If both the U.S. and Hungarian Social Security systems cover a worker’s employment
or self-employment, the agreement provides that beginning September 1, 2016, only
one country’s system covers the worker’s employment or self-employment. The agreement
does not affect a worker’s coverage prior to that date. If a worker had dually covered
earnings before September 1, 2016, those earlier earnings were and would continue
to be subject to social security contributions in both countries.