The IRS thinks you made money you never made.
New 1099-DA forms report what you sold — often not what you paid. ClearBasis rebuilds your missing cost basis from every exchange and wallet, and produces corrected forms with every number traced to evidence — ready for the only signature that matters: yours. Fixed price. No hourly meter. No meetings.
Free scan shows what your 1099-DA likely overstates — before you pay anything. Rebuilds from $99.
| 0x8f2a…c41d | basis unknown | $12,000.00 |
| Kraken row 2,114 | gap detected | $3,410.22 |
| FTX (dead) import | rebuilding… | — |
| 0x8f2a…c41d | ✓ matched, verifiable | $4,917.03 |
| Kraken row 2,114 | ✓ basis rebuilt | $1,204.90 |
Why your tax software says “unknown” 2,400 times.
Blank basis
Exchanges can’t see what you paid elsewhere — so the form shows zero, and the IRS computer treats the whole sale as profit.
Fixable. The records exist — on-chain and in your files.
Dead platforms
FTX, BitMart, that DEX from 2021 — the records didn’t die with them. We rebuild from chain data and whatever exports you still have.
This is the segment nobody else serves well. The Exchange Graveyard →
New rules
Wallet-by-wallet basis is mandatory now (Rev. Proc. 2024-28). Most filers never migrated — through no fault of their own.
We track lots the way the rule requires.
Three steps. One fixed price. You stay in control.
Connect & upload
Read-only exchange files, CSVs, wallet addresses. We can never move funds — by design.
The engine rebuilds
Every acquisition reconciled to every disposal. Anything ambiguous becomes a plain-language decision card — with the tax consequence of each choice shown side-by-side.
Review, sign, done
Corrected Form 8949, basis ledger, and workpapers — you walk through every position, then sign. Most engagements: same day.
Every platform in detail — exports, gaps, what the reporting misses →
Save a free scan and we email you the moment your exchange or chain connects — that’s the honest version of a logo wall.
Your scan becomes your account — no password, ever.
Scanning needs no account at all. When you want to keep what it found, one email saves it — that email is your account. We never ask you to invent a password: you get a sign-in link instead, and everything lands in your dashboard.
1 · Save your scan
Email only. Your scan stops expiring, your price band freezes at today's founding price, and your Basis Passport export is yours free, forever.
2 · Open your dashboard
Your true gain against what a blank-basis form would claim, every source with its gaps, your country's deadlines counted down, and your documents — locked ones shown as locked, at the price you locked.
3 · Add sources any time
Each new exchange or wallet merges into one ledger, and transfers between them are matched instead of taxed twice. Looking stays free — you pay only for the documents.
What it costs. Exactly.
Basis Rebuild
- Corrected Form 8949 (PDF + CSV)
- Evidence-linked workpaper pack
- Wallet-by-wallet basis ledger
- Free scan first — pay only if it’s worth fixing
CP2000 Response Kit
- Notice decoder — live now, free
- Corrected figures + response letter in your voice
- Evidence exhibits, ready to mail
- Deadline tracking to the day
Never Again
- Ongoing wallet-by-wallet tracking
- Next season’s 8949 auto-generated
- New-notice monitoring guides
- Cancel anytime
Proof, not promises.
No fake logos. Here is a redacted page from a real workpaper pack — every figure cites its evidence. Our methodology memos are public, versioned, and reviewed by an independent EA before launch.
| Disposal | Basis | Evidence |
|---|---|---|
| 4.19 ETH · 05/15/2025 | $5,965.97 | 0x3c9d…a2, CB row 88, price src 2021-03-01 |
| 1 BTC · 06/01/2025 | $30,000.00 | CB stmt 2021-01, xfer 0x77…e1 |
Built like we’ll be audited — because your file might be.
Practitioner? Put our engine under your letterhead.
ClearBasis Workbench — white-label workpapers, firm workspace, $149/mo + $25/engagement. Self-serve, no sales calls.
Free tools — no account, no upload, just answers.
Built from the same engine and the same verified sources as the paid product. Use them, share them, link them.
IRS letter decoder →
CP2000, 6174-A, CP504… what the IRS actually thinks, what triggered it, and your real deadline counted down to the day — plus what silence costs you.
Who reports on you →
Pick your country, see exactly what your exchanges send to your tax authority, starting when, under which law — 1099-DA, DAC8, CARF — with citations.
The Exchange Graveyard →
FTX, Celsius, Cryptopia, Mt. Gox… what records survive each dead platform, how to recover them, and what's rebuildable from the chain.
