DYKMAN, J.
The estate of Dorothy McManus appeals from a circuit court order affirming a decision of the Tax Appeals Commission in a ch. 227, Stats., review and declaring constitutional the Farmland Preservation Credit statute, sec. 71.09(11), Stats. (1977-78).1 The Commission had sustained a Department of Revenue decision, denying Dorothy McManus a tax credit under the statute. The issues are whether sec. 71.09(11) is a tax provision; and if so, whether it violates the uniformity of taxation clause, art. VIII, sec. 1 of the Wisconsin Constitution2 We conclude sec. 71.09(11) is not a tax statute. Accordingly, we affirm without reaching the constitutional issue.
BACKGROUND
The parties stipulated to the facts. In 1978, Dorothy and Jack McManus owned 331.3 acres of farmland as joint tenants. That year the McManuses had $180,987 in [453]*453household income. Dorothy's income was approximately $6,000.
Dorothy applied for a farmland preservation credit of $1,836.80 based on her interest in the land.3 The Department of Revenue denied her claim because her household income exceeded $38,429, the maximum allowed under the statute. The Tax Appeals Commission upheld the determination on the same ground.
In a ch. 227, Stats., review, the circuit court affirmed the commission's decision, finding that sec. 71.09(11), Stats., limited eligibility for the tax credit by the amount of the claimant's household income. The court also declared that the statute was constitutional after rejecting due process, equal protection and uniformity of taxation claims. On appeal, the estate maintains only its uniformity of taxation challenge to sec. 71.09(11) under Wis. Const. art. VIII, sec. 1.
STANDARD OF REVIEW
Whether sec. 71.09(11), Stats., is a tax statute and whether the statute contravenes the uniformity clause are both questions of law. We generally accord deference to the Tax Appeal Commission's legal conclusions, although we are not bound by those conclusions. Revenue Dept. v. Lake Wisconsin Country Club, 123 Wis. 2d 239, 242-43, 365 N.W.2d 916, 918 (Ct. App. 1985). But see Drivers Local No. 695 v. LIRC, 154 Wis. 2d 75, 82-83, 452 N.W.2d 368, 371-72 (1990) (agency's interpretation of statute not entitled to weight unless long continued, substantially uniform and without judicial [454]*454challenge); contra Samens v. LIRC, 117 Wis. 2d 646, 673-74, 345 N.W.2d 432, 444 (1984) (agency's interpretation of statute entitled to weight where question one of first impression).
Here, the Tax Appeals Commission did not consider the constitutional question because it lacked the authority to do so. See Wisconsin Socialist Workers 1976 Campaign Committee v. McCann, 433 F. Supp. 540, 545 (E.D. Wis. 1977) (Administrative agencies have no authority to rule on the constitutionality of statutes they enforce.). The trial court reached the constitutional question. We decide such issues without deference to the trial court. O'Donnell v. Reivitz, 144 Wis. 2d 717, 725, 424 N.W.2d 733, 735 (Ct. App. 1988).
The unconstitutionality of any statute must be established beyond a reasonable doubt, and every presumption must be indulged to sustain the law if at all possible. Quinn v. Town of Dodgeville, 122 Wis. 2d 570, 577, 364 N.W.2d 149, 154 (1985). "[WJhere a tax measure is involved, the presumption of constitutionality is strongest." Department of Revenue v. Moebius Printing Co., 89 Wis. 2d 610, 625, 279 N.W.2d 213, 219 (1979).
DISCUSSION
We must first determine whether sec. 71.09(11), Stats., is a property tax statute. The rule that taxation shall be uniform applies to the taxation of property, not income. Gottlieb v. Milwaukee, 33 Wis. 2d 408, 427-28, 147 N.W.2d 633, 643 (1967). A 1974 amendment to Wis. Const. art. VIII, sec. 1 excepted agricultural land from the uniformity requirement. Under the amendment, agricultural land may be taxed in a manner that is not [455]*455uniform with the taxation of other real property. However, the uniformity requirement still applies within the agricultural classification itself. 68 Op. Att'y Gen. 179, 181 (1979). Thus, a tax law that granted a partial exemption to some agricultural lands and not others would violate the uniformity requirement. State ex rel. La Follette v. Torphy, 85 Wis. 2d 94, 106, 270 N.W.2d 187, 192 (1978).
