Tracking a portfolio properly comes down to four habits: get every account into one view, measure your return against the money you actually put in (not the number that flatters you), watch concentration and drawdown instead of daily prices, and keep the records UK tax rules quietly assume you already have. Most of us do the first one badly and the last one not at all. This guide presents the full system — with a deeper guide linked at every step.
Somewhere around the second or third account, most UK investors get lost in the plot. There’s an ISA here, a pension there, a Trading 212 experiment from 2023, a few US shares on another app — and no single place that answers the only question that matters: how am I actually doing? Checking five apps in rotation feels like tracking. It isn’t. Here’s what is.
Key Takeaways
- Consolidation beats sophistication: a complete, slightly crude view of everything beats a beautiful view of one account.
- Your broker’s return figure isn’t your return — once deposits and multiple accounts are involved, only a money-weighted calculation tells the truth.
- Risk hides in the gaps between accounts: concentration and overlap only show up when holdings are viewed together.
- Records are not optional in the UK: capital gains rules need your full purchase history, and no broker reports your trades to HMRC for you.
What does “tracking your portfolio” actually mean?
It means being able to answer five questions without opening five apps: what do I own in total, what has it earned against what I put in, where am I overexposed, what income is it producing — and could I prove any of this to HMRC if asked? That’s the whole job. Notice what’s not on the list: knowing today’s prices. Prices change by the minute; none of those five answers do.
Be honest about the opposite habit, because it’s the most common one: opening the app whenever markets make the news, feeling something, and closing it. That’s not tracking — that’s mood-checking, and it usually leads to selling into a dip you’d have ridden out if you hadn’t looked.
Step 1 — Get everything into one place
Every broker can already export your history as a file, and that file is the foundation of everything else. Start there: one export per account, pulled on a schedule. The exact clicks differ wildly by platform — Trading 212 caps each file at one calendar year, eToro exports Excel rather than CSV, Hargreaves Lansdown quotes prices in pence and can inflate a careless spreadsheet a hundredfold. We’ve documented the path for every major platform: our one-page UK broker export cheat-sheet covers eight of them (there’s a US edition too), and the per-broker guides go deeper — Trading 212, eToro and Hargreaves Lansdown each have their own quirks worth knowing.
One rule while you consolidate: never blend your wrappers. An ISA and a general account might hold identical funds, but they live in different tax universes — mixing their histories corrupts both. Keep the account column in every file you save.
Step 2 — Pick your method (there are only three)
| Method | Best at | Falls down on |
|---|---|---|
| Broker apps as-is | Zero effort; fine for a single account | No cross-account view; each app flatters its own slice |
| Spreadsheet | Full control; free; teaches you your own portfolio | Manual upkeep; silently breaks on pence pricing, FX and stock splits |
| Dedicated tracker | Consolidation and the maths done for you | Choosing one means deciding what data you’re willing to share |
There’s no perfect answer here. The useful question is: what does the tool ask of you? Some trackers want your broker passwords — a bad idea, and often against your broker’s terms. Some use read-only connections; better, though coverage of UK investment platforms is patchy. The most private route is the least glamorous: upload the statement files you already exported, and let nothing else touch your accounts. We’ve compared all three honestly — including what can go wrong with each — in our guide to tracking a portfolio without linking your accounts.
Step 3 — Measure what actually matters
Four numbers, checked monthly, beat forty numbers checked daily.
Your real return. If you’ve been adding money along the way — and most people have — the “total return” your app shows is not what your pounds have earned. £10,000 growing to £13,000 looks like 30%; if £2,000 of that was fresh deposits, the truth is closer to 10%. The honest measure is money-weighted return (XIRR), computed across all accounts together. And when you’re setting targets rather than measuring history, our free CAGR calculator shows what annual return a goal actually demands — with a realism check attached.
Concentration. The risk that actually hurts private investors is rarely “the market” — it’s the position that crept up to a third of everything, or the same US tech names held through three different funds. A simple threshold works: any single position above 10% of your total wealth deserves a deliberate decision, not a shrug.
To see what a serious equity fall would do to your specific mix — and the gain needed to climb back — try our free portfolio drawdown simulator.
Drawdown. Know your portfolio’s worst historical fall, in pounds, and ask whether you’d genuinely sit through it again. It’s a better honesty test than any risk questionnaire.
Costs. Fees compound just as returns do, only against you. A “small” percentage platform fee on a growing portfolio typically costs a five-figure sum over twenty years — our platform fee calculator puts your own numbers on that, including where the breakeven against flat-fee platforms sits.
Step 4 — Keep the records HMRC expects
This is the step that’s easiest to skip, and it’s the one with a deadline attached. Capital gains tax doesn’t just need this year’s trades — it needs your entire purchase history, matched under HMRC’s same-day, 30-day and Section 104 rules, across every broker you use. Nobody assembles that for you: your broker doesn’t report your trades to HMRC, and platform history has a way of truncating or disappearing after transfers. Your saved exports are the evidence trail behind every figure you’ll ever file.
The working system is simple: one export per account per tax year, kept permanently, logged as you go — our free CGT record-keeping template gives that ledger a structure. For what the rules actually mean in practice, the tax guides go platform by platform, starting with Trading 212 and eToro.
How often should you actually look?
Monthly, for twenty minutes, with a checklist — and annually in depth. The monthly pass: refresh your exports, glance at the four numbers above, note anything that crossed a threshold. The annual pass, best done just after the tax year ends on 5 April: full performance review, allowance planning, and a records check while everything is fresh. Daily checking adds nothing but cortisol. The evidence on this is unusually consistent: the more often investors look, the worse they tend to do, because every glance is another chance to act on noise.
To make the cadence stick, our free monthly portfolio review checklist compresses this into a printable 20-minute ritual.
Avex AI provides software and educational content — mathematical context, never investment advice. Thresholds mentioned here are common analytical conventions, not recommendations. Capital at risk.
Statement exports, consolidated in one place. Every UK broker can export your history as a file; pulled on a schedule, those files give you a complete cross-account view without sharing a single login. The alternatives fall short: checking each app separately misses the full picture, and handing over passwords is a privacy trade most people regret.
For one account and patience, yes. Across several UK brokers it gets fragile: pence-quoted prices, USD conversions, stock splits and wrapper mixing all corrupt totals silently. If you go the spreadsheet route, build in checks for those four — or use a tool that handles them.
Monthly for twenty minutes, annually in depth — and ideally not at all in between. Frequent checking is consistently associated with worse investor behaviour: the more you look, the more tempted you are to act on noise.
For tax, no — ISA gains and income are tax-free and don’t go on a return. For everything else, yes: performance, concentration and costs behave identically inside a wrapper, and an untracked ISA is where overlap tends to pile up.
Your complete purchase and sale history — dates, quantities, prices and fees — across all brokers, kept permanently. HMRC’s matching rules reach back through your entire holding history, and your broker doesn’t report or compute any of it for you. One export per account per tax year is the habit that makes filing painless.
