Korea E-Invoice Issuance and Transmission Penalty Reconciliation Calculator
Reconcile Korean 2026 e-invoice penalties by supply, issuance and NTS transmission dates: 2%, 1%, 0.3% and 0.5%. Review duplicate exclusions, obligation-specific caps, previous assessments and notice differences.
Korean 2026 rules · Official sources checked October 8, 2026
Initial amounts and dates are fictional examples. Enter one taxpayer’s ordinary taxable sales and verify actual deadlines. VAT-exempt invoices, corrected invoices, advance issuance, closure and simplified-tax periods require separate review.
Read the NTS penalty guidancePenalty, duplicate exclusion and notice reconciliation
Review date: 2026-08-01 · Final filing deadline: 2026-07-27 · 2026 first period
Complete review amount after caps
Review needed
Notice minus review amount
Review needed
Excluded transmission comparison
0 KRW
Unresolved transactions: 5. Known obligation subtotal: 0 KRW.
Unverified or pending transactions are not treated as zero. A notice difference is not an approved refund, cancellation or immediate payment amount.
| Transaction / status | Supply KRW | Issued / deadline | Transmitted / deadline | Penalty before cap | Excluded transmission | Action / unresolved exposure |
|---|---|---|---|---|---|---|
| Transaction 1 Verify scope, obligation and deadlines | 10,000,000 KRW | 2026-05-12 2026-05-11 | 2026-05-14 2026-05-13 | Review needed | 0 KRW | Verify supply timing, obligation and deadlines |
| Transaction 2 Verify scope, obligation and deadlines | 10,000,000 KRW | 2026-05-11 2026-05-11 | 2026-05-13 2026-05-12 | Review needed | 0 KRW | Verify supply timing, obligation and deadlines |
| Transaction 3 Verify scope, obligation and deadlines | 10,000,000 KRW | 2026-05-11 2026-05-11 | — 2026-05-12 | Review needed | 0 KRW | Verify supply timing, obligation and deadlines |
| Transaction 4 Verify scope, obligation and deadlines | 10,000,000 KRW | — 2026-05-11 | — — | Review needed | 0 KRW | Verify supply timing, obligation and deadlines |
| Transaction 5 Verify scope, obligation and deadlines | 10,000,000 KRW | 2026-05-11 2026-05-11 | — — | Review needed | 0 KRW | Verify supply timing, obligation and deadlines |
Caps by obligation kind
| Kind | Raw total | Intentional part | Previous assessments | Remaining cap | New applied amount |
|---|---|---|---|---|---|
| Late issuance 1% | 0 KRW | 0 KRW | 0 KRW | Review needed | 0 KRW |
| Late transmission 0.3% | 0 KRW | 0 KRW | 0 KRW | Review needed | 0 KRW |
| Nontransmission 0.5% | 0 KRW | 0 KRW | 0 KRW | Review needed | 0 KRW |
Transaction penalties precede caps; caps apply to the obligation totals above. Previous assessments are not added to this ledger again. Fractional KRW are floored for comparison.
Cap reduction: Review needed
Why reconcile Korean e-invoice penalties by transaction?
The statutory supply date, date printed on an invoice, actual issuance date and transmission date to Korea’s National Tax Service can be different.
Adding both a late-issuance penalty and a late-transmission penalty for the same transaction can overstate the modeled burden.
An email sent to a customer also does not prove that transmission to NTS is complete.
This calculator uses Korea’s 2026 rules to organize domestic taxable sales, identify the applicable issuance or transmission violation, and reconcile a notice against the transaction ledger.
Who uses the review, and for what decision?
It is intended for sole proprietors, small company owners and accounting staff reviewing delayed invoice records.
The purpose is to establish the applicable rate, duplicate exclusion and cap conditions from evidence.
Save the ledger and show the official Hometax issuance records, transmission records and penalty notice to a Korean tax adviser.
Additional principal tax, filing penalties and late-payment penalties belong to separate calculations.
