OPINION
BRYNER, Justice.
The Kenai Peninsula Borough sued to collect a full year’s tax on the assessed value of a locally-harbored vessel. The borough had charged the tax to the registered owner of the vessel as of its assessment date — the first day of the tax year — but the owner sold the vessel several months after assessment and refused to pay. The superior court ruled that the Federal Constitution’s Due Process and Commerce Clauses required reduction of the .tax to reflect the vessel’s post-assessment sale and its departure from borough waters. We reverse, holding that the vessel’s tax status became fixed for the full tax year on the date of its assessment and that the Constitution requires no adjustment for post-assessment changes.
I.
FACTS
In 1987, Kenneth Arndt (Arndt) paid $585,000 to buy the
M/V Krystal Sea,
a 134-foot, 187-gross-ton vessel. Arndt registered the
Krystal Sea
⅛ home port in Homer, within the Kenai Peninsula Borough (the KPB or the borough). From November 1989 to May 1991, the
Krystal Sea
was under charter to Underwater Construction, Inc., (UCI) an Anchorage company. Although the
Krystal Sea
spent part of its chartered time outside the KPB waters, it remained registered to Arndt in Homer, worked out of the Homer harbor part of the time, and was kept in the harbor when not actively working.
It is undisputed that the
Krystal Sea
was moored in the Homer harbor on January 1, 1991, and that it had an established tax situs in the KPB on that date. The
Krystal Sea
remained at harbor through March and worked out of Homer during April and early May. On May 19, UCI exercised an option to buy the
Krystal Sea
from Arndt for $850,000. UCI then took the vessel to Anchorage, Seattle, and the South Pacific for the remainder of the year.
In February 1991, three months before selling the
Krystal Sea
to UCI, Arndt filed a 1991 personal property tax statement with the KPB identifying himself as the vessel’s owner. Arndt added a handwritten note indicating that he would be selling the vessel; he requested the borough to send UCI the tax bill. After informing Arndt that it could not bill UCI without a copy of the documents transferring title, the borough sent him a notice appraising the
Krystal Sea
at $468,-000. Soon after selling the
Krystal Sea,
Arndt sent a copy of the bill of sale to the KPB and again requested the borough to send UCI the tax notice. However, the KPB notified Arndt that he remained responsible for paying the full amount of the 1991 tax, and in July the KPB sent Arndt a tax bill for $7,394.40.
Arndt failed to pay the bill. In April 1992 the KPB filed suit in the district court to collect the delinquent taxes. In response, Arndt denied owning the
Krystal Sea
and asserted that the KPB’s efforts to tax him were “unconstitutional and illegal.” Arndt contended that his sale of the vessel to UCI required the 1991 tax to be apportioned. He further claimed, however, that because the KPB’s ordinances contained no express provision authorizing apportionment, the borough lacked apportionment power. Arndt thus maintained that he owed the KPB nothing.
The district court rejected Arndt’s arguments and entered summary judgment against him. Arndt appealed to the superior court, which reversed the district court on constitutional grounds. Relying on the Due Process Clause, the superior court ruled that, regardless of where the
Krystal Sea
was taken after Arndt sold it in May 1991, the KPB violated the Federal Constitution by holding Arndt “liable for taxes accrued on property after he had relinquished all of his ownership interest.” Alternatively, relying on the Commerce Clause, the court ruled that, because the
Krystal Sea
“severed its ties to the KPB and the State of Alaska” in May 1991, the KPB “was without constitutional authority to levy a tax on [Arndt] or the new owner.” After finding that the KPB had inherent authority to apportion taxes when constitutionally necessary, the superior court remanded to the district court for entry of judgment in an amount reduced to reflect the portion of 1991 during which Arndt actually owned the
Krystal Sea.
Following the district court’s entry of an amended judgment apportioned in accordance with the superior court’s directive, and after a renewed appeal in which the superior court affirmed the amended judgment with only minor alterations, the KPB petitioned this court for a hearing to review the superi- or court’s rulings.
See
Alaska R.App. P. 301(b). We granted the petition and ordered briefing on the merits.
II.
DISCUSSION
The outer limits of the KPB’s power to tax personal property are defined by the United States Constitution’s Due Process and Commerce Clauses.
Due process re
quires a minimal nexus between the borough and the property it taxes.
See Braniff Airways v. Nebraska State Bd. of Equalization & Assessment,
347 U.S. 590, 599-600, 74 S.Ct. 757, 98 L.Ed. 967 (1954);
Gulf Oil Corp. v. State, Dep’t of Revenue,
755 P.2d 372, 383 n. 33 (Alaska 1988). “So far as due process is concerned the only question is whether the tax in practical operation has relation to opportunities, benefits, or protection conferred or afforded by the taxing State.”
