This appeal is from an order of the Tax Division of the Superior Court which held that the court reporting services of appel-lee, Acme Reporting Company (Acme), were improperly taxed by appellant, the District of Columbia (the District).1 The court ordered the refund to Acme of $45,-692.47 plus interest, which amount the court found had been improperly assessed and collected by the District. We affirm.
I
The pertinent facts which, for the most part are undisputed, may be summarized as follows. After an audit of Acme and other companies providing court reporting services, the District, on July 1, 1988, assessed Acme for sales and use tax deficiencies in the amount of $47,454.60. The tax authorities determined that the monies received by Acme for its court reporting services were subject to District sales and use taxes.2 Acme paid the taxes assessed and filed a timely petition in the Tax Division seeking cancellation of the assessment and a refund of the amount paid plus interest.3
The matter came before the Tax Division on cross-motions for summary judgment, which were denied. After a trial on March 25, 1985, the court ruled that court reporting services are not “public stenographic” services for purposes of D.C. Code §§ 47-2001 (n)(l)(H) and 47-2201(a)(l)(G) (1981). The court then ordered that the District modify its records to reflect a tax exempt status; that the tax assessment be can-celled and that the taxes paid, including any penalties and interest, be refunded to Acme.4
Acme, presently a Delaware corporation, was, during the tax periods in question, a Maryland Corporation engaged in the business of providing court reporting services in Maryland and the District of Columbia. Acme is, or has been, the official court reporter for the Civil Aeronautics Board, the National Labor Relations Board, the Securities and Exchange Commission, the Department of Defense, the Department of Labor, the U.S. House of Representatives, the U.S. Senate, the U.S. Claims Court and the U.S. Tax Court. The majority of its court reporting services are provided pursuant to contracts with the federal government. Acme does no court reporting for either the Superior Court of the District of Columbia or this court.
The services provided by Acme’s court reporters include attendance at and the recording and transcription of legal proceed*710ings such as judicial trials and hearings before administrative agencies. Each reporter is responsible for producing an accurate and full recording of the legal proceeding attended so as to protect the tribunal and parties by a complete record. Acting as an official of the court or administrative tribunal, the reporters administer oaths to witnesses, bear responsibility for all exhibits, and testify as to the accuracy of the record.
The final product of Acme’s court reporting services is a verbatim transcript of the proceeding Acme was engaged to report. All prepared transcripts are furnished to either the court or government agency holding the proceeding or to the parties to the proceeding. A certain amount of tangible personal property, such as paper binding and covers, is used by Acme to produce transcripts of the reported proceedings. The cost of these items constitutes less than four percent of the amount Acme charges its customers for court reporting services and no separate charge is made to customers for such materials.
When Acme commenced business operations in the District of Columbia, it sought tax advice from its accounting firm respecting the applicability of the District’s sales and use taxes to its court reporting services. The accounting firm advised, by letter, that the services involved in recording testimony and printing it for customers were not subject to the District’s sales and use taxes and that additional sales of copies of resulting documents to an “interested party” to the proceeding were not subject to the taxes.
Subsequently, Acme received from its accounting firm a copy of a memorandum prepared by Mr. Arnold M. Malech, then the Executive Officer of the District of Columbia courts, addressed to court reporters employed by the District of Columbia courts. This memorandum provided guidance concerning the applicability of the District’s sales and use taxes to the sales of transcripts prepared by court reporters employed by the District of Columbia courts. The memorandum concluded that the District’s sales and use taxes did not apply to sales of transcripts by court reporters of the District of Columbia courts except when purchased by a non-party to the proceeding being recorded, such as a newspaper reporter. The memorandum directed questions to James Andy, an employee of the Department of Finance and Revenue (the Department). Relying on the opinion of its accounting firm and the memorandum from Mr. Malech, Acme determined that the District’s sales and use taxes did not apply to monies received for its court reporting services.
In November of 1969, the Department sent a notice to all registered sales and use taxpayers concerning the 1969 amendments imposing sales and use taxes on public stenographic services. This notice, however, did not define the term “public stenographic services.” When the Department promulgated a regulation to define the term “public stenographic services,” the regulation simply stated that “the term public stenographic services includes typing services.” 9 DCMR § 468.3 (1986).
However, Mr. Edward M. Many, Manager of the Tax Audit and Liability Division of the District of Columbia Department of Finance and Revenue, testified at trial that the Department has always taken the position that the term "public stenographic services” includes court reporting services, but did not specifically refer to any written or oral interpretation by the Department which included court reporters within the term “public stenographies services.”
