Ireland: USC and PRSI are not the same thing on your US return.
There is a US–Ireland income tax treaty and a totalization agreement. Irish deductions come in three parts, and they are not treated alike: income tax and the Universal Social Charge are income taxes for credit purposes, while PRSI is social insurance and belongs to the totalization agreement instead.
Tax snapshot — Ireland
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Sources: IRS Publication 54; IRS Publication 901; US–Ireland income tax treaty (1997); US–Ireland totalization agreement (1993); IRC §1291–1298; Rev. Proc. 2025-32. Checked 28 August 2026.
What that means on your return
Splitting the payslip correctly is most of the work. USC is an income tax and goes on Form 1116; PRSI is social security and does not. Treating the whole deduction as one number either overstates the credit or throws away part of it.
Irish and UCITS funds are usually passive foreign investment companies. A perfectly ordinary Irish investment account can therefore carry Form 8621 and a default calculation designed to be unattractive.
The totalization agreement covers PRSI, so a self-employed American contributing in Ireland generally avoids the 15.3% US self-employment charge, on a certificate of coverage.
If you are in Ireland as a…
Questions I get about Ireland
Are USC and PRSI creditable on my US return?
USC generally is — it is an income tax. PRSI is not: it is social insurance, addressed through the totalization agreement rather than Form 1116.
Are Irish investment funds a problem for a US filer?
Usually yes. Irish and UCITS funds are typically PFICs, which brings Form 8621 and an unfavourable default calculation unless an election is made in time.
I already pay high tax in Ireland. Do I still file a US return?
Yes, every year. Citizenship-based taxation does not care what you pay locally. The foreign tax credit usually removes the US liability, but the filing obligation stands, and FBAR and FATCA reporting stand with it.
When is my return due?
15 June, under the automatic extension for filers living abroad. Form 4868 moves it to 15 October, and I file the extension free.
Do I have to file an FBAR for my Irish bank account?
If your foreign accounts together passed $10,000 at any point in the year, yes. You can file it free through FinCEN's own system. The non-willful penalty for not filing is $16,536.
I have not filed for several years. What now?
The Streamlined Foreign Offshore Procedures: three returns, six FBARs and Form 14653 certifying non-willfulness. Penalties are waived. Note that the IRS terminated the separate Delinquent FBAR Submission Procedures around 1 July 2026.
Filing from Ireland this year?
Twenty minutes with the Enrolled Agent who will prepare and sign it. Complete return, $599.
An IRS Enrolled Agent working only on US tax for Americans living abroad. I prepare and sign every return myself — 17 years in practice, 12 of them as an Enrolled Agent.