\documentclass[a4paper,12pt, landscape]{article}

\usepackage[utf8]{inputenc}

\usepackage[a4paper,landscape]{geometry}
\geometry{
    left=1cm,
    right=5cm,
    top=1cm,
    bottom=0cm
}

%\usepackage{geometry}
%
%\geometry{
%  body={22cm, 17cm},
%  left=2cm,
%  top=2cm
%}

\newenvironment{large_label}%
{
\begin{tabular}{|c|}
\hline
\\
\begin{minipage}[t][140mm]{48mm}
\centering%
}%
{
\end{minipage} \\
\hline
\end{tabular}
}

\newenvironment{small_label}%
{
\begin{tabular}{|c|}
\hline
\\
\begin{minipage}[t][140mm]{30mm}
\centering%
}%
{
\end{minipage} \\
\hline
\end{tabular}
}

\newcommand{\separator}{\\ ----------------- \\}
\newcommand{\titlesep}{\\ \hfill \hline \hfill \\}

\begin{document}
%\begin{large_label}
%\textbf{\emph{Schwery Thomas} Administration}
%\titlesep
%\textbf{2014 - \ldots} \\
%PostFinance \\
%BCVs \\
%Credit Suisse \\
%Salaires \\
%Voiture \\
%Assurance Maladie \\
%Appartement Martigny \\
%Administration VS \\
%Factures
%\end{large_label}
%\begin{large_label}
%\centering
%\textbf{\emph{Schwery Thomas} Administration}
%\titlesep
%\textbf{2007 - 2013} \\
%PostFinance \\
%BCVs \\
%Credit Suisse \\
%Salaires \\
%Voiture \\
%Assurance Maladie \\
%Appartement Martigny \\
%Administration VS \\
%Administration VD \\
%Factures
%\end{large_label}
\begin{large_label}
\centering
%\textbf{\emph{Schwery Thomas} EPFL} \\
Administration
\titlesep
\textbf{2014 - \ldots} \\
Postfinance \\
Appartement \\
\end{large_label}
\begin{large_label}
\centering
%\textbf{\emph{Schwery Thomas} EPFL} \\
Appartement Martigny
\titlesep
%\textbf{Divers} \\
Notices meubles \\
\end{large_label}
\end{document}