Due By The 15TH Day Of The Fourth Month Following The Close Of The Taxable Year

Use a Due By The 15th Day Of The Fourth Month Following The Close Of The Taxable Year 2020 template to make your document workflow more streamlined.

What this tax deadline means

Due By The 15TH Day Of The Fourth Month Following The Close Of The Taxable Year is a scheduling rule that places an obligation on the fifteenth day of the fourth month after a business taxable year closes. It is not, by itself, a named IRS form. A calendar-year business generally calculates from a December 31 year end, while a fiscal-year business uses its own closing date. Confirm the specific return, payment, extension, and filing instructions with the IRS because the phrase alone does not identify the required submission.

Business finance teams

Finance teams calculate the fifteenth-day deadline from the taxable year end, collect authorized approvals, and preserve signed supporting records with related accounting workpapers.

Tax professionals

Tax professionals use the phrase as a scheduling reference, then confirm the exact return, payment, extension, and IRS submission requirements before advising the business.

How to calculate the deadline

Calculate the date from the actual taxable year end, then validate the specific filing obligation before preparing documents.

Confirm year end: Identify the taxable year end used by the business.
Count four months: Count four calendar months after that closing month.
Set the date: Set the target on the fifteenth day.
Verify IRS instructions: Confirm the specific IRS filing and payment rules.

Complete the supporting document online

Use this sequence to prepare the specific tax-year record, obtain approval, and preserve signing evidence before the calculated deadline.

Upload document:
Upload the tax-year document to signNow.
Check fields:
Review auto-detected fields and correct omissions.
Assign signers:
Assign authorized signers and required dates.
Complete workflow:
Send, monitor completion, and export evidence.

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Open the record:

The signer opens the assigned tax-year record through the signNow invitation or link.

Authenticate the signer:

The workflow records signer identity and the completed signature event.

Capture timestamps:

The audit trail captures timestamps for access, review, and signing actions.

Seal completion evidence:

The completed document receives integrity protection through signNow’s completion record.

Deliver the final copy:

The signer and sender receive access to the finalized tax-year document.

Export the audit trail:

The sender exports the audit trail with the signed record for retention.

Prepare the document

Upload the relevant tax-year record and confirm the taxable year end, parties, dates, and approval fields.

Send to signers

Assign the authorized preparer, officer, or tax representative and deliver the document through signNow.

Complete signer review

Each signer reviews the specific tax-year information and completes required signature, date, and acknowledgment fields.

Archive the evidence

Download the signed document and audit trail, then archive both with the related accounting records.

Find and fill out the correct due by the 15th day of the fourth month following the close of the taxable year

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Versions	Form popularity	Fillable & printable
SC DoR SC1120 2022	4.8 Satisfied (1110 Votes)
SC DoR SC1120 2020	4.8 Satisfied (4178 Votes)
SC DoR SC1120 2019	4.8 Satisfied (2628 Votes)
SC DoR SC1120 2018	4.8 Satisfied (8892 Votes)
SC DoR SC1120 2017	4.7 Satisfied (752 Votes)
SC DoR SC1120 2016	4.7 Satisfied (1732 Votes)

Federal retention periods for tax records

Apply the retention period to the underlying tax record, signed evidence, and filing circumstances rather than to the deadline phrase alone.

Three years from filing

IRC §6501(a) generally governs federal tax-record assessment periods.

Six years for 25% understatement

IRC §6501(e) extends the period for substantial income understatement.

Indefinite retention for fraud

Fraud can remove the ordinary federal limitation period.

Indefinite retention without filing

No filed return can require indefinite federal record retention.

Longer state or industry period

State and industry rules may require longer retention periods.

Best practices for this tax deadline

Accurate date calculation, document review, and evidence retention reduce avoidable filing and approval errors.

Confirm the taxable year end before calculating

Confirm the taxable year end in the company’s governing records before calculating the deadline. Count four calendar months after that closing month, then identify the fifteenth day as the target date. Document the calculation so accounting staff, approvers, and tax professionals use the same reference.

Match the deadline to the applicable IRS filing

Separate the deadline calculation from the filing obligation itself. Review the applicable IRS return instructions, payment requirements, and extension rules because this phrase alone does not identify a particular return or authorize an extension.

Verify tax-year references before sending

Use signNow to upload the exact supporting record, review auto-detected fields, assign authorized signers, and send the document for completion. Check names, dates, tax-year references, and approval roles before releasing the final signed copy.

Preserve the signed record and audit trail

Export the completed document and audit trail together, then store them with the accounting workpapers. Retain evidence according to the applicable IRS rule and any longer state or industry requirement.

Challenges when calculating the tax deadline

Businesses may confuse this phrase with a specific tax form, creating uncertainty about which return, payment, or supporting record is actually due.
The fourth-month calculation depends on the taxable year’s closing date, so calendar-year and fiscal-year businesses may have different filing deadlines.
Electronic signature workflows can preserve approval evidence, but they do not replace IRS filing instructions, payment procedures, or any required tax return.
Late preparation can leave insufficient time to verify accounting records, obtain authorized signatures, and retain submission evidence before the calculated due date.

Risks when the deadline is mishandled

Incorrect taxable year

May require amended filing

Missing audit trail

Can weaken evidence

Unauthorized signer

May delay approval

State retention conflict

May breach state rules

Troubleshooting this tax deadline workflow

Resolve date-calculation, signing, filing, and retention questions by separating signNow’s evidence workflow from the underlying IRS obligation.

signNow Business includes templates and audit trails at $8 per user per month with annual billing. Upload the tax-year record, review detected fields, assign authorized signers, and verify the final document before sending. The plan does not determine the IRS filing deadline.

No. ESIGN and UETA support electronic signature validity when intent, consent, attribution, and record retention requirements are met, but a signNow signature does not constitute IRS filing or payment. Follow the applicable IRS return instructions separately.

Check whether the taxable year ended on the date used for calculation. Count four calendar months after the closing month and use the fifteenth day of that resulting month, then confirm the applicable IRS instructions or tax professional’s advice.

Signers can review and complete assigned fields from signNow’s web or mobile apps. If a field is missing, reopen the document before sending, use auto-detected fields as a starting point, and manually confirm every tax-year, date, and signature field.

Use stronger authentication when the tax record contains sensitive financial information. signNow supports two-factor authentication options, while ESIGN and UETA focus on intent, consent, attribution, and record retention rather than requiring one universal authentication method.

Export the completed document and audit trail from signNow after signing. Retain them under IRC §6501(a): generally three years from filing, six years for an understatement exceeding 25 percent, or indefinitely for fraud or an unfiled return.

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