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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2022
Income Taxes [Line Items]  
Schedule Of Effective Income Tax Rates Overall effective income tax rates, which were computed by dividing income tax expense (benefit) by income before income taxes, were as follows. The effective income tax rates were different than the federal statutory rate primarily due to state income taxes, production tax credits, amortization of excess deferred taxes and the effect of rate-making on property-related differences. The increases in Alliant Energy’s and WPL’s overall effective income tax rates for the three
and six months ended June 30, 2022 compared to the same periods in 2021 were primarily due to decreased amortization of excess deferred taxes primarily at WPL.
Alliant EnergyIPLWPL
Three MonthsSix Months Three MonthsSix Months Three MonthsSix Months
202220212022202120222021202220212022202120222021
Overall income tax rate2%(13%)3%(16%)(16%)(13%)(15%)(15%)18%(23%)18%(27%)
Summary Of Tax Credit Carryforwards At June 30, 2022, carryforwards and expiration dates were estimated as follows (in millions):
Range of Expiration DatesAlliant EnergyIPLWPL
Federal net operating losses2037$41$38$—
State net operating losses2022-2042556102
Federal tax credits2022-2042620396201
IPL [Member]  
Income Taxes [Line Items]  
Schedule Of Effective Income Tax Rates Overall effective income tax rates, which were computed by dividing income tax expense (benefit) by income before income taxes, were as follows. The effective income tax rates were different than the federal statutory rate primarily due to state income taxes, production tax credits, amortization of excess deferred taxes and the effect of rate-making on property-related differences. The increases in Alliant Energy’s and WPL’s overall effective income tax rates for the three
and six months ended June 30, 2022 compared to the same periods in 2021 were primarily due to decreased amortization of excess deferred taxes primarily at WPL.
Alliant EnergyIPLWPL
Three MonthsSix Months Three MonthsSix Months Three MonthsSix Months
202220212022202120222021202220212022202120222021
Overall income tax rate2%(13%)3%(16%)(16%)(13%)(15%)(15%)18%(23%)18%(27%)
Summary Of Tax Credit Carryforwards At June 30, 2022, carryforwards and expiration dates were estimated as follows (in millions):
Range of Expiration DatesAlliant EnergyIPLWPL
Federal net operating losses2037$41$38$—
State net operating losses2022-2042556102
Federal tax credits2022-2042620396201
WPL [Member]  
Income Taxes [Line Items]  
Schedule Of Effective Income Tax Rates Overall effective income tax rates, which were computed by dividing income tax expense (benefit) by income before income taxes, were as follows. The effective income tax rates were different than the federal statutory rate primarily due to state income taxes, production tax credits, amortization of excess deferred taxes and the effect of rate-making on property-related differences. The increases in Alliant Energy’s and WPL’s overall effective income tax rates for the three
and six months ended June 30, 2022 compared to the same periods in 2021 were primarily due to decreased amortization of excess deferred taxes primarily at WPL.
Alliant EnergyIPLWPL
Three MonthsSix Months Three MonthsSix Months Three MonthsSix Months
202220212022202120222021202220212022202120222021
Overall income tax rate2%(13%)3%(16%)(16%)(13%)(15%)(15%)18%(23%)18%(27%)
Summary Of Tax Credit Carryforwards At June 30, 2022, carryforwards and expiration dates were estimated as follows (in millions):
Range of Expiration DatesAlliant EnergyIPLWPL
Federal net operating losses2037$41$38$—
State net operating losses2022-2042556102
Federal tax credits2022-2042620396201