SAWYER, J.
We are asked in these cases to determine the applicability of this Court’s decision in The Gillette Co v Dep’t of Treasury,1 to tax years before the release of that decision in which there was a Revenue Administrative Bulletin (RAB) in place that was favorable to the taxpayer. We hold that defendant may not retroactively apply a court decision favorable to defendant to a tax year before the release of that decision if defendant had in place an interpretive ruling favorable to the taxpayer’s position. We reverse and remand.
Flaintiffs are businesses based outside Michigan whose sole presence in Michigan is a sales force that calls on Michigan businesses. That sales force, which works out of each salesperson’s individual home, encourages the businesses to place orders for plaintiffs’ products at plaintiffs’ out-of-state offices. Those orders [358]*358are then processed and shipped to the Michigan customers from out-of-state locations. It is undisputed that under 15 USC 381, Michigan would be prohibited under federal law from imposing an income tax on plaintiffs’ activities in Michigan. That statute prohibits a state from the collection of a business income tax where the only business activity conducted in that state is the solicitation of orders that are processed out of state. Before the Gillette decision, defendant took the position that the federal statute applied to Michigan’s single business tax (SBT). But, in Gillette, this Court held that the SBT is not an income tax, but a value-added tax (VAT), and that 15 USC 381 is inapplicable to a value-added tax.2
In the cases at bar, defendant assessed SBT liability against plaintiffs not only for the tax years after the Gillette decision, but also for prior years that were still regarded as “open” at the time of the Gillette decision. Plaintiffs raise a number of issues challenging defendant’s position, one of which we find dispositive.
Plaintiffs argue that, because defendant had in place an RAB favorable to plaintiffs position for the tax years before the Gillette decision was released, defendant is bound by that RAB. We agree. Defendant announced in two bulletins that it would apply the federal statute to Michigan’s SBT. First, in Single Business Tax Bulletin (SBTB). 1980-1, defendant stated:
In arriving at sufficient nexus, the Department will use the court cases developed under Public Law 86-272 [15 USC 381] as a guide.
Then in RAB 1989-46, which replaced SBTB 1980-1, defendant stated:
[359]*359In determining whether a taxpayer has sufficient nexus with Michigan, the Department will use the court cases developed under Public Law 86-272 [15 USC 381] as a guide when the business activity involves sales of tangible personal property.
RAB 1989-46 goes on to state:
The following in-state activities will not cause the loss of immunity for otherwise immune sales:
9. Soliciting sales by an in-state resident employee of the taxpayer, provided the employee maintains no in-state sales office or place of business (in-home or otherwise).
Public Law 86-272 provides immunity to certain in-state activities if conducted by an independent contractor that would not be afforded if performed by the taxpayer directly. Independent contractors may engage in the following limited activities in the State without subjecting the outstate taxpayer to single business tax:
1. Soliciting sales
2. Making sales
3. Maintaining a sales office.
Defendant’s position was changed by this Court’s decision in Gillette in a manner not anticipated by either the taxpayer or the tax collector. In Gillette, the petitioner argued that it was exempt from the SBT by virtue of 15 USC 381. The Treasury Department did not argue that the federal law did not apply to the SBT, but, rather, that it applied the federal law to that case and determined that, under the provisions of the federal law, the petitioner was liable for payment of the SBT.3 This Court, noting that the respondent’s brief asserted that the SBT was not an income tax, addressed an issue [360]*360not raised by the parties: whether the federal law applied to the SBT.4 This Court’s conclusion in Gillette was one apparently not advanced by either party: that the federal law exempting certain activity by out-of-state companies from a state income tax does not apply to Michigan’s SBT.
