Retirement tax questions

No.  You can  use your IRA RMD and withdrawals for anything  you want.  It will still be taxable.  Doesn't matter how  you pay the taxes on all your income.  You can have withholding from your pension and social security or send in quarterly estimated payments.  Or even have it all withheld from your IRA withdrawal.  

 

But if you take out more from your IRA  to cover the taxes, the withdrawal will still be taxable.