Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Is it a good idea to rebalance without withdrawing money?
There will quickly come a time when buying to rebalance is impractical. Consider, you save 10%, and at some point, you have 5x your income saved. (you earn $50K and have accumulated $250K). A simple allocation, 50/50, so $125K stock, $125K bonds. Now, in a year the market is up much over 4%, your $5K deposit will not be enough to balance. Earlier on, the method may work just fine, later on, not so much. Edit - The above is an example, to show that there will come a time when deposits are not enough to rebalance. The above single year produces a 52/48 split, and the rebalance deposits more than 2 years. If the market continues to rise a reasonable amount, 2 years later you are even more out of balance, perhaps 56/44.  I chose reasonable numbers as a starting point, just 5X income saved, and a 10% annual deposit. In the end, you can waive off any divergence from your target. That's your choice.