OPINION
RABINOWITZ, Justice.
I. FACTS
This appeal involves a property tax dispute between Alascom, Inc. (Alascom) and the North Slope Borough (Borough). In 1979, the Borough audited Alacom’s books and determined that a substantial amount of real and personal property owned by Alascom had not been taxed in fiscal years 1974 through 1979.1 Based upon this audit, the Borough demanded additional property taxes of approximately a quarter-million dollars, plus interest and penalties.2 Alas-com paid the demanded sums under protest and appealed the assessment to the Borough’s Board of Equalization, contending that the Borough did not have authority to levy taxes for prior years. The Board rejected Alascom’s claim, and its ruling was affirmed by the superior court. For the reasons set forth below we conclude that the superior court’s holding regarding Alas-com’s tax liability should be affirmed. However, we reverse that portion of the judgment awarding the Borough interest and penalties on the tardily-assessed real property taxes.
II. THE BOROUGH’S POWER TO TAX ESCAPED PROPERTY
The threshold question in this casé is when the Borough may assess and tax property that should have been, but was not, taxed in prior years. The state statutes and Borough ordinances governing property taxation3 recognize that property will occasionally escape taxation and require the Borough to prepare a supplemental assessment roll including the escaped property.4 The statutes and ordinances do not, however, provide a clear answer to the question that is of importance here: when, if ever, does the Borough’s power to assess and tax escaped property expire?
Alascom’s first point is that a supplemental assessment roll for omitted property [1178]*1178must be prepared annually because AS 29.-53.150 requires that a supplemental roll be prepared “using the procedures ... for the original roll” and AS 29.53.100(a) requires that an original roll be prepared annually. Alascom argues that the Borough’s failure to include property on a supplemental roll during a given fiscal year precludes later inclusion of that property on a supplemental roll.
In preparing a supplemental assessment roll, however, the Borough will never be able to comply with all of the “procedures ... for the original roll.” Literal compliance would require that the Borough follow the time-table for preparation of the original roll. If compliance with this timetable were required, there would be no occasion to prepare a supplemental roll and the statutory requirement of a supplemental roll would be rendered superfluous. In order to avoid rendering that requirement irrelevant,5 we construe the statutory language requiring adherence to the “procedures ... for the original roll” as addressing the manner in which the Borough must apprise a taxpayer of his tax liability6 and the procedures for review of an assessment7 rather than as addressing the time as of which a supplemental assessment roll must be prepared.8
Alascom’s second argument is that the principle of finality announced in Anchorage Independent School District v. Stephens, 370 P.2d 531 (Alaska 1962) prevents the Borough from demanding prior years’ taxes. We disagree.
In Stephens we ruled that a taxing authority may not reassess a parcel after giving the taxpayer notice of the assessed value and accepting payment of taxes.9 In the case at hand, however, we are dealing not with an attempt to revalue retroactively property that has already been taxed, but with an attempt to tax for the first time property that has escaped taxation entirely. Although our ruling in Stephens would prevent the Borough from retroactively raising the assessed value of a parcel or an item, that ruling has no applicability, in a case in [1179]*1179which the property in question escaped assessment and taxation.
III. STATUTE OF LIMITATIONS
The next issues in dispute are whether any statute of limitations may be applied to supplemental assessments and, if so, whether the appropriate limitations period is two years10 or six years.11
The Borough argues that application of any statute of limitations would contravene Article 9, section 1 of the Alaska Constitution, which provides:
The power of taxation shall never be surrendered. This power shall not be suspended or contracted away, except as provided in this article.
The Borough’s position is that applying a statute of limitations to tax assessments and collections would constitute an unconstitutional surrender or suspension of the taxing power. We believe that the response to the Borough’s contention is provided by Article 9, section 4, of the Alaska Constitution, the provision addressing exemptions from taxation.12 After setting forth specific exemptions this provision states that “[o]ther exemptions of like or different kind may be granted by general law” (emphasis supplied). In our view this constitutional grant of power to except encompasses the power to require that taxes be assessed and collected within a certain period of time or be forever barred.
