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Computation of Interest on Tax Underpayments and Overpayments

December 2009

Sutherland here provides update files for the TAXINT computer program to compute interest on Federal tax underpayments and overpayments. To utilize such update files, it is necessary that you have previously obtained from Sutherland Version 1.0 of the TAXINT-2000 program.  When downloaded and installed as described below and in the written instructions provided for the TAXINT program, the update files will keep the program current as new interest rates are announced quarterly by the Internal Revenue Service. Click on the file name to download one or more of the files described below.

The TAXINT update files are compressed and password protected. To access such files once you have downloaded them, it is necessary that you have received the password from your contact at SAB. The files with a "zip" extension have been compressed with a program called pkzip, and you must "unzip" (i.e., uncompress) the compressed file. We suggest you use WINZIP, which will prompt you for the password prior to uncompressing. You may also use PKUNZIP, adding -s*.* at the DOS prompt (*.* being the password). After the update files have been uncompressed, the eight update files should be copied to your directory where the TAXINT program resides.

Additional materials relating to such interest computations are available for viewing or downloading as described below. Some of such material, as indicated below, is in Adobe Acrobat PDF format, and, with the free Adobe Acrobat Reader, such material may be viewed on screen or downloaded and printed. For information on how to download the free reader, visit the Adobe website and follow the instructions provided.

The materials available for viewing or downloading are as follows:

Readme.txt:  A brief description of the TAXINT downloading system (ASCII format). This file may be viewed or printed with your web browser, or, after you have downloaded and saved the file, it can be printed with the DOS command: copy readme.txt prn.

taxint4.zip:  Eight files to update the TAXINT program for the 4th calendar quarter of 2010. The eight files necessary to update the program for the next calendar quarter, when available, will be in a compressed file which will be posted in this section.

taxint.pdf:  A file containing the instructions for the use of the TAXINT program. These instructions normally will have been distributed with the original TAXINT disk. This version of the instructions is in Adobe Acrobat PDF format, and, with the free Adobe Acrobat Reader, it may be viewed on screen or downloaded and printed.

intart.pdf:  Article by James V. Heffernan entitled "Interest on Federal Tax Underpayments and Overpayments" providing a comprehensive review of the history of, and issues involved in, the development of the computation of interest on underpayments and overpayments of Federal income taxes.  This is a 12/1/2004 revision of the article (approximately 80 pages).

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