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Oklahoma Income Tax Declaration Form

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Oklahoma Income Tax Declaration for Electronic Filing

(for Form 512, 512-S, 513, 513NR or 514)

Do not send to the Oklahoma Tax Commission. Keep Form EF for your records.

For calendar year 2020 or tax year beginning , 2020 and ending , 20 .

1 TAX RETURN INFORMATION (whole dollars only) Complete lines A and B. Enter the applicable amounts from the return, if any.

Form 512: A. Oklahoma taxable income (Form 512, line 1)

B. Refund or balance due (Form 512, line 31 or 26)

Form 512-S: A. Nonresident share of taxable income (Form 512-S, line 1)

B. Refund or balance due (Form 512-S, line 31 or 26)

Form 513: A. Taxable income of fiduciary (Form 513, line 24)

B. Refund or balance due (Form 513, line 37 or 41)

Form 513NR: A. Taxable income of fiduciary (Form 513NR, line 26)

B. Refund or balance due (Form 513NR, line 41 or 45)

Form 514: A. Nonresident share of income (Form 514, line 1)

B. Refund or balance due (Form 514, line 14 or 18)

2 DECLARATION OF OFFICER, PARTNER, MEMBER OR FIDUCIARY

I consent the refund be directly deposited as designated in the electronic portion of the Oklahoma income tax return.

I authorize the Oklahoma State Treasury and its designated Financial Agent to initiate an ACH electronic funds withdrawal (direct debit) entry to the financial institution account indicated in the tax preparation software for payment of the Oklahoma taxes owed on this return and/or a payment of estimated tax. I also authorize the financial institutions involved in the processing of the electronic payment of taxes to receive confidential information necessary to answer inquiries and resolve issues related to the payment.

If a balance due return is being filed, I understand that if the Oklahoma Tax Commission (OTC) does not receive full and timely payment of the tax liability, the entity will remain liable for the tax liability and all applicable interest and penalties.

Under penalties of perjury, I declare I have compared the information contained on the return, with information I have provided to my Electronic Return Originator (ERO), and the amounts described in Part One above, agree with the amounts shown on the corresponding lines of the Oklahoma income tax return. To the best of my knowledge and belief, the return is true, correct, and complete. I consent the return, including this declaration and accompanying schedules and statements, be sent to the OTC by my ERO.

In addition, by using a computer system and software to prepare and transmit my return electronically, I consent to the disclosure to the Oklahoma Tax Commission of all information pertaining to my use of the system and software and to the transmission of my tax return electronically.

3 DECLARATION OF ELECTRONIC RETURN ORIGINATOR (ERO) AND PAID PREPARER

I declare I have reviewed the above taxpayer’s return and the entries on Form EF are complete and correct to the best of my knowledge. (EROs who are collectors are not responsible for reviewing the taxpayer’s return; however, they must ensure Form EF accurately reflects the data on the return.) I have obtained the taxpayer’s signature on Form EF and have provided the taxpayer with a copy of all forms and information to be filed with the OTC, and have followed all other requirements described in the Federal Publication for Modernized e-File. If I am also a Paid Preparer, under penalties of perjury I declare I have examined the above taxpayer’s return and accompanying schedules and statements, and to the best of my knowledge and belief, they are true, correct and complete. This Paid Preparer declaration is based on all information of which I have any knowledge.

ERO Must Retain Form EF - Unless Requested Do Not Submit This Form to the Oklahoma Tax Commission.

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What the Oklahoma Income Tax Declaration Form Is

The Oklahoma Income Tax Declaration Form is a state filing used to report estimated income tax, declare withholding preferences, or notify the Oklahoma Tax Commission of changes that affect state tax liability. It collects taxpayer identity, filing period, estimated taxable income, and payment or withholding instructions in a standard format accepted for processing by the state. Completing the form accurately helps taxpayers calculate required estimated payments, align state withholding with anticipated liability, and reduce the risk of interest or late-payment penalties.

Step-by-step completion process

Follow these four steps to prepare, complete, and submit the Oklahoma Income Tax Declaration Form correctly.

  • 01
    Gather documents: Collect prior tax returns and income proofs.
  • 02
    Complete identification: Enter legal name, SSN or FEIN, and address.
  • 03
    Calculate estimated tax: Compute taxable income and estimated payments.
  • 04
    Sign and file: Sign, date, and submit via chosen method.

Who typically completes this form

The Oklahoma Income Tax Declaration Form is used by individuals, small businesses, payroll departments, and tax preparers who manage state estimated payments or withholding.

  • Individuals with self-employment income or significant nonwage income needing quarterly estimates.
  • Businesses and payroll administrators adjusting state withholding or reporting corporate estimated taxes.
  • Tax professionals preparing client estimated payments and reconciling state withholding changes.

