法令翻訳 http://www.japaneselawtranslat...ky=&page=3

(確定申告税額の延納)
第百三十一条  第百二十条第一項（確定所得申告）の規定による申告書を提出した居住者が第百二十八条（確定申告による納付）の規定により納付すべき所得税の額（第百三十三条第一項（延払条件付譲渡に係る延納の手続）の申請書を提出する場合には、当該所得税の額からその申請書に記載した同項の延納を求めようとする所得税の額を控除した額）の二分の一に相当する金額以上の所得税を第百二十八条の規定による納付の期限までに国に納付したときは、その者は、その残額についてその納付した年の五月三十一日までの期間、その納付を延期することができる。

Deferring Payment of Taxes That Are to Be Paid Upon Filing
Article 131  If a Resident filing a return under Article 120, paragraph (1) (Filing Income Tax Returns) pays income taxes to the national government which are equivalent to at least 50% of the income taxes payable pursuant to the provisions of Article 128 (Payment upon Filing) by the payment due date under Article 128 (or if the Resident submits a paper-based application as referred to in Article 133, paragraph (1) (Process for Deferring Tax Payments connected with Assets Transferred on a Deferred-Payment Basis) and the amount the Resident pays by the due date is at least 50% of the income taxes payable less the amount that the paper-based application states as the part of the income taxes payable whose payment the Resident seeks to defer as referred to in Article 133, paragraph (1)), the Resident may defer the payment of the remaining amount until May 31 of the year in which the Resident has made that first payment by the due date.

前項の規定は、同項に規定する申告書を提出した居住者が、同項に規定する納付の期限までに納税地の所轄税務署長に対し、第百二十八条の規定により納付すべき税額、当該税額のうち当該期限までに納付する金額その他財務省令で定める事項を記載した延納届出書を提出した場合に限り、適用する。

The preceding paragraph applies only if the Resident filing a return as prescribed in that paragraph submits a tax payment deferment notice by the payment due date prescribed in that paragraph to the competent district tax office director for the locality in which the Resident pays taxes, indicating the amount of tax payable pursuant to the provisions of Article 128 and the part of the tax payable that the Resident will pay by the due date, and giving the information prescribed by Ministry of Finance Order.

第一項の規定の適用を受ける居住者は、同項の規定による延納に係る所得税の額に、その延納の期間の日数に応じ、年七・三パーセントの割合を乗じて計算した金額に相当する利子税をその延納に係る所得税にあわせて納付しなければならない。

A Resident applying the provisions of paragraph (1) must pay the income taxes whose payment is subject to a deferment under the provisions of that paragraph, along with a tax levied as interest in an amount equivalent to that arrived at when the income taxes whose payment is deferred are multiplied by an annual rate of 7.3%, based on the number of days in the deferment period.