Japan Local Tax Late Charge

Estimate late payment penalties from due date, payment date, overdue tax, and tiered rates.

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Calculation basis and official references

Reviewed on:

Formula basis

Floor the overdue principal to JPY 1,000; sum principal × annual rate × days ÷ 365 for both spans. A raw charge below JPY 1,000 is zero; otherwise floor it to JPY 100.

Calculation method

This calculator divides the overdue period into the initial lower-rate span and the later span, then estimates a local-tax late charge using the entered annual rates.

Exclusions and checks required

  • Annual special rates and municipality-specific rates are not updated automatically; the entered rates and lower-rate days control the result.
  • Deferral, holidays, installments, reminder fees, and any rule using a denominator other than 365 are not determined.

Example input:：JPY 300,000 paid 120 days after the due date

dueDate
2026-01-31
paymentDate
2026-05-31
taxAmountYen
300000
earlyRatePercent
2.8
lateRatePercent
9.1
earlyDays
30

Verify that 2.8% and 9.1% apply to the municipality and period before relying on this estimate.

Official references

FAQ

Who is this calculator for? Japan Local Tax Late Charge

Estimate late payment penalties from due date, payment date, overdue tax, and tiered rates.

What values should I enter?

Applies to: Japan Donations and Corporate Tax

How should I interpret this estimate?

This calculator divides the overdue period into the initial lower-rate span and the later span, then estimates a local-tax late charge using the entered annual rates.

How to use

  1. Enter your input values and press Calculate.
  2. Review the result and compare it with expected context.
  3. Floor the overdue principal to JPY 1,000; sum principal × annual rate × days ÷ 365 for both spans. A raw charge below JPY 1,000 is zero; otherwise floor it to JPY 100.

Official references