How much capital gains tax do I pay in the UK?

For disposals of shares, funds, and ETFs in 2026/27, taxable gains are generally charged at 18% to the extent they fall within the unused basic-rate band and 24% above it. The individual annual exempt amount is £3,000.

What is the capital gains tax allowance for 2026/27?

The individual annual exempt amount for the 2026/27 tax year is £3,000. It was £6,000 in 2023/24 and £12,300 in 2022/23.

How does the 30-day bed and breakfast rule work?

If you sell shares and repurchase shares of the same type within 30 days, the sale is matched with the subsequent purchase for CGT purposes. This anti-avoidance rule prevents investors from selling to realise a loss and immediately rebuying. FiscalFox applies this rule automatically.

Do I need to file SA108 for capital gains?

If you are registered for Self Assessment, you generally need to report gains when taxable gains exceed the annual exempt amount, when total disposal proceeds exceed £50,000 for 2023/24 onwards, or when you need to claim allowable losses or make another capital gains claim.

What does FiscalFox calculate for UK shares?

FiscalFox is a specialist UK capital gains tax calculator for share investors. It applies same-day matching, the 30-day bed and breakfast rule, and Section 104 pooling, then generates SA108-ready supporting reports. It has 13 built-in imports: Vanguard, Hargreaves Lansdown, Freetrade, Trading 212, eToro, InvestEngine, Moneybox, Saxo Bank, Interactive Brokers, Robinhood, Revolut, AJ Bell, and IG.

How do I report share sales to HMRC?

Share sales are reported on the SA108 supplementary pages of your Self Assessment tax return. You need to calculate the gain or loss on each disposal using HMRC's share matching rules, then enter the totals on SA108. The deadline is 31 January following the end of the tax year. FiscalFox can generate the SA108 schedules automatically from your broker export files.

Do I need to pay capital gains tax if my gains are under GBP 3,000?

If your total taxable gains are under the annual exempt amount, you do not owe CGT on those gains. If you are registered for Self Assessment, you may still need to report when total disposal proceeds exceed GBP 50,000 for 2023/24 onwards, or to claim allowable losses.

How do I calculate capital gains on shares?

Capital gains on shares are calculated as disposal proceeds minus allowable costs. HMRC requires same-day matching first, then acquisitions in the following 30 days, then Section 104 pooling. FiscalFox automates imported transaction matching and the current-year estimate. A brought-forward capital-loss balance must currently be applied separately.

What is the Section 104 pooling rule?

The Section 104 pool is a running average cost calculation for shares of the same type. When you buy shares, the cost is added to the pool. When you sell shares not matched by the same-day or 30-day rules, the cost is calculated as a proportion of the total pool cost based on the number of shares sold.

What are the current UK CGT rates?

From 30 October 2024: 18% for basic rate taxpayers and 24% for higher/additional rate taxpayers on shares and other assets. Before 30 October 2024: 10% and 20% respectively. Residential property has different rates.

What is the same-day rule for capital gains?

The same-day rule requires that if you sell shares and buy shares of the same type on the same day, the sale is matched with the same-day purchase for CGT purposes, regardless of the order of transactions during the day.

Can I carry forward capital losses?

Yes. If your capital losses exceed your capital gains in a tax year, you can carry forward the excess losses to offset against future capital gains indefinitely. You must report the losses to HMRC within 4 years of the end of the tax year in which they arose.

Is it really free to start?

Yes. Capital gains calculations are completely free, including calculations across multiple broker files. The one-time £29.99 payment is only needed to download the HMRC report pack, and unlocks the selected tax year plus earlier years in the calculation. There is no subscription.

Do you support my broker?

FiscalFox has 13 built-in broker imports: Vanguard, Hargreaves Lansdown, Freetrade, Trading 212, eToro, InvestEngine, Moneybox, Saxo Bank, Interactive Brokers, Robinhood, Revolut, AJ Bell, and IG. Other supported transaction files can use the opt-in AI import path after sign-in and consent.

Does FiscalFox apply HMRC share matching rules and protect data?

FiscalFox applies same-day, following-30-day and Section 104 matching in HMRC's prescribed order. Built-in broker parsing runs in the browser where possible; signed-in storage and opt-in AI parsing are described in the privacy policy. FiscalFox is a calculation tool, not tax advice or an HMRC submission.

When did CGT rates change in the UK?

The most recent change was on 30 October 2024, when the Autumn Budget increased CGT rates on shares from 10%/20% to 18%/24%. The annual exempt amount was reduced from £12,300 to £6,000 in April 2023, and further reduced to £3,000 in April 2024.

How do I know FiscalFox's calculations are correct?

