OPINION
ROTH, Circuit Judge:
This case, grounded in the principles of administrative law, requires that we review the validity of an Internal Revenue Service (IRS) regulation. The Tax Court, in considering this regulation, analyzed it under the factors provided in
National Muffler Dealers Ass’n v. United States,
440 U.S. 472, 477, 99 S.Ct. 1304, 59 L.Ed.2d 519 (1979), and concluded that the regulation was invalid. In coming to this conclusion, the Tax Court explained that the standard established in
National Muffler
had not been replaced by
Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc.,
467 U.S. 837, 104 S.Ct. 2778, 81 L.Ed.2d 694 (1984), and that the result under either standard would be the same. We do not agree with the outcome reached by the Tax Court. We have determined that the result would not be the same under
Chevron
analysis as it would be under
National Muffler
and that the regulation here should be given
Chevron
deference.
I.
Factual and Procedural Background
The IRS has appealed a United States Tax Court decision that held Treas. Reg. 1.882 — 4(a)(3)(i) to be invalid. Petitioner-appellee Swallows Holdings, Ltd. (Taxpayer) is a Barbados corporation with two principal shareholders, Raimundo Arnaiz-Rosas and Aurora Elsa Arnaiz. On September 14, 1992, Taxpayer filed its first federal income tax return. In its return, Taxpayer reported that it held real property in San Diego, California. Between 1993 and 1996, Taxpayer generated rental income from the San Diego property.
It was not until 1999, however, that Taxpayer filed returns for tax years 1993, 1994, 1995 and 1996.
A foreign corporation, engaging in trade or business in the United States, is taxed on its taxable income that is connected with the conduct of that trade or business. 26 U.S.C. § 882(a). Deductions from income are allowed only if they are connected with the “income which is effectively connected with the conduct of a trade or business within the United States.” Section 882(c)(1)(a). However, foreign corporations that do not engage in a trade or business in the United States are taxed at a flat rate of thirty percent of any amount received from sources within the United States. Section 881(a). The Internal Revenue Code, generally speaking, does not allow these foreign corporations to claim deductions. Section 882(c)(2). Nevertheless, if a foreign corporation conducts real property activity in the United States, the foreign corporation can treat the income derived from the real property activity as income from a “trade or business,” thus qualifying the foreign corporation to claim tax deductions (e.g., interest and taxes) that are otherwise unavailable. Section 882(d)(1).
The dispute in this case arises from the filing deadlines set forth in Treas. Reg. 1.882 — 4(a)(3)(i),
which the Secretary of the Treasury promulgated to supplement section 882(c)(2). The regulation requires that a foreign corporation file a return within eighteen months of the filing deadline set in section 6072 in order to claim the real property activity tax deductions. Here, Taxpayer filed the tax returns in question well after the expiration of the eighteen-month filing period. The Commissioner assessed tax deficiencies accordingly.
Taxpayer challenged the Commissioner’s findings in the United States Tax Court, arguing that Treas. Reg. 1.882-4(a)(3)© was an invalid exercise of the Secretary’s rule-making authority.
See Swallows Holding, Ltd. v. C.I.R.,
126 T.C. 96 (2006). The Tax Court granted judgment in favor of Taxpayer, focusing its inquiry on the plain meaning of I.R.C. § 882(c)(2). Specifically, the court held that section 882(c)(2) requires that foreign corporations file “in the manner prescribed by subtitle
F....” Id.
at 107. The Tax Court’s interpretation of the statute cen
tered on the meaning of the word “manner” in the absence of any explicit textual reference to “time.” The court found it persuasive that Congress did not draft the statute with the familiar phrase “time and manner.” The court noted that Congress placed “time” and “manner” together in several Code sections, indicating that when Congress intended a time limit to apply, it did so with the phrase “time and manner.” Because the court found that the plain meaning of “manner” did not inherently include an element of time, the court concluded that Congress did not intend section 882(c)(2) to embody a filing deadline.
Id.
at 134-46. The court found that the meaning of the statutory text was plain and unambiguous.
Id.
at 135. The court nonetheless continued its analysis and held that the Secretary’s interpretation of the statute to include a timely filing requirement in the language of Treas. Reg. 1.882-4(a)(3)® was unreasonable. 126 T.C. at 137.
