Invoice Calculator

Create line-item invoices with tax calculation and formatted preview

What is it and how does it work?

An invoice calculator helps freelancers, small businesses and contractors quickly compute subtotals, taxes, discounts and totals for client invoices. Rather than doing the arithmetic manually — and risking errors that delay payment or damage trust — you enter your line items, tax rate and any discount, and the tool produces the final amount due along with the breakdown your client needs.

Professional invoices require more than just a total: itemised line items, tax amounts shown separately (required in most jurisdictions for VAT/GST compliance), and clear payment terms help clients process invoices faster and reduce disputes. This calculator handles multi-item invoices with per-item quantities and prices, a single tax rate, and optional flat or percentage discounts.

Common use cases

• Freelance project: add line items for design (40 h × $75), copywriting ($500 flat), and stock photos ($120), then add 20% VAT to get the total due.
• Discount scenario: a client gets 10% off for early payment — enter the subtotal, apply the discount, then add tax to see the discounted invoice total.
• Quick estimate: before writing a formal invoice, use the calculator to verify your numbers match what you quoted the client.

Frequently asked questions

Should tax be applied before or after the discount?

In most tax systems, discounts reduce the taxable base — so apply the discount first, then calculate tax on the discounted subtotal. Some jurisdictions differ; check local tax rules if in doubt.

How do I calculate a reverse VAT (extracting tax from a VAT-inclusive price)?

Divide the inclusive price by (1 + tax rate). For 20% VAT: price ÷ 1.20. The result is the net; subtracting it from the inclusive price gives the tax amount.

What is the difference between tax-exclusive and tax-inclusive pricing?

Tax-exclusive (net) prices show the amount before tax; tax is added on top. Tax-inclusive (gross) prices already include tax; the tax portion must be extracted. B2B invoices typically use net pricing; B2C retail often uses inclusive.

Do I need to show tax on invoices?

In most countries with VAT or GST, yes — registered businesses must show the tax amount separately and include their tax identification number. Requirements vary by country and registration threshold; consult a local accountant.

Utility

Password Generator · QR Code Generator · Stopwatch · Countdown Timer · Calculator · Random Number Generator