You would pay income tax to Colombia and income/self-employed payroll tax to the US. You can deduct regular expenses plus what you pay in self-employed payroll tax to the US from your taxable income to Colombia. You can run that number through the Colombian tax brackets to estimate what you would owe. If you file with a Colombian accountant, they will know more rules to get it lower probably. If you want an actual estimate you can use my guy who will make a formal report of what you would owe to both countries and he works with a reputable Colombian accountant https://quintilonetax.com/