Relying on its earlier opinion in
Central Pa. Sav. Association & Subs. v. Commissioner,
104 T.C. 384, 392 (1995), the Tax Court determined that the standard established in
National Muffler
had not been replaced by
Chevron
and that the result under either standard would be the same.
Id.
at 131. The court concluded that a consideration of the
National Muffler
factors demonstrated the unreasonableness of the Secretary’s interpretation of section 882(e)(2) to include the timely filing requirement.
Id.
at 137. The Tax Court listed the six factors set out in
National Muffler
to consider in assessing the reasonableness of the agency action. The Tax Court described these factors as follows:
(1) whether the regulation is a substantially contemporaneous construction of the statute by those presumed to have been aware of congressional intent; (2) the manner in which a regulation dating from a later period evolved; (3) the length of time that the regulation has been in effect; (4) the reliance placed upon the regulation; (5) the consistency of the Secretary’s interpretations; and (6) the degree of scrutiny Congress has devoted to the regulation during subsequent reenactments of this statute.
Id.
at 137 (citing
National Muffler,
440 U.S. at 477, 99 S.Ct. 1304).
The Tax Court found that the Secretary’s action failed to meet several of the
National Muffler
factors: the regulation was not a substantially contemporaneous construction of the statute; the regulation evolved after the Fourth Circuit Court of Appeals and the Board of Tax Appeals had repeatedly and consistently held that the statute did not include a timely filing requirement;
the regulations were issued after multiple reenactments of the statutory text; the Secretary’s statement accompanying the issuance of the regulations flew in the face of the prior court holdings and was a departure from the Secretary’s previous interpretation of the 1957 regulations; and the statute had been reenacted several times without change to the governing statutory language.
Id.
at 137-38. As a result, the court held that the regulation was an unreasonable exercise of the Secretary’s statutory power. Thus, the Tax Court ruled in favor of Taxpayer, holding that I.R.C. § 882(c)(2) did not include a filing deadline and that Taxpayer was entitled to the rental activity deductions. The IRS appealed.
II.
Discussion
A. Jurisdiction
We have jurisdiction to review the final judgment of the Tax Court pursuant to I.R.C. § 7482(a)(1);
see also New York Football Giants, Inc. v. C.I.R.,
349 F.3d 102, 105-06 (3d Cir.2003). We exercise plenary review over the Tax Court’s legal conclusions but will only set aside factual findings that are clearly erroneous.
Capital Blue Cross v. C.I.R.,
431 F.3d 117, 123-24 (3d Cir.2005).
B. Applicability of
Chevron
The crucial issue before us is whether the Tax Court erred in applying
National Muffler
rather than
Chevron
when evaluating the validity of Treas. Reg. 1.882-4(a)(3)(i). We hold that the Tax Court erred in applying
National Muffler
to the extent that the
National Muffler
factors are inconsistent with
Chevron
analysis.
In
Chevron,
the Supreme Court reasoned that the judiciary was to afford an agency discretion to interpret ambiguous provisions of the agency’s organic or enabling statute. In what has become familiar administrative law parlance, the
Chevron
Court set forth a two step analysis:
When a court reviews an agency’s construction of the statute which it administers, it is confronted with two questions. First, always, is the question whether Congress has directly spoken to the precise question at issue. If the intent of Congress is clear, that is the end of the matter; for the court, as well as the agency must give effect to the unambiguously expressed intent of Congress
[Chevron
Step one]. If, however, the court determines Congress has not directly addressed the precise question at issue, the court does not simply impose its own construction of the statute, as would be necessary in the absence of an administrative interpretation. Rather, if the statute is silent or ambiguous with respect to the specific issue, the question for the court is whether the agency’s answer is based on a permissible construction of the statute
[Chevron
Step two].
