Chancellor John Healey confirmed in a letter to the Treasury Select Committee, published on July 31, 2026, that the UK's Autumn Budget will land on Wednesday, October 28, 2026. In the months since, 120 British millionaires — including former footballer Gary Lineker — signed an open letter urging the government to introduce an annual 2% tax on wealth above £10 million, a measure campaigners say could raise roughly £24 billion a year. At the same time, Henley & Partners projects that 16,500 millionaires will leave the UK in 2025 alone, and the Adam Smith Institute says the number of UK adults worth £1 million or more has fallen by 7% since 2024 and more than halved since 2020.
No tax measure has actually been announced yet, and most forecasters expect Healey to lean on frozen thresholds and targeted levies on property, dividends, and savings rather than a headline wealth tax. But the uncertainty itself is the problem: when a government is actively weighing how to tax wealth, waiting until the Budget speech to react is the wrong move. Here's what the run-up to October 28 actually means for your money, and the concrete steps to take in the next few weeks — whether you bank in London, New York, Toronto, Sydney, or Auckland.
Key Numbers to Know
| Fact | Figure | Why It Matters |
|---|---|---|
| Autumn Budget 2026 date | Wednesday, October 28, 2026 | Confirmed by Chancellor Healey on July 31; any tax changes typically take effect that night or from the next tax year |
| Proposed UK wealth tax | 2% annually on net wealth over £10 million | Backed by a 120-signature millionaire letter; projected to raise ~£24bn/year if adopted |
| Millionaires projected to leave UK in 2025 | 16,500 (Henley & Partners) | Largest single-year wealth outflow tracked for any country |
| UK £1m+ households since 2020 | Down more than 50% (Adam Smith Institute) | Shows how quickly mobile wealth can relocate when tax policy shifts |
| US federal estate/gift exemption, 2026 | $15 million per person / $30 million per married couple | Made permanent by the One Big Beautiful Bill Act, with no sunset — a useful contrast to the UK's direction of travel |
Why This Matters Even If You Don't Live in the UK
It's tempting to read Budget speculation as a British story and move on. That would be a mistake, for two reasons. First, fiscal drag — the practice of freezing tax thresholds while wages and asset values rise — is not a UK-only phenomenon. The UK has frozen its personal allowance and higher-rate threshold since 2021, quietly pulling millions of people into higher tax bands without ever raising a headline rate. The US, Canada, and Australia have all used similar freezes or slow-walked indexation at various points, and any saver who assumes "my bracket won't change" is making a bet that governments facing budget pressure rarely honor.
Second, the UK experiment is a live test case the rest of the world is watching. Spain, Norway, and Switzerland already run some form of wealth tax; France and Germany abandoned theirs after concluding the administrative cost and capital flight outweighed the revenue. If the UK adopts a version and it works, expect the idea to resurface in Ottawa, Canberra, and Wellington within a few budget cycles. If it fails — and pushes thousands more households out — that failure becomes the cautionary tale finance ministries cite for the next decade. Either way, the policy mechanics working through London right now are worth understanding before they show up closer to home.
Your Pre-Budget Wealth Checklist
You don't need to guess what Healey will announce to act sensibly. Most of what protects you from a wealth tax also protects you from ordinary fiscal drag, currency swings, and bad luck. Work through this list before October 28 if you hold meaningful assets in the UK, and treat it as a year-end checklist regardless of where you live:
- Use this year's ISA allowance before it resets. The UK ISA allowance is £20,000 for the 2026/27 tax year, and unused room doesn't carry over. If a reform narrows the allowance or caps cash ISAs, you want this year's shelter already filled.
- Check your pension annual allowance and carry-forward. Pension tax relief is a perennial target for Budget speculation; using this year's allowance locks in relief at today's rules rather than tomorrow's.
- Review where large assets are legally held. A wealth tax proposal targets net wealth, not income, so the composition of your balance sheet — property, business equity, investment portfolios, cash — matters more than usual. Get an up-to-date valuation rather than relying on old estimates.
- Don't make an irreversible move on rumor alone. Henley & Partners' 16,500 figure reflects people who already decided to leave; don't let anxiety about an unannounced policy push you into relocating or restructuring before you know what, if anything, actually changes.
