This is something I talked to authors about a lot when they would suggest or submit a co-written book. That can be great for your inspiration and productivity and fresh voice, but it also entails a LOT of potential problems.
Do your writing techniques mesh? Can you handle blunt critiquing from your partner and others? What if you have major disagreements about the story or anything else? Who’s doing which tasks, not just in writing but all the related stuff–social media, marketing, contacting reviewers, and on and on? And who’s paying for that, or for an editor or cover artist? For that matter, how are you splitting the income? If one of you does more work than the other or takes on expenses, does that person get paid first out of income or get a bigger percentage?
And what about some catastrophic illness (or even death) that may prevent your co-author from completing her or his part of the project? What about the future–who inherits the rights eventually?
So before you and your best friend jump into that joint book, read this article and discuss all the points with each other. Or I guarantee you most likely will not be best friends by the time the book is done–if it ever is.
Co-Authors: Before You Tie the Knot
“The best way to improve the odds of a successful writing partnership is to take the time to put the collaboration agreement in writing up front.”