Prepare supply values and actual event records
Amount and taxpayer scope
Enter the supply value excluding VAT, rather than the VAT-inclusive payment or the VAT amount.
If an invoice shows a KRW 10,000,000 supply value and KRW 1,000,000 VAT, enter KRW 10,000,000.
One ledger must cover one taxpayer and one ordinary VAT tax period.
Do not combine different taxpayers or first-period and second-period supplies.
For multiple establishments, confirm the cap unit and previous assessments before aggregation.
Dates and issuance form
Use the verified statutory supply date and the actual completed issuance date.
Do not substitute the document’s printed date for the actual issuance date.
For electronic invoices, enter the actual NTS transmission date and verified transmission deadline.
Leave transmission blank when not transmitted; choose not issued when issuance has not occurred.
Paper issuance has no transmission date.
A paper invoice later converted into an electronic invoice has a compound history that requires separate review.
Confirm electronic-issuance status for the transaction date.
Companies have a mandatory electronic-issuance obligation.
For individuals, the KRW 80,000,000 threshold uses the previous year’s taxable and VAT-exempt supply values for each establishment, alongside continuing obligations, the start date and notice rules.
A fall in current sales does not automatically end an existing obligation.
Select confirmed mandatory, confirmed non-mandatory or unverified; the calculator does not infer eligibility from revenue.
Distinguish three separate deadlines
Issuance: supply timing and the next-month 10th
VAT Act Article 34(1) generally requires issuance at the statutory supply time.
Article 34(3) permits issuance by the next-month 10th for qualifying monthly aggregation or verified transaction evidence and other specified conditions.
The exception does not apply automatically to every transaction.
If the 10th falls on a Saturday or public holiday, confirm the next business day.
The reference-date button fills an unadjusted 10th, so verify the exception and replace it with the actual deadline.
Transmission: the day after issuance
VAT Act Enforcement Decree Article 68(7) sets the ordinary transmission deadline as the day after electronic issuance.
It is not the day after supply or automatically the next-month 10th.
Framework Act on National Taxes Article 5 provides deadline exceptions involving Saturdays, Sundays, public and substitute holidays, Labor Day and relevant disruptions.
Enter the officially verified deadline including applicable extensions.
The reference button adds one calendar day without determining holiday treatment.
Final filing: the boundary between delay and nonperformance
VAT Act Article 49 generally requires final filing within 25 days after the tax period ends.
For 2026, the ordinary first-period reference is July 27, 2026, because July 25 is Saturday; the second-period reference is January 25, 2027.
Individual extensions and special tax periods require confirmation.
Actual issuance or transmission on the final deadline is within that deadline.
If no action has occurred on the deadline date, the calculator keeps it pending rather than assuming the entire day has expired.
2026 issuance and transmission penalty rates
| Violation | Ordinary condition | Rate | Cap treatment |
|---|---|---|---|
| Late issuance | Issued after the issuance deadline, through the final filing deadline | 1% | Eligible with verified unintentional status and cap conditions |
| Nonissuance | Not issued by the final deadline, or issued afterwards | 2% | Uncapped |
| Timely paper by mandatory issuer | Paper issued within the issuance deadline despite an electronic obligation | 1% | Uncapped |
| Late transmission | Mandatory issuer, timely electronic issuance, transmission after its deadline through the final deadline | 0.3% | Eligible with verified unintentional status and cap conditions |
| Nontransmission | Mandatory issuer, timely electronic issuance, not transmitted by the final deadline | 0.5% | Eligible with verified unintentional status and cap conditions |
The basic formula is supply value × applicable violation rate.
For KRW 10,000,000, 2% is KRW 200,000; 1% is KRW 100,000; 0.3% is KRW 30,000; and 0.5% is KRW 50,000.
Fractional KRW are floored separately for each transaction as a comparison convention; confirm final tax-return rounding separately.
