delivered the opinion of the Court.

San Juan Trading Company, Inc., a domestic corporation, filed a complaint in the former Tax Court to recover from the Treasurer (now Secretary of the Treasury) of Puerto Rico the sum of $3,367.64 and interest thereon. After the usual proceedings, the court rendered judgment for the plaintiff but only for the sum of $168.38 plus interest. The plaintiff appealed.

San Juan Trading Co., Inc., as buyer, and The Diamond Match Company of Maryland, as seller, signed an agreement in 1933 for the sale in Puerto Rico of matches manufactured by Diamond. By virtue of that agreement and for the pur*780pose of securing to the seller the payment of the price, the parties agreed as follows: (1) immediately upon shipment of a quantity of matches, the seller shall invoice the same to the buyer and shall send a duplicate copy to the Bank of Nova Scotia of San Juan; (2) the buyer, within ten days after the arrival of each shipment, shall pay to the Treasurer of Puerto Rico the corresponding excise tax; (3) the buyer at the time of delivery of the matches sold to its customers in Puerto Rico, shall continue its former practice of obtaining from the customers a draft payable at 30 days, for the amount of the selling price, which selling price shall include the cost of the matches to the buyer, the buyer’s profit, and the excise tax; (4) the buyer shall then endorse those drafts to the order of the seller and deliver the same to the Bank of Nova Scotia, for collection; (5) the seller shall authorize the bank to credit to the account of the buyer the sum of $288 for each 1,000 gross of matches. That sum shall be charged to the seller’s account and reimbursed upon payment of the drafts; (6) the balance of the drafts shall be applied toward the payment of the seller’s invoices of the shipments and any other expenses incurred by the buyer ,- (7) any surplus remaining shall be credited by the bank to the buyer when and as instructed to do so by the seller.

The agreement was in force until 1939, without its terms, being altered in any way. The sale operations were always carried out in pursuance of the terms of the agreement. Act No. 146, which imposed a tax of 30 cents on each gross of square stick matches introduced in the country and 10 cents per gross of round stick matches, went into effect on May 9, 1938. As of that date San Juan Trading Co., Inc. paid under protest the excise tax on the square matches. On June 6, 1939, it filed a complaint against the Treasurer in the United States District Court for Puerto Rico, to recover the excise tax on the ground that Act No. 146 was unconstitutional. The suit was decided by the federal court in its favor and definitively terminated in 1941. See San Juan *781Trading Co. v. Sancho, 114 F.2d 969 (1940), cert. denied, 312 U.S. 702 (1941).

On December 28, 1939, after learning of the judgment of the federal district court, which was favorable to San Juan Trading Co., the latter wrote a letter to The Diamond Match Company informing that, notwithstanding the judgment of the federal court, the Treasurer insisted on collecting the 30-cent excise tax on square matches, extending it to the round matches so as to make the tax uniform, but that San Juan Trading Co. would continue paying under-protest and suing for its refund. It added the following: “In the event of refund, we are entitled to it as our property. . . .” but at the same time it stated that it was willing" to talk about a possible division of such refunds as might be made on shipments delivered after January 1, 1940.

On January 12, 1940, Diamond answered the previous letter informing the San Juan Trading Co. as follows: (1) the refund of excise taxes paid on shipments of square matches made up to and including December 21, 1939,. would be considered as belonging to San Juan Trading Co. or-to its customers; (2) after that date such payments of taxes as are made will be paid to Diamond; (3) in the event the court of appeals finally upholds the validity of the 30-cent. excise tax on all matches, including the round sticks, San Juan Trading Co. will make no claim against Diamond for the additional taxes on the round stick matches delivered prior to December 21, 1939. This requirement was made necessary in view of the first concession.

On January 16, 1940, San Juan Trading Co. replied to The Diamond Co. accepting those conditions but left pend-' ing the question of fees to be paid to the attorneys who-were handling the suit in the federal courts.

In September 1941, the Treasurer refunded to San Juan Trading Co. the sum of $11,610, covering the refund of excise tax paid from December 23, 1939 to December 16, 1940. Out of this sum the San Juan paid $1,741.50 to the *782attorneys and deposited the remaining $9,868.50 in the account of The Diamond Co. at the Bank of Nova Scotia, •without apparently withholding any amount for the payment of income taxes.

By letters of June 25 and 26, 1945, both the Collector .of Corporations and the Assistant Treasurer of Puerto Rico demanded from San Juan Trading Co. payment of the sum of $3,367.64 “covering income taxes withheld by that corporation from Diamond Match Co.” The letter of the Assistant Treasurer referred to “the tax due by your Company in accordance with your annual return of Income Tax Withheld at the Source for the taxable year 1941. . . .”