So the question becomes whether plaintiffs in these cases are subject to the SBT for tax years before the release of the Gillette decision or whether plaintiffs may rely on the previous rulings of defendant, which rulings applied the federal law to the SBT. We begin by noting that this Court held that Gillette may be applied retroactively in Syntex Laboratories v Dep’t of Treasury.5 But it did so only in response to a constitutional due process argument by the petitioner. The Syntex decision does not address the issue here, i.e., whether defendant is precluded from applying Gillette retroactively because of its previously published rulings.6
7We agree with plaintiffs that defendant is precluded from applying Gillette retroactively because of those rulings.
The issue whether defendant is bound by its earlier interpretive rulings was addressed in In re D’Amico Estate.7 At issue in D’Amico was whether the provision that lottery winnings were exempt from state and local tax included an inheritance of lottery winnings (i.e., the right to receive future installments) was exempt from the inheritance tax. In D’Amico, the decedent had won a $1 million lottery prize payable over 20 years and died with 14 annual installments still owing. In accordance [361]*361with the defendant’s practice, the inheritance tax examiner did not include the value of those future installments in the calculation of the inheritance tax due. But, the defendant thereafter changed its position regarding the applicability of the inheritance tax to lottery winnings and sought to collect the tax in that case.
Although there is language in the D’Amico decision that suggests that the majority believed that unpaid lottery proceeds were exempt from the inheritance tax on the basis of the applicable statute, ultimately the majority resolved the case on the basis of the previously announced position of the state regarding the issue. Specifically, the Court referred to a letter dated October 5, 1977, from an assistant attorney general to an attorney for an estate, with a copy to the Inheritance Tax Division of the Department of Treasury, stating that lottery winnings are not subject to the inheritance tax.8 The defendant apparently followed that position until September 14, 1983, when it issued a communication to inheritance tax examiners stating that, on the basis of a decision in Macomb County, unpaid lottery winnings should be treated as a transfer of an asset, which would be subject to the inheritance tax.9
The
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SAWYER, J.
We are asked in these cases to determine the applicability of this Court’s decision in The Gillette Co v Dep’t of Treasury,1 to tax years before the release of that decision in which there was a Revenue Administrative Bulletin (RAB) in place that was favorable to the taxpayer. We hold that defendant may not retroactively apply a court decision favorable to defendant to a tax year before the release of that decision if defendant had in place an interpretive ruling favorable to the taxpayer’s position. We reverse and remand.
Flaintiffs are businesses based outside Michigan whose sole presence in Michigan is a sales force that calls on Michigan businesses. That sales force, which works out of each salesperson’s individual home, encourages the businesses to place orders for plaintiffs’ products at plaintiffs’ out-of-state offices. Those orders [358]*358are then processed and shipped to the Michigan customers from out-of-state locations. It is undisputed that under 15 USC 381, Michigan would be prohibited under federal law from imposing an income tax on plaintiffs’ activities in Michigan. That statute prohibits a state from the collection of a business income tax where the only business activity conducted in that state is the solicitation of orders that are processed out of state. Before the Gillette decision, defendant took the position that the federal statute applied to Michigan’s single business tax (SBT). But, in Gillette, this Court held that the SBT is not an income tax, but a value-added tax (VAT), and that 15 USC 381 is inapplicable to a value-added tax.2
In the cases at bar, defendant assessed SBT liability against plaintiffs not only for the tax years after the Gillette decision, but also for prior years that were still regarded as “open” at the time of the Gillette decision. Plaintiffs raise a number of issues challenging defendant’s position, one of which we find dispositive.
Plaintiffs argue that, because defendant had in place an RAB favorable to plaintiffs position for the tax years before the Gillette decision was released, defendant is bound by that RAB. We agree. Defendant announced in two bulletins that it would apply the federal statute to Michigan’s SBT. First, in Single Business Tax Bulletin (SBTB). 1980-1, defendant stated:
In arriving at sufficient nexus, the Department will use the court cases developed under Public Law 86-272 [15 USC 381] as a guide.
