Selling a tech company for seven figures sounds like a finish line. For a surprising number of UK founders, it’s the start of a slow financial unravelling. The money lands, the spending picks up, and within a few years the picture looks nothing like the one they’d imagined at completion.
The reasons repeat themselves, and they’re avoidable. Let’s take a closer look at why this keeps happening and what founders can do to protect what they’ve built.
The Exit Feels Like the Finish Line
There’s a familiar pattern. The deal closes, the wire arrives, and the instinct is to spend. A bigger house, a new car, a few angel cheques into mates’ startups. It feels earned because it is. The problem is treating the exit like a payday rather than a financial event that needs managing.
Anecdotally, plenty of UK fintech and SaaS founders who sold in the post-2018 boom have talked openly about how quickly the money moved. Sales north of £2m didn’t translate into long-term security once tax, lifestyle inflation and speculative reinvestment took their share. The common thread wasn’t reckless spending on its own. It was the absence of any plan for what came after.
Capital Gains Tax Catches Founders Off Guard
The biggest shock is usually the tax bill. Business Asset Disposal Relief (formerly Entrepreneurs’ Relief) reduces the CGT rate on the first £1m of qualifying lifetime gains, but the rate itself has been climbing. It sat at 10% until April 2025, rose to 14% for 2025/26, and rises again to 18% from 6 April 2026. The annual exempt amount for CGT is just £3,000 for 2025/26, which barely registers on a seven-figure disposal. Gains above the £1m threshold are taxed at the main CGT rates, which jumped from 20% to 24% on 30 October 2024.
A founder selling for £3m or £4m today faces a materially higher bill than one who exited two years ago. Those who see the headline number and start spending against it often end up staring at a six-figure liability they hadn’t budgeted for. It’s one of the fastest ways post-exit wealth disappears.
Paper Wealth vs. What’s Actually in the Bank
Earn-outs and deferred consideration are standard in UK tech acquisitions. A £5m deal might see £2m land on day one, with the rest tied to performance targets over two or three years. If the acquirer misses those targets, or the working relationship sours, the back-end payments can shrink or vanish. Spending habits adjust to the headline figure, not the cash in the account, and that’s where founders get caught.
What Founders Should Do in the 12 Months Before an Exit
Smart founders start planning well before completion. In the year leading up to a sale, a few moves make a real difference:
This is where good financial planning services earn their keep. Mapping tax liabilities, structuring pension contributions and building an investment plan around the actual (not headline) cash all sit outside what most founders have time to think about while running a sale process.
The First Year After the Sale Is Where Most Damage Happens
The 12 months after an exit are the most dangerous. Founders often describe an identity vacuum. The business that consumed their life is gone, and spending fills the gap. Lifestyle inflation sets in quickly, and without a budget or investment strategy, the balance drains.
Then there’s the temptation to back new ventures immediately. Angel investing is exciting, but writing £50k or £100k cheques into early-stage companies is high risk. Founders who pour exit proceeds into other startups without diversifying first can lose a serious chunk of their wealth before they’ve had time to think.
A Plan Beats a Payday Every Time
Selling a business is one of the biggest financial events most people go through. The founders who come out the other side in good shape are the ones who treat it like the high-stakes moment it is. That means getting tax advice early, being realistic about what actually lands, and resisting the urge to spend against a number that hasn’t fully arrived. The exit isn’t the end of the journey. It’s the start of a different one.
The value of your investments and the income from them may go down as well as up, and you could get back less than you invested. Past performance should not be seen as an indication of future performance.
