An Invoice (invoice.sty)
\documentclass{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}% defines \texteuro
\usepackage{invoice}% load last
\begin{document}
\begin{invoice}{\pounds}{20}
\ProjectTitle{Sample Project}
\Fee{Proof-reading}{150.0}{2}
\EBC{Train fare}{43.95}
\EFC{Hotel}{\texteuro}{300}{0.82}{}
\end{invoice}
\end{document}
Download sample-invoice.tex or sample-invoice.pdf.