Sales Tax & VAT Calculator
Calculate sales tax, VAT, and GST. Convert between gross and net prices with instant tax breakdowns.
Price with tax
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Price before tax
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Tax amount
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Tax rate applied
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What is the Online Tax & VAT Calculator?
The free Sales Tax & VAT Calculator provides quick arithmetic calculations for tax-inclusive and tax-exclusive prices. Enter the base amount and your applicable tax rate percentage to calculate the total price with tax, the pre-tax net price, and the exact tax difference. It is a straightforward calculation helper for retail shopping, invoice preparation, and basic budgeting.
Whether verifying receipts, preparing client invoices, calculating ecommerce margins, or claiming business expense deductions, this calculator generates immediate line-item breakdowns. Equipped with built-in memory keys (MC, MR, M+, M−, MS), you can aggregate multi-item mixed-tax receipts effortlessly.
Step-by-Step Guide: How to Calculate Sales Tax & VAT
- Select Computation Mode:
- Add Tax (Net to Gross): Calculates tax amount and total gross price from a pre-tax net base.
- Remove Tax (Gross to Net / Reverse VAT): Extracts the pre-tax base and exact tax portion from a gross total.
- Input Price and Tax Percentage Rate: Enter the monetary amount and select standard presets (e.g., 5%, 8%, 10%, 15%, 20%, 21%) or input a custom local rate.
- Choose Rounding Method: Select Round Half Up (Standard), Floor (Truncate), or Ceiling.
- Review Detailed Breakdown: View Gross Price, Net Price, and Exact Tax Amount.
- Use Memory Functions: Store intermediate invoice subtotals using MS and M+ for grand invoice totals.
Core Tax & VAT Formulas
- Gross Price (Adding Tax):
Gross = Net × (1 + Rate/100) - Net Price (Reverse Tax / Removing Tax):
Net = Gross ÷ (1 + Rate/100) - Tax Amount:
Tax = Gross − Net = Net × (Rate/100)
Practical Real-World Calculation Examples
- Adding 20% VAT to a Service Invoice: Net service fee of $1,500.00:
Gross = 1500 × 1.20 = $1,800.00(Tax amount: $300.00). - Extracting Sales Tax (Reverse Tax): Total retail receipt of $115.00 with 15% tax:
Net = 115 ÷ 1.15 = $100.00(Tax amount: $15.00). - Reduced Rate Grocery Calculation: Grocery item priced at $45.00 with 5% reduced tax:
Gross = 45 × 1.05 = $47.25(Tax amount: $2.25).
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Frequently Asked Questions (FAQ)
How do you extract or remove tax from a total price (reverse tax)?
Divide the total tax-inclusive (gross) price by (1 + tax rate / 100). For example, with a 20% VAT rate, divide the gross price by 1.20 to find the pre-tax net price.
What is the formula to add tax to a net price?
Multiply the pre-tax net price by (1 + tax rate / 100). For a $100 item with 10% tax, calculate 100 × 1.10 = $110.
What is the difference between tax-inclusive (gross) and tax-exclusive (net) prices?
Tax-exclusive (net) price is the base cost before sales tax or VAT is added. Tax-inclusive (gross) price is the final amount paid by the customer including tax.
How do you calculate the exact tax amount by itself?
From net price: multiply Net × (Tax Rate / 100). From gross price: subtract Net from Gross (Tax = Gross − (Gross ÷ (1 + Tax Rate / 100))).
What is the difference between VAT, GST, and Sales Tax?
Sales tax is a single-stage tax levied on retail sales to final consumers. VAT (Value Added Tax) and GST (Goods and Services Tax) are multi-stage consumption taxes collected on value added at each production stage.
How does rounding work for tax calculations on invoices?
Most tax jurisdictions require commercial rounding (half up to the nearest cent/penny). Our calculator allows you to choose between standard rounding, truncation (floor), or ceiling.
Can this calculator be used for international VAT rates (UK, EU, Australia, Canada)?
Yes, you can enter any custom percentage rate to calculate UK VAT (20%/5%), EU rates (19%–25%), Canadian GST/HST, or Australian GST (10%).
How do businesses handle input VAT vs output VAT on expenses?
Businesses charge output VAT to customers and pay input VAT to suppliers. The net VAT remitted to the tax authority is Output VAT minus Input VAT.
How do I calculate multiple invoice lines with different tax rates?
Calculate the gross subtotal for each tax tier, save each using the memory key (M+), and press MR to get the cumulative invoice total.
Is this tax calculator free on mobile devices?
Yes, it is 100% free with no registration required and works smoothly across mobile browsers on iOS and Android.
Does this calculator provide legal or tax advice?
No, this tool provides mathematical calculations only. For official business filings, consult certified tax regulations in your jurisdiction.