# Cost indicators

### General assumptions 2025

<table data-header-hidden><thead><tr><th width="323.99993896484375">Name</th><th width="82">Type</th><th width="194.333251953125">Description</th><th width="90.6666259765625">Default</th><th>Notes</th></tr></thead><tbody><tr><td>fixed_gas_price</td><td>float</td><td>Fixed gas cost.Transporttarief + vast leverlingstarief</td><td>337,89</td><td>In €/year</td></tr><tr><td>variable_gas_price</td><td>float</td><td>Variable price exc. tax. Variabel leveringstarief contractprijs</td><td>0.6595</td><td>In €/m^3</td></tr><tr><td>energy_tax_gas</td><td>float</td><td>Energy tax on gas</td><td>0.69957</td><td>In €/m^3</td></tr><tr><td>fixed_electricity_price</td><td>float</td><td>Fixed electricity price. Transporttarief + vast leveringstarief</td><td>575.76</td><td>In €/year</td></tr><tr><td>variable_electricity_price</td><td>float</td><td>Variable price exc. tax. Variabel leveringstarief contractprijs</td><td>0.1470</td><td>In €/kWh</td></tr><tr><td>energy_tax_electricity</td><td>float</td><td>Energy tax on electricity</td><td>0.12286</td><td>In €/kWh</td></tr><tr><td>fixed_heat_price</td><td>float</td><td>From Vattenvall, tarifs 2025</td><td>760.77</td><td>In €/year</td></tr><tr><td>energy_tax_heat</td><td>float</td><td>Tax on consumed external heat</td><td>0</td><td>In €/GJ</td></tr><tr><td>variable_heat_price</td><td>float</td><td>From Vattenvall, including, rent afleverset</td><td>43.79</td><td>In €/GJ</td></tr><tr><td>tax_credit</td><td>float</td><td>Vermindering energiebelasting</td><td>635.19</td><td>In €/year</td></tr><tr><td>feed_in_compensation</td><td>float</td><td>Earnings per kwh fed back in the grid</td><td>0.1331</td><td>In €/kWh</td></tr><tr><td>feed_in_cost</td><td>float</td><td>Cost per kwh fed back in the grid</td><td>0.125</td><td>In €/kWh</td></tr><tr><td>fixed_solar_panel_cost</td><td>float</td><td>Yearly extra charge from electricity supplier if you have solar panels</td><td>0</td><td>In €/year</td></tr><tr><td>netting_percentage</td><td>float</td><td>The fraction of produced electricity that is returned to the grid (and will count towards salderingsregeling.</td><td>0.65</td><td>%</td></tr><tr><td>gas_yearly_price_increase</td><td>float</td><td>Expected percentage increase in gas price</td><td>0.03</td><td>%</td></tr><tr><td>electricity_yearly_price_increase</td><td>float</td><td>Expected percentage increase in electricity price</td><td>0.02</td><td>%</td></tr><tr><td>external_heating_yearly_price_increase</td><td>float</td><td>Expected percentage increase in external heating price</td><td>0.03</td><td>%</td></tr><tr><td>term</td><td>integer</td><td>The term in years used for calculation return on investment</td><td>25</td><td>In year</td></tr><tr><td>discount_rate</td><td>float</td><td>Discount rate (~inflation) used in return on investment calculation</td><td>0.04</td><td>%</td></tr><tr><td>tax_rate</td><td>float</td><td>General VAT</td><td>1.21</td><td>%</td></tr><tr><td>custom_costs</td><td>dict</td><td>TBA</td><td>{}</td><td></td></tr></tbody></table>

#### Input schema

```
"cost_indicators": {
      {
        "name": value
      }}
```

#### Example

```
{
  "postcode": "2771DS",
  "housenumber": 87,
  "houseaddition": "",
  "cost_indicators": {
    "fixed_gas_price": 337.89,
    "variable_gas_price": 0.6595,
    "energy_tax_gas": 0.69957,
    "fixed_electricity_price": 575.76,
    "variable_electricity_price": 0.1470,
    "energy_tax_electricity": 0.12286,
    "fixed_heat_price": 760.77,
    "energy_tax_heat": 0,
    "variable_heat_price": 43.79,
    "tax_credit": 635.19,
    "feed_in_compensation": 0.1331,
    "feed_in_cost": 0.125,
    "fixed_solar_panel_cost": 0,
    "netting_percentage": 0.65,
    "gas_yearly_price_increase": 0.03,
    "electricity_yearly_price_increase": 0.02,
    "external_heating_yearly_price_increase": 0.03,
    "term": 25,
    "discount_rate": 0.04,
    "tax_rate": 1.21
  }
}
```