How to rebalance your portfolio: the complete guide

Rebalancing is one of those investing habits that sounds boring but genuinely matters. Done right, it forces you to sell what has run up and buy what has fallen, keeping your risk profile in check over time. Done wrong, or not at all, you end up with a portfolio that looks nothing like the one you intended to hold.

What rebalancing actually is

When you build a portfolio, you choose target allocations. Maybe 60% equities, 20% bonds, 20% alternatives. Or maybe you want 30% in tech, 20% in healthcare, and the rest spread across other sectors.

Over time, markets move. Your winners grow into a larger share of the portfolio. Your laggards shrink. What started as a balanced allocation slowly drifts into something concentrated and riskier than you planned.

Rebalancing means trimming what has grown too large and topping up what has shrunk, to bring your allocations back to your targets.

When should you rebalance?

There are three common approaches:

Time-based rebalancing means doing it on a fixed schedule, quarterly or annually. It is simple and removes the temptation to time the market. The downside is that you might rebalance when drift is minimal and pay unnecessary taxes or fees.

Threshold-based rebalancing means acting when any position drifts more than a set percentage (say, 5%) from its target. This is more efficient but requires monitoring.

Deposit-triggered rebalancing is often the smartest approach if you are regularly investing new money. Instead of selling anything, you direct new deposits into whichever positions are underweight. No tax event, no transaction costs.

Most investors combine approaches. Rebalance quarterly unless something drifts by more than 5% before then, and always use new deposits strategically.

The math of drift

Here is a simple example. You start with 50% in a broad equity index and 50% in bonds. After a strong equity year, stocks have grown to 65% of your portfolio. Your actual risk exposure is now much higher than you intended, even though you did not make a single trade.

If equities then correct by 30%, you lose more than you would have at your original allocation. Rebalancing before the correction would have reduced that loss.

How DeskFi makes this practical

Knowing you should rebalance and knowing exactly what to do are different things. DeskFi shows you your actual allocation next to your target allocation in real time, calculated from your live positions pulled from Trading 212 and Interactive Brokers.

More importantly, it tells you the specific amounts to buy or sell in each position to get back to target. You do not have to work out the math yourself. You see a clear list: buy X of this, trim Y of that.

You can set your target allocations by sector, asset class, or individual ticker, and DeskFi tracks the drift continuously. When rebalancing day comes, you spend five minutes checking the numbers rather than half an hour building a spreadsheet.

If you want to stop guessing and start rebalancing with a real system, try DeskFi free at deskfi.app/signup.