In 1981, when the Department initiated sales and use tax audits of law firms, it observed that the firms were not being charged sales or use tax on amounts paid for court reporting services. The Department then conducted audits of several companies engaged in the business of providing court reporting services.5
*711Acme first learned that the Department interpreted the term “public stenographic services” to include court reporting services during the Department’s sales and use tax audit of Acme in 1982. Acme immediately began collecting sales and use taxes on receipts from its court reporting services, including the sales of transcripts. As a result of the audit, the District sent the notice dated July 1, 1983, which assessed the tax deficiencies contested in this appeal.
II
Initially, a brief review of the tax scheme in effect throughout the period of the deficiency assessment (December 1, 1979 through November 30, 1982) is necessary. The Gross Sales Tax and the Compensating-Use Tax laws of the District are substantially similar in relation to the issues we address today. Under D.C. Code § 47-2002 (1981), a sales tax is imposed on the retail sale of “certain selected services (defined as ‘retail sale’ and ‘sale at retail’ in this chapter).” See also D.C. Code § 47-2202 (1981) (similar use tax provision on “service sold or purchased at retail sale”). D.C. Code § 47-2001(n)(l)(H) (1981) includes within the definition of “retail sale” and “sale at retail”
the sale ... of any tangible personal property or service taxable under the terms of this chapter.... For the purpose of the tax imposed by this chapter, these terms shall include but shall not be limited to ... the sale of or charges for ... public stenographic services[.]
See also D.C. Code § 47-2201(a)(l)(G) (1981) (identical use tax provision). Thus, it is clear that “public stenographic services” are taxable under the Code.
However, exempt from the definition of “retail sale” or “sale at retail,” and therefore not taxable under § 47-2001(n)(2)(B) or § 47-2201(a)(2)(B) are professional or personal service transactions which involve sales as inconsequential elements for which no separate charges are made. Acme argues that its court reporting services are exempt from sales and use taxation pursuant to § 47-2001(n)(2)(B) and § 47-2201(a)(2)(B) as “personal services transactions.” The District counters that since Acme provides “public stenographic services,” its sales are taxable under § 47-2001(n)(l)(H) and § 47-2201(a)(l)(G).
Ill
The District’s principal argument on appeal is that the tax court erred in ruling that Acme’s court reporting services do not fall within the meaning attributed to “public stenographic services” in D.C. Code §§ 47-2001 and 47-2201. The District maintains that the term is not ambiguous and that Acme’s activities clearly fall within the plain meaning of the statutory provisions in dispute. Moreover, the District argues that its interpretation of the phrase is a long-standing one to which substantial deference must be paid.
Acme, however, counters that its court reporting services cannot be equated with “public stenographic services” within the meaning of the statutes. An application of the rules of statutory construction, Acme contends, compels the conclusion that the term does not encompass court reporting services. Moreover, Acme complains that it has never been put on notice, either through clear statutory language, or otherwise, of the necessity to collect the contested taxes. Finally, Acme asserts that, because it has never had reason to be aware of the District’s ostensible statutory interpretation, any claimed long-standing administrative interpretation by the District should be accorded little, if any, weight.
We begin our analysis of the issue presented by recognizing that the scope of *712our review is controlled by D.C. Code § 47-3304(a) (1981). “Decisions of the Superior Court in civil tax cases are reviewable in the same manner as other decisions of the court in civil cases tried without a jury.” Id.; see also D.C. Code § 17-305(a) (1981). This means we will not set aside the tax court’s judgment, except for errors of law. See Riggs v. Aetna Insurance Co., 454 A.2d 818, 820 (D.C. 1983). We must accept the court’s findings of fact unless they are clearly erroneous, see District of Columbia v. Washington Sheraton Corp., 499 A.2d 109, 111 (D.C. 1985); Rock Creek Plaza-Woodner Ltd. Partnership v. District of Columbia, 466 A.2d 857, 859 (D.C. 1983), and we will not upset the ultimate legal conclusion of the tax court when its outcome necessarily follows from its findings of fact by which we are bound, District of Columbia v. National Bank of Washington, 431 A.2d 1, 3 (D.C. 1981). However, “[rjegard for the special function and competence of the Tax Court does not warrant avoiding our responsibility of reaching a decision of our own as to the application of the law to the facts.” District of Columbia v. Seven-Up Washington, Inc., 93 U.S. App. D.C. 272, 275, 214 F.2d 197, 200, cert. denied, 347 U.S. 989, 74 S.Ct. 851, 98 L.Ed. 1123 (1954). As always, we are free to sustain the trial court judgments on grounds different from those on which the trial court relied. See Jones v. District of Columbia, 123 A.2d 364, 365 (D.C. 1956). Applying the above guidelines to the case at hand, we conclude that the tax court’s decision does not warrant reversal as the proper result was reached, although, as we will explain, we affirm, as a matter of law, on a basis not adopted by the tax court. See Marinopoliski v. Irish, 445 A.2d 339, 340 (D.C. 1982).