The estate maintains that sec. 71.09(11), Stats., is a tax statute and that its effect is to partially exempt some farmland from full taxation. The department, on the other hand, argues that the statute is a relief statute and that consequently the uniformity provision does not apply.
In State ex rel. Harvey v. Morgan, 30 Wis. 2d 1, 10-14, 139 N.W.2d 585, 589-91 (1966), the court determined that the Homestead Tax Relief Act, which provided tax credits to needy individuals over sixty-five years old, was a relief measure. The court made that determination based on the following considerations: (1) the statute itself stated that it was a relief statute; (2) the relief was afforded to renters, who did not pay property taxes; (3) the credit was tied to the individual's characteristics — e.g., shelter cost, age and income — and not to the characteristics of the property; (4) the property owners receiving the relief paid their property tax bill in full and received a credit against their income taxes from the state's general fund; and (5) the administration of the law was tied to the income tax system rather than to the property tax system. Id.
The characteristics of the Harvey statute are the criteria by which we determine whether a statute is a relief statute. In Torphy, the court determined that the Improvements Tax Relief Act, which provided tax credits paid from the general revenue fund to property own[456]*456ers for building and garage improvements resulting in an increased property tax assessment, was a tax statute rather than a relief statute. Torphy, 85 Wis. 2d at 107, 270 N.W.2d at 192. The court noted that, unlike the Act in Harvey, the legislature had referred to the law as a tax statute in the language of the statute; that the credit was not available to renters; and that claimants qualified for the credit on the basis of the property's characteristics, value and age.
On the other hand, like the Act in Harvey, the claimants were required to pay their property tax bills in full and received a credit against their income taxes from the state's general fund.
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DYKMAN, J.
The estate of Dorothy McManus appeals from a circuit court order affirming a decision of the Tax Appeals Commission in a ch. 227, Stats., review and declaring constitutional the Farmland Preservation Credit statute, sec. 71.09(11), Stats. (1977-78).1 The Commission had sustained a Department of Revenue decision, denying Dorothy McManus a tax credit under the statute. The issues are whether sec. 71.09(11) is a tax provision; and if so, whether it violates the uniformity of taxation clause, art. VIII, sec. 1 of the Wisconsin Constitution2 We conclude sec. 71.09(11) is not a tax statute. Accordingly, we affirm without reaching the constitutional issue.
BACKGROUND
The parties stipulated to the facts. In 1978, Dorothy and Jack McManus owned 331.3 acres of farmland as joint tenants. That year the McManuses had $180,987 in [453]*453household income. Dorothy's income was approximately $6,000.
Dorothy applied for a farmland preservation credit of $1,836.80 based on her interest in the land.3 The Department of Revenue denied her claim because her household income exceeded $38,429, the maximum allowed under the statute. The Tax Appeals Commission upheld the determination on the same ground.
In a ch. 227, Stats., review, the circuit court affirmed the commission's decision, finding that sec. 71.09(11), Stats., limited eligibility for the tax credit by the amount of the claimant's household income. The court also declared that the statute was constitutional after rejecting due process, equal protection and uniformity of taxation claims. On appeal, the estate maintains only its uniformity of taxation challenge to sec. 71.09(11) under Wis. Const. art. VIII, sec. 1.
STANDARD OF REVIEW
Whether sec. 71.09(11), Stats., is a tax statute and whether the statute contravenes the uniformity clause are both questions of law. We generally accord deference to the Tax Appeal Commission's legal conclusions, although we are not bound by those conclusions. Revenue Dept. v. Lake Wisconsin Country Club, 123 Wis. 2d 239, 242-43, 365 N.W.2d 916, 918 (Ct. App. 1985). But see Drivers Local No. 695 v. LIRC, 154 Wis. 2d 75, 82-83, 452 N.W.2d 368, 371-72 (1990) (agency's interpretation of statute not entitled to weight unless long continued, substantially uniform and without judicial [454]*454challenge); contra Samens v. LIRC, 117 Wis. 2d 646, 673-74, 345 N.W.2d 432, 444 (1984) (agency's interpretation of statute entitled to weight where question one of first impression).
