Can I rebalance my portfolio without selling anything and triggering taxes?

Yes, and in a taxable account this is often the smartest way. Instead of selling appreciated assets (which triggers capital gains tax), direct your new contributions and any dividends toward whichever asset class is below target. Over time this nudges your allocation back into balance using fresh money, no sale required.

You can also do all your actual selling-and-buying rebalancing inside tax-advantaged accounts like your 401(k) or IRA, where trades create no tax bill at all. Reserve taxable-account sales for when contributions alone can't fix a large drift, and then favor selling lots with the smallest gains or harvesting losses. For most investors early in the journey, cash-flow rebalancing plus adjustments in retirement accounts handles nearly everything. Reserve taxable sales as a last resort so you keep more of your money compounding.