How to use the Invoice Calculator
- Add each item with quantity and unit price; use '+ Add item' for more rows.
- Enter any discount and the tax / GST rate.
- Add a delivery or shipping charge if needed.
- Read the subtotal, discount, tax and total due.
How it's calculated
Show the formula
Subtotal = Σ quantity × unit price
Total = (subtotal − discount) × (1 + tax ÷ 100) + delivery
Total = (subtotal − discount) × (1 + tax ÷ 100) + delivery
Tax is worked out after the discount, which is how most invoices are calculated. Delivery is added at the end without tax; include it as an item instead if your tax rules say it is taxable.
Worked example
These are the example numbers the calculator opens with. Change any of them above to see your own result.
You enter
| Website design | 1 qty · Rs 80,000 |
|---|---|
| Logo | 1 qty · Rs 15,000 |
| Hosting (1 year) | 1 qty · Rs 12,000 |
| Discount | 5% |
| Tax / GST | 16% |
| Delivery / shipping | Rs 0 |
You get
| Invoice total | Rs 1,17,914 |
|---|---|
| Status | 3 items |
| Subtotal | Rs 1,07,000 |
| Discount | −Rs 5,350 |
| Tax / GST | Rs 16,264 |
| Delivery | Rs 0 |
| Total due | Rs 1,17,914 |
Tips
- Number your invoices in order and keep a copy of each.
- Show tax separately so registered customers can claim it.
Frequently asked questions
Is tax calculated before or after the discount?
After. Tax is charged on the discounted amount, which is the usual practice.
Is delivery taxed?
Here delivery is added without tax. If it is taxable for you, add it as an item instead.
How many items can I add?
Up to 30 items per invoice.