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Taxes (Tables)
12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of provision for income taxes
  For the years ended December 31, 
   2018   2017   2016 
             
Current   113,088    406,975    543,914 
Deferred   (69,898)   27,907    (7,527)
Total provision for income taxes  $43,190   $434,882   $536,387 
Schedule of effective tax rate
  For the years ended December 31, 
   2018   2017   2016 
             
PRC statutory rates   25.0%   25.0%   25.0%
Preferential tax rates   (9.9)%   (15.0)%   (10.0)%
R&D credits   (12.7)%   (2.0)%   (1.8)%
Permanent difference and others   0.3%   2.0%   0.2%
Effective tax rate  $2.7%  $10.0%  $13.4%
Schedule of deferred tax assets
  As of December 31, 
   2018   2017 
         
Deferred tax assets:          
Provision for doubtful accounts  $37,042   $5,571 
Depreciation and amortization   50,374    15,800 
Total deferred tax assets  $87,416   $21,371 
Schedule of taxes payable
  As of December 31, 
   2018   2017 
         
Income taxes payable  $642,215   $864,807 
VAT and other tax payable   225,395    388,438 
Totals  $867,610   $1,253,245