It's really a convoluted mess. I would imagine that there are a few members of this community who have both US and Dominican incomes. If one is a US citizen, he will not have to pay US income tax on Dominican wages up to $USD 97,600 earned per year. He can, though, expect to pay Social Security and Medicare on his Dominican income up to 15.3 percent (he will pay the full 15.3 percent if he is a 1099 employee in the States). He will then pay US income tax on his US income and Social Security/Medicare on his US Income, as well. Such is the case for me. I will have to pay Dominican income tax and US Social Security/Medicare on my Dominican income and US income tax and Social Security/Medicare on my US income. I'm a 1099 employee. Oh the joy!!!
I spent some time researching this, and I spoke to a very learned and knowledgeable accountant who informed me of this. I hope to be pleasantly surprised at tax season, but I'm not holding my breath. What I am (with)holding is enough to cover what I anticipate my tax liability will be so that when the time comes, I'll either be pleasantly surprised or not surprised at all. I hope this contribution to the thread helps. Bendiciones.