I'm all equities. My AA specifies portfolio percentage for each fund/ETF. Any fund that exceeds +/-20% of its target (as in it reaches 6% of the portfolio instead of the 5% target) is bought/sold to return it to the target.
That was supposed to be optimal per William Bernstein, I think, at the time I set up my plan. And once a year was not too bad either. As I remember, it was better to let things ride to reap some benefit from momentum, but not for so long that it they just return to average. And then you want to minimize any transaction costs and tax costs. Not to mention your time. So waiting one year was better than rebalancing quarterly, and 20% triggers were better than 1%.
That was supposed to be optimal per William Bernstein, I think, at the time I set up my plan. And once a year was not too bad either. As I remember, it was better to let things ride to reap some benefit from momentum, but not for so long that it they just return to average. And then you want to minimize any transaction costs and tax costs. Not to mention your time. So waiting one year was better than rebalancing quarterly, and 20% triggers were better than 1%.