Here, the Tax Appeals Commission did not consider the constitutional question because it lacked the authority to do so. See Wisconsin Socialist Workers 1976 Campaign Committee v. McCann, 433 F. Supp. 540, 545 (E.D. Wis. 1977) (Administrative agencies have no authority to rule on the constitutionality of statutes they enforce.). The trial court reached the constitutional question. We decide such issues without deference to the trial court. O'Donnell v. Reivitz, 144 Wis. 2d 717, 725, 424 N.W.2d 733, 735 (Ct. App. 1988).
The unconstitutionality of any statute must be established beyond a reasonable doubt, and every presumption must be indulged to sustain the law if at all possible. Quinn v. Town of Dodgeville, 122 Wis. 2d 570, 577, 364 N.W.2d 149, 154 (1985). "[WJhere a tax measure is involved, the presumption of constitutionality is strongest." Department of Revenue v. Moebius Printing Co., 89 Wis. 2d 610, 625, 279 N.W.2d 213, 219 (1979).
DISCUSSION
We must first determine whether sec. 71.09(11), Stats., is a property tax statute. The rule that taxation shall be uniform applies to the taxation of property, not income. Gottlieb v. Milwaukee, 33 Wis. 2d 408, 427-28, 147 N.W.2d 633, 643 (1967). A 1974 amendment to Wis. Const. art. VIII, sec. 1 excepted agricultural land from the uniformity requirement. Under the amendment, agricultural land may be taxed in a manner that is not [455]*455uniform with the taxation of other real property. However, the uniformity requirement still applies within the agricultural classification itself. 68 Op. Att'y Gen. 179, 181 (1979). Thus, a tax law that granted a partial exemption to some agricultural lands and not others would violate the uniformity requirement. State ex rel. La Follette v. Torphy, 85 Wis. 2d 94, 106, 270 N.W.2d 187, 192 (1978).
The estate maintains that sec. 71.09(11), Stats., is a tax statute and that its effect is to partially exempt some farmland from full taxation. The department, on the other hand, argues that the statute is a relief statute and that consequently the uniformity provision does not apply.
In State ex rel. Harvey v. Morgan, 30 Wis. 2d 1, 10-14, 139 N.W.2d 585, 589-91 (1966), the court determined that the Homestead Tax Relief Act, which provided tax credits to needy individuals over sixty-five years old, was a relief measure. The court made that determination based on the following considerations: (1) the statute itself stated that it was a relief statute; (2) the relief was afforded to renters, who did not pay property taxes; (3) the credit was tied to the individual's characteristics — e.g., shelter cost, age and income — and not to the characteristics of the property; (4) the property owners receiving the relief paid their property tax bill in full and received a credit against their income taxes from the state's general fund; and (5) the administration of the law was tied to the income tax system rather than to the property tax system. Id.
The characteristics of the Harvey statute are the criteria by which we determine whether a statute is a relief statute. In Torphy, the court determined that the Improvements Tax Relief Act, which provided tax credits paid from the general revenue fund to property own[456]*456ers for building and garage improvements resulting in an increased property tax assessment, was a tax statute rather than a relief statute. Torphy, 85 Wis. 2d at 107, 270 N.W.2d at 192. The court noted that, unlike the Act in Harvey, the legislature had referred to the law as a tax statute in the language of the statute; that the credit was not available to renters; and that claimants qualified for the credit on the basis of the property's characteristics, value and age.
On the other hand, like the Act in Harvey, the claimants were required to pay their property tax bills in full and received a credit against their income taxes from the state's general fund. However, the court characterized the statute as "integrated to the property tax process through the involvement of the local taxing authority by requiring them to provide assessment figures necessary to calculate the credits." Torphy, 85 Wis. 2d at 105, 270 N.W.2d at 191. The court stressed that the "persuasive individual relief aspects" of Harvey were not present in this case and that no attempt was made to determine whether a claimant was in need of a tax credit. Torphy, 85 Wis. 2d at 105, 270 N.W.2d 191. The court held the Improvements Tax Relief Act unconstitutional.
