Oklahoma Corporate, Fiduciary and
Partnership Estimated Tax Declaration
General Instructions
Who Must Make A DECLARATION
A corporation or trust with an estimated income tax liability of
$500ormorefortheyearisrequiredtoleadeclarationandpay
equal*quarterlyestimatedtax.Estatesarenotrequiredtolean
estimated tax declaration.
Estimated tax payments made on behalf of the nonresident
partners electing to be included in the composite return must
bemadeunderthepartnership’snameandFederalEmployer
IdenticationNumber.
* For purposes of determining the amount of tax due on any of
the respective dates, taxpayers may compute the tax by placing
taxable income on an annualized basis. See Oklahoma Tax Com-
mission Rule 710:50-13-9.
When To File and Pay
Adeclarationofestimatedtaxshouldbeledandtherstinstall-
ment paid by April 15th for calendar year taxpayers. Fiscal year
taxpayersshouldleandpaytherstinstallmentbythefteenth
day of the fourth month following the beginning of their taxable
year. Other installments should be paid by the due dates shown
below.
Interest for Underpayment
In general, underpayment of estimated tax interest is due if the
tax liability is $500 or more and timely paid quarterly estimated
tax payments are not at least 70% of the current year tax liability
or 100% of the prior year tax liability. The tax liability is the tax
due less all credits except amounts paid on withholding, esti-
mated tax and extension payments. The amount of underpay-
ment of estimated tax interest is computed at a rate of 20% per
annum for the period of underpayment. Note: No underpayment
of estimated tax interest shall be imposed if the tax shown on the
return is less than $1,000. For additional information see 68 O.S.
Sec.2385.7-2385.13orcalltheTaxCommission’sCorporate
Audit Section at (405) 521-3126.
Form OW-8-ESC - page 2
How to Compute Estimated Tax
Trust tax rates are found in the Packet 513 or 513NR instruc-
tions. Corporate income tax is six percent of taxable income.
The tax for partnerships will be determined by reference to Form
514-PT and instructions.
How to Complete Your Tax Declaration Coupon
Name and Address: Enter the name and mailing address.
• Iftheaddresshaschanged,placean‘X’whereindicated
in the upper left corner of the coupon.
Taxpayer FEIN:EntertheFederalidenticationnumber.
Quarter: Enter the quarter for this estimated payment.
Due Date: Enter the quarterly due date. See below for the due
date for each quarter.
Amount of Payment: Enter the amount of estimated tax being
paid with the estimated tax coupon.
Do not send coupon if no payment is required.
Additional Information
Make checks payable to: Oklahoma Tax Commission.
Do NOT send cash.
Mail the coupon, along with payment, to:
Oklahoma Tax Commission
Post Ofce Box 269027
Oklahoma City, OK 73126-9027
Do not enclose any other tax reports or correspondence in
this envelope.
See below for electronic payment information.
The coupon on page 1 will be used for all quarterly estimated tax
payments. The quarterly due dates are shown below.
Electronic Payment Options:
Electronic payments are accepted for estimated income tax pay-
ments at www.tax.ok.gov. There is a convenience fee charged
for utilizing some of the electronic payment services.
Note: If you make your estimated tax payment electronically, do
notmailthispaymentcoupon.Pleaseretaintheconrmation
number for your records.
Due Dates: **
• 1st Quarter
(Calendar Year) April 15
(Fiscal Year) Fifteenth day of the fourth month
• 2nd Quarter
(Calendar Year) June 15
(Fiscal Year) Fifteenth day of the sixth month
• 3rd Quarter
(Calendar Year) September 15
(Fiscal Year) Fifteenth day of the ninth month
• 4th Quarter
(Calendar Year) January 15
(FiscalYear)Fifteenthdayoftherstmonthofthe
succeeding taxable year.
** If the due date falls on a weekend or legal holiday when the
OklahomaTaxCommissionofcesareclosed,yourpaymentis
due the next business day.