How Tax Count for this case? My friend make about $5000 usd a month, who residing in Asia country, Singapore. His income is unstable as its depend greatly on the advertiser payment on time & their payment. I would ask how does tax count in his case, do he need to pay tax if he make about $3000 usd a month after minus the expenses incurred for his operation. What will happen if he doesn't pay the tax, will he get caught or what can he do, as he just reach the age of 21 which need to pay tax for revenue, does internet revenue through advertising banner place on website counts too? Hope to see some guide here. Thanks