jmc

Every real number can be expressed in the form $1-x$ for some real $x$, and every real number except $0$ can be expressed as the reciprocal of some real number. Therefore, the range of $f(x)=\frac{1}{1-x}$ consists of all real numbers except $0$. In interval notation, this is $\boxed{(-\infty ,0)\cup (0,\infty )}$.