Cost basis calculator
Enter your buys and sells and see your gain under FIFO, LIFO and HIFO side by side.
Free tools for crypto finance teams
Crypto tax, accounting and treasury tools, free.
Estimate cost basis, UK, US and South Africa tax, journal entries and runway. No account needed.
No tools match that. Try a simpler word, like tax or gas.
Calculators run on your device. Only a live lookup goes to a public data service, and never to Deciphr.
No account needed.
Most calculators show how each result was reached.
Estimates for information only. Not financial, tax, accounting, legal or investment advice. Read the terms.
Tax
Capital gains, income and the rules that trip people up.
UK crypto tax calculator
Apply HMRC's same-day, 30-day and Section 104 pool rules to your trades, with every match shown.
UK
US gains and Form 8949 preview
Split your sales into short-term and long-term and see them laid out like Form 8949.
US
South Africa crypto tax
Estimate tax on a crypto gain as capital or revenue in nature, using the SARS figures.
ZA
Capital gains tax by country
Estimate capital gains tax on a gain in the UK, the US or South Africa.
UK, US, ZA
Gas fee tax calculator
Work out the gain or loss on the coins you spent paying a network fee.
UK, US
Staking and airdrop income
Value coins you received on the day you got them, and see the income and the cost of the new coins.
UK, US
30-day rule checker
Check whether a UK buy-back is matched to your sale, and what that does to the gain.
UK
Tax-loss harvesting estimator
See which holdings are below cost and your total unrealised loss, with the limits on using it.
UK, US, ZA
Is my bridge or wrap taxable?
See what published tax guidance says, and does not say, about bridging and wrapping.
UK, US, ZA
Accounting
For accountants and finance teams closing the books on crypto.
Crypto journal entry generator
Pick a common crypto event and get the textbook debits and credits.
Crypto chart of accounts
A generic starting list of 34 accounts for a business that holds crypto, to adapt with your accountant. It is not set up for any one accounting system.
CSV
Month-end close checklist
Work through 16 close steps in order. Your ticks are saved in this browser.
US GAAP fair value (ASU 2023-08)
Work out the period-end fair value change on a crypto holding and the entry to book it.
US GAAP
IFRS impairment and reversal
Work out an impairment or a reversal for a cryptocurrency holding under the IAS 38 cost model.
IFRS
Currency translation (IAS 21)
Translate a small USD trial balance into GBP, EUR or ZAR and see the cumulative translation reserve.
IAS 21
Is this asset in scope?
Answer the six criteria in ASC 350-60-15-1 for an indication of whether a crypto asset falls under ASU 2023-08.
US GAAP
Reconciliation
Compare each wallet balance on the chain to your ledger and see which rows are off.
Invoice to crypto amount
Convert a USD invoice into a token amount at the rate you choose.
Audit-readiness self-check
Answer ten questions on your crypto records and controls and see where the gaps are.
Treasury
Runway and risk for founders and finance leads.
Runway stress test
See how many months of runway you keep if markets fall and spending rises.
Runway calculator
Enter your holdings and recent monthly spend to get months of runway and a run-out month.
Runway range simulator
Run hundreds of random market paths to see a low, middle and high estimate of your runway.
Token sell price impact
Estimate how much a token sale could move the price, using the square-root rule.
Stablecoin peg tracker
Check how close major stablecoins are to $1 right now.
Treasury mix health check
Enter your holdings and see what share sits in cash, majors, your own token and other locked tokens.
Vesting and unlock schedule
Lay out a token vesting schedule month by month, with a cliff and a straight-line unlock.
On-chain
Paste a public wallet address. Your browser asks public blockchain services directly, and Deciphr never sees the address.
Multi-chain balance checker
Paste a public address and see its native coin balance on every chain we can read.
Gas spent calculator
Add up the gas an Ethereum address has paid on the transactions it sent, including failed ones.
Ethereum
Historical price lookup
Look up a token price at a past minute from one named source, and see exactly when that data point is from.
Your crypto year in review
See one year of an Ethereum address in plain facts, with a card you can share.
Ethereum
Crypto accounting glossary
The words you'll meet, in a line or two each.
- 30-day rule
- A UK rule for individuals. A disposal is matched with the same token bought in the following 30 days, before the Section 104 pool is used.
- Airdrop
- Tokens sent to wallets without a direct purchase, often to promote a project or reward past users.
- ASU 2023-08
- A FASB update to US GAAP on crypto assets. In-scope assets are measured at fair value, with changes in net income, for fiscal years beginning after December 15, 2024.
- Block explorer
- A website that shows public blockchain data, including transactions, addresses and balances.
- Bridge
- A service that moves value between blockchains. It usually locks or burns a token on one chain and releases or issues a matching token on the other.
- Burn
- In treasury reporting, the net cash a business spends in a period, usually a month. In token terms, burning also means permanently removing tokens from supply.
- Chart of accounts
- The numbered list of accounts a business uses to record its transactions in the general ledger.
- Cliff
- The period at the start of a vesting schedule when nothing vests. A first block usually vests when it ends.
