What is a VAT Calculator?
Value Added Tax (VAT) is a tax imposed on the added value generated during the transaction of goods or services. In South Korea, a 10% VAT rate applies to most goods and services, and businesses must separately list the supply amount and VAT when issuing tax invoices.
This VAT calculator automatically computes the remaining amounts when you enter any one of the supply amount, total amount, or VAT. You can also change the tax rate to accommodate various situations such as exports, tax-exempt items, and simplified taxation.
Key Features
3 Calculation Modes
Enter any amount - supply amount, total, or VAT - and the remaining values are automatically calculated.
Customizable Tax Rate
Beyond the standard Korean 10%, you can freely change the rate to handle tax-exempt, zero-rated, or international tax rates.
Comma-Formatted Amounts
Large amounts are displayed with thousand separators (1,000,000) for readability, and each result can be copied with a single click.
Calculation History
The last 5 calculations are automatically saved so you can quickly review previous results.
How to Use
- Select Calculation Mode — Choose the type of amount you want to enter from the tabs at the top: Supply Amount, Total Amount, or VAT.
- Enter Amount — Enter the amount for your selected mode. Commas are automatically added as you type.
- Check/Change Tax Rate — The default rate is set to 10%. Change it as needed for your situation.
- View Results & Copy — Check the supply amount, VAT, and total in the results, and use the copy button to copy any amount to your clipboard.
Use Cases
Issuing Tax Invoices
Accurately separate supply amount and VAT from transaction amounts when issuing tax invoices.
Creating Quotations
Quickly calculate VAT-inclusive or VAT-exclusive amounts for customer quotations.
VAT Filing Preparation
Quickly reverse-calculate sales and purchase tax amounts for quarterly VAT filing preparation.
Consumer Price Setting
Set VAT-inclusive consumer prices or separate VAT from consumer prices to calculate cost prices.
Frequently Asked Questions
What is the VAT rate in South Korea?
The standard VAT rate in South Korea is 10%. This applies to most goods and services. However, some items such as unprocessed food, medical and educational services are exempt from VAT.
What is the difference between supply amount and total amount?
The supply amount is the net transaction amount excluding VAT, while the total amount is the supply amount plus VAT. For example, if the supply amount is 1,000,000 won, adding 100,000 won VAT gives a total of 1,100,000 won.
How do I reverse-calculate VAT from the total amount?
To reverse-calculate VAT from the total (VAT-inclusive) amount: Total / 1.1 = Supply Amount, Total - Supply Amount = VAT. Use the 'Total Amount → VAT' mode in this calculator for automatic calculation.
Is the VAT rate different for simplified taxpayers?
Simplified taxpayers have value-added rates of 1.5% to 4% depending on the business type. You can change the tax rate in this calculator to compute VAT for simplified taxpayers.
When is VAT filing due?
General taxpayers file final returns in January (for Jul-Dec) and July (for Jan-Jun), with preliminary returns in April and October. Simplified taxpayers file once a year in January.
Privacy Notice
This VAT calculator processes all calculations in your browser. Entered amounts and calculation results are never sent to any server. Calculation history is stored only in your browser's localStorage, so you can use it safely without concerns about financial data being exposed.