Trades contract rounding reconciliation calculator

Calculate net total and tax total with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Choose the currency for these amounts. Changing it keeps your numbers and does not convert exchange rates.

Use net total and tax total to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Invoice lines [quantity,unit rate currency]; enter JSON (USD)
[[3,0.335],[2,1.225]]
Supplied tax fraction
0.2
Rounding policy (line or invoice)
line
Net total (USD)
$3.46
Tax total (USD)
$0.69
Invoice total (USD)
$4.15

Try another scenario

Invoice lines [quantity,unit rate currency]; enter JSON (USD)
[[5,0.333],[3,2.225]]
Supplied tax fraction
0.1
Rounding policy (line or invoice)
invoice
Net total (USD)
$8.34
Tax total (USD)
$0.83
Invoice total (USD)
$9.17
Calculation method

Calculation method

Net total (USD)

Line policy rounds each quantity×rate before sum; invoice policy rounds raw net sum once.

Tax total (USD)

Line policy rounds each rounded-line-net×tax; invoice policy rounds net-total×tax once.

Invoice total (USD)

Net+tax.

Symbols and units
a
Invoice lines [quantity,unit rate currency]; enter JSON (USD)
b
Supplied tax fraction
c
Rounding policy (line or invoice)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Tax rate and rounding method supplied; half-up to two decimal currency places. No tax eligibility interpretation. Supported limits: All numeric inputs and computed intermediates must remain finite. Supported numeric input magnitude is zero or 1e-12 through 1e12 in absolute value; reject values outside this bounded range. All lists/JSON record tables are limited to 100 records unless a stricter bound is stated; reject malformed record arity and wrong member types. Policy exactly line or invoice; nonnegative quantities/rates; supplied tax fraction in [0,1]; decimal inputs at most 6 places.
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