Various facts applying I have heard as little as 8% and as much as 30% for a typical Angel round. Venture backed Seed funding usually being within that range.<p>It's good to be flexible but to have enough of a belief in what you are doing that if the first offer isn't the right offer you are willing to walk away in search of the right deal. Having a ceiling is generally good.<p>You want to make sure you can last 2-3 rounds before giving up a majority stake.
See <a href="http://indexventures.com/news-room/blog/a-letter-to-german-entrepreneurs" rel="nofollow">http://indexventures.com/news-room/blog/a-letter-to-german-e...</a> - it's about the German market but the numbers are in the right ballpark for most major markets.