Enter the amount and rate
How to use the consumption tax calculator, and how Japanese tax works
Converting a pre-tax price to tax-inclusive, or working backwards from a receipt, comes up more often than you would expect. This tool handles the standard 10% rate and the reduced 8% rate in both directions.
How to use it
Enter the amount, pick the rate (10% or 8%) and the direction (add tax or remove tax). Removing tax means dividing by 1.10 (or 1.08), not subtracting 10% — subtracting gives an answer about 0.9% too low, a mistake that quietly distorts bookkeeping.
What the reduced 8% rate covers
Introduced with the 2019 rate rise, the reduced rate applies to food and drink excluding alcohol and dining out, and to subscription newspapers published at least twice a week. The awkward boundary is how food is served: eating in is 10%, taking away is 8%. That is why chains with takeaway often display two prices for the same item.
Tax-inclusive display is mandatory
Since April 2021, consumer-facing prices must be shown inclusive of tax. "1,000 yen (excl. tax)" alone is not permitted; it has to read "1,100 yen", or "1,100 yen (1,000 excl. tax)". This applies to price tags, flyers and websites alike.
Rounding is the seller's choice
When the tax amount produces a fraction of a yen, the law does not mandate a single rounding method — businesses may round down, round up or round to nearest. The same product can therefore differ by one yen between shops. This tool rounds down.
The invoice system
From October 2023 Japan operates a qualified invoice system: claiming input tax credit requires an invoice bearing the issuer's registration number, with the taxable amount and tax shown separately for each rate. For pricing decisions see the margin calculator and the discount calculator. For definitive tax treatment, consult the National Tax Agency or a licensed tax accountant.
Frequently asked questions
How is tax-inclusive / tax-exclusive calculated?+
Switching direction covers both adding and removing tax.
When is the reduced 8% rate used?+
Scope can change, so check official sources.
What are tax-included and tax-added prices?+
This tool handles both via the direction switch.
How is rounding handled?+
In practice, businesses may round down or up differently.
Are my inputs stored?+
・Tax-inclusive = pre-tax × (1 + rate); pre-tax = tax-inclusive ÷ (1 + rate)
・Tax = pre-tax × rate. To remove tax, divide by 1.10 (or 1.08 at the reduced rate) rather than subtracting.
・Consumption Tax Act, as amended from October 2019: standard rate 10%, reduced rate 8%
・The reduced rate covers food and drink excluding alcohol and dining out, plus subscription newspapers published at least twice a week
・Consumption Tax Act, Art. 63 (total-price display): consumer-facing prices must be shown inclusive of tax (from April 2021)
・Rounding of fractions of a yen in the tax amount is chosen by the business (this tool rounds down)
・Qualified invoice system (from October 2023): invoices state the taxable amount and tax separately for each rate
This site does not represent the National Tax Agency or any other body and does not guarantee the accuracy of the results or their tax correctness. Rounding and applicable rates vary by transaction and business. For exact tax and filing, consult a tax professional or official information.