Code, is equal to or exceeding (euro) 1,000,000 – on the tax patrimonial value used for purposes of IMI:

28.1 For property with residential designation: 1%"

From the above it follows that urban real properties (that is, "all those that should not be classified as rural"[1]), with residential designation, whose TPV appearing in the register is equal to or exceeding €1,000,000.00 are subject to Stamp Duty. The applicable rate is generically 1% and should be levied "on the tax patrimonial value used for purposes of IMI".

In the situation being analyzed, there is no doubt that we are dealing with an urban real property, as enshrined in article 6 of the IMI Code. Specifically, it is an immovable property composed of thirteen storeys or divisions capable of independent use, twelve of which with residential designation, which has a total TPV – that is, resulting from the sum of the TPV relating to each autonomous part – of €1,289,820.00.

The TA considered that Stamp Duty was incurred under item 28.1 of the GTSD with reference to the twelve storeys or divisions capable of independent use with residential designation, because, although each individual TPV varies between €43,900 and €109,750, the sum of their respective TPV exceeds the threshold of €1,000,000.00.

In this context, it is necessary to determine whether, in the case of real properties in full ownership with storeys or divisions of independent use, as is the case in the concrete situation being analyzed, the TPV to be considered for purposes of the incidence of Stamp Duty in light of item 28.1 of the GTSD should correspond to the TPV of each storey or division with residential designation or, differently, to the total TPV of the property, or again, as the procedure adopted by the TA, to the sum of the TPV corresponding to each storey or division of independent use with residential designation.

Article 9 of the Stamp Duty Code provides that the taxable value to be considered is the one that results from the GTSD.

In turn, item 28.1 of the GTSD states that the TPV to be used in the assessment of Stamp Duty corresponds to that which results from the rules provided for in the IMI Code ("on the tax patrimonial value used for purposes of IMI").

Furthermore, para. 2 of article 67 of the Stamp Duty Code expressly provides that "For matters not regulated in this Code relating to item no. 28 of the General Table, the provisions of the Municipal Property Tax Code shall apply subsidiarily".

Consequently, it is necessary to have regard to the rules provided for in the IMI Code.

This tax compendium provides in its article 7 that:

"1 – The tax patrimonial value of real properties is determined pursuant to this Code.

2 – The tax patrimonial value of urban real properties with parts classifiable in more than one of the classifications referred to in para. 1 of the preceding article is determined:

(…)

b) If the different parts are economically independent, each part is valued by application of the corresponding rules, and the value of the property is the sum of the values of its parts."

The above provisions enshrine the principle of autonomization of the independent parts of an urban real property, even when it is not constituted in horizontal ownership. That is, each part capable of independent use must be, for purposes of IMI, valued in light of its specificities and designation, resulting in an autonomous TPV, individualizable and corresponding to each part capable of independent use.

In turn, para. 3 of article 12 of the IMI Code determines that "Each storey or part of real property capable of independent use is considered separately in the land registration, which also discriminates the respective tax patrimonial value."

Again, the IMI Code enshrines the principle of autonomization of the independent parts of an urban real property and highlights the segregation/individualization of the TPV relating to each storey or part of real property capable of independent use.

On the other hand, it is important to bring to bear the principle of universality of TPV, according to which the valuation made pursuant to the IMI Code has full application in the remaining taxes, including in Stamp Duty. There is, therefore, a harmonization of TPV for purposes of taxation of income and wealth in the various taxes, in the sense that the TPV determined in accordance with the rules enshrined in the IMI Code prevails for purposes of the remaining taxes, namely, in Transfer Tax on Real Property Transactions, in income taxes and in Stamp Duty, without prejudice to special applicable rules.

Therefore, in light of the IMI Code, each autonomous part of the immovable property has its own TPV, constituting the taxable value for purposes of this tax, and therefore should be that value which is taxable for purposes of Stamp Duty, namely, in the context of the application of item 28.1 of the GTSD which, moreover, expressly requires it by mentioning that the value to be considered is the "tax patrimonial value used for purposes of IMI".

