Koinly review 2026: best UK crypto tax software for HMRC?

Koinly is our top-rated crypto tax tool for UK filers in 2026, scoring 9.7/10. After running a real portfolio across Coinbase, Binance, Kraken and a couple of self-custody wallets through it, the verdict is that no other tool gets HMRC's share-pooling and 30-day rule as right, as quickly, with as little manual cleanup. If you need a Self Assessment-ready Capital Gains Summary in pounds, this is the default choice.

Koinly in two sentences

What is Koinly?

Koinly is a Dublin-built crypto tax calculator launched in 2018, used by hundreds of thousands of filers across the UK, Ireland, Australia, Germany and the US. It connects to more than 800 exchanges, 100+ wallets and 170+ blockchains, ingests every buy, sell, swap, transfer, staking reward and airdrop, and outputs a country-specific tax report. For UK users that means a HMRC Capital Gains Summary, an income report for staking and mining, and all the supporting working papers an accountant could ask for.

The product has matured through several UK tax years now, and the share-pooling logic, in particular, has been battle-tested. That matters: HMRC's matching rules are not the FIFO most US-built tools default to, and getting them wrong can quietly inflate or understate your gain by a meaningful amount.

UK-relevant features

• HMRC matching rules built-in. Same-day rule, 30-day bed-and-breakfasting and the Section 104 pool are applied automatically in the correct order. You can override individual lots if you have a reason to.
• Capital Gains Summary. A one-page PDF with totals that map directly onto SA108 boxes 14–22 (number of disposals, disposal proceeds, allowable costs, gains, losses, gains in the year before losses).
• Income report. Staking, mining, lending interest, airdrops and referral rewards are valued at the GBP price on the day received, ready for the Other UK Income section of the SA100.
• 3,000 pound annual exempt amount tracking. The dashboard shows your live taxable gain so you can see whether you are above or below the 2025/26 allowance before you trigger another disposal.
• Lost / stolen / negligible value. A built-in transaction tag for negligible value claims and for the 165 / Section 24 negligible value election that HMRC accepts on dead tokens.
• 1,000+ integrations. Coinbase, Coinbase Pro, Binance, Kraken, Crypto.com, Bitstamp, Gemini, Bitfinex, KuCoin, OKX plus Ledger, Trezor, MetaMask, Phantom and the major DeFi protocols.
• Accountant access. Read-only invite for your accountant, with a UK-tax-year switcher (6 April–5 April) and a downloadable transaction CSV.

Pricing and free tier

Koinly's pricing is per tax year, and the free tier is genuinely useful: you can connect every exchange and wallet, see the full report, and only pay if you actually need to export the figures. Below are 2025/26 list prices in pounds; promotional pricing during Self Assessment season is common.

One quirk worth knowing: you pay per tax year, not per subscription. If you need to refile a previous year, that's a separate purchase. In return, you keep your data and report in your account indefinitely.

Our test

We rebuilt a UK investor's 2024/25 portfolio in Koinly: roughly 320 transactions across Coinbase (GBP fiat ramp), Binance (alt trading), Kraken (staking) and Crypto.com (the Visa card), plus a Ledger holding BTC and a MetaMask wallet with a small DeFi position on Arbitrum. Onboarding took about 35 minutes — most of that was just generating read-only API keys on the exchanges.

Koinly synced the data, flagged 14 missing-cost-basis warnings (mostly internal transfers it could not yet pair), and walked us through resolving each one in the "Review" tab. The 30-day rule fired on three trades where we'd sold ETH and re-bought within a week, and Koinly correctly matched those disposals against the re-acquisition before touching the Section 104 pool. We checked the maths by hand on two of them — it lined up with HMRC's example in CG78310.

The final Capital Gains Summary came out as a clean two-page PDF: total disposal proceeds, total allowable costs, a rolled-up gain figure, and a separate working paper listing every disposal with date, asset, proceeds, cost and gain/loss. We dropped the four totals straight into SA108 boxes 14, 15, 16 and 17 and were done.

Income side: 0.18 ETH of Kraken staking rewards came through valued at the GBP spot price on the day received, ready for the "other taxable income" box. No manual valuation needed.

Pros and cons

Our verdict

For a UK filer in 2026, Koinly is the right answer in nine cases out of ten. It is the only tool we tested that gets HMRC's ordering rules right out of the box, the only one whose report maps cleanly to SA108 without re-typing, and the only one that lets you confirm you're under the £3,000 annual exempt amount before spending anything. The Newbie plan covers most casual investors, and even the Trader tier at around £159 is easily justified once you account for the time it would take to do share-pooling by hand.

If you have fewer than 25 transactions and want the cheapest paid plan, look at our Coinpanda review. If you also use TurboTax in the US, consider CoinLedger. For everyone else filing a UK Self Assessment with crypto on it, Koinly is the default.

Read our full UK crypto tax guide for the background on share-pooling, the 30-day rule and what HMRC actually expects in the SA108 boxes.