The Wheel Strategy and UK CGT: How the Tax Works
The wheel strategy sells a cash-secured put, takes assignment, sells a covered call against the shares, gets called away, and repeats. For UK Capital Gains Tax the awkward part is timing. Each premium is taxed the moment you write the option, but if that option is exercised, the premium is later folded back into the shares.
Writing an option is a disposal in its own right. If the option is exercised, the grant is unwound and merged with the share trade it produced. That comes from section 144 TCGA 1992, worked through in HMRC's CG12351.
The example below stays in sterling to keep the numbers clear. Real wheel positions are usually in dollars, where each leg converts at HMRC's monthly rate, as the main options guide explains.
Selling a cash-secured put: taxed when you write it
You sell a put with a £100 strike and collect £300 in premium. Writing the option is a disposal, so the £300 is a chargeable gain in the tax year you wrote it. There is no matching cost, so the whole premium is taxable. If the put expires worthless, that is where it ends. You keep the £300 and the gain stands.
Getting assigned: the premium cuts your cost
If the stock falls and you are assigned, you buy 100 shares at the £100 strike, for £10,000. Now the grant is unwound. The £300 premium is no longer a gain on its own. It comes off the cost of the shares, so your cost basis is £9,700. HMRC treats the option and the share purchase as one transaction, and the £300 you already reported is set off or repaid.
Selling a covered call: taxed when you write it
You hold 100 shares. You sell a call against them at a £110 strike and collect £250. The rule is the same as the put. Writing the call is a disposal, so the £250 is a chargeable gain in the year you wrote it. If the call expires worthless, you keep the £250 and the shares, and the wheel turns again.
Getting called away: the premium adds to your proceeds
If the stock rises through £110, the call is exercised and your shares are sold at the strike, for £11,000. The grant unwinds again, but a written call works the opposite way to a written put. The £250 premium is added to your proceeds, not taken off your cost. Your proceeds are £11,250, and the £250 you reported for writing the call is unwound into this sale.
The full loop in numbers
| What you do | CGT treatment |
|---|---|
| Sell a £100 put, collect £300 premium | £300 gain, taxed in the year you wrote it |
| Assigned: buy 100 shares at £100 = £10,000 | Premium comes off the cost, so cost is £9,700; the £300 gain is unwound |
| Sell a £110 covered call, collect £250 premium | £250 gain, taxed in the year you wrote it |
| Called away: sell 100 shares at £110 = £11,000 | Premium adds to the proceeds, so proceeds are £11,250; the £250 gain is unwound |
| Chargeable gain on the shares | £11,250 − £9,700 = £1,550 |
The chargeable gain on the shares is £1,550. That is the £1,000 the shares rose, plus £300 of put premium that lowered the cost, plus £250 of call premium that raised the proceeds. Both premiums looked like income when you collected them, but they end up inside a single share disposal. That is why a running total in your head rarely matches the return.
This clean loop assumes you hold no other shares of the same company. If you do, the assigned shares join your Section 104 pool, and the called-away sale is matched under the pooling and 30-day rules rather than netting against that one £9,700 lot.
The cross-tax-year amendment trap
Say you sold the put in 2025/26 and reported the £300 gain, then took assignment in 2026/27. The unwinding happens in 2026/27, but the reported gain sits in 2025/26, so putting it right can mean amending the earlier return. Any option written near a tax-year boundary can reach back like this once it is exercised. Options that lapse never do. Only exercise triggers the unwind.
Why the wheel is hard to track by hand
One turn is easy to follow. The wheel is built to repeat: dozens of puts and calls a year, often across several tickers, usually in dollars. Some premiums stay as gains because the option lapsed. Others disappear into a share cost or a sale price because it was exercised. A few reach back into a prior year. Your broker gives you fills, not disposals, so none of it arrives labelled.
Our CGT Calculator treats each option as its own asset, keeps lapsed premiums as gains, folds exercised premiums into the matching share trade, and converts every dollar leg at HMRC's monthly rate. Upload a broker export and the wheel comes out as plain disposals.
Sources and further reading
- Section 144 TCGA 1992 — options: grant, exercise, and abandonment
- HMRC CG12300 — Capital Gains Manual: options, introduction
- HMRC CG12351 — worked example: put option (grant and assignment)
- HMRC CG55536 — traded options: tax treatment summary
- Options and UK Capital Gains Tax — the full rules for buying, selling, exercising and writing