Ott v. Mississippi Valley Barge Line Co.,
336 U.S. 169, 174, 69 S.Ct. 432, 93 L.Ed. 585 (1949).
See also Sjong v. State, Dep’t of Revenue,
622 P.2d 967, 970 (Alaska 1981) (holding that the due process question turns on “ ‘whether the state has given anything for which it can ask return’ ”) (quoting
Wisconsin v. J.C. Penney Co.,
311 U.S. 435, 444, 61 S.Ct. 246, 85 L.Ed. 267 (1940)).
However, “the Due Process Clause [does not] confine the domiciliary State’s taxing power to such proportion of the value of the property being taxed as is equal to the fraction of the tax year which the property spends within the State’s borders.”
See Central R.R. Co. v. Pennsylvania,
370 U.S. 607, 612, 82 S.Ct. 1297, 8 L.Ed.2d 720 (1962). Rather, due process only bars taxation of personal property that is permanently situated outside the taxing jurisdiction.
See id.; Union Refrigerator Transit Co. v. Kentucky,
199 U.S. 194, 202, 26 S.Ct. 36, 50 L.Ed.
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OPINION
BRYNER, Justice.
The Kenai Peninsula Borough sued to collect a full year’s tax on the assessed value of a locally-harbored vessel. The borough had charged the tax to the registered owner of the vessel as of its assessment date — the first day of the tax year — but the owner sold the vessel several months after assessment and refused to pay. The superior court ruled that the Federal Constitution’s Due Process and Commerce Clauses required reduction of the .tax to reflect the vessel’s post-assessment sale and its departure from borough waters. We reverse, holding that the vessel’s tax status became fixed for the full tax year on the date of its assessment and that the Constitution requires no adjustment for post-assessment changes.
I.
FACTS
In 1987, Kenneth Arndt (Arndt) paid $585,000 to buy the
M/V Krystal Sea,
a 134-foot, 187-gross-ton vessel. Arndt registered the
Krystal Sea
⅛ home port in Homer, within the Kenai Peninsula Borough (the KPB or the borough). From November 1989 to May 1991, the
Krystal Sea
was under charter to Underwater Construction, Inc., (UCI) an Anchorage company. Although the
Krystal Sea
spent part of its chartered time outside the KPB waters, it remained registered to Arndt in Homer, worked out of the Homer harbor part of the time, and was kept in the harbor when not actively working.
It is undisputed that the
Krystal Sea
was moored in the Homer harbor on January 1, 1991, and that it had an established tax situs in the KPB on that date. The
Krystal Sea
remained at harbor through March and worked out of Homer during April and early May. On May 19, UCI exercised an option to buy the
Krystal Sea
from Arndt for $850,000. UCI then took the vessel to Anchorage, Seattle, and the South Pacific for the remainder of the year.
In February 1991, three months before selling the
Krystal Sea
to UCI, Arndt filed a 1991 personal property tax statement with the KPB identifying himself as the vessel’s owner. Arndt added a handwritten note indicating that he would be selling the vessel; he requested the borough to send UCI the tax bill. After informing Arndt that it could not bill UCI without a copy of the documents transferring title, the borough sent him a notice appraising the
Krystal Sea
at $468,-000. Soon after selling the
Krystal Sea,
Arndt sent a copy of the bill of sale to the KPB and again requested the borough to send UCI the tax notice. However, the KPB notified Arndt that he remained responsible for paying the full amount of the 1991 tax, and in July the KPB sent Arndt a tax bill for $7,394.40.
Arndt failed to pay the bill. In April 1992 the KPB filed suit in the district court to collect the delinquent taxes. In response, Arndt denied owning the
Krystal Sea
and asserted that the KPB’s efforts to tax him were “unconstitutional and illegal.” Arndt contended that his sale of the vessel to UCI required the 1991 tax to be apportioned. He further claimed, however, that because the KPB’s ordinances contained no express provision authorizing apportionment, the borough lacked apportionment power. Arndt thus maintained that he owed the KPB nothing.
The district court rejected Arndt’s arguments and entered summary judgment against him. Arndt appealed to the superior court, which reversed the district court on constitutional grounds. Relying on the Due Process Clause, the superior court ruled that, regardless of where the
Krystal Sea
was taken after Arndt sold it in May 1991, the KPB violated the Federal Constitution by holding Arndt “liable for taxes accrued on property after he had relinquished all of his ownership interest.” Alternatively, relying on the Commerce Clause, the court ruled that, because the
Krystal Sea
“severed its ties to the KPB and the State of Alaska” in May 1991, the KPB “was without constitutional authority to levy a tax on [Arndt] or the new owner.” After finding that the KPB had inherent authority to apportion taxes when constitutionally necessary, the superior court remanded to the district court for entry of judgment in an amount reduced to reflect the portion of 1991 during which Arndt actually owned the
Krystal Sea.
