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Taxes (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of provision for income taxes

   For the years ended December 31, 
   2019   2018   2017 
             
Current  $11,164   $113,088   $406,975 
Deferred   (224,511)   (69,898)   27,907 
Total income tax (benefits) expenses  $(213,347)  $43,190   $434,882 
Schedule of effective tax rate

   For the years ended December 31, 
   2019   2018   2017 
             
PRC statutory rates   25.0%   25.0%   25.0%
Preferential tax rates   (16.9)%   (9.9)%   (15.0)%
R&D credits   (3.4)%   (12.7)%   (2.0)%
Change in valuation allowance and others   (2.8)%   0.3%   2.0%
Effective tax rate   1.9%   2.7%   10.0%
Schedule of deferred tax assets

   As of December 31, 
   2019   2018 
         
Deferred tax assets:        
Provision for doubtful accounts  $255,119   $37,042 
Depreciation and amortization   53,992    50,374 
Net operating loss carryforward   272,815    - 
Valuation allowance   (272,815)   - 
Total deferred tax assets  $309,111   $87,416 
Schedule of taxes payable

   As of December 31, 
   2019   2018 
         
Income taxes payable  $539,437   $642,215 
VAT and other tax payable   330,476    225,395 
Totals  $869,913   $867,610