Note 10—Income Taxes


The (loss) income before income taxes and the related expense (benefit) are as follows (in thousands):

 
Years Ended March 31,
 
  2025  
2024
 
2023
 
(Loss) income before income taxes:
           
Bermuda(1)
  $ (80,590 )  
$
5,189,812
   
$
(40,738
)
United States
    (174,763 )    
(232,592
)
   
(437,944
)
Switzerland
    (426,478 )    
(389,948
)
   
(402,611
)
Other
    241      
584
     
(3,697
)
Total (loss) income from continuing operations before income taxes
  $ (681,590 )  
$
4,567,856
   
$
(884,990
)

(1)
Primarily entities which are centrally managed and controlled in the U.K. and are subject to U.K. taxes.

   
Years Ended March 31,
 
    2025
   
2024
   
2023
 
Current taxes:
                 
Bermuda
  $
   
$
   
$
 
United States(1)
    48,174      
21,813
     
4,204
 
Switzerland
         
     
 
Other
         
(310
)
   
(122
)
Total current tax expense
  $
48,174    
$
21,503
   
$
4,082
 
Deferred taxes:
                       
Bermuda
  $
   
$
   
$
 
United States
         
     
 
Switzerland
         
     
 
Other
         
     
 
Total deferred tax benefit
  $
   
$
   
$
 
Total income tax expense
  $
 48,174
   
$
21,503
   
$
4,082
 

(1) Inclusive of the state and local income taxes.


A reconciliation of income tax expense computed at the Bermuda statutory rate to income tax expense reflected in the consolidated financial statements is as follows (in thousands, except percentages):

    Year Ended
    Year Ended     Year Ended  
    March 31, 2025
   
March 31, 2024
   
March 31, 2023
 
Income tax expense at Bermuda statutory tax rate
  $       %
 
$
     
%
 
$
     
%
Foreign rate differential(1)
    (112,413 )     16.49 %    
1,196,877
     
26.20
%
   
(163,093
)
   
18.43
%
Permanent disallowed IPR&D
          %
   
     
%
   
17,714
     
(2.00
)%
Tax effect of changes in the fair value of investments and loss from equity method investments
    (12,813 )     1.88 %    
15,431
     
0.34
%
   
4,118
     
(0.47
)%
Substantial shareholding exemption
    (27,597 )     4.05 %     (1,337,102 )     (29.27 )%           %
Nondeductible executive compensation
    54,558       (8.00 )%    
19,727
     
0.43
%
   
20,558
     
(2.32
)%
Tax deficiencies (excess tax benefits) from stock-based compensation
    (16,676 )     2.45 %    
(21,668
)
   
(0.47
)%
   
3,311
     
(0.37
)%
Other permanent adjustments
    37,096       (5.44 )%    
40,085
     
0.88
%
   
12,065
     
(1.36
)%
Research tax credits
    (31,840 )     4.67 %    
(22,863
)
   
(0.50
)%
   
(12,217
)
   
1.38
%
Valuation allowance
    134,855       (19.79 )%    
43,754
     
0.96
%
   
108,000
     
(12.20
)%
Reversal of certain deferred tax assets(2)
    25,062       (3.68 )%     87,262       1.90 %     11,630       (1.32 )%
Other
    (2,058 )     0.30 %    
     
%
   
1,996
     
(0.23
)%
Total income tax expense
  $ 48,174       (7.07 )%  
$
21,503
     
0.47
%
 
$
4,082
     
(0.46
)%

(1)
Primarily related to operations in the U.S., Switzerland, the U.K., and other jurisdictions with statutory tax rates different than the Bermuda rate.
(2)
Primarily relates to deferred tax assets associated with entities no longer included in the consolidated financial statements (i.e., sold, deconsolidated or liquidated) and Switzerland expiring net operating losses.


The Company’s effective tax rate for the years ended March 31, 2025, 2024 and 2023 was (7.07)%, 0.47% and (0.46)%, respectively. The effective tax rate for the year ended March 31, 2025 is driven by earnings by jurisdiction and a valuation allowance that eliminates the Company’s global net deferred tax assets. The effective tax rate for the year ended March 31, 2024 is driven by the Company’s gain on sale of Telavant net assets, which qualifies for the substantial shareholding exemption in the U.K. and consequently is not subject to the corporation income tax, as well as earnings by jurisdiction and a valuation allowance that eliminates the Company’s global net deferred tax assets. The effective tax rate for the year ended March 31, 2023 is driven by the earnings by jurisdiction and a valuation allowance that eliminates the Company’s global net deferred tax assets.