Following the district court’s entry of an amended judgment apportioned in accordance with the superior court’s directive, and after a renewed appeal in which the superior court affirmed the amended judgment with only minor alterations, the KPB petitioned this court for a hearing to review the superi- or court’s rulings.
See
Alaska R.App. P. 301(b). We granted the petition and ordered briefing on the merits.
II.
DISCUSSION
The outer limits of the KPB’s power to tax personal property are defined by the United States Constitution’s Due Process and Commerce Clauses.
Due process re
quires a minimal nexus between the borough and the property it taxes.
See Braniff Airways v. Nebraska State Bd. of Equalization & Assessment,
347 U.S. 590, 599-600, 74 S.Ct. 757, 98 L.Ed. 967 (1954);
Gulf Oil Corp. v. State, Dep’t of Revenue,
755 P.2d 372, 383 n. 33 (Alaska 1988). “So far as due process is concerned the only question is whether the tax in practical operation has relation to opportunities, benefits, or protection conferred or afforded by the taxing State.”
Ott v. Mississippi Valley Barge Line Co.,
336 U.S. 169, 174, 69 S.Ct. 432, 93 L.Ed. 585 (1949).
See also Sjong v. State, Dep’t of Revenue,
622 P.2d 967, 970 (Alaska 1981) (holding that the due process question turns on “ ‘whether the state has given anything for which it can ask return’ ”) (quoting
Wisconsin v. J.C. Penney Co.,
311 U.S. 435, 444, 61 S.Ct. 246, 85 L.Ed. 267 (1940)).
However, “the Due Process Clause [does not] confine the domiciliary State’s taxing power to such proportion of the value of the property being taxed as is equal to the fraction of the tax year which the property spends within the State’s borders.”
See Central R.R. Co. v. Pennsylvania,
370 U.S. 607, 612, 82 S.Ct. 1297, 8 L.Ed.2d 720 (1962). Rather, due process only bars taxation of personal property that is permanently situated outside the taxing jurisdiction.
See id.; Union Refrigerator Transit Co. v. Kentucky,
199 U.S. 194, 202, 26 S.Ct. 36, 50 L.Ed. 150 (1905) (finding that due process is violated by taxation of property “wholly within the taxing power of another state”).
■ To the limitations imposed by due process, the Commerce Clause adds only one dimension: “an additional requirement that the tax not discriminate against interstate or foreign commerce.”
Gulf Oil Corp.,
755 P.2d at 383 n. 33.
See also Japan Line, Ltd. v. County of Los Angeles,
441 U.S. 434, 444-45, 99 S.Ct. 1813, 60 L.Ed.2d 336 (1979). “It is only multiple taxation of interstate operations that offends the Commerce Clause.”
Central R.R. Co.,
370 U.S. at 612, 82 S.Ct. 1297 (citations and internal markings omitted). Hence, the Commerce Clause is triggered only upon an affirmative showing that property taxed by one jurisdiction has another taxable situs and could be taxed elsewhere: “[T]he burden is on the taxpayer who contends that some portion of its total assets are beyond the reach of the taxing power of its domicile to prove that the same property may be similarly taxed in another jurisdiction.”
Id.
at 613, 82 S.Ct. 1297.
It is undisputed that the
Krystal Sea’s
primary tax situs was within thé KPB when the vessel was assessed on January 1, 1991. It is also undisputed that Arndt did not prove that the vessel could be taxed by some other jurisdiction in 1991, the tax year in question. The superior court nonetheless concluded that due process required apportionment of the 1991 tax because, after May 19, 1991, Arndt no longer owned the
Krystal Sea.
The court further concluded that the Commerce Clause required apportionment because the vessel’s new owner had removed it from the KPB and because Arndt should not be burdened with proving the
Krystal Sea’s
new tax situs.
In reaching these conclusions, the superior court relied on the assumption that Arndt’s tax liability for 1991 “accrued” day by day throughout the year. A review of the KPB’s personal property taxation process, however, reveals this assumption to be mistaken.
The KPB’s taxation process is controlled by a mix of Alaska and borough law. Under AS 29.45.240(a),, the KPB is empowered to “assess, levy, and collect a property tax ... by means of an ordinance.” The KPB assessor must “assess property at its full and true value as of January 1 of the assessment year,” AS 29.45.110(a), and is authorized to “require each person having ownership or control of or an interest in property to submit a return ... based on property values ... existing on January 1” of any given tax year. AS 29.45.120(a). Based on the authority conferred by these statutes, Kenai Peninsula Borough Ordinance (KPBO) 05.12.120 provides for all personal property within the borough’s limits to be taxed at a rate of “not more than 8 mills on the assessed valuation.”
