English to Hungarian Bus/Financial Economics

Itt ki kell hangsuulyoznom, hogy amerikai adozasi gyakorlatrol beszelunk, nem magyarrol, vagy europairol, azonban a szoveg tobb orszagra is utal.
A "social secutiry contributions" ugye egyertelmu, hogy tarsadalombiztositasi hozzajarulasokat jeloli.
Jomagam, tevesen vagy sem, ugyanannak vettem a kettot sokaig, de elbizonytalanodtam. Tobb anyagban (Europai adozassal kapcsolatos anyagokban) ugyanarra utal mnindket kifejezes.

A kerdesem (ha valaki jaratos USA adozasban), hogy ott a ket kifejezes ket kulon dologra utal? Es ha igen mi lenne az, ergo mi a kulonbseg a ketto kozt?

Forditsam a "social tax" kifejezest "szocialis ado"-kent netan? (bar nem teljesen vilagos mit takarna ebben az esetben)

Context:
Topic: equity administration /vallalati reszveny juttatasokkal kapcsolatban/

-Income and/or social tax withholding obligation vs. no withholding obligation
-The amount of income and/or social tax(es) withholding required varies by the country and may be different for restricted stock/deferred stock units, performance share units and for stock options.
-The amount of income and/or social tax(es) withheld may not be sufficient to satisfy all tax obligations with respect to a transaction.
-Payment and/or reporting of withheld income tax / social security contributions to local tax authorities
-The income and/or social taxes withheld from the employee are based upon where the employee is physically located during the taxation period.
-If an employee moves locations during the taxation period, the income and/or social tax withholding rate(s) will be time apportioned across the taxation period (see “Time Apportionment” section).