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How to Rebalance Your Portfolio Automatically Without Paying Fees

Picture this: you’ve carefully built an investment portfolio, spreading your money across different assets to manage risk. Six months later, your tech stocks have soared whilst your bonds have barely moved. Suddenly, your carefully planned 60/40 split looks more like 75/25, and your risk profile is completely out of whack.

Welcome to the world of portfolio drift — and the reason why rebalancing matters so much.

Here’s the good news: you don’t need to pay a financial adviser hundreds of pounds to keep your portfolio in shape. In fact, with the right tools and strategies, you can rebalance your portfolio automatically without paying fees at all. And no, you don’t need a finance degree or coding skills to make it happen.

In this guide, I’ll walk you through exactly how to set up automatic portfolio rebalancing, the UK platforms that make it simple, and some clever strategies that keep more money in your pocket where it belongs.

What Is Portfolio Rebalancing (And Why Should You Care)?

Before we dive into the how, let’s make sure we’re all on the same page about the what.

Portfolio rebalancing is simply the process of bringing your investments back to their original target allocation. If you decided you wanted 70% in shares and 30% in bonds, rebalancing means making adjustments when those percentages drift too far from your plan.

Why does this matter? Three main reasons:

• Risk management: When certain assets outperform, your portfolio becomes more heavily weighted towards them. This might mean you’re taking on more risk than you originally intended.
• Disciplined investing: Rebalancing forces you to sell high and buy low — the opposite of what our emotions typically push us to do.
• Staying on track: Your original allocation was presumably based on your goals and risk tolerance. Rebalancing keeps you aligned with those.

The problem? Traditional rebalancing often means selling assets (triggering potential capital gains), paying trading fees, and spending time you’d rather use elsewhere. That’s where automatic, fee-free solutions come in.

Strategy 1: Use Platforms With Built-In Auto-Rebalancing

The easiest way to rebalance your portfolio automatically without paying fees is to choose platforms that do it for you — included in their standard service.

Robo-Advisers: The Set-and-Forget Option

UK robo-advisers have revolutionised passive investing for everyday people. These FCA-regulated platforms use algorithms to manage your portfolio, including automatic rebalancing. Here are some popular options:

• Nutmeg: One of the UK’s largest robo-advisers, Nutmeg automatically rebalances your portfolio when it drifts from your target allocation. Their fees range from 0.25% to 0.75% annually depending on your plan.
• Moneyfarm: Another FCA-regulated option that includes automatic rebalancing. They charge between 0.35% and 0.75% depending on your portfolio size.
• Vanguard Investor: Their LifeStrategy funds are automatically rebalanced internally, and you only pay 0.15% platform fee plus fund costs.
• InvestEngine: Here’s an interesting one — their managed portfolios include automatic rebalancing with a 0.25% fee, but their DIY platform is completely free (yes, really) and includes a rebalancing tool.

Now, you might be thinking: “Wait, these platforms charge fees — I thought this was about rebalancing without paying fees?”

Fair point. The rebalancing itself is free, but you’re paying platform fees anyway. However, these fees are typically much lower than what you’d pay a traditional financial adviser, and the rebalancing is built into that cost. For many UK investors, this represents excellent value.

A Word of Caution

While robo-advisers make investing incredibly simple, they’re not magic money machines. Your investments can still lose value, and past performance doesn’t guarantee future returns. The FCA requires me to remind you: the value of investments can go down as well as up, and you may get back less than you invest.

Strategy 2: Cash Flow Rebalancing (The Clever Free Method)

Here’s a strategy that sophisticated investors use but rarely gets talked about: cash flow rebalancing. It’s completely free, doesn’t trigger capital gains tax, and works brilliantly for people making regular contributions.

How It Works

Instead of selling overweight assets to buy underweight ones, you simply direct your new contributions towards the underweight portions of your portfolio. Over time, this naturally brings everything back into balance.

Let’s say you invest £500 monthly and want a 70/30 split between a global equity fund and a bond fund:

• Month 1: Portfolio drifts to 75/25 because equities performed well
• Instead of selling equities, you put more of your £500 into bonds
• Perhaps £200 to equities and £300 to bonds this month
• Over several months, you drift back towards your target without selling anything

This approach has genuine advantages: no trading costs, no capital gains tax events, and it keeps you regularly engaged with your portfolio.

How to Automate This

Some UK platforms let you set up automatic investments with custom allocation rules. Trading 212, for instance, allows you to create “pies” — customised portfolios where new deposits are automatically distributed according to your target percentages. The platform even shows you how to rebalance using new funds only.

Freetrade’s “Auto-Invest” feature (part of their Plus subscription at £59.88/year) also enables automatic portfolio contributions, making cash flow rebalancing much simpler.

Strategy 3: Threshold-Based Manual Rebalancing (With Free Trading Platforms)

If you prefer more control, you can rebalance your portfolio automatically in terms of triggers whilst executing trades on fee-free platforms.

Setting Up Your System

The key is establishing clear rules so you don’t have to make emotional decisions:

• Set a threshold: Decide you’ll rebalance when any asset class drifts more than 5% from target
• Set a schedule: Check your portfolio quarterly (put it in your calendar)
• Set up alerts: Some platforms and apps can notify you when allocations drift

When rebalancing is triggered, execute your trades on fee-free platforms like:

• Trading 212: Commission-free trading on stocks and ETFs
• Freetrade: Free basic account with commission-free UK and US stocks
• InvestEngine: Free DIY platform for ETF investing

Important caveat: “fee-free” platforms still need to make money somehow. They may make money from foreign exchange fees, premium subscriptions, or interest on uninvested cash. Read the fine print and understand the full cost picture.

Strategy 4: Use Multi-Asset Funds That Self-Rebalance

Perhaps the most hands-off approach to rebalance your portfolio automatically without paying fees (beyond the fund’s own costs) is investing in multi-asset funds that handle everything internally.

UK Options Worth Considering

Vanguard LifeStrategy Funds: These come in different equity/bond splits (20/80, 40/60