would have been the correct amount of tax but for the mathematical error, such notice shall not be considered (for the purposes of this subsection, or of subsection (a) of this section, prohibiting assessment and collection until notice of deficiency has been mailed, or of section 322 (c), prohibiting credits or refunds after petition to the Board of Tax Appeals) as a notice of a deficiency, and the taxpayer shall have no right to file a petition with the Board based on such notice, nor shall such assessment or collection be prohibited by the provisions of subsection (a) of this section.

(g) JURISDICTION OVER OTHER TAXABLE YEARS.— The Board in redetermining a deficiency in respect of any taxable year shall consider such facts with relation to the taxes for other taxable years as may be necessary correctly to redetermine the amount of such deficiency, but in so doing shall have no jurisdiction to determine whether or not the tax for any other taxable year has been overpaid or underpaid.

(h) FINAL DECISIONS OF BOARD. For the purposes of this title the date on which a decision of the Board becomes final shall be determined according to the provisions of section 1005 of the Revenue Act of 1926.

(i) PRORATING OF DEFICIENCY TO INSTALLMENTS.-If the taxpayer has elected to pay the tax in installments and a deficiency has been assessed, the deficiency shall be prorated to the four installments. Except as provided in section 273 (relating to jeopardy assessments), that part of the deficiency so prorated to any installment the date for payment of which has not arrived, shall be collected at the same time as and as part of such installment. That part of the deficiency so prorated to any installment the date for payment of which has arrived, shall be paid upon notice and demand from the collector.

(j) EXTENSION OF TIME FOR PAYMENT OF DEFICIENCIES.-Where it is shown to the satisfaction of the Commissioner that the payment of a deficiency upon the

date prescribed for the payment thereof will result in undue hardship to the taxpayer the Commissioner, with the approval of the Secretary (except where the deficiency is due to negligence, to intentional disregard of rules and regulations, or to fraud with intent to evade tax), may grant an extension for the payment of such deficiency or any part thereof for a period not in excess of eighteen months, and, in exceptional cases, for a further period not in excess of twelve months. If an extension is granted, the Commissioner may require the taxpayer to furnish a bond in such amount, not exceeding double the amount of the deficiency, and with such sureties, as the Commissioner deems necessary, conditioned upon the payment of the deficiency in accordance with the terms of the extension.

(k) ADDRESS FOR NOTICE OF DEFICIENCY.-In the absence of notice to the Commissioner under section 312 (a) of the existence of a fiduciary relationship, notice of a deficiency in respect of a tax imposed by this title, if mailed to the taxpayer at his last known address, shall be sufficient for the purposes of this title even if such taxpayer is deceased, or is under a legal disability, or, in the case of a corporation, has terminated its existence.

SEC. 273. JEOPARDY ASSESSMENTS.

(a) AUTHORITY FOR MAKING.-If the Commissioner believes that the assessment or collection of a deficiency will be jeopardized by delay, he shall immediately assess such deficiency (together with all interest, additional amounts, or additions to the tax provided for by law) and notice and demand shall be made by the collector for the payment thereof.

(b) DEFICIENCY LETTERS.-If the jeopardy assessment is made before any notice in respect of the tax to which the jeopardy assessment relates has been mailed under section 272 (a), then the Commissioner shall mail a notice under such subsection within sixty days after the making of the assessment.

(c) AMOUNT ASSESSABLE BEFORE DECISION OF BOARD. The jeopardy assessment may be made in respect of a deficiency greater or less than that notice of which has been mailed to the taxpayer, despite the provisions of section 272 (f) prohibiting the determination of additional deficiencies, and whether or not the taxpayer has theretofore filed a petition with the Board of Tax Appeals. The Commissioner shall notify the Board of the amount of such assessment, if the petition is filed with the Board before the making of the assessment or is subsequently filed, and the Board shall have jurisdiction to redetermine the entire amount of the deficiency and of all amounts assessed at the same time in connection therewith.

(d) AMOUNT ASSESSABLE AFTER DECISION OF BOARD. If the jeopardy assessment is made after the decision of the Board is rendered such assessment may be made only in respect of the deficiency determined by the Board in its decision.

