Invoice Tax & Multi-Currency Converter
Convert invoice amounts across 8 major currencies with real-time VAT and Sales Tax calculations.
Real-time VAT, GST & Multi-Currency invoice calculations powered by live Open FX rates.
| Currency | Net (Before Tax) | VAT (10%) | Gross Total |
|---|---|---|---|
USD | 1,000.00 | 100.00 | 1,100.00 |
EUR | 865.00 | 86.50 | 951.50 |
GBP | 741.00 | 74.10 | 815.10 |
JPY | 157,880 | 15,788 | 173,668 |
VND | 26,127,000 | 2,612,700 | 28,739,700 |
CNY | 6,750.00 | 675.00 | 7,425.00 |
CAD | 1,395.00 | 139.50 | 1,534.50 |
AUD | 1,416.00 | 141.60 | 1,557.60 |
How do I use Invoice Tax & Multi-Currency Converter?
Enter your base invoice figure in the Invoice Amount input field and select your billing currency (USD, EUR, GBP, VND, JPY, CAD, AUD, or CNY).
Specify the applicable VAT, GST, or Sales Tax percentage—or click a quick statutory preset (8%, 10%, 13%, or 20%).
Toggle 'Amount includes VAT (Gross)' when extracting pre-tax Net revenue from a tax-inclusive total, or leave unchecked to add tax on top of a Net subtotal.
Add or remove target currencies in the Conversion Matrix and click 'CSV' or 'Copy Matrix' to export formatted accounting tables.
What features does Invoice Tax & Multi-Currency Converter offer?
Simultaneous multi-currency Net, Tax, and Gross matrix across 30+ global currencies
Bidirectional VAT-Exclusive (Add Tax) and Reverse VAT-Inclusive (Extract Tax) calculation engine
Live foreign exchange rate synchronization via Open Exchange Rates API with offline fallback
Locale-aware currency rounding (0 decimals for VND/JPY/KRW, 2 decimals for USD/EUR/GBP)
One-click Markdown invoice table copy and UTF-8 CSV spreadsheet export
100% Client-Side invoice math — sensitive client billing amounts are never logged or stored
What are the formulas for VAT Exclusive vs. Reverse VAT (Gross-to-Net) calculation?
Cross-border invoicing requires strict precision when adding indirect tax (VAT/GST) to a net contract rate or backing out embedded tax from a gross payment receipt before converting across foreign exchange rates.
VAT Amount = Net × (VAT % ÷ 100) | Gross Total = Net × (1 + VAT % ÷ 100)Used when your contract specifies a pre-tax subtotal and you need to add statutory VAT/GST on top of the invoice.
Net Subtotal = Gross ÷ (1 + VAT % ÷ 100) | VAT Amount = Gross − Net SubtotalUsed when a client pays a tax-inclusive gross sum. Never subtract a flat percentage from Gross—divide by (1 + r) to avoid overstating tax.
Target Amount = Source Amount × (Target Rate to USD ÷ Source Rate to USD)Converts Net, VAT, and Gross figures simultaneously into every selected reporting currency using live mid-market FX rates.
| Jurisdiction | Tax Type | Standard Rate | Reduced / Special Rate | Common Invoicing Currency |
|---|---|---|---|---|
| Vietnam | GTGT (VAT) | 10% | 8% (Stimulus reduced rate) / 5% | VND (₫) & USD ($) |
| United Kingdom | UK VAT | 20% | 5% (Energy/ Domestic) / 0% | GBP (£) |
| European Union | EU VAT | 19% (DE) – 21% (NL/ES) | 5% – 10% reduced tiers | EUR (€) |
| Japan | Consumption Tax (JCT) | 10% | 8% (Food & Subscriptions) | JPY (¥) |
| Australia & Singapore | GST | 10% (AU) / 9% (SG) | 0% Exported B2B Services | AUD (A$) / SGD (S$) |
- Common accounting error: Removing 10% VAT from a $1,100 gross invoice by subtracting 10% ($110) yields $990 (wrong). Dividing $1,100 by 1.10 yields the true $1,000.00 Net amount and $100.00 VAT.
How is Invoice Tax & Multi-Currency Converter used in real-world workflows?
Dual-Currency Client Billing (USD Contract to Local Tax Filing)
Software agencies and contractors billing international clients in USD or EUR must report statutory revenue and VAT (8% or 10%) in local currency (such as VND or JPY). The matrix generates both figures in one view.
Backing Out Embedded VAT/GST from Gross Gateway Payouts
When Stripe, PayPal, or marketplace settlements arrive as tax-inclusive gross totals, accountants toggle 'Amount includes VAT' to extract exact pre-tax Net revenue and remittable tax across UK (20%), EU (19%–21%), and AU (10%) markets.
Multi-Supplier Quote Comparison in Markdown & CSV
Compare vendor quotes denominated in CNY, JPY, EUR, and USD on a normalized Net and Gross basis, then copy the Markdown table directly into Notion, Jira, or GitHub procurement tickets.
Frequently Asked Questions about Invoice Tax & Multi-Currency Converter
Why can't I just subtract 20% from a Gross total to find the pre-tax Net amount?
Because VAT is calculated as a percentage of the Net price, not the Gross price. When 20% VAT is added to a £100 Net invoice, the Gross total becomes £120. If you subtract 20% of £120 (£24), you get £96 instead of £100. To reverse-calculate VAT accurately, you must divide the Gross total by (1 + VAT Rate), which is £120 ÷ 1.20 = £100 Net and £20 VAT.
How are exchange rates updated in the Multi-Currency Matrix?
When the page loads or when you click 'Sync FX', your browser fetches daily mid-market reference rates directly from the Open Exchange Rates API (open.er-api.com). If you are working offline, the calculator seamlessly falls back to built-in reference rates so invoice math never breaks.
How does the calculator handle zero-decimal currencies like VND and JPY?
Currencies such as Vietnamese Dong (VND), Japanese Yen (JPY), and South Korean Won (KRW) do not use fractional cent subdivisions in standard commercial invoicing. The engine automatically formats VND, JPY, and KRW to whole integers while maintaining 2-decimal precision for USD, EUR, GBP, CAD, and AUD.
Can I paste the multi-currency tax table into Notion, Slack, or Excel?
Yes. Click 'Copy Matrix' to copy a clean GitHub-Flavored Markdown table that renders immediately when pasted into Notion, GitHub, Linear, or Slack, or click 'CSV' to download a spreadsheet-ready file for Excel and Google Sheets.
Are my invoice amounts transmitted to any external backend server?
No. The only network request made is an anonymous GET request to fetch public foreign exchange rates. Your invoice numbers, tax rates, and exported tables are computed 100% locally in your browser memory.
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