In Trinidad and Tobago, Sole Traders pays the following taxes:
Income Tax which is 25% on profit
Health Surcharge which is $429 per year for 52 weeks and $437.25 per year for 53 weeks
Business Levy which is .6% on income earned for the year.
They are paid every quarter on March 30th, June 30th, September 30th and December 31st.
NOTE: If you work 8 to 4, you must combine the two incomes earned.