# How can I set the vertical margin of my chapter headings?

I currently don't like the typesetting of a document. In my two sided document, I want that the chapter headings not have a vertical space before their appearance.

The text on the second page should start at line 1 or if it's possible on line 2.

My document preamble:

\documentclass[12pt,parskip=half,a4paper,twoside]{scrreprt}
[..]
\usepackage{fancyhdr}
\usepackage{titlesec}
[..]
\titleformat{\chapter}[hang]{\normalfont\huge\bfseries}{\thechapter}{1em}{\Huge}
\titlespacing*{\chapter}{0pt}{0pt}{1em}

\titleformat{\section}{\normalfont\Large\bfseries}{\thesection}{1em}{}
\titlespacing*{\section}{0em}{1em}{0em}

\titleformat{\subsection}{\normalfont\large\bfseries}{\thesubsection}{1em}{}
\titleformat{\subsubsection}{\normalfont\normalsize\bfseries}{\thesubsubsection}{1em}{}
\titleformat{\paragraph}[runin]{\normalfont\normalsize\bfseries}{\theparagraph}{1em}{}
\titleformat{\subparagraph}[runin]{\normalfont\normalsize\bfseries}{\thesubparagraph}{1em}{}

\begin{document}
[..]
\end{document}


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I see no vertical space before the chapter title. –  egreg Dec 2 '11 at 21:47
On the second page appear the text before the chapter heading on the first page. How can I make that everything on the same vertical position starts? –  Sam Dec 2 '11 at 21:53
Oh, yeah! That's not the heading, but a subsection title. –  egreg Dec 2 '11 at 21:56

You can try with

\renewcommand{\chapterheadstartvskip}{\vspace*{-2\baselineskip}}


\titlespacing*{\chapter}{0pt}{-2\baselineskip}{1em}

Thank you for your answer. Unfortunately, it does not work. I use the package titlesec. Is this might the problem? –  Sam Dec 2 '11 at 22:39
Your solution works when I don't use titlesec. I've updated my question. I think that's all, what is in context with my problem. –  Sam Dec 2 '11 at 22:51