Kenai Peninsula Borough Resolution (KPBR) 77-11 specifies January 1 as the date for determining the presence of property in the borough: “All personal property
which is located within the Kenai Peninsula Borough on January 1st of any tax assessment year is subject to the tax if the property has a tax situs within the borough.”
Pursuant to AS 29.45.300, “[t]he owner of assessed personal property is personally liable for the amount of taxes assessed against the property.” This statute is mirrored by KPBO 05.12.120, which provides that “the owner [of property] shall be liable for payment of the tax.”
These provisions expressly require the value of property to be set as of the assessment date each year, January 1. AS 29.45.110(a); AS 29.45.120(a); KPBR 77-11. They also designate January 1 as the relevant date for determining the property’s tax situs — its location within the KPB. AS 29.45.120(a); KPBR 77-11. And they specify that the owner of the property on that date is the one “personally liable” for payment of the tax. AS 29.45.300; KPBO 05.12.120. Thus, when read together, these provisions describe a system of property taxation in which the principal attributes of tax status — value, si-tus, and ownership — are determined as of January 1 each year and remain fixed throughout the year that follows. Because tax status, once determined under these provisions, in turn determines each year’s levy, it follows that the KPB’s property tax itself becomes fixed each year as of the date of assessment. The tax “accrues” in full each year on January 1.
A tax system structured in this manner offends neither due process nor the Commerce Clause. The system neither eliminates nor dilutes the need to establish a valid tax situs — a nexus between the borough and the property ensuring that “the tax in practical operation has relation to opportunities, benefits, or protection conferred or afforded by the taxing State.”
Ott v. Mississippi Valley Barge Line Co.,
336 U.S. 169, 174, 69 S.Ct. 432, 93 L.Ed. 585 (1949). Rather, by demanding evidence of a nexus already established at the time of assessment, the system necessarily focuses on opportunities and benefits conferred in the year preceding assessment.
A retrospective focus of this kind is not in itself a cause of constitutional concern:
There is no talismanic quality or significance of constitutional dimension in the ‘tax year’ such that absence from the State of personal property all during that year should automatically invalidate an assessment denominated ‘for’ that year but statutorily based upon location in the State of property upon a certain date preceding, but not unduly remote therefrom, and reasonably referable to that year.
City of Bayonne v. International Nickel Co.,
104 N.J.Super. 45, 248 A.2d 547, 553 (N.J.Super.App.Div.1968).
Nor does the retrospective nature of the KPB’s system appreciably enlarge the danger of arbitrary or multiple taxation. The KPB’s failure to adjust current taxes for changes in status occurring during the year of assessment creates no risk of unfairness to a taxpayer who remains in the borough, since these post-assessment changes will be captured and taken into account when the KPB assesses for the next tax year. The KPB’s system likewise creates no increased risk of multiple taxation for property that moves from year to year within Alaska, since, as we have seen, the KPB’s retrospective property tax approach is largely a creature of Alaska law and must thus be applied uniformly throughout the state.
Moreover, insofar as the Commerce Clause is a matter of concern, the KPB’s system creates no added risk of multiple taxation beyond the state’s borders, because a similar approach to taxation of personal property prevails nationwide: “The well-nigh universal rule in this country is that the tax status and value of property is set for the entire fiscal year on the assessment date.”
Appeal of Title Serv., Inc.,
433 Pa. 535, 252 A.2d 585, 587 (1969).
The proposition thus appears widely settled that post-assessment changes in value, situs, and ownership of taxed property require no change in tax for the corresponding assessment year.
Accordingly, -apportionment of Arndt’s 1991 tax for the
Krystal Sea
was not necessary to avoid an unconstitutional taking of Arndt’s property or to prevent the possibility of multiple taxation. Arndt’s ownership of
the
Krystal Sea
on January 1, 1991, the vessel’s tax situs within the KPB on that date, and its value at the time are firmly established by record evidence and were never seriously disputed. Because Arndt became personally liable for the full 1991 tax based on the
Krystal Sea’s
tax status on January 1, 1991, and because he failed to allege or show circumstances indicating any actual danger of multiple taxation, his post-assessment transfer of the vessel and its post-transfer departure from the borough are irrelevant for purposes of the 1991 tax.
III.
CONCLUSION
We thus conclude that the superior court erred in reversing the district court’s original judgment granting summary judgment to the KPB.
Accordingly, we VACATE the superi- or court’s appellate rulings and REMAND the case to the district court with directions to reenter judgment for the KPB in accordance with this opinion.
MATTHEWS, C.J., not participating.