A verified non-mandatory electronic issuer does not incur these electronic-obligation penalties for timely paper issuance or transmission.
Ordinary tax-invoice late-issuance and nonissuance rules can still apply.
Exclude transmission penalties when issuance violations apply
Excluding a duplicate transmission penalty does not establish that actual transmission is complete.
For an electronic invoice with an issuance violation and no transmission date, the next action still directs you to verify and complete transmission.
Keep outstanding document obligations on the checklist even when their duplicate penalties are excluded.
VAT Act Article 60(2) excludes the transmission penalties in items 3 and 4 from the portions subject to the issuance violations in items 1 or 2.
The calculator reviews both sets of dates but adds only the applicable issuance penalty for that transaction.
Paper issuance and late issuance are not automatically added together either.
For an ordinary paper invoice issued after the issuance deadline but within the final filing deadline, the modeled branch is late issuance at 1%.
What the excluded comparison means
Consider KRW 10,000,000 with an issuance deadline of May 11, actual issuance on May 12, verified transmission deadline May 13, and actual transmission May 14.
The late-issuance penalty is KRW 100,000.
The KRW 30,000 late-transmission comparison is excluded from the total.
This excluded amount is an evidence-based comparison, not an approved refund or cancellation.
When transmission is still pending before the final deadline, the calculator does not invent a finalized 0.5% excluded amount.
KRW 50,000,000 / 100,000,000 caps and their exclusions
Framework Act on National Taxes Article 49(1) caps enumerated penalties by obligation kind at KRW 50,000,000 for SMEs and KRW 100,000,000 for other enterprises.
Intentional violations are uncapped.
Item 3 enumerates VAT Act Article 60(2)(1) and items 3–5, while excluding item 2.
Accordingly, late issuance, late transmission and nontransmission are modeled cap candidates; nonissuance at 2% and timely paper issuance by mandatory issuers at 1% are uncapped.
Do not apply the general NTS cap summary to every violation without checking the statutory enumeration.
Account for previous assessments
Framework Act Enforcement Decree Article 29-2 distinguishes the content of the statutory obligations and applies VAT caps by tax period.
Enter previous assessments for the same taxpayer, period and kind, excluding the transactions entered in this ledger.
Remaining cap = max(0, statutory cap − previous assessments).
New applied amount = min(current unintentional raw penalties, remaining cap) + current intentional penalties.
The ledger uses verified separate late-issuance, late-transmission and nontransmission classifications.
Confirm reclassification or aggregation across establishments with a tax adviser.
Previous assessments reduce cap availability; they are not added to this ledger again.
An SME with KRW 2,000,000 of new raw late-issuance penalties and KRW 49,000,000 of previous same-period late-issuance assessments has a KRW 1,000,000 remaining cap and KRW 1,000,000 new applied amount.
When previous assessments equal or exceed the cap, remaining availability for unintentional new amounts is zero.
A KRW 200,000,000 nonissuance penalty is not reduced by this cap rule.
Transaction rows show amounts before caps, while the obligation table shows aggregate amounts after caps; the tool does not invent a final legal allocation to individual rows.
Step-by-step workflow and supporting evidence
- Prepare one taxpayer’s first or second ordinary VAT period for 2026 and set a review date.
Confirm the actual final filing deadline and supported tax scope. - Enter supply values, statutory supply dates, issuance forms and actual issuance and transmission records.
For partial issuance or multiple originals, establish each document’s scope and remove duplicate entries first. - Verify issuance exceptions and the actual issuance and transmission deadlines after holidays or extensions.
Confirm the electronic obligation in effect on the transaction date.
Keep unknown facts unverified. - Confirm intent, enterprise size and previous assessments for each obligation kind in the same period.
Enter the notice amount for these transactions only, excluding principal tax and unrelated filing or payment penalties. - Calculate, review classifications and exclusions, and save the transaction and cap CSV.
Keep Hometax issuance identifiers, NTS transmission completion records, transaction evidence, extension notices and the assessment notice. - Complete outstanding issuance or transmission and review the saved ledger with your tax adviser.