On July 12, 1945, San Juan Trading Co. wrote a letter to the Collector of Corporations enclosing a check for $3,367.64 “in payment of our receipt No. 240, year 1941, covering income taxes withheld by this corporation from The Diamond Match Company. . . .”

A few days later, August 10, 1945, San Juan Trading Co. wrote to Diamond requesting reimbursement of the latter amount and informing it that it had been forced to pay the tax because, “under the law we should have retained and paid the amount of the tax for your account at the time of making the refund to you. ...” The Diamond replied that it had referred the matter to its attorneys. The last letter which appears in the record is dated September 5, 1950, addressed by San Juan Trading to Diamond, informing that it had filed suit and intended to hold the Diamond liable for the payment of the tax in the event the Tax Court should render judgment in favor of the Treasurer.

In addition to the foregoing, the evidence shows that The Diamond Match Co. is a corporation which has not been registered and has never “engaged in business” in Puerto Rico (within the meaning of this term in the Income Tax Act), or rendered any returns. It was also established that all the excise taxes on matches were passed to the consumer, and that Diamond never sent money to San Juan Trading *783Co. to pay for such taxes. The evidence further shows that the domestic corporation included in its 1941 income its share in the refund of excise taxes and that it paid tax on such income.

After analyzing these facts, the lower court held that the money received by Diamond was taxable income and that San Juan Trading was bound to withhold and pay the tax thereon. However, it rendered judgment for plaintiff for the sum of $168.38 on the ground that the applicable tax in the case was 19 per cent, as required by Act No. 31 of April 12, 1941 (Sess. Laws, p. 478), and not 20 per cent according to the ruling of the Treasurer, applying Act No. 23 of November 21, 1941 (Sess. Laws, p. 74). We turn to consider the errors which the appellant alleges were committed by the trial court.

The appellant first maintains that the court erred in holding that the sum of $9,868.50, which it had sent to The Diamond Match Co., was income taxable to the latter. That conclusion, it contends, is contrary to some of the statements made by the court in the sense that “the excise taxes shall be paid with funds provided by The Diamond Match Co.,” and that the latter “provided the money illegally collected by the Treasurer.” Based on these statements, San Juan Trading Co. concludes that “what The Diamond Match Co. did when it received this money from the appellant was simply to recover the sum which in like amount it had advanced to San Juan Trading to pay for the excise taxes in question,” and, consequently, that that sum constitutes a refund of capital and not an income.

The appellant’s weighing of the facts is absolutely erroneous. The evidence shows beyond any doubt that the manner of paying the excise tax never changed,1 and that the 1939 *784agreement between the two corporations referred exclusively to the ownership right to the refund of the excise tax paid under protest which was expected to be made by the Treasurer, once the decision of the federal court was handed down. Diamond at no time advanced or furnished to the appellant the money to pay for the taxes, and, consequently, the money which it received by way of refund of those excises was. not a return of capital. The money was advanced by the appellant, and it was repaid to it within 30 days and as soon as its customers paid the selling price, which, as pointed out earlier, included the excise tax. What happened in 1939 was simply a dispute between the two corporations as to who was entitled to the expected refund of the excise tax,2 which in fact was a *785godsend since neither of them had paid it,3 and, on the contrary, had passed it to the customers of San Juan Trading Co. and ultimately to the consumers. Diamond prevailed in that dispute by reason of its superior economic strength and the threat to deprive the appellant of the right to sell its products in Puerto Rico.4 The statements of the trial court, although without doubt somewhat inaccurate, must be examined in the light of these circumstances.

Having clarified these facts, let us see whether the money received by The Diamond Match Co. is taxable income under the provisions of the applicable law.

Section 19(a) of Act No. 31 (Sess. Laws 1941, pp. 478, 508) specifies certain “items of gross income” which in the case of nonresident individuals or foreign corporations 5 shall be treated as “income from sources within Puerto Rico.” Certain classes of interest, partnership profits or dividends from domestic corporations, compensation for personal services, rentals or royalties of different kinds, income from the sale of real property located in Puerto Rico, and the amount received from the transportation of freight and passengers from Puerto Rico to the United States or to foreign countries, are listed. Paragraph (6) specifies the deductions allowed in these circumstances and then paragraph (c) also specifies the items which shall be treated as “income from sources without Puerto Rico.” The recovery of taxes is not expressly mentioned in any of these paragraphs.

