ISA Deadline Investing: How to Deploy £20K Before 5 April
With the ISA deadline approaching, how should a value investor deploy their full £20,000 allowance? A practical framework.
The ISA deadline — 5 April 2026 — is six weeks away. The annual £20,000 allowance is use-it-or-lose-it. For a value investor running a net-net basket, the question isn't whether to invest, but which framework to use when deploying a full year's allowance in a compressed window.
The Lump-Sum vs DCA Debate
Academic research consistently shows that lump-sum investing on day one of the tax year outperforms drip-feeding (pound-cost averaging) approximately 67% of the time, simply because markets rise more often than they fall. But a value investor has a higher bar: we only want to deploy into stocks at or below intrinsic value. The ISA deadline creates useful discipline — it forces a decision rather than endless waiting.
Use DipBuster's screener to identify 10–15 current net-net candidates. Do your research over the next 4 weeks.
Step 2 — Set limit orders at your price
For each candidate, determine the maximum price you'd pay (typically NCAV per share). Set a limit order.
Step 3 — Deploy by 5 April regardless
If your limit orders haven't filled by 1 April, deploy into the best available names at market. The ISA tax shelter compounds more value over time than an extra 2% discount at entry.
Which ISA Platform for a Net-Net Strategy?
AIM stocks qualify for ISA inclusion and for Business Property Relief (IHT exemption after 2 years). For a basket of UK net-nets, a platform with low AIM dealing costs is essential — the difference between a £10 flat deal and a 0.5% ad-valorem fee is substantial when you're making 15 separate purchases. Interactive Investor, AJ Bell and Freetrade are the most commonly used by the DipBuster community for AIM ISA strategies.
Tax-Loss Harvesting Before 5 April
If you're holding losing positions outside an ISA, April is the time to crystallise losses against any gains elsewhere in your portfolio. You can then immediately repurchase inside an ISA, giving the holding a clean tax status going forward. The "bed and ISA" strategy is explicitly permitted by HMRC.
Disclaimer: Not financial advice. DipBuster is an information platform. Always do your own research before investing.