Davidson petitions this court for review of a decision of the Tax Court sustaining a $388.05 deficiency assessed against him by respondent.

Petitioner’s wife secured an interlocutory decree of divorce from him. The property settlement agreement incorporated by the court in the decree provided in material part as follows:

Petitioner paid his wife the sum of $3,000.00 for the taxable year 1947 and claimed such sum as a deduction from his gross income. Respondent commissioner disallowed said $3,000.00 deduction on the ground that it did not constitute a proper deduction under § 23 (u) of the Internal Revenue Code. The Tax Court sustained respondent and petitioner appeals from that portion of the decision disallowing the sum of $1,-500.00 as a deduction for alimony payments of $125.00 per month to his wife, such payments not being for the support and maintenance of the minor children.

Petitioner claims the deduction pursuant to §§ 22(k) and 23(u) of the Internal Revenue Code, the pertinent provisions of which follow:

The sole question presented in this appeal is whether the disputed payments made by petitioner in the taxable year 1947, were periodic payments, deductible by him under §§ 22(k) and 23(u), or were installment payments “discharging a part of an obligation the principal sum of which is * * * specified in the decree * * * ”, and as such taxable to him under the same sections? The property settlement agreement (supra) specifies not total sum, providing instead for payment of $250.00 monthly for a maximum of five years. Of these payments, $125.00 monthly was allocable to the support and maintenance of petitioner’s wife and $125.00 to the support and maintenance of the minor children.

It is the contention of respondent that the principal sum though not specified as a total figure, is specified in the form of a simple mathematical calculation inasmuch as both the amount of monthly payments and the designated number of months are incorporated in the decree. This contention ignores the possibility that the wife may either die or remarry before the expiration of the period delineated in the decree. In either event the payments would terminate. The existence of these contingencies makes it impossible to determine in advance with any degree of accuracy the amount to be paid under the decree. Section 22 (k) clearly contemplates an amount definite in nature. This court recently decided under similar circumstances in Myers v. Commissioner of Internal Revenue, 9 Cir., 1954, 212 F.2d 448 , that where a property settlement agreement contained no total sum, providing instead for monthly payments for the wife’s support and maintenance over a designated number of months, the principal sum is not calculable and the payments are to be considered periodic payments, not installment payments discharging a part of an obligation the principal sum of which was specified. Such periodic payments are deductible by the husband under §§ 22 (k) and 23 (u) in computation of his net income. See also Smith’s Estate v. Commissioner, 3 Cir., 1953, 208 F.2d 349 , and Baker v. Commissioner, 2 Cir., 1953, 205 F.2d 369 .

The order of the Tax Court is modified in accordance with this opinion.

. 26 U.S.C.A. §§ 22 and 23.