(e) EXPIRATION OF RIGHT TO ASSESS.-A jeopardy assessment may not be made after the decision of the Board has become final or after the taxpayer has filed a petition for review of the decision of the Board.

(f) BOND TO STAY COLLECTION.-When a jeopardy assessment has been made the taxpayer, within 10 days. after notice and demand from the collector for the payment of the amount of the assessment, may obtain a stay of collection of the whole or any part of the amount of the assessment by filing with the collector a bond in such amount, not exceeding double the amount as to which the stay is desired, and with such sureties, as the collector deems necessary, conditioned upon the payment of so much of the amount, the collection of which is stayed by the bond, as is not abated by a decision of the Board which has become final, together with interest thereon as provided in section 297.

(g) SAME-FURTHER CONDITIONS.-If the bond is given before the taxpayer has filed his petition with the Board under section 272 (a), the bond shall contain a

further condition that if a petition is not filed within the period provided in such subsection, then the amount the collection of which is stayed by the bond will be paid on notice and demand at any time after the expiration of such period, together with interest thereon at the rate of 6 per centum per annum from the date of the jeopardy notice and demand to the date of notice and demand under this subsection.

(h) WAIVER OF STAY.-Upon the filing of the bond the collection of so much of the amount assessed as is covered by the bond shall be stayed. The taxpayer shall have the right to waive such stay at any time in respect of the whole or any part of the amount covered by the bond, and if as a result of such waiver any part of the amount covered by the bond is paid, then the bond shall, at the request of the taxpayer, be proportionately reduced. If the Board determines that the amount assessed is greater than the amount which should have been assessed, then when the decision of the Board is rendered the bond shall, at the request of the taxpayer, be proportionately reduced.

(i) COLLECTION OF UNPAID AMOUNTS.-When the petition has been filed with the Board and when the amount which should have been assessed has been determined by a decision of the Board which has become final, then any unpaid portion, the collection of which has been stayed by the bond, shall be collected as part of the tax upon notice and demand from the collector, and any remaining portion of the assessment shall be abated. If the amount already collected exceeds the amount determined as the amount which should have been assessed, such excess shall be credited or refunded to the taxpayer as provided in section 322, without the filing of claim therefor. If the amount determined as the amount which should have been assessed is greater than the amount actually assessed, then the difference shall be assessed and shall be collected as part of the tax upon notice and demand from the collector.

(j) CLAIMS IN ABATEMENT.-No claim in abatement shall be filed in respect of any assessment in respect of any tax imposed by this title.

SEC. 274. BANKRUPTCY AND RECEIVERSHIPS.

(a) IMMEDIATE ASSESSMENT.-Upon the adjudication of bankruptcy of any taxpayer in any bankruptcy proceeding or the appointment of a receiver for any taxpayer in any receivership proceeding before any court of the United States or of any State or Territory or of the District of Columbia, any deficiency (together with all interest, additional amounts, or additions to the tax provided for by law) determined by the Commissioner in respect of a tax imposed by this title upon such taxpayer shall, despite the restrictions imposed by section 272 (a) upon assessments be immediately assessed if such deficiency has not theretofore been assessed in accordance. with law. In such cases the trustee in bankruptcy or receiver shall give notice in writing to the Commissioner of the adjudication of bankruptcy or the appointment of the receiver, and the running of the statute of limitations on the making of assessments shall be suspended for the period from the date of adjudication in bankruptcy or the appointment of the receiver to a date 30 days after the date upon which the notice from the trustee or receiver is received by the Commissioner; but the suspension under this sentence shall in no case be for a period in excess of two years. Claims for the deficiency and such interest, additional amounts and additions to the tax may be presented, for adjudication in accordance with law, to the court before which the bankruptcy or receivership proceeding is pending, despite the pendency of proceedings for the redetermination of the deficiency in pursuance of a petition to the Board; but no petition for any such redetermination shall be filed with the Board after the adjudication of bankruptcy or the appointment of the receiver.