Investment return after fees, tax and inflation
Investment return after fees, tax and inflation: real after-tax rate, future value in nominal and todays dollars, and purchasing power lost on cash.
Answeringour last check, 2026-10-20
1 of 1checks answered this week
642 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://saylorinnovations.com/api/finance/real-return
| Category | Everything else |
|---|---|
| Provider host | saylorinnovations.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-20 | valid payment request | 402 | $0.01 | 642 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"fee_percent": "0.5",
"inflation_percent": "3",
"nominal_return_percent": "8",
"principal": "25000",
"tax_percent": "15",
"years": "20"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"fee_percent": {
"description": "optional yearly fund fee",
"type": "string"
},
"inflation_percent": {
"description": "yearly inflation",
"type": "string"
},
"nominal_return_percent": {
"description": "yearly return before fees, tax and inflation",
"type": "string"
},
"principal": {
"description": "optional starting amount, default 10000",
"type": "string"
},
"tax_percent": {
"description": "optional tax rate on the return",
"type": "string"
},
"years": {
"description": "optional horizon, default 20",
"type": "string"
}
},
"required": [
"nominal_return_percent",
"inflation_percent"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"after_fee_return_percent": {
"description": "Return after fees",
"type": "number"
},
"after_tax_return_percent": {
"description": "Return after fees and tax",
"type": "number"
},
"beats_inflation": {
"description": "True when the real return is positive",
"type": "boolean"
},
"cash_purchasing_power_after_period": {
"description": "What the principal would buy at the end if held as cash",
"type": "number"
},
"fee_percent": {
"description": "Yearly fee",
"type": "number"
},
"future_value_in_todays_dollars": {
"description": "Value at the end adjusted for inflation",
"type": "number"
},
"future_value_nominal": {
"description": "Value at the end in nominal dollars",
"type": "number"
},
"inflation_drag_percent_points": {
"description": "Percentage points of return lost to inflation",
"type": "number"
},
"inflation_percent": {
"description": "Yearly inflation",
"type": "number"
},
"nominal_return_percent": {
"description": "Yearly return before fees, tax and inflation",
"type": "number"
},
"note": {
"description": "Plain-language caveat about how to read and use the result",
"type": "string"
},
"principal": {
"description": "Starting amount",
"type": "number"
},
"purchasing_power_lost_on_cash_percent": {
"description": "Percent of cash purchasing power lost",
"type": "number"
},
"real_after_tax_return_percent": {
"description": "Return after fees, tax and inflation",
"type": "number"
},
"source": {
"description": "Where the data or formula comes from",
"type": "string"
},
"tax_percent": {
"description": "Tax rate on the return",
"type": "number"
},
"years": {
"description": "Horizon in years",
"type": "number"
}
},
"required": [
"real_after_tax_return_percent",
"future_value_in_todays_dollars"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}