@Justinmcken
Do you also have US social security? Or are you just asking about the Irish payments?
Generally, if you have US social security in the mix, married filing separately is the worst status because of how the spouse's US social security benefits are taxed. When you are married filing separately, 85% of US social security benefit is automatically taxed from the first dollar. You can't file as "single" if you are married.
I also want to address the comments of my excellent colleague @pk . Because the Irish payments are taxed only in the US, but there is no mechanism in Turbotax to apply the US social security rules to the Irish benefit payments, you would have to declare the payment as a general pension using a substitute 1099-R. That makes the Irish benefit 100% taxable no matter what filing status you use. If you want to try to apply US social security tax calculations to the Irish benefit, you will need to hire a tax professional to help you with that, if it is even possible.