Deferred taxes reflect the tax effects of the differences between the amounts recorded as assets and liabilities for financial reporting purposes and the comparable amounts recorded for income tax purposes. Significant components of the deferred tax assets (liabilities) at March 31, 2025 and 2024 are as follows (in thousands):

   
March 31, 2025
   
March 31, 2024
 
Deferred tax assets
           
Research tax credits
  $ 54,101     $ 39,536  
Intangible assets
    16,939       18,167  
Capitalized research and development
    41,387       32,124  
Net operating loss
    469,339       359,971  
Share-based compensation
    103,515       95,624  
Lease liabilities
    21,687       12,229  
Other assets
    18,001       14,256  
Subtotal
    724,969       571,907  
Valuation allowance
    (701,219 )    
(558,868
)
                 
Deferred tax liabilities
               
Depreciation
    (561 )     (645 )
Right-of-use assets
    (19,270 )     (10,008 )
Other liabilities
    (3,919 )     (2,386 )
Total deferred tax assets/(liabilities)
  $     $  


The Company has net operating losses in Switzerland, the U.S. and the U.K. in the amount of $2,582.9 million, $223.3 million and $342.0 million, respectively. The Switzerland net operating losses will expire in varying amounts between March 31, 2026 and March 31, 2032. The U.S. net operating losses can be carried forward indefinitely with utilization limited to 80% of future taxable income for tax years beginning on or after January 1, 2021, while the U.K. and other net operating losses can be carried forward indefinitely as well, with an annual limitation on utilization. The Company has $47.1 million of federal research tax credit carryforwards in the U.S., which will expire in varying amounts between March 31, 2039 and March 31, 2045. Additionally, credits of $7.0 million are related to various states and Canada.


The Company assesses the realizability of the deferred tax assets at each balance sheet date based on available positive and negative evidence in order to determine the amount which is more likely than not to be realized and record a valuation allowance as necessary. Due to the Company’s cumulative loss position which provides significant negative evidence difficult to overcome, the Company has recorded a valuation allowance of $701.2 million as of March 31, 2025, representing the portion of the deferred tax asset that is not more likely than not to be realized. For the period April 1, 2024 through March 31, 2025, the valuation allowance increased by $142.4 million, primarily as a result of corresponding increases in our global net operating losses. The amount of the deferred tax asset considered realizable could be adjusted for future factors that would impact the assessment of the objective and subjective evidence of the Company. The Company will continue to assess the realizability of deferred tax assets at each balance sheet date in order to determine the amount, if any, required for a valuation allowance.


There are outside basis differences related to the Company’s investment in subsidiaries for which no deferred taxes have been recorded, as these would not be subject to tax on repatriation, as Bermuda has no tax regime for Bermuda exempted limited companies, and the U.K. tax regime relating to company distributions and sales generally provides for exemption from tax for most overseas profits, subject to certain exceptions.


The Company is subject to tax and is required to file U.S., U.K. and Switzerland federal income tax returns, as well as income tax returns in various state, local and foreign jurisdictions. The Company is subject to tax examinations for tax years ended March 31, 2019 and forward in major taxing jurisdictions. Tax audits and examinations can involve complex issues, interpretations and judgments. The resolution of matters may span multiple years particularly if subject to litigation or negotiation. The Company believes it has appropriately recorded its tax position using reasonable estimates and assumptions, however, the potential tax benefits may impact the results of operations or cash flows in the period of resolution, settlement or when the statutes of limitations expire.


The Company’s unrecognized tax benefit activity during the years ended March 31, 2025, 2024 and 2023 were not material to the Company’s consolidated financial statements. No interest and penalties related to unrecognized tax benefits were recorded as of March 31, 2025, 2024 or 2023.
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Historical Timeline

Fiscal YearFiled
2025May 29, 2025Showing above
2024May 30, 2024
2023Jun 28, 2023

About Income Taxes Disclosures

The income tax disclosure reveals how much a company actually pays in taxes versus what the statutory rate would predict. Analysts focus on the effective tax rate (ETR) reconciliation, which breaks down every item driving the gap between the 21% federal rate and the company's reported ETR — including R&D credits, foreign rate differentials, and state taxes. Deferred tax assets (DTAs) and their valuation allowances signal management's confidence in future profitability: a rising allowance suggests the company doubts it can use accumulated tax benefits. Uncertain tax benefit (UTB) reserves quantify exposure to IRS challenges on aggressive positions.

Key signals to watch: sudden ETR drops without clear operational reasons, large increases in valuation allowances, growing UTB balances, and significant unremitted foreign earnings. Post-TCJA, pay attention to GILTI and BEAT provisions that affect multinational tax structures. Compare the cash taxes paid (from the cash flow statement) against the income tax provision to gauge earnings quality.