Alascom argues that the two-year statute of limitations applicable to liabilities created by statute, AS 09.10.070(3), should be applied to the Borough’s efforts to levy past years’ taxes. The superior court ruled, however, that the six-year statute of limitations governing actions by political subdivisions, AS 09.10.120, is instead applicable. Our review of the history of the six-year statute has convinced us that that statute was intended to apply.
Prior to 1962, the statute of limitations governing actions by political subdivisions provided:
The limitations prescribed in this article shall apply to actions brought in the name of any public corporation in the Territory, or for its benefit, in the same manner as to actions by private parties.
Alaska Comp.Laws Ann. § 55-2-12 (1949). Under this provision the appropriate statute of limitations was determined in the same manner as statutes of limitations applicable to private parties — by the nature of the underlying claim. In 1962, the legislature repealed this provision and substituted in its place AS 09.10.120. This 1962 version deletes any reference to actions by private parties, thus substituting an across-the-board six-year statute of limitations for the earlier rule that the limitations period would be determined by the nature of the claim. In our view, the 1962 amendment evinces a legislative intent that a general six-year statute of limitations applies when a borough pursues a claim, regardless of the nature of the claim. Thus, we hold that the six-year statute of limitations applies in this case.13
[1180]*1180IV. INTEREST AND PENALTIES
The final issue before us is whether the Borough may demand interest14 and penalties15 on the tardily-assessed taxes.16
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OPINION
RABINOWITZ, Justice.
I. FACTS
This appeal involves a property tax dispute between Alascom, Inc. (Alascom) and the North Slope Borough (Borough). In 1979, the Borough audited Alacom’s books and determined that a substantial amount of real and personal property owned by Alascom had not been taxed in fiscal years 1974 through 1979.1 Based upon this audit, the Borough demanded additional property taxes of approximately a quarter-million dollars, plus interest and penalties.2 Alas-com paid the demanded sums under protest and appealed the assessment to the Borough’s Board of Equalization, contending that the Borough did not have authority to levy taxes for prior years. The Board rejected Alascom’s claim, and its ruling was affirmed by the superior court. For the reasons set forth below we conclude that the superior court’s holding regarding Alas-com’s tax liability should be affirmed. However, we reverse that portion of the judgment awarding the Borough interest and penalties on the tardily-assessed real property taxes.
II. THE BOROUGH’S POWER TO TAX ESCAPED PROPERTY
The threshold question in this casé is when the Borough may assess and tax property that should have been, but was not, taxed in prior years. The state statutes and Borough ordinances governing property taxation3 recognize that property will occasionally escape taxation and require the Borough to prepare a supplemental assessment roll including the escaped property.4 The statutes and ordinances do not, however, provide a clear answer to the question that is of importance here: when, if ever, does the Borough’s power to assess and tax escaped property expire?
Alascom’s first point is that a supplemental assessment roll for omitted property [1178]*1178must be prepared annually because AS 29.-53.150 requires that a supplemental roll be prepared “using the procedures ... for the original roll” and AS 29.53.100(a) requires that an original roll be prepared annually. Alascom argues that the Borough’s failure to include property on a supplemental roll during a given fiscal year precludes later inclusion of that property on a supplemental roll.
In preparing a supplemental assessment roll, however, the Borough will never be able to comply with all of the “procedures ... for the original roll.” Literal compliance would require that the Borough follow the time-table for preparation of the original roll. If compliance with this timetable were required, there would be no occasion to prepare a supplemental roll and the statutory requirement of a supplemental roll would be rendered superfluous. In order to avoid rendering that requirement irrelevant,5 we construe the statutory language requiring adherence to the “procedures ... for the original roll” as addressing the manner in which the Borough must apprise a taxpayer of his tax liability6 and the procedures for review of an assessment7 rather than as addressing the time as of which a supplemental assessment roll must be prepared.8
Alascom’s second argument is that the principle of finality announced in Anchorage Independent School District v. Stephens, 370 P.2d 531 (Alaska 1962) prevents the Borough from demanding prior years’ taxes. We disagree.