As the trial court observed, the farmland preservation credit statute falls somewhere between the statutes considered in Harvey and Torphy. The stated purpose of the statute is "to provide credit to owners of farmland which is subject to agricultural use restrictions, through a system of income tax credits and refunds and appropriations from the general fund." Sec. 71.09(11), Stats. To qualify for the credit, the claimant must own farmland subject to a farmland preservation agreement or subject to exclusive agricultural zoning ordinances. Secs. 91.01(7) and 91.71, Stats. (1977-78). The agreement is a [457]*457restrictive covenant, in which the owner agrees to maintain the agricultural character of his or her land for ten to twenty-five years. Sec. 91.13(10) (1977-78). Due to the way in which the credit is calculated, a claimant will not receive a credit if his or her household income4 exceeds $38,429. Thus, while the legislature did not refer to the law as a relief statute, the purpose of the farmland preservation credit is to provide economic relief to those needy farmland owners whose land becomes subjected to use restrictions.
The statute does not afford relief to renters of farmland. As the trial court explained, this fact is logically consistent with the statute's purpose. "While the costs of high property taxes are passed down in some measure to renters, the costs imposed by exclusive agricultural zoning fall almost entirely on the property owner."
Consistent with its relief purpose, the credit is tied to the claimant's income. The estate argues that, because "claimant" is defined as "an owner of farmland," the credit is tied to the characteristics of the property rather than the individual. It is true that an individual cannot qualify for the credit unless he or she owns farmland subject to certain land use restrictions. However, it is also true that only those whose income does not exceed $38,429 will qualify for the credit. In this respect, this case differs from Torphy. There, the court determined that the statute under review was a tax statute primarily because
The persuasive individual relief aspects in the Harvey Case, supra, are absent in the present case. The [458]*458statute here qualifies taxpayers for credit on the basis of the property's characteristics, value and age. No attempt is made to ascertain whether the particular taxpayer is in need of a tax credit. The taxpayer's financial situation is irrelevant since it is the property that qualifies for the credit.
Torphy, 85 Wis. 2d at 105, 270 N.W.2d at 191.
Like the Act in Harvey, those receiving the credit must pay their property tax bill in full and receive a credit against their income taxes from the state's general fund. The estate, nevertheless, argues that the administration of the statute is tied to the property tax system because, in support of their claims, claimants are required to submit a copy of their property tax bill. Sec. 71.09(1 l)(h), Stats. We disagree.
The fact that the claimant must supply the department with a copy of his or her property tax bill does not mean that the administration of the statute is tied to the property tax system. In both Harvey and Torphy, claimants had to submit copies of their tax bills. In Torphy, the court determined that the Act under review was integrated with the property tax system because the local taxing authority was required to provide the assessment figures on which the tax could be calculated. Torphy, 85 Wis. 2d at 105, 270 N.W.2d at 191. No such requirement exists here.
We conclude that the farmland preservation credit law is a relief statute and is therefore not subject to the uniformity requirement. Harvey, 30 Wis. 2d at 10, 139 N.W.2d at 589.
The estate also argues that it is entitled to the credit under the reasoning of McManus v. Department of Revenue, 91 Wis. 2d 682, 283 N.W.2d 576 (1979). The estate raises this argument under the rubric of a uniformity of [459]*459taxation challenge. Although the estate's claim has nothing to do with the uniformity clause, we will address it briefly.
In McManus, Jack sought to deduct all the farm losses on his personal state income tax return, though he and Dorothy owned the farmland in joint tenancy. The court determined that Jack was not entitled to claim all the farm losses but only his proportionate share, holding that losses must be attributed to joint tenants in equal amounts. McManus, 91 Wis. 2d at 690, 283 N.W.2d at 580.
Here, the estate argues that, consistent with McManus, a joint tenant should be entitled to his or her proportionate share of the farmland preservation credit and that eligibility for the credit should be determined on the basis of the joint tenant's individual income. Because Dorothy's income was within the statute's maximum, she should be entitled to half the credit for which the farm would otherwise qualify. We disagree.
Under sec. 71.09(11), Stats., joint tenants are allowed their proportionate share of the farmland preservation credit as long as the joint tenant's household income does not exceed $38,429.5 In McManus, because the farm was held in joint tenancy, the losses had to be split among the joint tenants. This would be true no matter whether the joint tenants were members of the [460]*460same household. Eligibility for the farmland credit, however, is based on household income. If Dorothy held the land in joint tenancy with a non-household member, she would still be ineligible for the credit because her household income exceeds the statute's maximum.
The estate has not shown that the legislature is forbidden to determine a claimant's eligibility for a tax credit under a relief statute based on the claimant's household income. Because McManus does not stand for such a proposition, we reject the estate's argument.
By the Court. — Order affirmed.