This article explains the Supreme Court decision of March 2, 2010.It concerns the withholding system then in force. The 10% in the text is the income tax rate addressed in that judgment; applicable surtaxes must be checked separately for current withholding.

What Was the Case?

A payer deducts part of the tax when paying remuneration and remits it to the government. Withholding is routine in practice. Yet the meaning of one phrase in its formula reached the Supreme Court: how many days were meant by the Cabinet Order’s “days in the calculation period for the payment amount.”

What Was Disputed?

When an establishment providing entertainment or food and drink with personal hospitality pays hostesses, it must withhold tax. Under the system at issue, tax was 10 percent of remuneration after deducting an amount prescribed by Cabinet Order. Article 322 of the Income Tax Act Enforcement Order defined that deduction for each payment to the same person as ¥5,000 multiplied by the days in the calculation period for that payment.

The establishments calculated and paid remuneration twice monthly, for the 1st through 15th and the 16th through month-end. They calculated withholding after deducting ¥5,000 times all calendar days in each half-month period. A 15-day period therefore gave a deduction of ¥5,000 times 15.

The tax office instead considered the deduction limited to ¥5,000 times actual attendance days. Eight days worked would produce only ¥5,000 times eight. A smaller deduction means greater withholding. Tax payment notices and non-payment penalties were imposed for the difference, and the establishments sued to have them revoked.

The lower court adopted the tax office’s view. Because a sole proprietor’s income is revenue less necessary expenses, it reasoned that a withholding deduction approximating actual expenses best served the system. Since remuneration depended on hours worked on attendance days, expenses naturally arose only on those days. It rejected all the establishments’ claims. At first glance, the interpretation seemed coherent.

What Did the Court Say?

Where hostess remuneration is calculated and paid for fixed periods, “days in the calculation period for the payment amount” in Article 322 means all days within that period, not the hostess’s actual working days.

The Supreme Court rejected the lower court’s reasoning and reversed its judgment. The deduction uses all days in the remuneration calculation period, not actual days worked. Here, that meant every day in the half-month accounting period.

The Word “Period” Determined the Result

Notice where the Court began: with the word “period” itself, rather than statutory purpose or tax fairness. It described a period as a temporally continuous concept, such as the interval from one point in time to another. It therefore naturally read Article 322 as the continuous span from the first to the last day underlying the payment calculation and found no provision supporting a different interpretation.

On its ordinary meaning, a period is an uninterrupted span from first day to last. Selecting only attendance days yields a total number of days, not the number of days in a period. The Court held that the Order’s wording did not permit that reading.

Why Was the Interpretation Closer to Actual Expenses Rejected?

The lower court sought to approximate actual necessary expenses. Viewed solely by its result, that might seem fairer. The Supreme Court nevertheless rejected it for two reasons.

First, the wording. The judgment stated that tax provisions should not be interpreted arbitrarily beyond their text and found the lower court’s reading linguistically difficult. Tax burdens are determined by statutes and orders; a desirable result cannot justify departing from their language. This approach also appears in other tax cases. In a dispute over domicile upon receiving foreign property by gift, a concurring opinion invoked the constitutional requirement of taxation by law. That case is discussed in The Case Disputing “Domicile” for Gift Tax We are dealing with that.

Second, statutory purpose. The Court said legislative explanations indicated that the basic-deduction method for hostess withholding was intended to minimize the administrative burden of later refunds. The deduction was not designed to measure necessary expenses precisely, but to reduce refund work. The lower court’s interpretation was therefore difficult to accept on purposive grounds as well.

The order of reasoning matters: first read the words, then confirm compatibility with purpose. Purpose was not used first to reshape the text. Another tax case, directly addressing uniform valuation under administrative circulars and equality, used a different analytical structure. The difference becomes clearer when compared with The Case Disputing Inherited Property Valuation.

The Case Ended in Remand

The result was reversal and remand. Having held that the deduction was ¥5,000 times all days in the calculation period, the Supreme Court returned the case for calculation of the withholding tax and non-payment penalties due. It resolved the legal meaning of the day count and left the arithmetic to the High Court.

The litigation also concerned whether penalties deducted from remuneration for absence or lateness could be deducted for withholding purposes; the lower court had said no. The Supreme Court judgment addresses the meaning of days under Article 322.

Changes to statutory and Cabinet Order wording are developed through annual tax reform discussions, with policy directions set out in the tax reform outline. The latest is available in The FY2026 Tax Reform Outline. Changed wording can change interpretation, so always verify which version of the law a judgment addresses.

Points that require care in practice

• First identify the exact start and end dates used to calculate remuneration. The closing-date arrangement directly underlies the deduction calculation.
• Actual working days and calendar days in the calculation period are different figures. Check that the formula does not confuse them.
• Changing closing dates or payment frequency changes the period associated with each payment. Check withholding effects before changing the process.
• Withholding is an advance tax deduction, separate from final annual income calculation. The judgment recognizes that a withholding deduction need not equal actual expenses.
• Treat penalties, reimbursements, and other deductions from remuneration separately from the day-count issue when analyzing withholding.
• Where statutory language and explanations of purpose appear inconsistent, begin with the language. This judgment clearly demonstrates that sequence.
• In a dispute, the period rules and calculation records for each period matter. Payment statements should make the calculation period identifiable.

Sources

• Courts: Case Details 2007 (Gyo-Hi) No. 105
• Full Judgment (PDF)Courts