Then in RAB 1989-46, which replaced SBTB 1980-1, defendant stated:
[359]*359In determining whether a taxpayer has sufficient nexus with Michigan, the Department will use the court cases developed under Public Law 86-272 [15 USC 381] as a guide when the business activity involves sales of tangible personal property.
RAB 1989-46 goes on to state:
The following in-state activities will not cause the loss of immunity for otherwise immune sales:
9. Soliciting sales by an in-state resident employee of the taxpayer, provided the employee maintains no in-state sales office or place of business (in-home or otherwise).
Public Law 86-272 provides immunity to certain in-state activities if conducted by an independent contractor that would not be afforded if performed by the taxpayer directly. Independent contractors may engage in the following limited activities in the State without subjecting the outstate taxpayer to single business tax:
1. Soliciting sales
2. Making sales
3. Maintaining a sales office.
Defendant’s position was changed by this Court’s decision in Gillette in a manner not anticipated by either the taxpayer or the tax collector. In Gillette, the petitioner argued that it was exempt from the SBT by virtue of 15 USC 381. The Treasury Department did not argue that the federal law did not apply to the SBT, but, rather, that it applied the federal law to that case and determined that, under the provisions of the federal law, the petitioner was liable for payment of the SBT.3 This Court, noting that the respondent’s brief asserted that the SBT was not an income tax, addressed an issue [360]*360not raised by the parties: whether the federal law applied to the SBT.4 This Court’s conclusion in Gillette was one apparently not advanced by either party: that the federal law exempting certain activity by out-of-state companies from a state income tax does not apply to Michigan’s SBT.
So the question becomes whether plaintiffs in these cases are subject to the SBT for tax years before the release of the Gillette decision or whether plaintiffs may rely on the previous rulings of defendant, which rulings applied the federal law to the SBT. We begin by noting that this Court held that Gillette may be applied retroactively in Syntex Laboratories v Dep’t of Treasury.5 But it did so only in response to a constitutional due process argument by the petitioner. The Syntex decision does not address the issue here, i.e., whether defendant is precluded from applying Gillette retroactively because of its previously published rulings.6
7We agree with plaintiffs that defendant is precluded from applying Gillette retroactively because of those rulings.
The issue whether defendant is bound by its earlier interpretive rulings was addressed in In re D’Amico Estate.7 At issue in D’Amico was whether the provision that lottery winnings were exempt from state and local tax included an inheritance of lottery winnings (i.e., the right to receive future installments) was exempt from the inheritance tax. In D’Amico, the decedent had won a $1 million lottery prize payable over 20 years and died with 14 annual installments still owing. In accordance [361]*361with the defendant’s practice, the inheritance tax examiner did not include the value of those future installments in the calculation of the inheritance tax due. But, the defendant thereafter changed its position regarding the applicability of the inheritance tax to lottery winnings and sought to collect the tax in that case.
Although there is language in the D’Amico decision that suggests that the majority believed that unpaid lottery proceeds were exempt from the inheritance tax on the basis of the applicable statute, ultimately the majority resolved the case on the basis of the previously announced position of the state regarding the issue. Specifically, the Court referred to a letter dated October 5, 1977, from an assistant attorney general to an attorney for an estate, with a copy to the Inheritance Tax Division of the Department of Treasury, stating that lottery winnings are not subject to the inheritance tax.8 The defendant apparently followed that position until September 14, 1983, when it issued a communication to inheritance tax examiners stating that, on the basis of a decision in Macomb County, unpaid lottery winnings should be treated as a transfer of an asset, which would be subject to the inheritance tax.9
The D’Amico Court10 made the following observation:
For over a decade, the department construed § 34 of the Lottery Act [MCL 432.34] as exempting state lottery prize proceeds from inheritance taxation. Persons who bought lottery tickets during the regime when the department and field examiners were administering the inheritance tax law [362]*362as exempting lottery proceeds from inheritance tax should be accorded the benefit of the first, contemporaneous construction of the law:
“It has been held that an administrative agency having interpretive authority may reverse its interpretation of a statute, but that its new interpretation applies only prospectively.”