- Cost basis
- The amount treated as the cost of an asset when working out a gain or loss. It usually includes the purchase price and may include some fees.
- Custody
- Holding assets on behalf of someone. For crypto, a custodian controls the private keys for its client.
- Disposal
- Selling, exchanging, spending or giving away an asset. Tax rules set out which events count as a disposal.
- Fair value
- The price that would be received to sell an asset in an orderly transaction between market participants at the measurement date.
- FIFO
- First in, first out. The earliest units bought are treated as the first units sold.
- Form 8949
- The US tax form used to report sales and other disposals of capital assets. Totals carry to Schedule D.
- Functional currency
- The currency of the main economic environment in which a business operates. Its transactions are measured in this currency.
- Gas
- The fee paid to a blockchain network to process a transaction. It is usually paid in the network's native token.
- Hard fork
- A change to a blockchain's rules that older software does not accept. It can split one chain into two and create a new token.
- HIFO
- Highest in, first out. The units with the highest cost are treated as the first units sold.
- IAS 2
- The IFRS standard on inventories. Under a 2019 IFRS Interpretations Committee decision, it applies to cryptocurrencies held for sale in the ordinary course of business.
- IAS 21
- The IFRS standard on the effects of changes in foreign exchange rates. It covers foreign currency transactions and translation into a presentation currency.
- IAS 38
- The IFRS standard on intangible assets, with a cost model and a revaluation model. Under a 2019 IFRS Interpretations Committee decision, it applies to cryptocurrencies that are not inventory, where the holding creates no contract with another party. Other tokens need their own analysis.
- Impairment
- A write-down made when an asset's carrying amount is higher than the amount that can be recovered from it.
- Journal entry
- A dated accounting record with debit and credit lines. Total debits equal total credits.
- LIFO
- Last in, first out. The most recent units bought are treated as the first units sold.
- Liquidity
- How easily an asset can be bought or sold without moving its price much.
- Multisig
- A wallet that needs approval from several keys to move funds, for example three of five signers.
- Off-chain
- Activity recorded outside a blockchain, such as a trade on an exchange's internal ledger or a signed contract.
- On-chain
- Activity recorded on a blockchain, where the public record can be checked with a block explorer.
- Presentation currency
- The currency in which financial statements are presented. It can differ from the functional currency.
- Price impact
- The change in market price caused by a trade itself. Larger trades in thinner markets usually have a larger impact.
- Realized gain
- A gain from a disposal, usually the proceeds less the cost basis of the units disposed of. Books kept at fair value or after impairment measure the gain on sale from the carrying amount, so the two figures can differ.
- Reconciliation
- Comparing two records of the same balance, such as the blockchain and the ledger, then explaining any difference.
- Runway
- How many months a business can keep operating at its current burn. It is usually liquid resources divided by monthly burn.
- Same-day rule
- A UK rule. A disposal is first matched with the same token bought on the same day by the same person.
- Section 104 pool
- A UK tax pool for a token. Units sit together at their average allowable cost, and each disposal not matched by another rule takes a share.
- Self-custody
- Holding your own private keys, so no third party controls your assets. You also carry the risk of losing the keys.
- Smart contract
- A program stored on a blockchain that runs when called, following its code.
- Stablecoin
- A token designed to hold a steady value against a reference asset, usually a currency such as the US dollar. Its market price can still move away from that value.
- Staking
- Committing tokens to help secure a proof-of-stake network, usually in return for rewards.
- Token unlock
- A date when previously locked tokens become free to transfer. Large unlocks can add to the supply available for sale.
- Trial balance
- A list of every general ledger account with its debit or credit balance at a date. Total debits equal total credits.
- Unrealized gain
- The increase in value of an asset still held: its current value less its cost basis or carrying amount.
- Vesting
- A schedule that sets when a person or investor earns the right to tokens or shares, usually over time.
- Wallet
- Software or hardware that holds the private keys for blockchain addresses and signs transactions.
- Wrapped token
- A token that represents another asset on a blockchain, usually redeemable for that asset. WETH, which represents ether, is a common example.
Tax deadlines
The usual filing dates for individuals. Check the linked source each year, because dates can move.
UK Self Assessment
- 6 April to 5 April
- The tax year. The dates below fall after it ends.
- 5 October
- Register for Self Assessment, if you need to file and did not file last year.
- 31 October
- File a paper return.
- 31 January
- File online and pay the tax you owe.
- 31 July
- Make the second payment on account, if you make them.
- 31 December, then 31 January
- If you use the real time Capital Gains Tax service instead (UK residents): report by 31 December in the tax year after the gain, and pay by 31 January. If you also file a Self Assessment return, check GOV.UK, because the gain may need to go on it too.
- From 2024 to 2025
- Self Assessment returns have a cryptoasset section. Complete it in pounds.
US federal
- January 1 to December 31
- The usual tax year for individuals.
- April 15
- File your return and pay the tax you owe. First estimated tax payment.
- June 15
- Second estimated tax payment.
