How to Calculate Japan's Consumption Tax: Tax-Inclusive and Pre-Tax Prices With 10% and 8% Charts

The short answer: × 1.1 to add tax, ÷ 1.1 to remove it, ÷ 11 for the tax

There are really only four formulas to remember. Japan's consumption tax has a standard rate of 10% and a reduced rate of 8% for food and a few other items, and in both cases the tax is the pre-tax price multiplied by the rate. Everything else follows from that one idea.

The calculation people get wrong most often is going from tax-inclusive back to pre-tax. It feels natural to think “it went up 10%, so take 10% off,” but ¥1,100 × 0.9 = ¥990, which is ¥10 short of the real pre-tax price of ¥1,000. The tax-inclusive price is 1.1 times the pre-tax price, so you divide by 1.1 to get back.

The four formulas and why they work

Rather than memorizing four formulas, start from one relationship: tax-inclusive = pre-tax × (1 + tax rate). At 10% that is 1 + 0.1 = 1.1, and at 8% it is 1 + 0.08 = 1.08. From there, every direction is easy.

1. 1

   Pre-tax → tax-inclusive: multiply by 1.1 (1.08)

   An item priced at ¥2,980 before tax costs 2,980 × 1.1 = ¥3,278 with tax. If it is food at 8%, 2,980 × 1.08 = 3,218.4, which becomes ¥3,218 after dropping the fraction. Working out the tax first and adding it (2,980 × 0.1 = ¥298, then 2,980 + 298 = ¥3,278) gives the same result.

2. 2

   Pre-tax → tax amount: multiply by 0.1 (0.08)

   For a pre-tax price of ¥9,800, the 10% tax is 9,800 × 0.1 = ¥980, and the 8% tax is 9,800 × 0.08 = ¥784. At 10% you just drop the last digit, so you can do it in your head.

3. 3

   Tax-inclusive → pre-tax: divide by 1.1 (1.08)

   For a tax-inclusive price of ¥3,300, the pre-tax price is 3,300 ÷ 1.1 = ¥3,000. At 8%, ¥1,080 ÷ 1.08 = ¥1,000. When it does not divide evenly, handle the fraction: ¥5,000 ÷ 1.1 = 4,545.45…, rounded down to ¥4,545.

4. 4

   Tax-inclusive → tax amount: divide by 11 (13.5)

   The share of a tax-inclusive price that is tax is 10/110 = 1/11 at 10%, and 8/108 = 2/27 at 8%. So dividing the tax-inclusive price by 11 gives the 10% tax, and dividing by 13.5 gives the 8% tax. For ¥11,000 tax-inclusive, the tax is 11,000 ÷ 11 = ¥1,000; for ¥5,400 at 8%, it is 5,400 ÷ 13.5 = ¥400.

Chart 1: pre-tax to tax-inclusive (10% and 8%)

A chart of common pre-tax prices converted to tax-inclusive prices. The tax is rounded down to the yen.

Prices like ¥1,980 and ¥2,980 become ¥2,178 and ¥3,278 with tax, ¥200–300 more than they look at first glance. When a shop shows prices before tax, thinking “about 10% more” keeps the register from surprising you.

Chart 2: tax-inclusive to pre-tax and tax (10% and 8%)

A chart that works backward from tax-inclusive prices to the pre-tax price and the tax. The pre-tax price is rounded down and the tax is the difference. It is handy for expense reports, or when a budget is fixed including tax and you need the price before tax.

The tax inside ¥1,000 is ¥91 if you round the pre-tax price down and take the difference, but ¥90 if you divide by 11 (90.9…) and round that down. The ¥1 gap is not a mistake; it comes from which number you round. The next section looks at this in detail.

Rounding: down, nearest or up can change the total by ¥1

Multiplying by a tax rate usually leaves a fraction of a yen. Whether to round it down, to the nearest yen, or up is not fixed by law for every case; each shop or business chooses. In practice, most shops round down so customers are never overcharged.