IV
The task before us today is to determine, as a statutory matter of law, what Congress intended by its use of the term “public stenographic services” in the District’s sales and use tax provisions. In other words, did Congress intend to include local and federal D.C. court system reporters and Acme’s court reporters in its definition of public stenographic services? At the onset, we stress that there is no rational basis on which to distinguish Acme’s court reporters from the court system’s reporters in application of the term “public stenographic services” contained in the relevant tax provisions. The wording of the relevant tax code sections requires that sale of transcripts to interested parties by Acme must be treated in a manner identical to the fashion in which sales by local and federal D.C. court system reporters are treated.
In resolving this issue, we focus on the “settled rule that tax laws are to be strictly construed against the state and in favor of the taxpayer,” if the statute in controversy is unclear and ambiguous. 3A Sutherland, Statutes and Statutory Construction § 66.01 (C. Sands, 4th ed. 1986); see also Gould v. Gould, 245 U.S. 151, 153, 38 S.Ct. 53, 62 L.Ed. 211 (1917). At the same time, we are mindful of the maxim that “tax laws ought to be given a reasonable construction, without bias or prejudice against either the taxpayer or the state, in order to carry out the intention of the legislature and further the important public interests which such statutes subserve.” 3A Sutherland, supra at § 66.02 (quoting State v. Brandt, 255 Minn. 345, 31 N.W.2d 5 (1948)). Further, “[sjince the obligation to pay taxes arises only by force of legislative action, the nature and extent of that liability is determined by the legislative meaning. Therefore, all the rules of statutory construction are relevant in the interpretation of revenue measures.” 3A Sutherland, supra at § 66.03.
In construing acts of Congress, “we must look first to the language of the statute and, if it is clear and unambiguous, give effect to its plain meaning.” Office of People’s Counsel v. Public Service Commission, 477 A.2d 1079, 1083 (D.C.1984). Our reading of §§ 47-2001(n)(1)(H) and 47-2201(a)(1)(G) does not leave us with a clear and unambiguous understanding of the phrase “public stenographic services,” so as to persuade us to conclude that the plain meaning of the term necessitates inclusion of all court reporters in the District. Nei*713ther the statute itself, nor its implementing regulation, which simply states that the term includes typing services, 9 DCMR § 468.3 (1986), assist in ascertaining the plain meaning of the term “public stenographic services.”
Having determined that we are considering a statutory term that on its face is ambiguous and unclear, we turn next to an examination of the legislative history surrounding the enactment of the statutes in question for assistance. See Office of People’s Counsel v. Public Service Commission, supra, 477 A.2d at 1085. The sales and use tax provisions making “public stenographic services” taxable were enacted by Congress within the District of Columbia Revenue Act of 1969. The District proposed to Congress that the sales and use tax base be expanded to increase revenues. One specific proposal was to extend the sales and use tax to include taxation of “stenographic services.” See Proposals of the District of Columbia Government to Provide Additional Revenue for the District of Columbia: Hearing on H.R. 12982 Before the Committee on the District of Columbia, 91st Cong., 1st Sess. 10-12 (1969) (statement of Thomas Fletcher, Assistant to the Commissioner). This proposal was based on the August 30,1968, study of the District’s financial advisor, Laszlo Ecker-Rancz, who recommended that if the sales and use taxes were broadened to apply to personal, business, automobile, contractor and repair services, the District could readily increase its tax revenues by as much as twenty percent. The report specified that the services embraced by the enumerated categories include business services: advertising, duplicating, stenographic, exterminating, services to building, telephone answering, etc. Id.
We find of particular significance the facts that Congress (1) chose to qualify the term as proposed, “stenographic services,” by adding to the phrase the word “public,” and (2) chose to include the phrase within the paragraph which reads, as adopted, “The sale of or charges for copying, photocopying, reproducing, duplicating, addressing, and mailing services and for public stenographic services.” D.C.Code §§ 47-2001(n)(l)(H) and 47-2201(a)(l)(G). We also note that H.R.Rep. No. 463, 91st Cong., 1st Sess. 13 (1969) provides that the imposition of the proposed sales tax would include “[c]harges for duplicating, addressing, and mailing services, including folding and inserting of the materials mailed, and for public stenographic services. A great deal of this type of service is performed in the District, by a number of commercial firms.”