The D’Amico opinion concluded:11
The Department of Treasury should be held to be bound by the first, contemporaneous construction by the state, at least with regard to the estates of persons who purchased lottery tickets before September 14,1983, when the department advised inheritance tax field examiners of a “new development.”
On the basis of the principles set forth in D’Amico, we conclude that defendant is bound by the position stated in its earlier RAB and cannot apply a different position to the detriment of a taxpayer for activity before March 1,1993, the date of the release of this Court’s opinion in Gillette.
Defendant attempts to distinguish D’Amico on the basis that in D’Amico the defendant had voluntarily changed its position on the interpretation of the law while in Gillette the change of position was imposed by this Court in its decision. Defendant relies upon an unpublished decision of this Court that held that D’Amico does not apply to the Gillette line of cases because in D’Amico defendant changed its position and then litigated the change, while in Gillette the change was forced upon defendant by this Court.12 We are not bound by unpublished decisions of this Court13 and choose not to follow that decision because it was incorrectly decided.
[363]*363Nothing in the rationale of D’Amico would support a distinction between cases where defendant chooses first to change its position and those where the change is prompted by a court decision. Indeed, the rationale behind binding defendant to its interpretive positions is that taxpayers reasonably rely upon those interpretations.14 A taxpayer will have made any number of decisions based upon its view of the tax laws, such as the determination of profits and whether to reinvest those profits or pay dividends on, its pricing structure, how it reports income on tax returns in other jurisdictions, and, potentially, even whether to do business in this state. While a taxpayer’s interpretation of tax law is always subject to a determination that that interpretation is incorrect, D’Amico recognizes that a taxpayer should be able to proceed in reasonable reliance on defendant’s official positions. And a taxpayer’s reliance does not differ in situations where defendant voluntarily changes its interpretation of a statute or where that change is thrust upon the department by a court decision. Therefore, there is no legitimate basis on which to distinguish between the two situations in determining whether defendant should be bound by its earlier interpretation.
We do note that Gillette represents what must be a relatively unusual circumstance: a court rejecting a position of defendant that favors a taxpayer and imposing an interpretation that is less favorable to the taxpayer than even that advocated by defendant. That is, when a court decision forces defendant to change its position, that decision is most likely in the favor of the taxpayer, not defendant. While this unanticipated windfall to defendant provides a reasonable explanation why it did not place taxpayers on notice that it was changing [364]*364its interpretation, that does not change the taxpayers’ reliance on defendant’s interpretation. Indeed, if anything, the taxpayer’s reliance is greater in these cases because there would be no basis for even anticipating that defendant would obtain a court decision less favorable .to the taxpayer than the position it advocated because defendant would not even be seen as seeking such a decision.
We also note that this question was considered by this Court in a published opinion released after the parties filed their briefs in the case at bar. Our decision in Rayovac Corp v Dep’t of Treasury15 addresses many of the arguments raised by plaintiffs in these cases, such as violation of the Commerce Clause, the binding nature of guidelines under the Administrative Procedures Act, an unconstitutional “bait and switch,” a claim of unfair and unjust treatment, and the application of the doctrine of laches. Thus, while Rayovac considered the argument whether defendant is bound by those earlier revenue rulings under various theories advanced by plaintiffs, it did not specifically consider the applicability of D’Amico. Accordingly, we do not view Rayovac as being dispositive on this point.
For these reasons, we hold that defendant may not apply a position less favorable to plaintiffs than that contained in its previous rulings for activity occurring before the release of this Court’s decision in Gillette. In light of our decision on this issue, we need not address the remaining issues raised by plaintiffs.
Reversed and remanded for further proceedings consistent with this opinion. We do not retain jurisdiction. Plaintiffs may tax costs.
[365]*365Wilder, J., concurred.