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Income taxes (Tables)
9 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Schedule of provision for income tax expense
                    
   Three Months Ended March 31,   Nine Months Ended March 31, 
   2022   2021   2022   2021 
Current:                    
Federal  $402,373   $198,079   $859,341   $555,430 
State   67,642    92,681    276,364    258,204 
PRC   122,623        122,623     
Total current income tax provision   592,638    290,760    1,258,328    813,634 
Deferred:                    
Federal   (432,290   (36,221   (432,290   (36,221
State   (120,493   (16,726   (120,493   (16,726
PRC                 
Total deferred tax   (552,783   (52,947   (552,783   (52,947
Total provision for income taxes  $39,855    $237,813   $705,545   $760,687 
Schedule of reconciliation of effective income tax rate
                    
    Three Months Ended March 31,    Nine Months Ended March 31, 
    2022    2021    2022    2021 
US calculated statutory tax rate                    
Federal   21.00%    21.00%    21.00%    21.00% 
State (net of federal benefit)   5.45%    8.84%    5.71%    8.84% 
Foreign tax rate difference   (1.59%)       (0.54%    
Net effect of state income tax deduction and other                    
Permanent and temporary differences   (21.59%   737.57%    (6.40%   10.38% 
Effective tax rate   3.27%     767.41%    19.77%    40.22%