Comparison · Investing · 2026
ISA vs General Investment Account 2026: Which Is Better?
Same shares, same fund, same growth — but a very different tax bill, depending on the wrapper. Hold investments in a stocks and shares ISA and every penny of growth, dividends and gains is tax-free, capped only by the £20,000 annual allowance. Hold them in a general investment account (GIA) and you get just the £500 dividend allowance and the £3,000 capital gains exemption; beyond that, dividends are taxed at 10.75%, 35.75% or 39.35% and gains at 18% or 24%. This 2026/27 comparison shows how the gap compounds over ten years — and how bed-and-ISA can move existing GIA holdings into the shelter.
TL;DR — 30-Second Summary
- • ISA: all dividends and gains tax-free, but £20,000/year limit
- • GIA: no limit, but taxable — £500 dividend allowance, £3,000 CGT exemption
- • GIA dividends: 10.75% / 35.75% / 39.35% above the allowance
- • GIA gains: 18% / 24% above the £3,000 exemption
- • Rule of thumb: fill the ISA first; use the GIA for the overflow
How Each Account Is Taxed
- • Dividends: tax-free
- • Capital gains: tax-free
- • Interest: tax-free
- • No reporting on a tax return
- • £20,000 annual contribution cap
- • Dividends: £500 free, then 10.75% / 35.75% / 39.35%
- • Gains: £3,000 free, then 18% / 24%
- • Interest: taxed via Personal Savings Allowance
- • May need to report on Self Assessment
- • No contribution limit
The Allowances That Make a GIA Bearable
A GIA is not taxed from the first pound. Two allowances cushion modest portfolios in 2026/27:
- Dividend allowance — £500: the first £500 of dividends is tax-free. Above it, you pay 10.75% (basic), 35.75% (higher) or 39.35% (additional). The allowance has shrunk sharply from £2,000 in recent years.
- Capital gains annual exempt amount — £3,000: the first £3,000 of gains in a year is tax-free. Above it, gains on shares and funds are taxed at 18% within the basic-rate band and 24% above it.
For a basic-rate investor with a small portfolio, these allowances can shelter most of the annual return — but as the pot grows, the tax drag in a GIA mounts. Inside an ISA, the same dividends and gains face no tax at all. See the capital gains tax detail and the dividend tax guide.
A 10-Year Comparison
Imagine a higher-rate investor with £100,000 invested, growing at roughly 7% a year, of which about 3% is dividends and 4% capital growth. The ISA pays no tax; the GIA pays dividend tax above £500 and CGT above £3,000 on realised gains. Over a decade, that tax drag compounds:
| After 10 years | ISA (tax-free) | GIA (taxed) |
|---|---|---|
| Dividends taxed each year | £0 | ~35.75% above £500 |
| Gains on eventual sale | £0 | 24% above £3,000 |
| Approx. value retained | ~£197,000 | ~£183,000 |
The figures are illustrative, but the direction is reliable: a higher-rate investor can lose roughly £14,000 over ten years on a £100,000 pot simply by holding it in a taxable GIA rather than an ISA — and the gap grows with the portfolio and the holding period. Reinvested dividends taxed each year are the biggest culprit. Model your own with the capital gains tax calculator and dividend tax calculator.
Bed-and-ISA: Moving Holdings into the Shelter
If you already hold investments in a GIA, you do not have to leave them exposed. Bed-and-ISA sells the holdings in the GIA and immediately repurchases them inside your ISA, using your £20,000 annual allowance.
The sale is a disposal for CGT, so any gain counts towards your £3,000 annual exemption. Keep the realised gain within £3,000 and there is no tax to pay; once inside the ISA, all future growth, dividends and gains are tax-free forever. Many platforms automate the buy-back to minimise time out of the market.
For a larger GIA, a popular tactic is to bed-and-ISA in stages across several tax years, using each year's £3,000 CGT exemption and £20,000 ISA allowance to migrate holdings without triggering a tax bill. The cash ISA vs stocks & shares ISA comparison covers which ISA to use.
Which Should You Choose?
For almost everyone, the answer is: fill the ISA first. Its tax-free treatment makes it the most efficient home for long-term investments, and the £20,000 annual allowance is generous. A GIA earns its place only once your ISA allowance is fully used, when you need to hold something an ISA cannot, or when you value unlimited, flexible contributions. If you hold investments in a GIA today, bed-and-ISA them across into the wrapper — staged over tax years to stay within the £3,000 CGT exemption — and shelter the future growth from tax for good.