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Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of provision for income taxes
   For the years ended December 31, 
   2021   2020   2019 
             
Current  $135   $109   $11,164 
Deferred   (174,076)   (80,641)   (224,511)
Total income tax (benefits) expenses  $(173,941)  $(80,532)  $(213,347)

 

Schedule of effective tax rate
   For the years ended December 31, 
   2021   2020   2019 
             
PRC statutory rates   25.0%   25.0%   25.0%
Preferential tax rates   (25.8)%   (25.0)%   (16.9)%
R&D credits   3.0%   1.7%   (3.4)%
Change in valuation allowance and others   (0.4)%   (1.3)%   (2.8)%
Effective tax rate   1.8%   0.4%   1.9%

 

Schedule of deferred tax assets
   As of December 31, 
   2021   2020 
         
Deferred tax assets:          
Provision for doubtful accounts  $455,343   $302,536 
Depreciation and amortization   145,928    112,595 
Net operating loss carryforward   738,187    517,537 
Valuation allowance   (738,187)   (517,537)
Total deferred tax assets  $601,271   $415,131 

 

Schedule of taxes payable
   As of December 31, 
   2021   2020 
         
Income taxes payable  $594,026   $565,506 
VAT and other tax payable   136,898    133,429 
Totals  $730,924   $698,935