Recalculate after changing inputs and preserve the updated review date and event records.
Fictional five-transaction example: KRW 480,000
Each transaction has a KRW 10,000,000 supply value, supply date April 30, 2026 and verified issuance deadline May 11, 2026.
The final filing deadline is July 27, 2026 and the review date is August 1, 2026.
Assume verified electronic obligations, ordinary transactions, unintentional violations, SME status and zero previous assessments.
These are fictional validation inputs, rather than market averages or an actual taxpayer’s ledger.
Issuance and transmission delays
Transaction one is issued May 12, with verified transmission deadline May 13 and transmission May 14.
Add KRW 100,000 for late issuance and exclude KRW 30,000 for late transmission.
Transaction two is issued on time May 11, with transmission deadline May 12 and transmission May 13.
Its late-transmission penalty is KRW 30,000.
Nontransmission, nonissuance and paper
Transaction three is issued electronically on time but not transmitted by the final deadline: KRW 50,000.
Transaction four is not issued by the final deadline: KRW 200,000.
Transaction five is timely paper issuance by a mandatory electronic issuer: KRW 100,000.
The five-transaction total is KRW 480,000, with zero cap reduction.
If the notice includes only these five transactions and obligations and totals KRW 510,000, notice minus review amount is KRW 30,000.
Check whether the first transaction’s excluded transmission penalty was included, while also verifying other possible reasons for the difference.
A difference alone does not establish an incorrect assessment or an immediate refund entitlement.
The notice may involve different facts, deadlines, obligations or assessment scope.
Interpret pending records and review-needed totals
Unverified does not mean zero
Unknown electronic obligations, transaction scope or actual deadlines withhold a complete total.
A capped violation also remains unresolved if intent is unknown, or if an unintentional violation lacks verified enterprise size or cap context.
Known obligation amounts are shown as a separate subtotal and must not be compared with the entire notice as a complete result.
A visible before-cap row amount is not a finalized tax assessment.
Unissued transactions remain pending before or on the final deadline, with a separate 2% before-cap exposure if left unissued.
Timely electronic issuance with transmission still pending shows separate 0.5% exposure if left untransmitted.
An already completed late issuance can be classified at 1% from its actual date, but the calculator never assumes a future corrective action has occurred.
Exposure is a conditional comparison rather than a current finalized penalty, and cap treatment remains separate.
A positive notice difference means the entered notice exceeds the review amount; a negative difference means the review amount is higher.
Zero means equality under the entered conditions.
It does not validate principal tax, filing or payment penalties, reductions or the final assessment decision.
Practical uses and scope limitations
Monthly accounting close
Compare monthly aggregated issuance records with transmission completion records to identify invoices issued on time but not transmitted.
Determine whether a supply-to-issuance gap comes from a valid monthly exception or actual delay.
Save the relevant date ledger for the next closing checklist.
Official completion records matter more than email timestamps alone.
Notice review and filing preparation
Align the notice’s transaction scope and obligation amounts with the ledger.
Review duplicate transmission amounts, previous assessments from another period, and confusion between eligible and excluded caps.
Input arithmetic does not automatically prove a ground for cancellation; retain evidence and obtain professional review.
The ledger does not submit a tax return or challenge a notice.
- VAT-exempt electronic invoices follow different provisions and must not be entered as taxable e-invoices.
- Corrected invoices, advance issuance, special supply timing, different establishment names, required-information errors and fictitious transactions require separate review.
- Closure and simplified-tax special periods, input VAT deductions, issuance credits, other filing or payment penalties and reductions are outside scope.
- Duplicate originals or including current transactions again in previous assessments can distort caps.
Reconcile the CSV against original evidence and confirm the scope.
Frequently asked questions
Does the supply value include VAT?
No.
Use the VAT-exclusive value from the original invoice.
