Interest Calculation



See Instructions Below

 
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Enter the interest Start Date. The interest start date is the day after the due date of the return. For example, if the due date of the return was the end of the month (12-31-04), the interest start date will be 01-01-05. If the due date of the return was the 15th of the month (12-15-04), the interest start date should be 12-16-2004. If the due date of the return was the 25th of the month (12-25-04), the interest start date should be 12-26-2004. Use the appropriate drop down arrows to select the correct month, day and year.

Enter the interest End Date. This is the month the tax or fee amount will be paid. Use the appropriate drop down arrows to select the correct month and year.
Please note: For certain tax programs, a return may be due on a date other than the last day of the month. When selecting the month of payment, the calculator assumes the payment is made on or before the regular due date for that month. For example, a payment made in August for a return due on July 15 will accrue only one month's interest, because the calculator defaults to August 15. If the payment is actually made after August 15th, an additional month's worth of interest will be due so the End Date should be set to 09 (September) rather than 08 (August).

Enter the Due Date. This is the due date of the return. Use the appropriate drop down arrows to select either the "End of the Month", "15th", or "25th".

Enter the Tax or Fee Amount. This is the amount of tax or fee due. This amount should be entered as a whole number, do not enter dollar signs, periods or commas. For example, for $300.00 enter "300"

Click "Calculate" to calculate interest.
Click "Reset" to clear all entries on the form.

The results on this page are estimates based on the information provided by you. The actual interest due may be re-calculated and adjusted on your billing notice. Interest rates are subject to change in July and January. The calculator will not work for the International Fuel Tax Agreement (IFTA) program.


You can call our toll-free 800 Number Information Center for answers to your general tax questions. Representatives are available to assist you Monday through Friday (except state holidays) from 8:00 a.m. to 5:00 p.m. (Pacific Time).

Toll-free number: 1-800-400-7115 (TTY:711)

TDD service for the hearing impaired:

From TDD phones: 1-800-735-2929
From voice phones: 1-800-735-2922