Yes The A(M)RF funds are Liable to PAYE Tax and USC. This Income A(M)RF may also be subject to PRSI at the "S" Class rate, currently 4% until you reach State Pension Age, 66 currently. You also indicate that there are two other sources of income, Invalidity Pension & Public sector Pension. If the invalidity pension is from the private sector it will be subject to PAYE Tax and USC, it may also be liable to PRSI, Check your payslip,and see what is the class of PRSI applied, Class A or S 4%, class M 0%. If this income is from the public sector it will be subject to PAYE Tax, and may be liable to USC, again check payslip, The small public sector pension will have PAYE tax applied, and USC, and may or may not be subject to PRSI, again check pay slip for what is deducted.
It is worth noting that if your 2 existing incomes exceed €12,700.00c per annum (Current Legislation) The AMRF can be converted into an another ARF, and you are then not restricted to the 4% drawdown limit of an AMRF fund, In any case check your existing payslips and gather all the information pertaining to deductions. It will be worth checking the Revenue site to find out if there any other exemptions or reliefs available for your circumstances.