FiscalFox applies the exact same share-matching rules HMRC uses to verify Self Assessment returns: same-day matching, 30-day bed and breakfast rules, and Section 104 pooling, in the correct priority order. Every disposal is traced and the calculations are defensible if you are ever questioned.

When do I need to pay for the report pack?

The free tier lets you calculate and view your capital gains on-screen. Pay £29.99 only when you want the downloadable HMRC-ready PDF and CSV report pack. The payment unlocks the selected tax year and every earlier year contained in the calculation.

Is there a subscription?

No. The report pack is a one-time £29.99 payment with no recurring charge. You can download the unlocked reports again whenever you need them.

What happens if my capital gains are wrong on my tax return?

If HMRC finds an error in your Self Assessment, you pay the extra tax plus interest, and a careless mistake can carry a penalty of up to 30% of the underpaid tax. Most DIY errors come from missing the same-day and 30-day matching rules. FiscalFox applies them automatically and keeps the workings behind every disposal so you can evidence your figures.

Webull Capital Gains Tax Calculator UK

FiscalFox supports Webull as a built-in broker import. Upload a Webull stock or options order-history file and FiscalFox identifies each security, converts supported GBP values, preserves separate option contracts, and applies the UK same-day, 30-day and Section 104 matching sequence.

How to export Webull transaction history

Webull documents an Export Orders route in both its app and desktop platform. The exported CSV is normally delivered by email after the request is submitted. See Webull's current transaction-history instructions if the menu wording in your account has changed.

In the Webull app, choose Account, select the account, then open History.
Choose Export Orders using the download icon.
On desktop, open Account, use the Orders widget menu, then choose Export Orders.
Request the widest available period so earlier acquisitions are not omitted.
Upload the original CSV, XLS, or XLSX using the Webull option in FiscalFox.

Include the history behind every disposal

A tax-year-only file can show an option close or share sale without the earlier opening transaction. That produces a missing-acquisition review item because the cost cannot be reconstructed from the shortened export.

Webull columns FiscalFox recognises

FiscalFox recognises both the original Webull direction codes and normalised buy/sell versions:

Webull field	Purpose
Ticker or Symbol & Name	Stock ticker or complete listed-option contract code
Date or Trade Date	The acquisition or disposal date
Buy/Sell or BTO/STC	Trade direction and long-option lifecycle
Quantity and Multiplier	Share quantity or number of option contracts
Net Amount	Broker consideration after the fee effect
Amount GBP or Spot FX rate	Sterling value used for the UK calculation

How Webull options are kept separate

A ticker such as BITF 280121C00012000 contains more than the underlying symbol. It identifies the expiry, call or put right, and strike. FiscalFox uses all of those fields as the security identity, so different BITF contracts traded on the same day are not merged or deleted as duplicates.

Supported long-option BTO rows become acquisitions and STC rows become disposals. Written-option STO and BTC activity can require different lifecycle treatment, so it remains a manual-review item rather than being silently forced into share pooling.

GBP conversion and review warnings

UK capital gains calculations must use sterling values. FiscalFox first uses an explicit Amount GBP. If that is absent, it can use a usable Spot FX rate. A source-currency-only Webull row is retained so the trading history stays complete, but it is marked for GBP conversion review before the figures are used for filing.

Common Webull import issues

Duplicated PDF-page sheets

Some converted Webull workbooks contain a clean WebullOptions or Webull Stocks sheet plus auxiliary sheets named like Table003 (Page 2). FiscalFox uses the canonical Webull sheet and ignores those repeated page tables.

Missing option opening trades

If an STC row has no matching BTO quantity, FiscalFox reports missing option history. It does not interpret a contract-count imbalance as an ordinary stock split.

Account wrappers

Only include activity that belongs in the UK taxable calculation. Keep ISA, pension and other tax-sheltered activity separate from a taxable brokerage account.

Webull CGT questions

Does FiscalFox support Webull files?

Yes. FiscalFox has a built-in Webull parser for stock order history and supported long-option trades in CSV, XLS, or XLSX files. The import runs locally in the browser.

Which Webull file should I upload for UK capital gains tax?

Upload the Webull order or transaction history covering the complete period needed to explain every disposal. The file should contain Ticker, Date, Buy/Sell or BTO/STC, Quantity, Net Amount, and Currency columns.

Does FiscalFox support Webull options?

FiscalFox imports supported long-option BTO and STC rows using the full contract identity: underlying, expiry, call or put, and strike. Written-option STO and BTC lifecycle rows remain manual-review items.

How are USD Webull trades converted to GBP?

FiscalFox uses Amount GBP when present, otherwise it uses a usable Spot FX rate. If the file only contains a USD net amount, the trade is imported but clearly flagged for GBP conversion review before filing.

Ready to check the file? Open the Webull capital gains calculator, upload the export, and review the calculation before paying for a report.