Terminates the processing of a subroutine started by GOSUB.

Subroutines may never be achieved by the normal program sequence, or be started by GOTO. Executed in the main program, RETURN leads to a runtime error. Are subroutines at the end of a program, then the main program should be terminated before with END. If subroutines stand before the main program, then a branch instruction is needed to go around:

GOTO MAIN : ! Goto main program ! a subroutine follows $SUB PRINT "Subroutine" RETURN ! the main program $MAIN ...

RETURN is also used with user functions.