In Stephens we ruled that a taxing authority may not reassess a parcel after giving the taxpayer notice of the assessed value and accepting payment of taxes.9 In the case at hand, however, we are dealing not with an attempt to revalue retroactively property that has already been taxed, but with an attempt to tax for the first time property that has escaped taxation entirely. Although our ruling in Stephens would prevent the Borough from retroactively raising the assessed value of a parcel or an item, that ruling has no applicability, in a case in [1179]*1179which the property in question escaped assessment and taxation.
III. STATUTE OF LIMITATIONS
The next issues in dispute are whether any statute of limitations may be applied to supplemental assessments and, if so, whether the appropriate limitations period is two years10 or six years.11
The Borough argues that application of any statute of limitations would contravene Article 9, section 1 of the Alaska Constitution, which provides:
The power of taxation shall never be surrendered. This power shall not be suspended or contracted away, except as provided in this article.
The Borough’s position is that applying a statute of limitations to tax assessments and collections would constitute an unconstitutional surrender or suspension of the taxing power. We believe that the response to the Borough’s contention is provided by Article 9, section 4, of the Alaska Constitution, the provision addressing exemptions from taxation.12 After setting forth specific exemptions this provision states that “[o]ther exemptions of like or different kind may be granted by general law” (emphasis supplied). In our view this constitutional grant of power to except encompasses the power to require that taxes be assessed and collected within a certain period of time or be forever barred.
Alascom argues that the two-year statute of limitations applicable to liabilities created by statute, AS 09.10.070(3), should be applied to the Borough’s efforts to levy past years’ taxes. The superior court ruled, however, that the six-year statute of limitations governing actions by political subdivisions, AS 09.10.120, is instead applicable. Our review of the history of the six-year statute has convinced us that that statute was intended to apply.
Prior to 1962, the statute of limitations governing actions by political subdivisions provided:
The limitations prescribed in this article shall apply to actions brought in the name of any public corporation in the Territory, or for its benefit, in the same manner as to actions by private parties.
Alaska Comp.Laws Ann. § 55-2-12 (1949). Under this provision the appropriate statute of limitations was determined in the same manner as statutes of limitations applicable to private parties — by the nature of the underlying claim. In 1962, the legislature repealed this provision and substituted in its place AS 09.10.120. This 1962 version deletes any reference to actions by private parties, thus substituting an across-the-board six-year statute of limitations for the earlier rule that the limitations period would be determined by the nature of the claim. In our view, the 1962 amendment evinces a legislative intent that a general six-year statute of limitations applies when a borough pursues a claim, regardless of the nature of the claim. Thus, we hold that the six-year statute of limitations applies in this case.13
[1180]*1180IV. INTEREST AND PENALTIES
The final issue before us is whether the Borough may demand interest14 and penalties15 on the tardily-assessed taxes.16 In answering this question, we believe it is necessary to distinguish between real property taxes and personal property taxes.
As to real property the responsibility for assessing taxable parcels and for notifying a taxpayer of his tax liability rests solely with the borough. As we have previously ruled, a tax on real property is ineffective until the borough discharges its responsibilities by making an assessment, notifying the taxpayer of his liability, and providing the taxpayer with an opportunity to pay his taxes.17 Until the borough has exercised its right to demand real property taxes in the manner provided by statute there can be no valid tax and hence no delinquency within the meaning of AS 29.-53.180, which authorizes penalties and interest on delinquent taxes.
As to personal property taxes, however, the taxpayer participates in the taxing process by furnishing the borough with a personal property tax return listing his taxable property.18 When a taxpayer un-derreports his holdings, the borough will have no reason to assess the omitted property until its independent investigation reveals the taxpayer’s omission. This kind of situation is governed by our ruling in Hickel v. Stevenson, 416 P.2d 236, 239 (Alaska 1966), where we held that, for purposes of assessing interest, a taxpayer’s income tax is delinquent on the date that his income should have been reported and his tax paid rather than when the deficiency was later discovered and the additional tax demanded.19
V. CONCLUSION
In sum, we hold that all of the taxes demanded by the Borough are within the relevant statute of limitations and thus Alascom is liable for those taxes. The case is, however, REVERSED IN PART and REMANDED with instructions that interest and penalties paid by Alascom on real property taxes be refunded with interest at the statutory rate.20
CONNOR, J., not participating.