*786The preceding enumeration is not, however, the only measure provided by the Act. Section 19(e) provides that “Items of gross income, expenses, losses and deductions, other than those specified in subdivisions (a) and (c) shall be allocated or apportioned to sources within or without Puerto Rico under regulations prescribed by the Treasurer.” 6 This provision unquestionably sanctions the legislative intent to levy the tax on all income from sources within Puerto Rico which is not expressly excluded by law. Helvering v. Suffolk Co., 104 F.2d 505, 507 (1939); Allan Coggan, Aliens and the Federal Income Tax, 5 Tax L. Rev. 253, 273 (1950); Annotation, Source of income as within or without the United States under the Internal Revenue Code, 160 A.L.R. 559, 590 (1946).

It being obvious that the money in this case is derived from sources within Puerto Rico, let us determine j whether it is part of the “gross income” defined in the Act.7 ; This problem presents no difficulty either. It is a well-settled ¡rule that money received by a taxpayer by way of refund /of taxes unlawfully or erroneously collected is income taxable in the year of refund. Rothensies v. Electric Storage Battery Co., 329 U.S. 296, 298 (1946); Nash v. Commissioner, 88 F.2d 477 (C.C.A. 7, 1937); Universal Inc. v. Commissioner, 109 F.2d 616 (C.C.A. 7, 1940); cf. Burnet v. Sanford & Brooks Co., 282 U.S. 359 (1931). This rule has been applied to “foreign corporations” under provisions practically identical with those of § 19 of our Act. Helvering v. Suffolk Co., supra. We know also that the legal definition of the phrase “gross income” — which we are bound to apply because of its relation to § 19, Helvering v. Suffolk, supra — does not exclude other sources not specified therein *787and which in ordinary and practical terms are treated as income of a person. This phrase calls for a general and broad interpretation which will meet the legislative intent of exercising in full the power of taxation. Flax v. Treasurer, 76 P.R.R. 365, 370 (1954); Commissioner v. Glenshaw Glass Co., 348 U.S. 426, 429, 430 (1955); 1 Mertens, The Law of Federal Income Taxation § 5.03 (1956 ed.) ; Magill, Taxable Income (1945), passim, at 16-23 and 443-51. ^Consequently, we hold that the money received by The j Diamond Match Co. by way of excise taxes refunded by the ¡ Government of Puerto Rico constituted taxable income of . that corporation under the applicable provisions of the In-( ^come Tax Act.8

San Juan Trading Co., Inc. points out that the lower court committed a second error “in holding that the appellant was bound by law to withhold and pay at the source to the Insular Government the tax” on the money refunded to The Diamond Match Co. The applicable legal provisions are the following:

“Section 22.— (a) All persons, in whatever capacity acting, including lessees or mortgagors of real or personal property, fiduciaries, employers, and all officers and employees of The People of Puerto Rico, and all corporations and partnerships having the control, receipt, custody, disposal, or payment of interest, rent, salaries, wages, commissions, premiums, annuities, compensations, remunerations, emoluments, or other gains, dividends, participation in partnership and corporation profits, and *788other fixed or determinable annual or periodical profits or income, of any non-resident individual not a citizen of Puerto Rico, shall (except as otherwise provided in regulations prescribed by the Treasurer under Section 19) deduct and withhold from such annual or periodical gains, dividends, profits or income, the normal and additional tax fixed by this Act on any non-resident individual not a citizen of Puerto Rico; Provided, That in the case of securities whose owners are unknown, said tax shall be deducted and withheld from the interest on such securities.” (Laws 1941, p. 514.)

“Section 35. — In the case of foreign corporations and partnerships, subject to taxation under this title, not engaged in industry or business within Puerto Rico and not having any office or place of business therein, there shall be deducted and withheld at the source in the same manner and upon the same items of income, as is provided in Section 22, a tax of nineteen (19) per cent thereof, and such tax shall be returned and paid in the same manner and subject to the same conditions as provided in Section 22.” (Laws 1941, p. 526.)

It is obvious that the income in this case is not derived from interest,9 rent, salaries, wages, commissions, premiums, annuities, compensations, remunerations, emoluments, dividends, or participation in corporation profits. We must therefore determine whether it comes within the terms “other gains” and “other fixed or determinable annual or periodical profits or income.” It being obviously determinable income,10 we will direct our attention to the first requirement. Regulation No. 1 of the Treasury Department provides in art. 212(b) as follows:

“. . . The income need not be paid annually if it is paid periodically; that is to say, from time to time, whether or not at regular intervals. That the length of time during which the payments are to be made may be increased or diminished *789in accordance with some one’s will or with the happening of an event does not make the payments any the less determinable or periodical. . . . ” 11

The federal act and the regulations contained provisions, /identical with ours at the time of the payment under con-\ \ sideration.12 Construing those provisions, the federal courts ( \ ruled that an income could be fixed or determinable, annual/ ^or periodical, even though it was not paid annually orj periodically.13 We are convinced that that construction is Ncorrect and that we should therefore adopt it. Otherwise, to ( /.avoid the tax it would suffice to accumulate in a single pay-C ,/ment amounts which should or could have been paid annually ( Nor periodically, or the right to which accrued from time to , "'time.

