This is the position for US citizens living in Ireland with an Irish pension. Since the IRS taxes US citizens on their worldwide income irrespective of where they live, it’s reasonable to assume that the rules are going to be the same for a resident alien.
Pension planning
Under the United States and the Irish Income Tax Treaty a US citizen employed in Ireland and participating in a pension plan established by the Irish employer, the rules are that the employee may deduct (or exclude) contributions made by or on behalf of the individual to the plan; and benefits accrued under the plan are not taxable income. The Treaty further provides that the deduction (or exclusion) rule only applies to the extent the contributions or benefits qualify for tax relief in Ireland and that such relief may not exceed the reliefs that would be allowed in the US under its domestic rules.
Distributions or lump sum payments from a pension to the U.S. residents living in Ireland are subject to taxation in the U.S. based on the “Saving clause” in the Ireland-U.S. Tax Treaty Article 1:
“Notwithstanding any provision of the Convention, a Contracting State may tax its residents (as determined under Article 4 (Residence)), and by reason of citizenship may tax its citizens, as if the Convention had not come into effect”
(
http://www.irs.gov/pub/irs-trty/ireland.pdf)
To avoid double taxation, the United States allows a credit against United States tax through tax paid to Ireland on the same income
So I use something like the PWC income tax calculator to work out the Irish tax due on a given gross pension income
The provisions of Budget 2025 have been announced. Use our interactive calculator to work out your income tax liability for the year ahead.