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Part III Administrative, Procedural, and Miscellaneous 26 CFR 301.66011: Interest on underpayments. (Also Part I, 163, 2053, 6166, 6601.) Rev. Pro. 9815 SECTION 1. PURPOSE This revenue procedure provides
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How to fill out 6601-1 interest on underpayments

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How to fill out 6601-1 interest on underpayments:

01
Gather all necessary information related to the underpayment, such as the amount owed, the date of the underpayment, and any applicable interest rates.
02
Fill out the top section of the form, including your name, address, and taxpayer identification number.
03
In Part I of the form, enter the amount of the underpayment in column (a) and the date the underpayment occurred in column (b).
04
Calculate the underpayment interest using the applicable interest rate for the period of time the underpayment was outstanding. Enter the calculated interest amount in column (c).
05
If there were any payments made towards the underpayment, enter the payment amounts and dates in column (d) and (e) respectively.
06
Calculate the interest on any late payments using the applicable interest rate and enter the amount in column (f).
07
Add up the interest amounts in columns (c) and (f) and enter the total in column (g). This is the total interest owed on the underpayment.
08
Complete Part II of the form, providing any additional information or explanations as required.
09
Sign and date the form before submitting it to the appropriate tax authority.

Who needs 6601-1 interest on underpayments?

01
Individuals who have made underpayments of taxes and are required to pay interest on the amount owed.
02
Businesses or corporations that have failed to pay the correct amount of taxes in a timely manner and are liable for interest charges.
03
Taxpayers who have received written notices from the tax authority regarding their underpayment and the requirement to fill out Form 6601-1.
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6601-1 interest on underpayments refers to the interest charged by the IRS on any federal tax underpayments.
Taxpayers who owe additional taxes due to underpayments are required to file 6601-1 interest on underpayments.
To fill out 6601-1 interest on underpayments, taxpayers need to report the amount of underpayment and calculate the interest accordingly.
The purpose of 6601-1 interest on underpayments is to compensate the IRS for the time value of money.
Taxpayers must report the amount of underpayment, the applicable interest rate, and the calculation of interest on 6601-1 interest on underpayments.
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