@ph0429 , since you plan to "probably" retire in the UK , contributing to UK national health etc. and UK/US having a totalization agreement in place, you can avoid paying the SECA at 15.3% on your net income, by including in your US filing a UK certificate of participation to the IRS. Please see page from IRS:
www.irs.gov and search for Totalization agreement
"Covered by foreign country only. If the employee is an alien who wishes to claim an exemption from U.S. Social Security taxes and Medicare taxes because of a Totalization Agreement he/she must secure a Certificate of Coverage from the social security agency of his home country and present such Certificate of Coverage to his employer in the United States, according to the procedures set forth in Revenue Procedures 80-56, 84-54, and Revenue Ruling 92-9. An alternate procedure is provided in these revenue procedures for an alien who is unable to secure a Certificate of Coverage from his home country.
If the employee is a U.S. citizen or U.S. resident alien and they are working in a foreign country with which the United States has a Totalization Agreement, and under the Totalization Agreement, pay is exempt from U.S. Social Security tax, the employee or employer should get a statement from the authorized official or agency of the foreign country verifying that the wages are subject to social security coverage in that country.
If the authorities of the foreign country will not issue such a statement, either the employee or the employer should get a statement from the U.S. Social Security Administration, Office of International Programs. The statement should indicate that the wages are not covered by the U.S. Social Security."
This statement should be kept by the employer because it establishes that this employee’s pay is exempt from U.S. Social Security tax.
Only wages paid on or after the effective date of the Totalization Agreement can be exempt from U.S. Social Security tax".
Hope this answers your query. If it does then please "accept" the answered so the thread gets closed.
Is there more I can do for you?
pk
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.