Commas and a currency symbol are ignored.
Japanese law does not fix one method — the seller chooses. The default here is rounding down.
Leave it at 0 and the discount rows stay hidden. The discount is applied before tax.
Enter an amount and the figures appear.
Works in both directions — base price to total, or total back to base price. Switch between the 10% standard rate and the 8% reduced rate, choose how sub-yen amounts are rounded, and add a discount percentage to see the reduced prices alongside.
Questions
Can it use the older 5% or 8% rates?
The rate buttons are 10% and the reduced 8%. The 8% that applied from April 2014 to September 2019 is arithmetically identical to the reduced rate, so those figures match. The 5% rate used until March 2014 is not offered.
Can I put these figures straight onto an invoice?
For a single line item, yes. On a qualified invoice covering several items, tax is rounded once per rate for the whole invoice, not once per line — adding up per-line tax figures will disagree with that total. Sum the pre-tax amounts first, then calculate the tax once.
What is the total-price display rule?
Prices shown to consumers must state the tax-inclusive total. Showing both figures is fine as long as the inclusive amount is present. The rule does not apply to business-to-business transactions. This tool always shows the inclusive figure, which is the one that display rule asks for.
Is the amount I type sent anywhere?
No. Everything is calculated in the page, with nothing uploaded and nothing written to browser storage, so unreleased pricing and internal cost figures are safe to enter. Closing the tab clears the field.
Does it handle amounts with decimals?
Decimal input is accepted, but results are shown in whole yen because Japanese consumption tax leaves no sub-yen remainder. For a currency where two decimal places matter, this display is not enough.