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                       Form 41EST — Instructions
                       Payment of Estimated Business Income Tax

Who Must Make Estimated Tax Payments. A                Due Dates. For calendar year taxpayers, estimated 
corporation must make estimated tax payments           tax payments are due by the 15th day of April, June, 
to the Tax Commission if it’s required to make         September, and December. For fiscal year taxpayers, 
estimated tax payments to the Internal Revenue         estimated tax payments are due by the 15th day of the 
Service and owes Idaho income tax of $500 or           4th, 6th, 9th, and 12th months of the tax year.
more. Estimated tax payments aren’t required if the    The due dates for the federal and Idaho estimated tax 
corporation wasn’t required to file an Idaho return    payments are the same. If the due date is on a Saturday, 
the previous tax year.                                 Sunday or legal holiday, the payment is due on the next 
If you received personalized payment vouchers          regular business day.
(Form 41EST), use the appropriate voucher 
for each filing period. If any of the preprinted       Underpayment of Estimated Tax. Interest is due on 
information is incorrect, draw a line through it and   the difference between the amount of estimated tax 
enter the correct information. Check the box on the    payment required to be made on each voucher and the 
voucher if there’s a change in your mailing address.   amount of estimated tax payment actually made. Interest 
                                                       is computed from the due date of the estimated payment 
If you don’t have a preprinted form, use the           until the required amount is paid or until the due date of 
Form 41ES available at tax.idaho.gov.                  the return. The interest rate for 2022 is 3%. The interest 
Estimated Tax Payments. Each estimated tax             rate for 2023 is 5%.
payment must be 25% of the lesser of the tax           Use Form 41ESR to determine the amount of any 
required to be reported on the corporation’s return    underpayments of tax and interest due when you file your 
for the prior year, or 90% of the income tax required  return.
to be paid on the current year’s return. Don’t include 
fuels tax, sales/use tax, fuels tax refunds, tax from  Overpayment of Estimated Tax. Excess estimated tax 
the recapture of qualified investment exemption        payments will be refunded after you file the completed 
(QIE) or Tax Reimbursement Incentive Act credit        return. You may apply all or part of the excess to next 
reported on the income tax returns.                    year’s estimated tax by designating the amount on the 
                                                       Idaho Form 41 or the Idaho Form 41S.
For corporations, the tax required to be reported is 
defined as Idaho taxable income multiplied by the      Overpayments will be applied to any prior year tax 
appropriate tax rate, plus the permanent building      liabilities before carryovers or refunds are allowed. 
fund tax, plus tax from recapture of business income   You will be notified if your overpayment is applied to 
tax credits, minus allowable income tax credits. A     an existing liability or is used to reduce your refund or 
corporation making estimated tax payments in a year    carryover.
following the revocation of subchapter S status will 
                                                       Annualized Income and Estimated Tax Payments. 
use $20 as the tax amount required to be reported 
                                                       If your estimated payments are based on annualized 
on the prior year’s return.
                                                       income for federal purposes, you may use the same 
For S corporations, estimated tax payments are         method for making Idaho estimated tax payments. 
computed on the Idaho tax due to net recognized        The estimated tax due for the installment period is 
built-in gains and excess net passive income.          calculated by multiplying the applicable percentage 
Estimated tax payments aren’t required on the tax due  (22.5%, 45%, 67.5%, and 90% for the 1st, 2nd, 3rd, and 
on income being reported for individual shareholders.  4th installments, respectively) by the full year’s tax on the 
                                                       annualized income for the period and deducting any prior 
Computation of Estimated Tax Payments. The             installments.
Form 41EST worksheet allows you to compare the 
income tax on last year’s return with the anticipated  Short Tax Year. If the short tax year ends before any 
income tax for the current year. Use the smaller       remaining due dates, you must make a final estimated 
of the two amounts to determine the estimated          tax payment by the 15th day of the last month of the 
tax payment for each period. If your estimated tax     short tax year. No estimated tax payment is required 
payments are based on 90% of the income tax            if the short tax year is less than four months or if the 
required to be paid on the current year’s return and   requirements to make an estimated tax payment aren’t 
the anticipated income tax for the current year is     met before the first day of the last month in the short 
revised, use the revised amount to recompute any       tax year. 
remaining estimated tax payments.
EIN00035 12-30-2022                                                                                   Page 1 of 2



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                                                                Form 41EST Worksheet(continued)                  

         Use the worksheet below to determine your corporate estimated tax payments.

1.  Anticipated Idaho taxable income this year .................................................................... 1 

2.  Income tax on anticipated Idaho taxable income. Multiply line 1 by 6% ........................                               2 

3.  Permanent building fund tax ($10 or, if a combined report, multiply $10 
 by the number of corporations required to file for income tax purposes) .......................                                 3 

4.  Tax from recapture of business income tax credits. See Form 44, Part II, 
 for a complete list ........................................................................................................... 4 

5.  Total income tax. Add lines 2 through 4 .......................................................................... 5 

6.  Anticipated income tax credits ........................................................................................ 6 

7.  Estimated income taxes payable on this year’s return. Line 5 minus line 6 ................... 7 
 If the amount is less than $500, stop here. 
 You aren’t required to make estimated tax payments.
                                                                                                                                  
8.  Multiply line 7 by 90% ..................................................................................................... 8 

9.  Idaho total tax less the total of any fuels tax, sales/use tax, tax from recapture 
 of QIE and Tax Reimbursement Incentive credit from the 2021 return ........................... 9 

10. Estimated tax payments. Multiply the smaller of lines 8 or 9 by 25%.
 This is the amount of each estimated tax payment. Enter this amount in the 
 “Payment Due” box of your Form 41EST ...................................................................... 10 

                                             Contact us:
                    In the Boise area: (208) 334-7660 |Toll free: (800) 972-7660
                                  Hearing impaired (TDD) (800) 377-3529
                                           tax.idaho.gov/contact
EIN00035 12-30-2022                                                                                                                Page 2 of 2






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