• Round only once. Round one of the three numbers (pre-tax, tax or tax-inclusive) and get the others by adding or subtracting, and “pre-tax + tax = tax-inclusive” will always hold
• When working backward, rounding the pre-tax price down pushes the tax in the same direction as rounding it up. If you want the tax itself rounded down, divide the tax-inclusive price by 11, round that down, and subtract it to get the pre-tax price
• On a qualified invoice under Japan's invoice system, the tax is rounded once per tax rate per invoice. Rounding each line and adding them up is not allowed

How much does rounding each line change things? Say you buy three food items at 8% priced ¥198, ¥298 and ¥158 before tax. Rounding the tax down item by item gives ¥15 + ¥23 + ¥12 = ¥50, but 8% of the ¥654 total is ¥52.32, which is still ¥52 after rounding down. That is a ¥2 difference on a single receipt, and it is the usual reason an invoice's tax does not match the other party's figure. See consumption tax on invoices for more.

Tax-inclusive, tax-exclusive and total price display

Whether a price tag includes consumption tax decides which way you calculate. Japanese uses uchizei (tax included) for a price that already contains the tax, and sotozei (tax excluded) for a price before tax, with the tax added on top.

Since April 2021, price tags and ads aimed at consumers in Japan must show the total amount including consumption tax. So a shop generally can no longer display only a pre-tax price like “¥1,000 + tax.” Quotes and invoices between businesses are not covered by this rule, though, so they are often written before tax. Price tag rules are covered in Japan's total price display rule.

Bills that mix 10% and 8% (the reduced tax rate)

Since October 2019, food and drink (excluding alcohol and eating out) and newspaper subscriptions published at least twice a week have been taxed at a reduced 8%, and everything else at the standard 10%. At supermarkets and convenience stores, a single receipt routinely mixes 8% and 10% items.

For a mixed bill, calculate each rate separately and then add. If food comes to ¥2,400 before tax and household goods to ¥1,500, the food is 2,400 × 1.08 = ¥2,592 and the goods are 1,500 × 1.1 = ¥1,650, for a total of ¥4,242. Lumping everything together as ¥3,900 × 1.1 = ¥4,290 overestimates by ¥48.

The finer lines, such as why eating in and taking out are taxed differently, or when candy with a toy counts as 8%, are covered in Japan's 8% vs 10% consumption tax.

Calculating with a calculator, Excel or your phone

On a calculator, press “amount × 1.1 =” to go from pre-tax to tax-inclusive, and “amount ÷ 1.1 =” to go back. “Amount ÷ 11 =” gives the tax inside a tax-inclusive price. Many Japanese calculators have TAX+ and TAX− keys, but the rate may still be set to an old value (8% or 5%), so test with ¥1,000 first and check that you get ¥1,100.

On a phone, enter the amount in the Japan Consumption Tax & Service Charge calculator and you get the pre-tax price, the tax and the tax-inclusive price at once, with no need to check a calculator's tax setting.

Worked examples: discounts, coupons, service charges and shipping

Consumption tax gets confusing when it combines with discounts or service charges, because the order matters. Here are common situations with real numbers.

• A percentage discount gives the same result, apart from a yen of rounding, whether you apply it before or after tax
• A fixed-amount discount changes what you pay depending on whether it comes off the pre-tax price or the total. In the example above the difference is ¥50, so check whether a coupon says it applies to the pre-tax price or to the bill
• Service charges and consumption tax stack by multiplication, not addition: 1.1 × 1.1 = 1.21 times, not 20% more. See how service charges and consumption tax add up
• Shipping, cash-on-delivery fees and delivery charges normally carry the 10% rate, even when the goods are food taxed at 8%

For discount math itself (how to work out a percentage off, or what 20% off plus another 10% off really comes to), see how to calculate a discount; for whether points back beats a discount, see points back vs a discount.

Tax-free shopping for visitors and the refund system from November 2026

Travelers who do not live in Japan (such as short-term foreign visitors) are exempt from consumption tax on goods bought at tax-free shops, on the condition that they take the goods out of the country. The basic requirements are spending at least ¥5,000 before tax at the same shop on the same day and showing your passport when you buy.

Under the refund system, if you buy an item priced at ¥10,000 before tax, you pay ¥11,000 at the shop and get the ¥1,000 tax back after the check at departure. Refund methods and fees vary by shop and by the refund service it uses, so check when you buy. Details of the system can change, so confirm the latest rules with the National Tax Agency or the Japan Tourism Agency.

Common consumption tax mistakes

You can catch every one of these by checking afterward that pre-tax + tax = tax-inclusive, and that dividing the tax-inclusive price by 1.1 takes you back to the pre-tax price. For documents that stay on record, like invoices and expense reports, make a habit of checking with the reverse calculation.

