XML 49 R30.htm IDEA: XBRL DOCUMENT v3.23.3
Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2023
Income Taxes [Line Items]  
Schedule Of Effective Income Tax Rates Overall effective income tax rates for the three and nine months ended September 30, 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.
Alliant EnergyIPLWPL
Three MonthsNine Months Three MonthsNine Months Three MonthsNine Months
202320222023202220232022202320222023202220232022
Overall income tax rate2%6%1%4%(22%)(12%)(20%)(14%)16%15%15%17%
Summary Of Tax Credit Carryforwards At September 30, 2023, the carryforwards and expiration dates were estimated as follows (in millions):
Range of Expiration DatesAlliant EnergyIPLWPL
State net operating losses2025-2043$431$6$1
Federal tax credits2031-2043737520208
IPL [Member]  
Income Taxes [Line Items]  
Schedule Of Effective Income Tax Rates Overall effective income tax rates for the three and nine months ended September 30, 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.
Alliant EnergyIPLWPL
Three MonthsNine Months Three MonthsNine Months Three MonthsNine Months
202320222023202220232022202320222023202220232022
Overall income tax rate2%6%1%4%(22%)(12%)(20%)(14%)16%15%15%17%
Summary Of Tax Credit Carryforwards At September 30, 2023, the carryforwards and expiration dates were estimated as follows (in millions):
Range of Expiration DatesAlliant EnergyIPLWPL
State net operating losses2025-2043$431$6$1
Federal tax credits2031-2043737520208
WPL [Member]  
Income Taxes [Line Items]  
Schedule Of Effective Income Tax Rates Overall effective income tax rates for the three and nine months ended September 30, 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.
Alliant EnergyIPLWPL
Three MonthsNine Months Three MonthsNine Months Three MonthsNine Months
202320222023202220232022202320222023202220232022
Overall income tax rate2%6%1%4%(22%)(12%)(20%)(14%)16%15%15%17%
Summary Of Tax Credit Carryforwards At September 30, 2023, the carryforwards and expiration dates were estimated as follows (in millions):
Range of Expiration DatesAlliant EnergyIPLWPL
State net operating losses2025-2043$431$6$1
Federal tax credits2031-2043737520208