The controlling precedent in the federal jurisdiction is Commissioner v. Wodehouse, 337 U. S. 369 (1949). Wodehouse, the well-known English author, received in 1938 and 1941 certain payments from United States publishers for the *790right to publish his literary works in serial and book form. The payments were made in advanced and in a lump sum. The United States Supreme Court held, in the light of § § 212(a), 211 and 119 of the Federal Internal Revenue Act, counterpart of the above-mentioned sections of our Act, that such payments constituted royalties for copyright and that they were “fixed or determinable” and “annual or periodical.”

“Once it has been determined that the receipts of the respondent would have been required to be included in his gross income for federal income tax purposes if they had been received in annual payments, or from time to time, during the life of the respective copyrights, it. becomes equally clear that the receipt of those same sums by him in single lump sums as payments in full, in advance, for the same rights to be enjoyed throughout the entire life of the respective copyrights cannot, solely by reason of the consolidation of the payment into one sum, render it tax exempt. No Revenue Act can be interpreted to reach such a result in the absence of inescapably clear provisions to that effect. There are none such here.” (At 393.)

After stating that the purpose of the words “annual” and “periodical” had been mainly to establish some difference between capital gains and other types of income, the Court added:

“In the instant case, each copyright which was to be obtained had its full, original life of 28 years to run after the advance payment was received by the author covering the use of or the privilege of using certain rights under it. Fixed and determinable income, from a tax standpoint, may be received either in annual or other payments without altering in the least the need or the reasons for taxing such income or for withholding a part of it at its source. One advance payment to cover the entire 28-year period of a copyright comes within the reason and reach of the Revenue Acts as well as, or even better than, two or more partial payments of the same sum.” (At 394.)

This same theory, and also in connection with literary copyrights, is followed in Sabatini v. Commissioner, 98 F.2d 753, 755 (C.C.A.2, 1938), and Rohmer v. Commissioner, 153 *791F.2d 61, 63 (C.C.A.2, 1946), cert. denied, 328 U.S. 862 (1946). In the latter case, Judge Jerome Frank likened the situation to interest paid for several years in a single lump sum or to rent paid in advance. “The phrase, we hold, is descriptive of the nature or type of income, regardless of actual manner of payment.” (At 63.)

In Commissioner v. Raphael, 133 F.2d 442 (C.C.A.9, 1943), it was held that interest awarded to the taxpayer as part of a judgment and the interest on the judgment, both of which were paid in a single lump sum, constituted a “determinable annual or periodical gain.” In United States v. Balanovski, 131 F. Supp. 898 (D.C.N.Y. 1955), it was held that the phrase “annual or periodical income” includes discounts received by a foreign partnership for purchases made in the United States, even though all the purchases were made in a single year, intermittently and from different suppliers.14 See, also, Ehrlich v. Higgins, 52 F. Supp. 805, 807 (D.C.N.Y. 1943), and Misbourne Pictures Limited v. Johnson, 189 F.2d 774 (C.C.A.2, 1951).

In the case at bar, although the excise taxes were refunded in one sum, there is no question that the right thereto arose periodically as payments were made under protest. The running of the period of limitation commenced with each payment. (Act No. 8 of April 19, 1927, Sess. Laws, p. 124.) This conclusion can not be altered by the facts that San Juan Trading Co. decided to join its claims in one single judicial proceeding, that the federal court, consequently, also ordered in a single judgment the refund of all excise taxes, and that the officers of the Government of Puerto Rico decided to pay the same in one lump sum. The “nature and type of income” could not be altered to suit the conveniences of the judicial and administrative proceedings.

Having clarified this question, there can be no question *792that San Juan Trading Co. was bound by law to withhold the tax payable by The Diamond. Section 22(a), read together with § 35, imposed that duty on “all corporations and partnerships” having the “control, receipt, custody, disposal, or payment of . . . annual or periodical profits or income” of “foreign corporations and partnerships subject to taxation” of their income, “not engaged in industry or business within Puerto Rico and not having any office or place of business therein. . . .” Therefore, San Juan Trading Co. acted correctly in reporting those incomes in 1941 in its information return of tax withheld at the source, and in paying in 1945 the corresponding tax “withheld by this corporation from The Diamond Match Company.” The question whether the domestic corporation has not, in fact, recovered from The Diamond the money thus paid should be settled by them in an action independent from the one herein and in the light of the applicable legal provisions.

The judgment appealed from will be affirmed.