Chevron,
467 U.S. at 842-43, 104 S.Ct. 2778. Courts, including the Supreme Court, have operated under this general framework
post-Chevron. See, e.g., Nat’l Cable & Telecomm. Ass’n. v. Brand X Internet Serv.,
545 U.S. 967, 980-81, 125 S.Ct. 2688, 162 L.Ed.2d 820 (2005);
United States v. Mead Corp.,
533 U.S. 218, 226, 121 S.Ct. 2164, 150 L.Ed.2d 292 (2001);
Woodall v. Fed. Bureau of Prisons,
432 F.3d 235, 248-49 (3d Cir.2005);
George Harms Const. Co. v. Chao,
371 F.3d 156, 161 (3d Cir.2004);
Robert Wood Johnson Univ. Hosp. v. Thompson,
297 F.3d 273, 281-82 (3d Cir.2002). In accordance with this precedent, we will proceed to determine if this case should be reviewed under
Chevron.
Our inquiry would be a simple one if, as the Tax Court suggested, the result of this case would be the same regardless of which standard we apply. This, however, is not the case. The Tax Court relied heavily on factors that, although relevant to the
National Muffler
standard, are not mandatory or dispositive inquiries under
Chevron.
As we set out above, the Tax Court reasoned that the challenged regulation was not a contemporaneous construction of the statute; the Tax Court found that the Fourth Circuit Court of Appeals and the Board of Tax Appeals had interpreted the statute as not including a timing element, and the Tax Court relied on the existence of several reenactments of the statute without any change to the gov
erning statutory language.
Even if we were to assume that all of these observations are true, conclusive reliance on them is misplaced. When
Chevron
deference is owed,
Chevron's,
demands are clear. If the statutory text is ambiguous, an agency is given the discretion to promulgate rules that interpret the ambiguous provisions. Judicial deference to an agency’s rule-making authority ends only when the agency’s construction of its statute is unreasonable. Accordingly, we now consider whether
Chevron
deference is appropriate here.
C.
Chevron
Analysis
We note that
Chevron
deference will not be extended to all agency action.
Mead,
533 U.S. at 229-31, 121 S.Ct. 2164.
Mead
teaches that
Chevron
deference is appropriate only in situations where “Congress would expect the agency to be able to speak with the
force of
law....”
Id.
at 229, 121 S.Ct. 2164 (emphasis added). When Congress does not intend a particular agency action to wield the force of law,
Skidmore
deference may be appropriate.
Thus,
Mead
requires that we assess the legal effect of Treas. Reg. 1.882 — 4(a)(3)(i), which was promulgated under I.R.C. § 7805. Section 7805, which is a general grant of power to the Secretary, provides:
Except where such authority is given by this title to any person other than an officer or employee of the Treasury Department, the Secretary shall prescribe all needful rules and regulations for the enforcement of this title, including all rules and regulations as may be necessary by reason of any alteration of law in relation to internal revenue.
We note first that the deference owed to regulations issued under I.R.C. § 7805(a) has been described over the years in different ways. In
National Muffler,
of course, the Supreme Court listed factors such as whether the regulation was con
temporaneous with the statute, the age of the regulation, and the consistency of its interpretation. 440 U.S. at 477, 99 S.Ct. 1304. More recently, however, in
United States v. Cleveland Indians Baseball Co.,
532 U.S. 200, 219, 121 S.Ct. 1433, 149 L.Ed.2d 401 (2001), the Court remarked that “we defer to the Commissioner’s regulations as long as they ‘implement the congressional mandate in some reasonable manner.’”
Id.
at 219, 121 S.Ct. 1433 (quoting
United States v. Correll,
389 U.S. 299, 306-07, 88 S.Ct. 445, 19 L.Ed.2d 537 (1967)).
In
Armstrong World Inds., Inc. v. Comm’r,
974 F.2d 422, 430 (3d Cir.1992), this Court considered the validity of a regulation issued under section 7805(a). We cited to
Chevron,
467 U.S. at 842-44, 104 S.Ct. 2778, to support the need to determine if “ ‘Congress has directly spoken to the precise question at issue,’ and if the intent of Congress is unambiguously expressed, we must give that intent effect.”
Id.
at 430 (quoting
Chevron,
467 U.S. at 843, 104 S.Ct. 2778). Again quoting
Chevron,
we went on to state that “[i]f the question has not been directly addressed, we then look to whether ‘the agency’s answer is based on a permissible construction of the statute.’ ” Under this standard, we concluded that the regulation, promulgated under section 7805(a), was not “unreasonable, arbitrary, capricious, or contrary to the plain language of the Code,”
id.
at 442, and held the regulation to be valid.
