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Note 12 - Income Taxes (Tables)
12 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 
  

2023

  

2022

  

2021

  

2023

  

2022

  

2021

  

2023

  

2022

  

2021

 

Federal:

                                    

Current

 $0.7  $0.5  $0.2  $  $  $  $  $  $ 

Deferred

  30.4   47.0   49.5   10.1   18.2   22.0   15.8   18.1   19.8 

Investment tax credits

  (0.2)  (0.2)  (0.2)  (0.2)  (0.2)  (0.2)         

State and local:

                                    

Current

  1.2   0.5   1.3                   

Deferred

  6.7   11.1   17.7   1.7   3.3   3.5   4.5   5.1   5.2 

Total income tax expense

 $38.8  $58.9  $68.5  $11.6  $21.3  $25.3  $20.3  $23.2  $25.0 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 
  

2023

  

2022

  

2021

  

2023

  

2022

  

2021

  

2023

  

2022

  

2021

 

Federal income tax statutory rate

  21.0%  21.0%  21.0%  21.0%  21.0%  21.0%  21.0%  21.0%  21.0%

State and local income taxes, net of federal income tax benefits

  3.7   3.6   3.6   2.6   2.6   2.6   4.1   4.1   4.1 

Certain expenses capitalized on books and deducted on tax return

  (1.4)  (1.6)  (1.6)  (2.7)  (3.2)  (3.3)         

Taxes related to prior years

     (0.3)  (0.5)     (0.6)  (0.2)         

Tax credits *

  (3.3)        (4.2)        (1.9)      

Amortization of excess deferred taxes

  (5.1)  (3.5)  (2.5)  (7.7)  (7.3)  (5.0)  0.2       

Other items – net **

  0.2   1.9   0.1      3.1   (0.2)  0.1   0.2   0.2 

Effective income tax rate

  15.1%  21.1%  20.1%  9.0%  15.6%  14.9%  23.5%  25.3%  25.3%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 
  

2023

  

2022

  

2023

  

2022

  

2023

  

2022

 

Deferred tax assets:

                        

Reserves not currently deductible

 $27.7  $33.5  $  $4.0  $3.9  $7.4 

Pension and other postretirement benefits

  64.4   72.6   44.7   52.6   17.0    

Goodwill

              58.8   73.0 

Operating losses

  239.2   255.1   89.2   116.9   159.8   140.3 

Regulatory amount due to customers, net

  30.4   34.5   27.6   30.7       

Other

  35.8   24.9   10.5      3.0    

Total deferred tax assets

  397.5   420.6   172.0   204.2   242.5   220.7 

Deferred tax liabilities:

                        

Relating to property

  (788.0)  (740.0)  (507.7)  (489.3)  (218.7)  (201.6)

Regulatory pension and other postretirement benefits

  (80.6)  (92.8)  (53.0)  (72.3)  (25.9)  (1.6)

Deferred gas costs

  (67.0)  (75.8)  (64.1)  (74.0)      

Other ***

  (205.6)  (187.1)  (79.0)  (68.7)  (7.0)  (6.5)

Total deferred tax liabilities

  (1,141.2)  (1,095.7)  (703.8)  (704.3)  (251.6)  (209.7)

Net deferred tax (liability) asset

 $(743.7) $(675.1) $(531.8) $(500.1) $(9.1) $11.0 
Summary of Federal and State Loss and Contribution and Tax Credit Carryforwards[Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 

Federal and state loss carryforwards

 $1,000.3  $352.4  $624.1 

Contribution carryforwards

  6.1   5.6   - 

Tax credit carryforwards

  13.1   8.5   1.6 
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
  

Spire

  

Spire Missouri

  

Spire Alabama

 
  

2023

  

2022

  

2021

  

2023

  

2022

  

2021

  

2023

  

2022

  

2021

 

Unrecognized tax benefits, beginning of year

 $19.6  $16.4  $13.2  $19.3  $16.1  $13.0  $  $  $ 

Increases related to tax positions taken in current year

  4.2   3.3   3.2   3.6   3.2   3.1   0.3       

Reductions due to lapse of applicable statute of limitations

     (0.1)                     

Unrecognized tax benefits, end of year

 $23.8  $19.6  $16.4  $22.9  $19.3  $16.1  $0.3  $  $