are these two terms the same? I always see sth is not taxable, or sth is not tax deductible, not sure if they mean the same thing.
They are different. Taxable means the activity or income is subject to tax. In some countries certain revenues or incomes are exempt from tax. Tax deductible means that the expense, expenditure or cost is allowable for tax purposes. In other words deductible means that you will be allowed to deduct that expense from total taxable revenue before arriving at net income for tax purposes. Did this help?
that clears things up, thanks for your help!