Please specify exactly which one-time assistance you mean.
In case of service of 10 calendar years or more, a one-time cash benefit is paid in the amount of 50% of the monthly cash allowance for each full calendar year of service. This assistance is provided in the following cases:
by age;
in connection with the reduction of staff or organizational measures;
upon expiry of the contract;
in connection with direct subordination to a close person;
systematic failure to fulfill the terms of the contract by the command;
in connection with the onset of a special period and reluctance to continue military service by a female serviceman who has a child (children) under the age of 18.
A one-time cash allowance in the amount of 25 percent of the monthly cash allowance for each full calendar year of service is paid:
to officers who undergo personnel military service and resign at their own will;
to other military personnel who are released from service due to family circumstances or for other valid reasons, specified in the List of family circumstances and other valid reasons, which was approved by Resolution No. 413 of the Cabinet of Ministers of Ukraine dated June 12, 2013, and at the same time have service of 10 calendar years or more.
Income from abroad, like Ukrainian wages, is subject to taxation at the rate of 18%, and the military levy — 1.5%.
The income received during the year abroad must be reflected in the tax declaration. This declaration must be submitted by May 1 of the following year (clause 170.11 of the Code of Civil Procedure).
When filling out the tax return, you must specify:
received foreign salary in line 10.7 "Income received from sources outside Ukraine";
the country from which the income was received;
the currency in which it was paid;
the amount of income in hryvnias at the NBU exchange rate effective at the time of receipt of such income (clause 164.4 of the Code of Civil Procedure).
If taxes were already levied on the income while receiving it abroad, you can reduce the amount of personal income tax that must be paid in Ukraine by the amount of such taxes (paragraph 170.11.2 of the PKU).
Please tell me what you mean by the term "social body"?
If you believe that the pension authorities are not paying you the full amount of your pension, you can apply for a pension recalculation, in accordance with the procedure specified in Chapter VI of the Law of Ukraine "On Mandatory State Pension Insurance".