title_body: Is it possible to cap royalties for an ebook? I want to write and publish an ebook, but I am restricted to earning a set amount of income per month from all my income earning efforts.  Is there a way to cap the passive income from an ebook on a monthly basis if that gets too high certain months?  Essentially, I would be given the option by a publisher to monitor my earnings and modulate my income accordingly.  Example:
  
  I can earn $100 a month.
  Ebook A earns $50 in January 
  Ebook B earns $75 in January 
  I can decide to limit the income from Ebook B to $50 that particular month.
upvoted_answer: I feel sure you could LEGALLY, it's just a matter of contract, but I doubt any publisher would want to fool with such a complicated setup. I might be wrong though. Possibly you might find one who'd be willing to do a contract where, if your total royalties from them exceed some fixed cap (it would need to stay fixed - asking to let you change the cap monthly is unreasonable) the excess would go into promotion, might be doable. Alternately, you could simply spend that amount directly promoting your books yourself, and not bother the publisher. Then it would be a deductible business expense I'd assume and so wouldn't be "income". That is probably the simplest thing.