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Income taxes (Tables)
12 Months Ended
Dec. 31, 2019
Components of income tax expense / (credit)
    Year ended December 31,  
    2019     2018     2017  
    US$’000     US$’000     US$’000  
Current taxes expense                  
Hong Kong profits tax and the PRC EIT     -       (346 )     -  
Income tax credit     -       (346 )     -  
                         
Deferred tax expenses                        
Hong Kong and the PRC     37       34       28  
Total deferred tax expense     37       34       28  
                         
Total expense / (credit)     37       (312 )     28  
Reconciling items from income tax
    Year ended December 31,  
    2019     2018     2017  
    US$’000     US$’000     US$’000  
                   
Loss before income taxes     (310 )     (963 )     (564 )
Computed tax using respective companies’ statutory tax rates     (69 )     (254 )     (94 )
Change in valuation allowances     (30 )     68       120  
Under / (over-provision) for income taxes in prior years     5       (131 )     -  
Non-deductible expenses     131       5       2  
Income taxes expense / (credit) at effective tax rate     37       (312 )     28  
Components of deferred tax assets
    December 31,  
    2019     2018  
    US$’000     US$’000  
             
Tax losses     858       975  
Temporary differences     (19 )     (17 )
Less: Valuation allowances     (752 )     (834 )
Net deferred tax assets     87       124  
ZHEJIANG TIANLAN  
Components of income tax expense / (credit)
    Year ended December 31,  
    2019     2018     2017  
    RMB’000     RMB’000     RMB’000  
                   
                   
Current tax expense                  
PRC EIT     28       2       4,237  
                         
Income tax expense     28       2       4,237  
                         
                         
Deferred tax expense/(credit)     268       (7,969 )     (405 )
                         
Total deferred tax expense/(credit)     268       (7,969 )     (405 )
                         
Total expense/(credit)     296       (7,967 )     3,832  
Reconciling items from income tax
    Year ended December 31,  
    2019     2018     2017  
    RMB’000     RMB’000     RMB’000  
                   
Income/(loss) before income tax     4,654       (34,194 )     30,047  
Computed tax using respective companies’ statutory tax rates     642       (4,987 )     4,548  
(Over)-provision for income tax in prior years     -       -       (29 )
Permanent difference     -       -       (459 )
Temporary differences     202       (272 )     (405 )
Tax effect of revenue not subject to tax     -       (3,024 )     (1,438 )
Tax effect of expenses not deductible for tax purposes     693       316       1,435  
Tax effect of unused tax losses not recognized     -       -       180  
Tax effect of special deduction for research and development costs     (2,103 )     -       -  
Others     862       -       -  
Income taxes expense/(credit) at effective tax rate     296       (7,967 )     3,832  
Components of deferred tax assets
    December 31,  
    2019     2018  
    RMB’000     RMB’000  
             
Allowance for doubtful accounts     7,464       13,201  
Impairment losses on assets     5,025       -  
Tax losses     1,481       1,037  
                 
Total deferred tax assets     13,970       14,238