Basis Passport →
Your complete evidence-linked basis history as a signed, portable file — free from any saved scan, spec published. Your basis is yours; leave anytime.
The 24% withholding check →
From 1 January 2027 a broker withholds 24% of what you sell — the payment, not the profit — unless it holds a certified W-9 for you. See the exposure, and the ten-minute fix.
Wash-sale check →
The 30-day rule that traps stock investors does not reach crypto — §1091 covers securities, and the IRS treats crypto as property. See what that is worth on a pair of dates, and the doctrine that does still apply.
The September 15 check →
Sold crypto this year? Work out whether the IRS expects an estimated-tax payment before the 15 September deadline — the safe harbour is the lesser of two tests, and most people who fear it are already covered.
Is tokenized gold a collectible? →
PAXG and XAUT may carry the 28% collectibles ceiling instead of the long-term rate — nobody has ruled, and no crypto tool surfaces it. What each position rests on, and the honest part: for most brackets it changes nothing at all.
Korea's Basis Day countdown →
At midnight on 1 January 2027 Korea fixes your crypto cost at the greater of what you paid and the market price. That floor carries you if you are up — and costs you the difference if you are down and cannot prove it. Work out which you are, per asset.
Every IRS notice, in plain English →
Twenty-one notices and letters: what each one means, the deadline it really carries, the rights that expire with it, and the mistake people make. Every claim cited — and where the IRS publishes no day count, we say so instead of inventing thirty days.
ETF staking decoder →
Your spot ETH or SOL fund started staking. As a grantor trust it hands you ordinary income you may never have been paid, a coin disposal every single day to cover the sponsor fee, and no deduction for that fee. Work all three out from the sponsor's own file.
Is this IRS letter real? →
Six questions that identify an impersonation, the tells from the IRS's own scam alerts, and the one number to call. We never tell you a letter is genuine — nobody honestly can — only when it certainly is not.
Relocation reality check →
Fourteen jurisdictions, side by side: who taxes a swap, who exempts a coin held a year, and whose exit tax reaches coins rather than shares. Every rule cited, computed in your browser, no exchange rate invented.
Unfiled years, caught up →
Two, five, seven years never reported? The late-filing penalty is a percentage of the tax you owed — for a losing year that percentage is a percentage of nothing. Work out what catching up actually costs before you assume the worst.
Scam loss check →
Stolen in an investment scam? Walk the five conditions for a deductible theft loss — in your browser, every rule cited, and we never sell "recovery".
Tx explainer →
Paste a transaction hash and get the plain-language story: what actually happened, and which legs of it are taxable where you live.
Questions everyone asks
Is this tax advice?
No. ClearBasis is tax software — it prepares the documentation; the decisions and the signature are yours, the way self-prepared filing has always worked. We rebuild your records and prepare documentation; you review every position and sign your own return. When your situation genuinely needs a professional, we say so plainly and show you our independent CPA directory.
What if my exchange is dead?
That’s our specialty. Blockchain records outlive companies. We rebuild from on-chain history plus any exports you kept — FTX, Cryptopia, BlockFi, the DEX you forgot the name of.
What does “fixed price” exclude?
Nothing hidden. Price is set by transaction count, verified during the free scan — before you pay. If your count band changes after full ingestion, we tell you explicitly and you approve before anything is charged.
How fast for an IRS notice?
The decoder reads your letter in about 90 seconds, free, and opens shortly. The full response kit is typically ready the same day your data is in — your 30-day clock is tracked to the day, visibly.
Do I need an account?
Not to scan — the scan and every free tool run with no account at all. An account only appears when you want to keep a result: saving a scan with your email creates it, freezes your founding price, and opens your dashboard, where your sources, gaps, deadlines and documents live. There is no password to invent or lose — you sign in with a link we email you.
Do you file my return?
No. We produce the corrected forms and the evidence behind them. You (or your preparer) file. Your return, your signature — that’s the point.
What can I use without paying anything?
The free scan itself, plus four standalone tools: the IRS letter decoder (what your notice means and your real deadline), who reports on you (what exchanges send your tax authority, country by country), the Exchange Graveyard (recovering records from dead platforms), and the Basis Passport export from any saved scan — your basis history as a signed portable file. No account needed for any of them.
What about DeFi and NFTs?
Swaps, liquidity add/remove, staking rewards, lending, bridging, NFT buys/sells are in scope. Exotic derivatives are flagged honestly as out of scope, with raw evidence exported so any professional can pick it up.