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Businessoperations

Invoice & Quotation Calculator

An invoice total with tax added and withholding deducted. Withholding is computed on the pre-tax value rather than the invoice total, which is the detail that makes reconciliations disagree.

Also called: invoice total calculator, tds on invoice.

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Amount the client pays
₹1,08,000

₹1,08,000 payable: ₹1,00,000 taxable plus ₹18,000 of tax, less ₹10,000 withheld at source. Your invoice total is ₹1,18,000.

Taxable value after discount
₹1,00,000
Discount
₹0
Tax
₹18,000
Invoice total
₹1,18,000
Withheld at source
₹10,000
What reaches your account
₹1,08,000

Computed from the published rates for the tax year you selected, which is not necessarily the current year. A calculation, not tax advice, and it does not know anything about your circumstances beyond the figures entered.

Method and background

How this is calculated

Discount comes off the subtotal, tax is added to what remains, and withholding is deducted by the client before payment. The order matters: withholding is calculated on the taxable value before tax, not on the invoice total, so a client who deducts on the gross has over-withheld. Whether tax applies to shipping depends on the jurisdiction and the nature of the supply, which is why it is a switch.

payable = taxable value plus tax, less withholding computed on the pre-tax value
S
Subtotal (currency)
D
Discount (currency)
t
Tax rate (decimal)
w
Withholding rate (decimal)

Worked examples

Each of these is asserted on every build. If a change to the engine ever moved one of these answers, the build would fail before the page could print it.

a lakh invoice with GST and TDS

Subtotal before tax
₹1,00,000
Discount
0%
Tax rate
18%
Tax withheld at source
10%
Shipping or other charges
₹0
Tax applies to shipping too
Yes

Amount the client pays₹1,08,000

Withholding on the 1,00,000 pre-tax value, not on 1,18,000

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a discount reduces both tax and withholding

Subtotal before tax
₹1,00,000
Discount
10%
Tax rate
18%
Tax withheld at source
10%
Shipping or other charges
₹0
Tax applies to shipping too
Yes

Amount the client pays₹97,200

boundary

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no tax and no withholding is the subtotal

Subtotal before tax
₹1,00,000
Discount
0%
Tax rate
0%
Tax withheld at source
0%
Shipping or other charges
₹0
Tax applies to shipping too
Yes

Amount the client pays₹1,00,000

degenerate case

Open this example

Method and limits

What it assumes

  • A single tax rate across the whole invoice.

What it deliberately does not model

  • Mixed rates across line items need each line calculated separately.
  • Reverse charge, where the client accounts for the tax, is not modelled.

Formula version 1.0.0 · definition 1.0.0 · India · Report a problem with this calculator

Frequently asked questions

Is withholding calculated on the total or before tax?
Before tax, on the taxable value. A client deducting on the tax-inclusive total has withheld too much, and the difference comes back only on your return.