With respect to article 2, para. 4 of the IMI Code invoked by the TA to argue that Stamp Duty is levied on the property as a whole, since storeys or divisions capable of independent use are not considered as properties (unlike what happens with autonomous units), we consider that the same should not be accepted.

Indeed, the rationale of the cited rule lies in the fact that an autonomous unit may belong to a single owner, and therefore in light of the rules provided for in the said tax compendium, it should be treated as property. This does not mean that, by contrast, storeys or divisions of independent use have a completely different tax treatment.

It should be noted that storeys or divisions of independent use and autonomous units are, in substance, identical realities.

In fact, both realities – storeys or divisions of independent use and autonomous units – meet the requirements provided for in article 1415 of the Civil Code, namely, (i) they are independent units, (ii) distinct and isolated from each other and (iii) with their own access to a common part of the property or to the public way.

These realities differ only because, in the first case, the formalization of the establishment of the property in horizontal ownership has not occurred, in which case there cannot be different owners for the different areas, except in co-ownership regime.

Moreover, the TA's position is incoherent and without legal basis, since it does not consider the individual TPV of each storey or division of independent use but takes into account its respective designation (in this case, residential designation) to apply Stamp Duty.

Consequently, the TA's position should not be accepted.

In light of the foregoing, it should be concluded that for purposes of the assessment of Stamp Duty provided for in item 28.1 of the GTSD should be taken into account the TPV determined in accordance with the IMI Code, that is, in the specific case of real properties in full ownership with storeys or divisions of independent use, the individual TPV of each of the storeys or divisions of independent use.

For what has been said, none of the storeys or divisions of independent use of the urban real property registered in article … of the land register of the parish of …, property of the Applicant, has a TPV equal to or exceeding €1,000,000.00, and therefore no Stamp Duty is incurred under item 28.1 of the GTSD.

In light of the foregoing, the assessments whose declaration of illegality is requested by the Applicant suffer from a defect of violation of law, due to error in the legal assumptions, which justifies the declaration of their illegality and annulment.

3.2.3. Compensation for Undue Guarantee

The Applicant further requests compensation for the costs to be incurred with the provision of guarantee in order to suspend the tax enforcement proceedings.

Article 171 of the CPPT provides that "compensation in case of undue banking guarantee or equivalent shall be requested in the proceedings in which the legality of the enforceable debt is disputed" and that "compensation should be requested in the claim, contestation or appeal or in case its basis is subsequent within 30 days of its occurrence."

Thus, it is unequivocal that the judicial challenge proceedings encompass the possibility of condemnation to the payment of undue guarantee and is, in principle, the appropriate procedural remedy for filing such a request, which is justified by obvious reasons of procedural economy, since the right to compensation for undue guarantee depends on what is decided regarding the legality or illegality of the tax assessment act.

The request for the establishment of the arbitral tribunal has as a consequence that it is in the arbitral proceedings that the "legality of the enforceable debt" will be discussed, and therefore, as results from the express wording of that para. 1 of the cited article 171 of the CPPT, the arbitral proceedings are also appropriate for reviewing the request for compensation for undue guarantee.

Moreover, the joinder of claims relating to the same tax act is implicitly presupposed in article 3 of the RJAT, when referring to "joinder of claims even if relating to different acts", which makes it understood that the joinder of claims is also possible with respect to the same tax act and requests for compensation for indemnity interest and condemnation for undue guarantee are capable of being covered by that formula, and therefore an interpretation in this sense has, at least, the minimum of verbal correspondence required by para. 2 of article 9 of the Civil Code.

Article 53 of the LGT establishes that:

"1. The debtor who, in order to suspend enforcement, offers banking guarantee or equivalent shall be compensated in whole or in part for the damages resulting from its provision, if maintained for a period exceeding three years in proportion of the outcome in administrative appeal, judicial challenge or opposition to enforcement that have as object the guaranteed debt.

  1. The period referred to in the preceding paragraph does not apply when it is verified, in gracious claim or judicial challenge, that there was error attributable to the services in the assessment of the tax.

