Revised calculation method for late payment interest charges

Previously, taxpayers who missed the payment due date designated by the tax authorities had to work out their own late payment interest charges day by day, a process many found tedious and confusing. The revision is designed to make this calculation far more manageable and reduce the administrative burden involved.

Under the revised rules, late payment interest charges accruing after the payment due date designated by the tax authorities are calculated on a monthly basis (0.67% per month) rather than a daily basis (0.022% per day) until the tax is paid. The rate applied before the designated due date is unchanged.

(*) The Statutory Payment Deadline (the original tax payment deadline explicitly prescribed under individual tax laws) and the Designated Payment Deadline (the payment deadline specified by the tax authorities on the payment notice issued to the taxpayer) should be distinguished.

For the period from the day immediately following the Statutory Payment Deadline up to the date of the payment notice (or the actual payment date if paid prior to the notice date), the daily rate (0.022% per day) continues to apply as before without change.

The revised method has been applied since July 1, 2026.