- September 15
- Third estimated tax payment.
- October 15
- File your return, if you asked for an extension by the April date. The extension does not give more time to pay.
- January 15
- Fourth estimated tax payment, in the following year.
- Weekends and holidays
- A date on a Saturday, Sunday or legal holiday moves to the next working day.
South Africa
- 1 March to end of February
- The tax year, which SARS calls the year of assessment.
- Each year
- SARS publishes new filing season dates, so check them every year.
- 13 July to 23 October 2026
- The 2026 filing season for non-provisional individuals.
- 13 July 2026 to 22 January 2027
- The 2026 filing season for provisional taxpayers.
- 31 August
- First provisional tax payment, if you are a provisional taxpayer. If that is not a business day, the last business day before it.
- Last business day of February
- Second provisional tax payment.
- Last business day of September
- Optional third provisional tax payment, for individuals.
Free downloads
Editable templates and workbooks for your finance team.
Template
Crypto accounting policy pack
An editable policy with fill-ins and options for recognition, measurement, lot method, fees, valuation, reconciliation and approvals.
Template
Audit evidence pack
An editable checklist of what auditors commonly ask for, from wallet ownership to cut-off, journals and controls.
Spreadsheet
Cost basis workbook
Enter the trades for one token and live formulas work out first in, first out gains. It has room for 200 trades.
Template
Board treasury report
A one-page monthly report covering balances by type, burn, runway, key movements, risks and decisions needed.
CSV
Crypto chart of accounts
A generic starting list of general ledger accounts for crypto activity, to adapt with your accountant. Not set up for any one accounting system.
Spreadsheet
Reconciliation template
Compare balances per chain with balances per ledger for each wallet and token. It flags differences and counts them.
Get every download, free
We'll email you a link to all six files. Confirm your address and they're yours.
Hundreds of trades across many wallets and chains?
These tools work on what you type in. Deciphr reads your wallets across supported chains and prepares the records, with DeFi and judgment items queued for your review.
Terms and disclaimer
Please read this before you use the tools. By using them you agree to it. Last updated 6 November 2026.
Not advice
These tools, templates and pages are general information and calculation aids. Nothing here is financial, investment, tax, accounting, audit, legal or regulatory advice, or a recommendation to buy, sell or hold anything. Using them does not create a professional, advisory, fiduciary or client relationship with Deciphr. Speak to a qualified adviser about your own situation before you act.
Estimates only
Results are estimates based only on what you enter and on simplified assumptions. Most tools say what they cover, and anything outside that is not taken into account. They leave out many facts and rules that may apply to you, and they may be wrong, incomplete or out of date. Tax rates, thresholds, rules and accounting standards change and differ by country and by person. A result is not a tax return, a filing, a valuation, an audit opinion or evidence of anything. Check every result yourself against the original source.
Your responsibility
You are responsible for what you enter, how you use a result, and every tax, accounting, reporting and business decision you make. You must not rely on these tools for any filing, financial statement or transaction.
Third-party data
Live tools show prices and balances from independent public services that Deciphr does not control or check. That data can be delayed, wrong or missing, and a service can stop at any time. When you use a live tool, your browser sends what you look up, such as a token or a public wallet address, straight to those services, and their own terms and privacy policies apply. Deciphr doesn't receive it. Blockchain addresses and activity are public.
The services are currently Binance, DefiLlama, Blockscout, mempool.space, Blockstream, PublicNode, dRPC, 1RPC, Solana Vibe Station and the public nodes run by the Arbitrum, Base, Optimism, BNB Chain, Avalanche, Linea, Scroll, Gnosis and Solana networks. This list may change.
No warranty
The tools are free and provided "as is" and "as available", without any warranty of any kind, including accuracy, completeness, fitness for a purpose, availability or freedom from errors. We may change or remove any tool at any time without notice, and we have no duty to update anything.
No liability
To the maximum extent the law allows, Deciphr, SP Global (Pty) Ltd and their officers, staff and suppliers accept no liability for any loss or damage arising from your use of, or reliance on, these tools, templates or data. This includes tax, penalties, interest, trading or investment losses, lost profits and indirect or consequential loss. Nothing here excludes liability that cannot be excluded by law.
Indemnity
To the extent the law allows, you agree to cover Deciphr and SP Global (Pty) Ltd for claims and costs arising from your misuse of the tools or your breach of these terms.
Digital asset risk
Digital assets are volatile and can lose all their value. Blockchain transactions cannot be reversed. Mention of a token, network, protocol, service or company is not an endorsement.
Your email address
If you ask for the downloads we use your address to send a confirmation link and, only if you tick the box, the newsletter. We delete your address from this signup list when you confirm, or after 7 days if you don't. The page with your files then works for 7 days. A Cloudflare bot check runs when you sign up. If you email us to report a problem, we use your message to look into it. See our privacy notice.
Who we are and which law applies
This site is operated by SP Global (Pty) Ltd. These terms are governed by the laws of the Republic of South Africa. The Deciphr disclaimer and terms of service cover the paid product and any account you hold with us.