Tax calculation varies country by country and every member of thirdSelf is subject to their local laws (the country and city of where they live) regarding tax accounting and administration. thirdSelf is not responsible for calculating your income taxes for you as per our Terms of Service.
In the USA: if your earnings are higher than $20,000 USD, thirdSelf will send you via Stripe a 1099 Tax document so you can use it on your W-2 statement (when you do your taxes every year).
For international users: thirdSelf will provide to you via Stripe your respective country's tax document. However, please note that this may not be the case and it is recommended that you keep track of your earnings and submit your income to your tax administrator.
Remember: paying taxes to your local government falls under your responsibility as a freelancer or individual. It is very important that you track the earnings that you receive and mark it as additional income (if you have another job) or as your main income if this is your main source of income.