How to use the Japan Consumption Tax & Service Charge calculator

1. 1

   Enter an amount on the “Tax incl. / excl.” tab

   Type a number into the amount field. You can paste amounts with commas, like “1,980,” or full-width digits as they are.

2. 2

   Choose whether the amount is pre-tax or tax-inclusive

   Pick “Pre-tax (→ get tax-incl.)” or “Tax incl. (→ get pre-tax).” The pre-tax price, the tax and the tax-inclusive price appear together.

3. 3

   Choose the rate and rounding

   Switch between “10% (standard)” and “8% (reduced),” or type any rate in the custom field. For “Fractions below ¥1,” choose Round down, Round to nearest or Round up. The breakdown table shows results at both 10% and 8%, so you can compare the rates at a glance.

4. 4

   Use the “Service charge & bill” tab for restaurant bills

   Enter the menu total, the service charge, any table charge and the number of people to see the bill broken down with service charge and consumption tax, plus the amount per person.

Rounding is applied only once, so “pre-tax + tax = tax-inclusive” always holds whichever direction you calculate in. Amounts are calculated in your browser and are not sent to a server. You can copy the result or share it with a URL.

FAQ

How do I get the pre-tax price from a tax-inclusive price in Japan?

Divide the tax-inclusive price by 1.1 (by 1.08 for the reduced 8% rate). For ¥3,300, 3,300 ÷ 1.1 = ¥3,000. When it does not divide evenly, handle the fraction: ¥5,000 ÷ 1.1 = 4,545.45…, rounded down to ¥4,545. Multiplying by 0.9 is wrong; for ¥1,100 it gives ¥990, ¥10 too little.

How do I find just the tax inside a tax-inclusive price?

At 10%, divide the tax-inclusive price by 11; at 8%, divide by 13.5. The tax in ¥11,000 is 11,000 ÷ 11 = ¥1,000, and the tax in ¥5,400 at 8% is 5,400 ÷ 13.5 = ¥400. Taking 10% of the tax-inclusive price is wrong; for ¥11,000 it gives ¥1,100, ¥100 too much.

Should consumption tax fractions be rounded down or to the nearest yen?

It is not fixed for every case; shops and businesses can choose to round down, to the nearest yen or up, and most consumer-facing shops round down. On a qualified invoice, however, the tax must be rounded once per tax rate per invoice, not item by item.

How much is ¥1,980 plus tax?

At 10%, 1,980 × 1.1 = ¥2,178. At the reduced 8% rate (food and similar items), 1,980 × 1.08 = 2,138.4, which is ¥2,138 after dropping the fraction. ¥2,980 becomes ¥3,278 at 10% and ¥3,218 at 8%.

What is the difference between uchizei and sotozei?

Uchizei is a price that includes consumption tax, and sotozei is a price before tax, with tax added on top. Since April 2021, price tags and ads for consumers in Japan must show the total including tax, so shops generally display tax-inclusive prices.

How do I calculate a bill with both 8% and 10% items?

Calculate each rate separately and add them. With ¥2,400 of food and ¥1,500 of household goods before tax, 2,400 × 1.08 = ¥2,592 and 1,500 × 1.1 = ¥1,650, for ¥4,242. Calculating ¥3,900 × 1.1 all at once gives ¥4,290, ¥48 too much.

What Excel formula calculates Japan's consumption tax?

With the amount in A2, pre-tax → tax-inclusive is =ROUNDDOWN(A2*110/100,0), tax-inclusive → pre-tax is =ROUNDDOWN(A2*100/110,0), and the tax inside a tax-inclusive price is =A2-ROUNDDOWN(A2*100/110,0). Dividing by 1.1 can be off by ¥1 because of decimal precision errors, so integer forms like × 110 ÷ 100 and × 100 ÷ 110 are safer.

Is a discount applied before or after consumption tax?

For a percentage discount like 20% off, the result is the same, apart from rounding, whether you discount before or after tax. A fixed-amount coupon like ¥500 off is different: on a ¥5,000 pre-tax item you pay ¥4,950 if it comes off the pre-tax price and ¥5,000 if it comes off the total.

How does tax-free shopping work for foreign visitors to Japan?

Travelers who do not live in Japan are exempt from consumption tax when they spend at least ¥5,000 before tax at the same tax-free shop on the same day and take the goods out of the country. From November 1, 2026, Japan switches to a refund system: you pay the tax-inclusive price at the shop, and the tax is refunded after customs confirms the goods at departure.