As we did in
Armstrong World Industries,
we will look to
Chevron
here to determine the validity of Treas. Reg. 1.882^4(a)(3)(i).
Taxpayer argues, however, that the Secretary promulgated an interpretive regulation and that interpretive regulations, as a class, do not merit
Chevron
deference. We disagree. When determining whether Congress intends a particular agency action to carry the force of law, our inquiry does not hinge solely on the type of agency action involved. Rather, “[delegation of such authority may be shown in a variety of ways, as by an agency’s power to engage in adjudication or notice-and-comment rule-making, or by some other indication of a comparable congressional intent.”
Mead,
533 U.S. at 227, 121 S.Ct. 2164. There is no
per se
rule that relegates interpretive rules to the realm of
Skidmore.
Here, the Secretary opened the rule to public comment, a move that is indicative of agency action that carries the force of law.
Id.
at 229-30, 121 S.Ct. 2164;
Cleary v. Waldman,
167 F.3d 801, 808 (3d Cir.1999).
Accordingly, the resulting reg
ulation is entitled to
Chevron
deference if it survives
Chevron’s,
two prong inquiry.
1.
Chevron Step One: Ambiguity of the Statutory Text
First, previous judicial interpretations of I.R.C. § 882(c)(2) do not preempt our analysis in determining if the statute is ambiguous. Taxpayer argues that our analysis is unnecessary pursuant to the Supreme Court’s holding in
National Cable & Telecommunications Assn. v. Brand X Internet Services,
545 U.S. 967, 125 S.Ct. 2688, 162 L.Ed.2d 820 (2005).
Brand X,
however, held that “[o]nly a judicial precedent holding that the statute unambiguously forecloses the agency’s interpretation, and therefore contains no gap for the agency to fill, displaces a conflicting agency construction.”
Id.
at 982-83, 125 S.Ct. 2688. No such opinion exists in this case.
Accordingly, we are not bound by previous judicial interpretations of I.R.C. § 882(c)(2).
Under
Chevron,
if the statutory language is clear and unambiguous, our inquiry ends and the plain meaning of the statute governs the action. 467 U.S. at 842-43, 104 S.Ct. 2778. If, however, the statutory provision is ambiguous, such ambiguity is viewed as an implicit congressional delegation of authority to an agency, allowing the agency to fill the gap with a reasonable regulation.
MCI Telecomm. Corp. v. Bell Atlantic-Pa.,
271 F.3d 491, 515-16 (3d Cir.2001). The inquiry into the ambiguity of a statutory provision must begin with the text of the statute. The text of I.R.C. § 882(c)(2) reads in pertinent part:
A foreign corporation shall receive the benefit of the deductions and credits allowed to it in this subtitle only by filing or causing to be filed with the Secretary a true and accurate return, in the manner prescribed in subtitle F, including therein all information which the Secretary may deem necessary for the calculation of such deductions and credits.
Our inquiry focuses on the requirement that foreign companies file “with the Secretary a true and accurate return, in the
manner
prescribed in subtitle F.” Taxpayer argues that the word “manner” does not by its nature include a timing element, thus indicating that Congress did not intend for a filing deadline to exist. This is
an overly narrow interpretation of “manner.” Courts that have interpreted “manner” as used in I.R.C. § 882(c)(2) and its predecessors have struggled over whether “manner” includes a timing element, which indicates that the language is not clear and unambiguous.
Compare Anglo-American Direct Tea Trading Co. v. C.I.R.,
38 B.T.A. 711, 714 (1938) (discussing divergent conclusions and adopting interpretation that excludes a “timing” element),
with Espinosa v. Comm’r,
107 T.C. 146, 156, 1996 WL 537851 (1996) (reasoning that provision embodied some “cut-off’ period, even if not expressly stated).
Moreover, Congress uses “manner” without “time” in other sections of the Code, and, in some of these situations, “manner” has been interpreted to implicitly include a timing element.
See
I.R.C. §§ 179(c), 835(c)(2). In these provisions, Congress did not use the phrase “time and manner,” yet the Secretary promulgated valid regulations that include temporal components.
See
Treas. Reg. §§ 1.179-5(a), 1.826-l(a)(3)(i). Thus, Congress does not uniformly use the phrase “time and manner” when it desires a particular Code provision to embody a timing element. Rather, we find “manner,” depending on the context, may be a comprehensive term.
