Selling angel shares before the company exits is a taxable event, not the tax-free one some assume. If you sell a private stake on the secondary market, the profit is a capital gain, and for 2026/27 the rate is 18% within your basic-rate band and 24% above it, after a £3,000 annual exempt amount. The complication that catches angels out is the scheme layer: EIS and SEIS shares can be exempt, but only once you have held them long enough.
The Carry's reading: the tax on a secondary turns almost entirely on whether the shares still carry EIS or SEIS relief and how long you have held them, not on the sale price itself.
The beginner guides explain what a secondary is. This piece owns the part they leave out: how the sale is actually taxed, where the EIS three-year rule flips the answer, and the practical frictions that decide whether a pre-exit sale can happen at all.
A secondary is a disposal. The tax follows the shares, and the clock they sit on.
Do you pay tax when you sell angel shares before an exit?
Yes. Selling shares in a private company is a disposal for capital gains tax, whether the buyer is a new investor, an existing shareholder or a secondary fund. You are taxed on the gain, meaning the sale price less what you paid and any allowable costs, not on the whole proceeds.
For 2026/27, capital gains tax on shares is 18% within your basic-rate band and 24% on gains above it, and the first £3,000 of gains each tax year is exempt. The gain stacks on top of your income, so a large secondary can push part of it into the 24% band even when your salary sits in the basic-rate band. That is the default for an ordinary shareholding. What follows is where the two HMRC schemes bend the answer. If you need the mechanics of what a secondary is and how one comes together, the secondary sales page covers that groundwork.
Is selling EIS or SEIS shares tax-free?
It can be, if you have held qualifying shares for at least three years and kept the income tax relief. A gain on EIS shares on which income tax relief was given, and not later withdrawn, is exempt from capital gains tax once you are past the three-year point. SEIS works the same way. Sell earlier and the position reverses.
The three-year clock runs from when the shares were issued, or from when the company started trading if that is later. HMRC's Venture Capital Schemes Manual is explicit that there is no disposal relief on a gain made within three years, and that selling EIS shares inside that window means the income tax relief is wholly or partly withdrawn. So an early secondary can cost you twice: the gain becomes taxable and the relief you already banked is clawed back.
The exemption, reinvestment relief and deferral relief each have their own walkthrough on the CGT and SEIS/EIS page. For a secondary, the point is timing: the same shares sold on either side of the three-year line are taxed in completely different ways.
Does Business Asset Disposal Relief apply to an angel's shares?
Rarely, for a typical minority angel stake. Business Asset Disposal Relief cuts the capital gains tax rate to 18% from 6 April 2026, on up to a £1 million lifetime limit of qualifying gains, but the conditions are demanding and most angel holdings miss them.
For shares, BADR generally needs you to hold at least 5% of the ordinary share capital and voting rights, for the company to be your personal trading company, and for you to be an officer or employee, throughout a two-year qualifying period. A passive angel with a small percentage and no board seat usually meets none of that. Founders, and some very active angels, sometimes do. The BADR page sets out the tests in full. The practical read for most secondaries is that the standard 18% and 24% rates apply, not the relief.
What practical frictions hit a secondary sale?
Tax is only half the problem. A private secondary also has to clear the company's own rules and find a buyer, and either can stop a sale before tax ever enters the picture. Most shareholder agreements carry pre-emption rights and require board or company consent before a transfer.
Three things tend to bite:
- Pre-emption and consent. Existing shareholders may have first refusal, and the board may need to approve the transfer. Read the articles and the shareholders' agreement before you assume the sale is yours to make.
- Price discovery. There is no public market. Price is negotiated, often off the last round, and a buyer may want a discount for illiquidity and thin information rights.
- Who can legally buy. Marketing an unlisted holding runs into the financial promotion rules, so buyers are usually limited to existing holders, certified high-net-worth or self-certified sophisticated investors, or a secondary fund.
None of this changes the tax rate. It changes whether, when and at what price a sale happens, which is what actually sets the size of the gain.
How do you get the timing and the advice right?
The honest answer is that it depends on your own position: the scheme the shares sit under, how long you have held them, your other gains that year, and the price on the table. Those are the variables to weigh, and they point different ways for different people. Whether to take a secondary at all is a separate question, covered in when to sell a winner and when to hold.
What the rules make clear is that timing does most of the work. The same EIS shares are exempt on one side of the three-year line and taxable, with relief clawed back, on the other. A large gain can straddle the 18% and 24% bands. And the £3,000 annual exempt amount, along with which tax year a disposal lands in, are levers an adviser can model against your wider position before anything is sold.
This is general information, not financial or tax advice. Capital gains tax treatment depends on your circumstances and the scheme rules, and both change with each Budget. Confirm the current position at GOV.UK and take advice from an FCA-regulated adviser or a qualified tax adviser before you act.
Frequently asked questions
Do I pay capital gains tax on selling startup shares?
Usually, yes. Selling shares in a private company is a disposal for capital gains tax, so you are taxed on the gain (the sale price less cost and allowable expenses). For 2026/27 the rate is 18% within your basic-rate band and 24% above it, after a £3,000 annual exempt amount. Qualifying EIS and SEIS shares can be exempt if held long enough.
Is selling EIS shares tax-free?
It can be. If you have held qualifying EIS shares for at least three years and kept the income tax relief, the gain on disposal is exempt from capital gains tax under HMRC's rules. SEIS works the same way. The exemption depends on income tax relief having been given and not withdrawn on those shares.
What happens if I sell EIS shares within three years?
You lose both benefits. HMRC's Venture Capital Schemes Manual states there is no disposal relief on a gain made within three years of the shares being issued, so the gain is taxable, and selling inside three years means the income tax relief is wholly or partly withdrawn. Timing changes the tax in two directions at once.
Does Business Asset Disposal Relief apply to angel shares?
Usually not for a passive minority stake. BADR cuts the rate to 18% from 6 April 2026 on up to £1 million of lifetime gains, but for shares you generally need at least 5% of the company, for it to be your personal trading company, and to be an officer or employee for a two-year qualifying period. Most angels meet none of these; some founders and very active angels do.
Is this financial or tax advice?
No. This is general information about how UK tax rules treat a pre-exit secondary sale, not financial or tax advice. Your position depends on the scheme, your holding period and your wider gains, and the rules change with each Budget. Confirm the current position at GOV.UK and take advice from an FCA-regulated adviser or a qualified tax adviser before acting.