Auction Seller Commission Net Proceeds Calculator
Subtract exact rounded seller commission and explicit fixed fees from hammer; negative proceeds retained, no buyer premium assumption. Caller independently verifies observations, reference edition, units and applicability; not a grading-service certificate, authentication, conservation treatment, actual market price or legal/insurance entitlement.
Description
A seller’s net proceeds depend on hammer price, commission, and fixed charges.
A seller’s net proceeds depend on hammer price, commission, and fixed charges.1
This calculator uses explicit minor-unit amounts and a supplied commission rate, allowing charges to exceed the price.
When to use Auction Seller Commission Net Proceeds Calculator
Use this tool when you need to summarize the supplied collecting records or matched observations. Prepare independently verified observations, reference edition/context, and matching units or currency basis.
How to use Auction Seller Commission Net Proceeds Calculator and understand its results
- Prepare independently verified observations, reference edition/context, and matching units or currency basis.
- Enter hammerMinor, commissionBasisPoints, fixedFeesMinor, following the field table and calculation rules below, then run the tool.
- Read commissionMinor, netProceedsMinor. For result objects, inspect the nested output fields below, including any missing evidence or selected indices.
- Correct any input issues and run again. Before using a successful result, review its units, signs, evidence coverage, and stated model or reference assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| hammerMinor | Hammer minor; integer minor units in the explicit currency basis. | number | Required |
| commissionBasisPoints | Commission basis points; one basis point is 0.01 percent. | number | Required |
| fixedFeesMinor | Fixed fees minor; integer minor units in the explicit currency basis. | number | Required |
Require nonnegative safe-integer hammer and fee amounts and commission basis points from zero through ten thousand. Round hammer times commission/10000 to minor units, then compute hammer minus commission minus fixed fees using checked exact arithmetic. Retain a negative net rather than clamp it.
netMinor=hammerMinor−roundMinor(hammerMinor×commissionBp/10000)−fixedFeesMinor Read these symbols with the field meanings and branch or reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| commissionMinor | Commission minor; integer minor units in the explicit currency basis. | number |
| netProceedsMinor | Net proceeds minor; integer minor units in the explicit currency basis. | number |
Where monetary amounts are used, keep one explicit currency and minor-unit basis; one basis point is 0.01 percent. Monetary integers and exact products must remain in JavaScript’s safe-integer range. Rational rounding uses nearest minor unit with half ties away from zero, rather than binary floating-point rounding. An input called a reference amount does not fetch or establish an actual price.
{
"input": {
"hammerMinor": 10000,
"commissionBasisPoints": 1500,
"fixedFeesMinor": 200
},
"output": {
"commissionMinor": 1500,
"netProceedsMinor": 8300
}
}Limitations and assumptions
Observations, reference edition, and applicability are independently supplied. Arithmetic and reference summaries do not provide authentication, a certified grade, or an actual market price.
Missing required fields, unknown fields, wrong types, and violated calculation rules return input issues. Numeric values must be finite; nonfinite numeric outputs are rejected.
Alternative or Complementary methods
For a related task, use Realized versus Estimate Hammer Variance Percent Calculator: A hammer-price variance compares an auction result with a stated estimate on the same currency basis. This calculator returns both the signed minor-unit difference and its percentage of the estimate. For a complementary step, use Dealer Buy Price Wholesale Fraction Calculator: A dealer buying fraction applies an explicit wholesale allowance to a reference amount. This calculator computes that fraction in minor currency units without obtaining a dealer offer or appraising a stamp.
References
Similar or alternative tools
- Realized versus Estimate Hammer Variance Percent Calculator
A hammer-price variance compares an auction result with a stated estimate on the same currency basis. This calculator returns both the signed minor-unit difference and its percentage of the estimate.
- Dealer Buy Price Wholesale Fraction Calculator
A dealer buying fraction applies an explicit wholesale allowance to a reference amount. This calculator computes that fraction in minor currency units without obtaining a dealer offer or appraising a stamp.