Adding new money to PP versus rebalancing?

[ozzy]

Instead of rebalancing, what if I just contribute new money to the underperforming assets to maintain balance?  Thus I would never sell an asset (until retirement), just accumulate more.

Is there any drawback to never selling an asset?

Thanks.

[MediumTex]

Instead of rebalancing, what if I just contribute new money to the underperforming assets to maintain balance?  Thus I would never sell an asset (until retirement), just accumulate more.

Is there any drawback to never selling an asset?

Thanks.

Over time, your new contributions will make up a smaller and smaller perentage of the whole PP value, and thus you will probably eventually encounter rebalancing events no matter what asset you are buying into with new money.

I don't think it matters that much whether you put new money into cash or the lagging asset.  Do whatever feels most comfortable to you.

[steve]

There may be times when you can sell for tax loss or tax gain harvesting.