We are persuaded that to include court reporters within the term “public stenographic services” is inconsistent with the legislative history, albeit scant, of the District’s sales and use tax measures as enacted by Congress. The addition, by Congress, of the word “public” must be acknowledged and accorded some measure of significance. It is a basic axiom of construction that effect must be given every word of a statute and interpretations that operate to render a word inoperative should be avoided. See 2A SUTHERLAND, supra at § 46.06. “A statute should not be construed in such a way as to render certain provisions superfluous or insignificant.” Tuten v. United States, 440 A.2d 1008, 1010 (D.C.1982). Thus, because Congress must have intended the addition of the word “public” to have some significance,6 we reject the District’s proposed *714definition of the term “public stenographic services” as it renders the word “public” meaningless and superfluous.7
Additionally, as we indicated previously, the provisions at issue impose sales and use taxes on the sale of or charges for copying, photocopying, reproducing, duplicating, addressing and mailing services, as well as “public stenographic services.” D.C.Code §§ 47-2001(n)(l)(H) and 47-2201(a)(1)(G). When the sections are read as a whole, it is apparent that the other services taxed, such as copying, addressing and mailing, etc., are ones generally associated with stenographic services and not court reporting services. See Dictionary of Occupational Titles, supra at §§ 202.-362-014 and 202.362-010. A statute, passed as a whole, should be construed as a whole, and the meaning to be attached to a particular term is to be ascribed from the context of the surrounding words and phrases. See 2A SUTHERLAND, supra, at § 46.05.
We are also mindful of the rule that in determining the true construction of a specific statutory phrase one must consider
the connection of the clause with other clauses in the same statute, and the con-elusions which on comparison with other clauses, may reasonably and obviously be drawn.... If the comparison of one clause with the rest of the statute makes a certain proposition clear and undoubted the act must be construed accordingly and ought to be so construed to make it a consistent whole.
2A Sutherland, supra, at § 46.06 (quoting Attorney General v. Sillem, 159 Eng.Rptr. 178 (1864)).
Application of this rule to the task at hand results in further support for our resolution today. Section 47-2001(n)(2)(B) of the Gross Sales Tax Statute and § 47-2001(a)(2)(B) of the Compensating Use Tax Statute provide that unless specifically enumerated by statute, professional and personal service transactions involving sales of tangible personal property as inconsequential elements for which no separate charges are made, are specifically exempt from the sales and use taxes. Acme’s court reporting services satisfy all of the requirements for exemption. This determination follows from the fact that Acme’s services (1) are personal or professional services,8 (2) involve the sale of inconse*715quential amounts of tangible personal property for which no separate charge is made,9 and (3) are not specifically enumerated as a taxable service. Thus, because exempt under §§ 47-2001(n)(2)(B) and 47-2201(a)(2)(B), Congress could not have intended to tax Acme’s court reporting services under §§ 47-2001(n)(l)(H) and 47-2201(a)(1)(G).
Crucial to our determination today is the rule, stated earlier, that “tax laws ought to be given a reasonable construction ... in order to carry out the intention of the legislature and further the important public interests which such statutes subserve.” 3A SUTHERLAND, supra at § 66.02 (quoting State v. Brandt, 225 Minn. 345, 31 N.W.2d 5 (1948)). In this jurisdiction, “reasonableness of a construction can often be tested by considering the consequences of a different one.” District of Columbia v. Seven-Up Washington, supra, 93 U.S.App. D.C. at 276, 214 F.2d at 201. If we were to hold that, as the District urges, Congress intended the term “public stenographic services” to include the sales of transcripts by Acme’s court reporters to interested parties, it would by necessity follow that the sales of transcripts to interested parties by all court reporters in the District, including the local and federal court systems, would likewise be subject to the sales and use tax.10 This would have a chilling effect on judicial proceedings within the District— not only in the future, but retroactively.11
*716And finally, our determination today is further reinforced by the fact that we do not necessarily have the final word on the issue. Today’s holding, although issued by the highest court of this jurisdiction, does not escape review. In the words of Justice Blackmun, “if the Court has misperceived the political will, it has the assurance that because the question is statutory [the legislature] may set a different course if it so chooses.” United Steel Workers of America v. Weber, 443 U.S. 193, 216, 99 S.Ct. 2721, 2734, 61 L.Ed.2d 480 (1979).12
Affirmed.