\documentclass{scrartcl}
\usepackage[latin1]{inputenc}
\usepackage{tabularx}
\usepackage[letterpaper,top=2cm,bottom=1cm,left=1.1cm,right=1.5cm]{geometry}
\usepackage{graphicx}

\begin{document}

\pagestyle{myheadings}
\thispagestyle{empty}

\fontfamily{cmss}\fontsize{10pt}{12pt}\selectfont

\newsavebox{\ftr}
\sbox{\ftr}{
  \parbox{\textwidth}{
  \tiny
  \rule[1.5em]{\textwidth}{0.5pt}
Payment due NET <%terms%> Days from date of Invoice. Interest on overdue amounts will acrue at the rate of 12\% per annum starting from <%duedate%> until paid in full. Items returned are subject to a 10\% restocking charge.
A return authorization must be obtained from <%company%> before goods are returned. Returns must be shipped prepaid and properly insured.
<%company%> will not be responsible for damages during transit.
  }
}

<%include letterhead.tex%>

<%pagebreak 90 27 37%>
\end{tabularx}

  \rule{\textwidth}{2pt}
  
  \vspace{0.2cm}

  \hfill
  \begin{tabularx}{\textwidth}{Xr@{\hspace{1cm}}r@{}}
  & Subtotal & <%sumcarriedforward%> \\
  \end{tabularx}

\newpage

\markboth{<%company%>\hfill <%invnumber%>}{<%company%>\hfill <%invnumber%>}

\begin{tabularx}{\textwidth}{@{}rlXlrlrrr@{}}
  \textbf{Pos} & \textbf{Number} & \textbf{Description} & & \textbf{Qt'y} &
    \textbf{Unit} & \textbf{Price} & \textbf{Disc \%} & \textbf{Amount} \\ [0.5em]
  & carried forward from page <%lastpage%> & & & & & & & <%sumcarriedforward%> \\ [0.5em]
<%end pagebreak%>


\vspace*{0.5cm}

\parbox[t]{.5\textwidth}{
\textbf{To}
\vspace{0.3cm}

<%name%>

<%address1%>

<%address2%>

<%city%>
<%if state%>
\hspace{-0.1cm}, <%state%>
<%end state%>
<%zipcode%>

<%country%>

\vspace{0.3cm}

<%if contact%>
<%contact%>
\vspace{0.2cm}
<%end contact%>

<%if customerphone%>
Tel: <%customerphone%>
<%end customerphone%>

<%if customerfax%>
Fax: <%customerfax%>
<%end customerfax%>

<%email%>
}
\parbox[t]{.5\textwidth}{
\textbf{Ship To}
\vspace{0.3cm}

<%shiptoname%>

<%shiptoaddress1%>

<%shiptoaddress2%>

<%shiptocity%>
<%if shiptostate%>
\hspace{-0.1cm}, <%shiptostate%>
<%end shiptostate%>
<%shiptozipcode%>

<%shiptocountry%>

\vspace{0.3cm}

<%if shiptocontact%>
<%shiptocontact%>
\vspace{0.2cm}
<%end shiptocontact%>

<%if shiptophone%>
Tel: <%shiptophone%>
<%end shiptophone%>

<%if shiptofax%>
Fax: <%shiptofax%>
<%end shiptofax%>

<%shiptoemail%>
}
\hfill

\vspace{1cm}

\textbf{I N V O I C E}
\hfill

\vspace{1cm}

\begin{tabularx}{\textwidth}{*{7}{|X}|} \hline
  \textbf{Invoice \#} & \textbf{Date} & \textbf{Due} & \textbf{Order \#}
  & \textbf{Salesperson} & \textbf{Shipping Point} & \textbf{Ship via} \\ [0.5em]
  \hline
  <%invnumber%> & <%invdate%> & <%duedate%> & <%ordnumber%> & <%employee%>
  & <%shippingpoint%> & <%shipvia%> \\
  \hline
\end{tabularx}

\vspace{1cm}

\begin{tabularx}{\textwidth}{@{}rlXlrlrrr@{}}
  \textbf{Pos} & \textbf{Number} & \textbf{Description} & & \textbf{Qt'y} &
    \textbf{Unit} & \textbf{Price} & \textbf{Disc \%} & \textbf{Amount} \\ [0.5em]
<%foreach number%>
  <%runningnumber%> & <%number%> & <%description%> & <%deliverydate%> &
  <%qty%> & <%unit%> & <%sellprice%> & <%discountrate%> & <%linetotal%> \\
<%end number%>
\end{tabularx}


\parbox{\textwidth}{
\rule{\textwidth}{2pt}

\vspace{0.2cm}

\hfill
\begin{tabularx}{7cm}{Xr@{\hspace{1cm}}r@{}}
  & Subtotal & <%subtotal%> \\
<%foreach tax%>
  & <%taxdescription%> on <%taxbase%> & <%tax%> \\
<%end tax%>
<%if paid%>
  & Paid & - <%paid%> \\
<%end paid%>
  \hline
<%if total%>
  & Balance Due & <%total%>
<%end total%>
\end{tabularx}

\vspace{0.3cm}

<%text_amount%> ***** <%decimal%>/100
\hfill
All prices in \textbf{<%currency%>}.

\vspace{12pt}

<%notes%>
}

\vfill

<%if paid_1%>
\begin{tabularx}{10cm}{@{}lXlr@{}}
  \textbf{Payments} & & & \\
  \hline
  \textbf{Date} & & \textbf{Source} & \textbf{Amount} \\
<%end paid_1%>
<%foreach payment%>
  <%paymentdate%> & <%paymentaccount%> & <%paymentsource%> & <%payment%> \\
<%end payment%>
<%if paid_1%>
\end{tabularx}
<%end paid_1%>

\vspace{1cm}

\centerline{\textbf{Payments within Denmark:}}
\centerline{\textbf{Please transfer directly to Merkur Andelskasse, bank account 8401-1028192}}
\centerline{\textbf{International payments:}}
\centerline{\textbf{Please transfer directly to Ringkjobing Bank, Torvet 2, 6959 Ringkobing}}
\centerline{\textbf{SWIFT code: RIBADK22, account: 076600784011}}
\centerline{\textbf{Add "To Spiff ApS (8401-1028192) from \textbf{<%name%>}" as text.}}

\rule{\textwidth}{0.5pt}

\usebox{\ftr}

\end{document}