- Revisit your will and any cross-border estate exposure. If you have assets or heirs in more than one country, a single Budget announcement can change the tax treatment of an inheritance that crosses borders — worth a conversation with an advisor who handles both jurisdictions.
- Build a cash buffer separate from your invested wealth. If new rules do arrive with little notice, having liquidity outside your main portfolio means you're not forced to sell growth assets at a bad time to cover a new liability.
How to Max Out Your Tax-Advantaged Allowances, Wherever You Live
The single most reliable defense against any country's shifting wealth-tax politics is simple: keep as much of your net worth as possible inside accounts that are already tax-advantaged by law, since those wrappers are harder to retarget mid-year than open market wealth. Here's where the major Tier 1 economies stand for 2026.
| Country | Primary Wrapper | 2026 Limit | Note |
|---|---|---|---|
| United Kingdom | ISA | £20,000/year | Growth and withdrawals are entirely tax-free; no lifetime cap |
| United States | 401(k) | $24,500/year ($8,000 catch-up for ages 50-59 or 64+) | IRA limit is $7,500 for 2026; income phase-outs apply to Roth IRAs |
| Canada | TFSA | $7,000 CAD/year | Unused room carries forward indefinitely, unlike the UK ISA |
| Australia | Superannuation (concessional) | $30,000 AUD/year | Contributions taxed at 15% going in, generally tax-free after preservation age |
| New Zealand | KiwiSaver | Employee contribution 3-10% of pay | Government and employer contributions add to the pot at no extra cost to you |
None of these wrappers are immune to future reform — the UK has trimmed pension tax relief before, and the US has debated capping 401(k) contributions for high earners. But a government revisiting the rules on a tax-advantaged account still has to legislate a specific change, while a broad wealth tax can in theory sweep in anything you hold outside one. Filling your allowance each year is the lowest-regret move available, Budget or no Budget.
Common Mistakes to Avoid
Pre-Budget anxiety tends to push people toward decisions that cost more than the rumored tax ever would. Watch for these specifically:
- Panic-selling appreciated assets to "get ahead of" a tax that hasn't been announced, which can trigger capital gains tax immediately in exchange for avoiding a levy that may never materialize.
- Restructuring ownership purely for tax reasons without considering what it does to control, inheritance planning, or your ability to access the asset later.
- Treating every rumor as policy. The 120-millionaire letter is a lobbying position, not legislation; Grant Thornton and other major advisory firms have explicitly noted that no rates or thresholds have been confirmed for this Budget.
- Ignoring smaller, quieter changes like threshold freezes in favor of fixating on the headline wealth-tax debate — fiscal drag has cost UK taxpayers far more cumulative revenue than any single proposed levy.
- Assuming this is only a UK story and skipping your own country's upcoming budget cycle, when the same fiscal pressures (debt servicing costs, aging populations, slower growth) are pushing most Tier 1 governments toward similar choices.
Should You Actually Consider Moving Your Wealth or Yourself?
For the overwhelming majority of readers, no — and certainly not before October 28. Relocating residency or restructuring significant assets across borders is expensive, often irreversible, and typically only makes sense well above the thresholds being discussed (the proposed UK levy targets wealth over £10 million, not the net worth of a typical reader). If you are genuinely in that bracket, the right move is a conversation with a cross-border tax advisor now, before the Budget, not a unilateral decision based on a newspaper headline. For everyone else, the more useful takeaway from the UK's millionaire exodus is behavioral: it shows how quickly capital moves when policy uncertainty drags on, which is exactly why filling this year's allowances and keeping your plan flexible matters more than predicting Healey's exact announcement.
What to Do Next
Put a date on your calendar for October 28, 2026, and plan to review your finances again within a week of the announcement, not months later. Between now and then, work through the checklist above, confirm your 2026/27 ISA, 401(k), TFSA, or super contributions are on track, and get a current valuation of any large or illiquid assets so you're not scrambling to figure out what you own if rules change quickly. If you work with a financial advisor or accountant, book the appointment now rather than in the post-Budget rush, when every advisor in the country is booked solid.