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How to Rebalance Your Portfolio Automatically Without Paying Fees

Picture this: you’ve done the hard work of setting up your investment portfolio. You’ve carefully chosen your mix of stocks, bonds, and perhaps a few index funds. You’re feeling pretty good about your financial future. Then, six months later, you check in and discover your carefully planned 60/40 stock-bond split has drifted to 75/25 because tech stocks went on a tear.

Now what? You know you should rebalance – every investment guide tells you so – but the thought of selling and buying, paying trading fees, and potentially triggering tax events makes you want to close the app and pretend you never looked.

Here’s the good news: in 2025, you can rebalance your portfolio automatically without paying fees, and you don’t need to be a City trader or tech wizard to set it up. This guide will walk you through exactly how to do it, with a focus on tools and strategies that work brilliantly for UK investors.

Why Portfolio Rebalancing Actually Matters

Before we dive into the how, let’s quickly cover the why – because understanding this will help you stick with your strategy when markets get choppy.

Rebalancing is simply the process of bringing your investments back to your original target allocation. If you decided that 60% stocks and 40% bonds suited your risk tolerance, rebalancing means periodically adjusting your holdings to maintain that ratio.

Why does this matter? Three key reasons:

• Risk management: When stocks surge, your portfolio becomes riskier than you intended. Rebalancing keeps your risk level consistent with what you can actually stomach during a downturn.
• Disciplined investing: Rebalancing forces you to sell high and buy low – the opposite of what our emotions typically push us to do.
• Maintaining your strategy: Your original allocation wasn’t random. It reflected your goals, timeline, and risk tolerance. Drift undermines all that careful planning.

Research from Vanguard suggests that rebalancing can reduce portfolio volatility by up to 20% compared to never rebalancing – without necessarily sacrificing returns. That’s the kind of free lunch we should all be taking advantage of.

The Old Way: Why Manual Rebalancing Is a Pain

Traditionally, rebalancing meant logging into your account, calculating what percentage each holding now represents, working out what to sell and buy, executing multiple trades, and hoping you don’t make an expensive mistake along the way.

Worse still, many platforms used to charge £10-15 per trade. If you held ten different funds and needed to adjust several of them, you could easily spend £50-100 just keeping your portfolio in shape. Do that quarterly, and you’re looking at £200-400 per year eaten up by fees alone.

No wonder so many people simply… didn’t bother.

How to Rebalance Your Portfolio Automatically Without Paying Fees

The investing landscape has changed dramatically in recent years, particularly for UK investors. Here are the most effective ways to rebalance your portfolio automatically without paying fees – ranked from simplest to most hands-on.

Option 1: Use a Robo-Advisor That Handles Everything

If you want true set-and-forget automation, robo-advisors are your best friend. These platforms use algorithms to manage your investments, including automatic rebalancing, without you lifting a finger.

UK-friendly options include:

• Nutmeg: One of the UK’s original robo-advisors, now owned by JP Morgan. They rebalance your portfolio automatically whenever it drifts beyond set thresholds. Fees range from 0.25% to 0.75% depending on your chosen service level.
• Wealthify: Offers automatic rebalancing with a simple fee structure starting at 0.6%. They also offer ethical portfolio options.
• Moneyfarm: Provides automatic rebalancing and has been rated highly for customer service. Fees start at 0.75% but decrease as your portfolio grows.
• InvestEngine: This is a particularly interesting option because their managed portfolios include automatic rebalancing with fees as low as 0.25% – and their DIY platform charges zero management fees at all.

Now, you might be thinking: “Wait, these platforms charge management fees – that’s not free!” You’re right to question this. However, there’s an important distinction: these are ongoing management fees, not transaction fees for rebalancing. The rebalancing itself doesn’t cost extra, and the overall fee is often lower than what you’d pay in trading commissions doing it yourself the old way.

Important caveat: All investments carry risk, and past performance doesn’t guarantee future results. Robo-advisors can make investing more accessible, but they can’t protect you from market downturns. Make sure you understand what you’re investing in and that it matches your risk tolerance.

Option 2: Choose Platforms with Free Trading and Built-In Rebalancing Tools

If you prefer more control but still want to rebalance your portfolio automatically without paying fees, several UK investment platforms now offer commission-free trading combined with rebalancing tools.

Trading 212: Offers completely commission-free trading on stocks and ETFs, plus a “Pies” feature that’s genuinely brilliant for passive investors. You create a “pie” with your target allocation (for example, 40% global stocks, 30% UK stocks, 20% bonds, 10% emerging markets), and the platform can automatically rebalance whenever you add money or on a schedule you set. The rebalancing is free because the trading is free.

InvestEngine (DIY): Their DIY portfolio option lets you build a portfolio of ETFs with zero trading fees and zero platform fees. They offer automatic rebalancing on a schedule you choose – weekly, monthly, quarterly, or annually. This is genuinely free, funded by their managed service and business accounts.

Freetrade: Offers commission-free trading on a wide range of stocks and ETFs. While they don’t have automatic rebalancing built in, the lack of trading fees means you can rebalance manually without cost. Their Plus subscription (£9.99/month) unlocks additional features including a larger ISA allowance.

These platforms are authorised and regulated by the Financial Conduct Authority (FCA), which means your money benefits from UK regulatory protections. Always verify this yourself before investing – you can check the FCA register at register.fca.org.uk.

Option 3: Use Smart Rebalancing Through Cash Flow

Here’s a clever technique that many experienced investors use: instead of selling winners to rebalance, you simply direct new contributions toward underweight positions.

Let’s say your target is 60% stocks, 40% bonds, but your portfolio has drifted to 70% stocks, 30% bonds. Rather than selling stocks (potentially triggering capital gains tax outside an ISA), you direct your next few months of contributions entirely into bonds until the balance is restored.

This approach:

• Avoids transaction fees entirely (even on platforms that charge them)
• Avoids selling, which means no capital gains tax events
• Still achieves the goal of maintaining your target allocation

Several platforms make this easy. Trading 212’s Pies, for instance, can automatically direct new money to underweight holdings. InvestEngine does the same with their auto-invest feature.

The limitation? This only works if you’re regularly adding money. If your portfolio is static, you’ll eventually need to sell and buy to rebalance.

Option 4: Set Up Threshold-Based Rebalancing Alerts

If you’re comfortable with a bit more involvement but want