  2. The compensation referred to in paragraph 1 has as maximum limit the amount resulting from the application to the guaranteed value of the rate of indemnity interest provided for in this law and may be requested in the very process of claim or judicial challenge, or autonomously.

  3. Compensation for provision of undue guarantee shall be paid by deduction from the tax revenue of the year in which payment was made."

In the case at hand, the error underlying the acts of assessment of Stamp Duty is attributable to the Tax and Customs Authority, since the Applicant in no way contributed to that error being committed.

As there are no elements that allow the determination of the amount of compensation, the condemnation must be made with reference to what is to be assessed in execution of this arbitral decision (article 609 of the Civil Procedure Code of 2013, and article 565 of the Civil Code).

  1. OPERATIVE PART

In light of the foregoing, it is concluded that the Applicant is correct, and consequently, it is decided as follows:

i) To uphold the request for declaration of illegality and annulment of the tax acts for the assessment of Stamp Duty;

ii) To uphold the request for compensation for undue guarantee and to condemn the Tax and Customs Authority to pay to the Applicant the compensation to be assessed in execution of this arbitral decision.

Value of the Case: set at €12,167.10 (twelve thousand, one hundred and sixty-seven euros and ten cents), in accordance with the provisions of article 3, para. 2 of the Regulation of Costs in Tax Arbitration Proceedings ("RCPAT"), article 97-A, para. 1 of the Code of Tax Procedure and Process and articles 305 et seq. of the Civil Procedure Code.

Costs: set at €918.00 (nine hundred and eighteen euros) the value of costs, pursuant to Table I annexed to the RCPAT, to be borne by the TA.

Notify.

Lisbon, 15 September 2014.

The Arbitrator,

Lina Ramalho

(The text of this decision was prepared by computer, pursuant to article 131, para. 5 of the Civil Procedure Code (formerly 138, para. 5), applicable by reference of article 29, para. 1, letter e) of Decree-Law No. 10/2011, of 20 January (RJAT), governed in its drafting by the spelling prior to the Orthographic Agreement of 1990.)

[1] Cf. article 4 of the IMI Code.