Choose the profile that best matches your situation to follow the most relevant filing and compliance steps.

Key federal and state filing dates to watch

Adhere to quarterly estimated payment dates and annual return deadlines to avoid interest and penalties.

Quarterly estimated dates:

Apr 15, Jun 15, Sep 15, Jan 15 — typical federal and state alignment.

Annual return deadline:

April 15 for Form 1040 state filing alignment; October 15 with approved extension.

W-9 / TIN requests:

Provide W-9 on payer request; no fixed federal deadline.

1099-NEC recipient deadline:

Jan 31 — useful for payers reconciling state withholding obligations.

Extension filing:

Form 4868 extends federal return date to Oct 15; state extensions may vary.

Typical processing milestones after submission

A typical filing moves through preparation, submission, state processing, and final reconciliation stages.

01

Preparation completed

You collect records and confirm calculations before signing.

02

Submission made

Form is sent electronically or by mail to the Oklahoma Tax Commission.

03

State processing

Oklahoma reviews form, posts payments, and updates taxpayer account.

04

Reconciliation

Compare posted payments with estimated tax and adjust future payments.

Electronic vs paper filing: what differs for this form

Compare the main characteristics of electronic submission against paper filing for the Oklahoma Income Tax Declaration Form.

Criteria Electronic filing Paper filing
Submission speed immediate posting mail transit days
Signature method esignature accepted handwritten signature
Audit trail detailed event log limited proof
Processing time faster account update slower posting

eSignature vendor comparison for form signing

Below is a concise comparison of common eSignature providers and basic plan attributes relevant to signing tax forms; signNow is listed first per provider data.

signNow DocuSign Adobe Sign PandaDoc HelloSign
Starting Price $8/user/mo $15/user/mo $14/user/mo $19/user/mo $15/user/mo
Free Trial 7-day free trial Varies Varies Yes, limited Yes, limited
Bulk Send Yes Yes Yes Yes No
Audit Trail Yes Yes Yes Yes Yes
HIPAA Compliant Yes Yes Yes No No

How to configure an online filing workflow

Set these workflow options when preparing the form for electronic completion and submission.

Field Configuration
Authentication Email link, SMS code, or stronger methods
Conditional fields Show estimated tax lines when applicable
Auto-fill Prepopulate TIN and name where authorized
Notification Email receipts and completion certificates

Technical requirements for eSubmission

Verify browser, file format, and integration needs before submitting electronically.

  • Browsers: Modern Chrome, Edge, Safari supported
  • File formats: PDF, DOCX accepted widely
  • Integrations: Salesforce, NetSuite, Google Workspace

Security and compliance features to verify

Encryption in transit: TLS 1.2/1.3
Encryption at rest: AES-256
Audit trail: Timestamps, IP, actions
HIPAA readiness: BAA available when required
21 CFR Part 11: Support for regulated records
Certifications: SOC 2 Type II, ISO 27001

Penalties and risks of incorrect or late filings

Late payment: Interest and late fees may apply
Underpayment: State penalty for insufficient estimates
Incorrect TIN: Backup withholding or rejection
Unsigned form: Returned as incomplete
Data mismatch: Processing delays and audits
Intentional disregard: Higher penalties apply

Common preparation mistakes to avoid

  • Entering an incorrect SSN or FEIN, which can trigger backup withholding, delays, and additional verification steps from the tax authority.
  • Misstating the tax period or effective date, causing payments to be applied to the wrong tax year and requiring reconciliation.
  • Relying on handwritten calculations without documentation; inconsistent rounding or omitted deductions can prompt audits or requests for clarification.
  • Failing to sign the form or provide explicit consent for electronic records, which often results in the return of an incomplete filing.

Real-world examples from organizations using e-signing

These user examples illustrate how e-signing and standardized forms reduce cycle time and support compliance in practice.

Optica Ventures LLC — COO

Optica updated its payment workflows and centralized form signing for remote partners, reducing turnaround time.

  • The interface was simple and customer-friendly.
  • As a result, staff and external parties completed tax declarations faster with fewer errors, improving reconciliation and reducing follow-up correspondence.

Martin Properties — Founder

A real estate operator switched to digital form signing for tenant and vendor tax declarations to maintain compliance across properties.

  • Mobile signing enabled onsite completion.
  • This allowed consistent, auditable filings across multiple offices, facilitated remote approvals, and improved recordkeeping for property tax teams.

Frequently asked questions about the Oklahoma Income Tax Declaration Form

Answers to common questions about completing, signing, and filing the Oklahoma Income Tax Declaration Form.


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