As used in this instance, the word “manner” may be defined as “a characteristic or customary way of acting.” Webster’s Dictionary 724 (9th Ed.1986). Under this definition, the provision is not a clear and unambiguous expression of congressional intent, as one’s “customary way of acting” may include an element of timeliness. Further, Congress’s use of “manner” in I.R.C. § 882(c)(2) prompts contextual ambiguity. We could read “manner” to refer to subtitle F, which itself includes timing elements. Alternatively, we could read this provision as indicating that Congress did not wish the timing requirements of subtitle F to apply. Reading the statute this way would not foreclose the Secretary from promulgating a regulation that sets a filing deadline. Instead, it would only restrict the Secretary from promulgating a regulation that would embody the timing elements of subtitle F.
As a result, we hold that Congress’s use of the word “manner” creates ambiguity. Therefore, Congress has not “spoken to the precise question at issue.”
Chevron,
467 U.S. at 843, 104 S.Ct. 2778. Rather, because we find I.R.C. § 882(c)(2) to be ambiguous, the Secretary was justified in promulgating a rule that prescribed a filing deadline.
2.
Chevron Step 2-Reasonableness of the Secretary’s Action
Our inquiry is not yet at its end, as we will only defer to the Secretary’s action if it is a permissible construction of I.R.C. § 882(c)(2).
See Woodall,
432 F.3d at 248 (citing
Chevron,
467 U.S. at 842-43, 104 S.Ct. 2778). We “need not conclude that the agency construction was the only one it permissibly could have adopted to uphold the construction, or even the reading the court would have reached if the question had arisen in a judicial proceeding.”
Chevron,
467 U.S. at 843 n. 11, 104 S.Ct. 2778. Often, a promulgated rule is the culmination of intense debate between the agency, Congress, other members of the Executive Branch and the public. Rules represent important policy decisions, and should not be disturbed if “ ‘this choice represents a reasonable accommodation of conflicting policies that were committed to the agency’s care by the statute:...”’
Id.
at 845, 104 S.Ct. 2778 (quoting
United States v. Shimer,
367 U.S. 374, 382-83, 81 S.Ct. 1554, 6 L.Ed.2d 908 (1961)). Further,
Chevron
deference is “even more appropriate in cases” that involve a “ ‘complex and highly technical
regulatory
program....'" Robert Wood,
297 F.3d at 282 (quoting
Thomas Jefferson Univ. v. Shalala,
512 U.S. 504, 512, 114 S.Ct. 2381, 129 L.Ed.2d 405 (1994)). The Code is indisputably complex and technical, and we will adjust our inquiry accordingly.
In this case, the Secretary has promulgated a rule that creates an eighteen-month window within which foreign companies must file a federal tax return in order to claim rental activity tax deductions. Taxpayer argues that previous cases upholding the disallowance of deductions under I.R.C. § 882(c)(2) involved filing deadlines that permitted at least a two year window within which foreign corporations could have filed timely tax returns. From this, Taxpayer draws the conclusion that it is unreasonable for the Secretary to promulgate a rule with a filing period of less than two years. We find Taxpayer’s argument to be unpersuasive. The Secretary will, under the current regulation, allow a foreign company to file eighteen months after the filing was originally due. Moreover, because I.R.C. § 6072(c) already provides for a five and one-half month filing period, foreign companies have, in practice, twenty-three and one-half months to submit a “timely” return. It is not unreasonable for the Secretary to impose such a deadline.
Additionally, we believe that drawing this temporal line is a task properly within the powers and expertise of the IRS.
Chevron
recognizes the notion that the IRS is in a superior position to make judgments concerning the administration of the ambiguities in its enabling statute. In this case, the IRS found that eighteen months served as a balance between its desire for compliance with the federal tax laws and a foreign corporation’s desire to obtain valuable tax deductions. Therefore, we hold that the eighteen-month filing window created by Treas. Reg. 1.882-4(a)(3)(i) is a reasonable exercise of the Secretary’s authority.
III.
Conclusion
For the forgoing reasons, we will vacate the judgment of the Tax Court and remand this case for further proceedings in accordance with this opinion.