For KRW 11,000,000 paid with KRW 10,000,000 supply value and KRW 1,000,000 VAT, enter KRW 10,000,000.
These invoice penalties differ from filing penalties calculated on unpaid principal tax.
Is every invoice timely if issued by the next-month 10th?
First confirm the conditions in VAT Act Article 34(3).
The general rule uses supply timing, while the next-month 10th is a conditional exception.
Verify weekends, public holidays, the actual deadline and document date.
The reference button neither approves the exception nor adjusts holidays.
Do I add 1% late issuance and 0.3% late transmission?
An applicable issuance violation excludes the transmission violation for the same portion of the transaction.
The 0.3% amount is shown only as an excluded comparison when 1% late issuance applies.
Separate transactions can have separate issuance and transmission penalties, which are aggregated normally.
Does late paper issuance mean a combined 2%?
Ordinary paper issuance after the issuance deadline but within the final filing deadline follows the late-issuance 1% branch.
The timely-paper 1% is not added again.
Issuance after the final deadline follows the nonissuance 2% branch.
A paper invoice later converted to electronic form needs separate review of that compound history.
Are all SME penalties capped at KRW 50,000,000?
Only the penalties enumerated in Framework Act Article 49 qualify.
Late issuance, late transmission and nontransmission are cap candidates under verified unintentional conditions.
Nonissuance and timely paper issuance by mandatory issuers fall under VAT Act Article 60(2)(2), which is not enumerated.
Intentional violations are also uncapped; verify the classifications and previous assessments.
Where do existing assessed amounts go?
Use the late-issuance, late-transmission and nontransmission previous-assessment fields for the same taxpayer, tax period and kind.
Exclude the transactions entered here.
Do not copy one combined amount into all three fields or use another period’s assessments.
Verify the actual assessed amount and scope used for the cap, rather than relying only on whether it has been paid.
Why is an unissued invoice before the final deadline unresolved?
Issuance can still occur, so the eventual 1% late-issuance or 2% nonissuance branch is not determined.
Only actual events are classified; unresolved exposure is shown separately.
Add the actual action date and update the review date to reassess.
Unknown transactions are never converted to zero penalties.
Can I immediately claim or pay the notice difference?
The difference is arithmetic between an entered notice and the conditional review amount.
Reconcile scope, records, actual deadlines, exclusions and caps with a Korean tax adviser, then establish the appropriate procedure.
The CSV is review evidence, not an official return, appeal or refund application.
The calculation does not guarantee cancellation or refund.
Official sources, verification date and next action
Official sources were checked October 8, 2026 for Korean 2026 rules.
Direct National Law Information OPEN API calls verified VAT Act MST 276117, Articles 32, 34, 49 and 60, effective January 2, 2026.
VAT Enforcement Decree MST 283641, Article 68, returned an article date of February 27, 2026.
Framework Act MST 289999, Articles 5 and 49, is effective October 2, 2026.
Its Enforcement Decree MST 283623, Article 29-2, returned February 27, 2026, with July 1, 2026 as the search version’s effective date.
Recheck rates, enumerated caps, intentional exceptions, obligation start dates, actual deadlines and return rounding when rules change.
Second-period 2026 supplies filed in 2027 are reviewed using the calculator’s fixed 2026 rule assumption.
- NTS: benefits and penalties
- NTS: issuance and transmission deadlines
- NTS: mandatory electronic issuers
- VAT Act Article 60: rates and duplicate exclusions
- VAT Act Article 34: issuance timing
- VAT Enforcement Decree Article 68: obligations and transmission
- Framework Act Article 49: enumerated caps
- Framework Act Enforcement Decree Article 29-2: obligation kinds and periods
- Framework Act Article 5: deadline exceptions
Save the ledger and complete official records
Enter transaction values, actual events and verified deadlines, then review duplicate exclusions and cap conditions.
Save the CSV, prepare Hometax issuance and transmission records and the notice, and confirm filing or corrective actions with your tax adviser.
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