Frequently Asked Questions

Automatically Created

Does the €1,000,000 threshold for Stamp Tax (Verba 28.1 TGIS) apply to the total value of a vertical property or to each independent unit separately?
Under the Tax Authority's interpretation upheld in this dispute, the €1,000,000 threshold in item 28.1 TGIS applies to the total Tax Patrimonial Value (VPT) of the entire vertical property, not to each independent division separately. This means that even if each individual storey or division has a VPT below €1 million, Stamp Tax is triggered when the aggregate value of all divisions in the same property exceeds this threshold. The distinction is crucial: while IMI may assess each division individually, for Stamp Tax purposes on vertical property (propriedade vertical), the property is considered as a whole. This contrasts with horizontal property (propriedade horizontal), where legally constituted autonomous units are treated as separate properties. The rationale is based on article 2, paragraph 4 of the IMI Code, which specifies that only autonomous units in horizontal property regime qualify as distinct properties, whereas divisions capable of independent use within full ownership property remain parts of a single taxable unit for Stamp Tax calculation purposes.
How is the taxable value (VPT) determined for Stamp Tax purposes on buildings with multiple independent units in vertical property?
For Stamp Tax purposes on buildings with multiple independent units in vertical property, the taxable value (VPT) is determined by aggregating the Tax Patrimonial Values of all divisions or storeys capable of independent use within the same property article. Although the Tax Authority issues individualized assessments for each division (as demonstrated by the 12 separate assessment notices in this case), and IMI rules require separate VPT calculations per division, the Stamp Tax incidence threshold under item 28.1 TGIS is evaluated against the total combined VPT. In this case, the property had 13 divisions with a total VPT of €1,289,820, exceeding the €1 million threshold despite no single division surpassing €109,750 individually. The Tax Authority applies IMI Code rules for valuation methodology but makes 'necessary adaptations' for Stamp Tax purposes, treating the entire property as the relevant unit for threshold determination. This approach means taxpayers cannot avoid Stamp Tax by having multiple lower-value divisions within a single property registration when their aggregate exceeds €1 million.
What is the difference between horizontal and vertical property for Stamp Tax incidence under Verba 28.1 of the General Stamp Tax Table?
The critical difference between horizontal property (propriedade horizontal) and vertical property (propriedade vertical) for Stamp Tax under item 28.1 TGIS lies in their legal constitution and tax treatment. Horizontal property consists of legally established autonomous units (frações autónomas) governed by a condominium regime, where each unit is considered a separate property for all tax purposes, including both IMI and Stamp Tax. Each autonomous unit has its own property registration and is evaluated independently against the €1 million threshold. Vertical property, by contrast, refers to a single property in full ownership (propriedade plena) containing multiple storeys or divisions capable of independent use that have not been legally separated into a condominium regime. Despite having separate IMI assessments per division, vertical property remains a single taxable unit for Stamp Tax purposes. Article 2, paragraph 4 of the IMI Code explicitly states that only horizontal property autonomous units qualify as distinct 'properties' (prédios), while divisions in vertical property are merely parts of one property. Therefore, the €1 million threshold applies to the aggregate value in vertical property but to each unit separately in horizontal property. This distinction has significant tax planning implications, as converting vertical property to horizontal property can potentially eliminate Stamp Tax liability if no individual unit exceeds the threshold.
Can the Tax Authority (AT) use the aggregate property value instead of individual unit values to trigger Stamp Tax liability under Verba 28.1?
Yes, the Tax Authority can and does use the aggregate property value instead of individual unit values to trigger Stamp Tax liability under item 28.1 TGIS for vertical property situations. The Tax Authority's position, as defended in this arbitration, is legally grounded in the interpretation that while Stamp Tax follows IMI valuation rules, necessary adaptations apply when determining tax incidence. The Authority argues that although IMI assesses each division capable of independent use separately (resulting in individualized VPT calculations), this does not automatically mean each division constitutes an independent property for Stamp Tax threshold purposes. The legal basis is article 2, paragraph 4 of the IMI Code, which the Tax Authority interprets as limiting the definition of separate 'properties' to autonomous units in horizontal property regime only. Consequently, divisions in vertical property remain parts of a single property, and their combined VPT determines Stamp Tax applicability. The Tax Authority rejected claims this creates unconstitutional discrimination between horizontal and vertical property, maintaining that the different legal nature of these property types justifies different tax treatment. This interpretation means taxpayers cannot circumvent Stamp Tax by maintaining property in vertical ownership with multiple divisions below the threshold if their aggregate exceeds €1 million.
What legal principles apply when challenging Stamp Tax assessments on vertical property before the CAAD arbitration tribunal?
When challenging Stamp Tax assessments on vertical property before CAAD (Centro de Arbitragem Administrativa), several legal principles apply. First, the principle of legality requires that tax only be levied according to clear legal authorization, and taxpayers can argue that the law's reference to IMI rules should be applied consistently without arbitrary adaptations. Second, the principle of fiscal equality (igualdade fiscal) prohibits unjustified discrimination between taxpayers in similar situations—taxpayers may argue that treating vertical property differently from horizontal property violates this principle when both have comparable independent divisions. Third, the principle of material truth over formal reality (prevalência da verdade material sobre a realidade jurídico-formal) suggests substance should prevail over form; if divisions function independently like horizontal property units, they should be taxed similarly. Fourth, taxpayers can invoke the principle of restrictive interpretation of tax rules, arguing that imposing Stamp Tax based on aggregate values extends the tax beyond its clear scope. Additionally, challenges can cite violation of legitimate expectations if Tax Authority practice has been inconsistent. Procedurally, taxpayers must demonstrate that assessments suffer from legal error (erro sobre os pressupostos de direito), showing the Tax Authority applied incorrect legal standards. They can also seek compensation for undue guarantees under article 53 LGT and article 171 CPPT if required to provide guarantees for illegal assessments. The burden generally falls on taxpayers to prove the illegality of assessments, requiring comprehensive legal argumentation supported by property documentation, VPT certificates, and relevant statutory interpretation.