Crypto tax exposure modeling

See your estimated crypto tax exposure before you sell.

Model a sale, see the estimated tax exposure, and turn the scenario into a clean record your CPA can review, all before you commit. You provide every figure, typed in or imported from a CSV you confirm.

No wallet connection. No filing. You confirm every number.

Start a SnapshotFree to create · $49 per export

See how it works ↓

Latest Snapshot BreakdownSealed

Estimated tax exposure$12,100.00

Proceeds$85,000.00

Realized Gain$55,000.00

Net After Exposure$42,900.00

How it works

Three steps to a record your CPA can review.

Estimate Exposure

Type the sale details or import a CSV you review and confirm, then see the estimated tax impact before you act. Every assumption is visible and editable.

Lock the Scenario

Preserve the assumptions and result as a sealed snapshot. Locked scenario records cannot be edited after creation, and exports are verification-gated.

Export for Review

Download the Tax Handoff PDF and Tax Handoff CSV. The Proof Archive is included for records support. Your accountant opens the files and never needs access to Sigil One.

Why Sigil One

Not a calculator. Not a connected tracker.

Free calculators

Estimate, then forget

A quick number on screen, with nothing preserved. There is no record to review later or hand to a CPA.

Connected trackers

Automate by requiring access

Convenient, but they ask to connect your wallets and exchanges before they can show you anything.

Sigil One

Preserve a verifiable record

You provide every input. Sigil One estimates the exposure and preserves the scenario as a tamper-evident, verifiable record. No wallet or exchange connection required.

What you get

What the Tax Handoff export includes

The $49 snapshot export delivers the Tax Handoff PDF and CSV, with the Proof Archive included for records support. Holdings exports and CPA Disposal Reports are separate $49 purchases.

Primary

Tax Handoff PDF

Human-readable summary for review, records, or CPA support.

Primary

Tax Handoff CSV

CSV Field Preview

AssetBTC

Quantity0.50

Buy Date2024-01-21

Sell Date2026-05-10

Proceeds$52,000

Cost Basis$31,000

Realized Gain$21,000

Estimated Exposure$6,120

Net After Estimated Exposure$45,880

Illustrative fields. Actual export reflects your scenario inputs.

Spreadsheet-ready disposal data with proceeds, cost basis, realized gain or loss, rates, estimated tax exposure, and net after estimated exposure.

Secondary trust support

Proof Archive included

Sigil One Proof Archive contents preview

Record support for the preserved scenario, including README, manifest, ledger, assumptions, report, and verification context.

Proof Archive contents10 files

README.txtOrientation surface. Handoff hierarchy.Start here

SigilOne_Report.pdfHuman-readable report.

sigil_report.txtPlain-text report.

explanation_narrative.txtWhat the numbers mean, in plain language.

transaction_ledger.csvModeled transaction record.

exposure_summary.csvExposure totals and breakdown.

tax_assumptions.txtAssumptions used in the model.

SigilOne_Tax_Handoff.csvTax handoff data, in spreadsheet form.

SigilOne_Export.csvLegacy compatibility export.

MANIFEST.jsonVerification manifest.Verifiable

Note: SigilOne_Export.csv remains for legacy compatibility.

Integrity

Every exported scenario keeps a verifiable record.

Verified Scenario Snapshots

Each snapshot preserves the assumptions, the modeled result, and the full context of the scenario you ran. You can verify that the locked record still matches the original scenario before export.

Locked scenario records cannot be edited after creation, and exports are verification-gated. A checksum chain links every snapshot, so any mismatch is detectable through verification. Green means intact.

MANIFEST.jsonintegrity verified ✓

Sigil One export status showing Tax Handoff PDF, Tax Handoff CSV, and Proof Archive downloads

By design

You control every assumption.

✓Visible, editable assumptions

✓You confirm imports before they count

✓Tamper-evident, verifiable snapshots

✓Locked records, verification-gated exports

✓No wallet or exchange connection

✓No filing, no form generation

Every number was provided by you, reviewed by you, and confirmed by you. Nothing is imported silently, and every assumption is visible before export.

Prefer to start from records? Import a CSV. It is parsed in your browser and never stored, and every row stays staged source evidence until you review and confirm it.

Sigil One is not tax filing software. It does not generate forms, connect to exchanges, or claim to know what you owe. It estimates the exposure, preserves the scenario, and gives your CPA something concrete to review.

Sigil One staged CSV imports: in-browser parsing, source-evidence rows, and confirmation preview

Pricing

Snapshots are free. You only pay when you export.

Founder's Launch Price

$49

per export

Create and review snapshots. Always free.

Snapshot export ($49): Tax Handoff PDF and CSV, with the Proof Archive included.

Holdings export ($49): what you still own, as a unified portfolio PDF. Separate purchase; re-exportable for 72 hours.

CPA Disposal Report ($49): what you sold, with proceeds and available basis. Separate purchase; re-exportable for 72 hours.

Verify your record any time. No export required.

No subscription. Pay only when you export.

Start a Snapshot

Holdings and disposals

What you still own, and what you sold.

Track your wider portfolio alongside the sale scenario you modeled, so the full picture is available when you or your CPA need it.

When you have actually sold, Record Disposal saves it as a durable disposal record for CPA review, without changing the original holding. Partial-lot sales are not supported yet.

Common questions

What Sigil One does, and does not do.

Is this tax filing software?

No. Sigil One estimates exposure. It does not file taxes, generate official forms, or make claims about what you owe.

Do I need to connect a wallet or exchange?

No. All input comes from you, typed directly or imported from CSV files you review and confirm. Sigil One never connects to wallets, exchanges, or any external financial system.

What does it cost?

Creating and reviewing snapshots is free. You only pay when you export. Each export purchase is $49. The snapshot export delivers the Tax Handoff PDF and Tax Handoff CSV, with the Proof Archive included as secondary trust support. The holdings export gives you a unified PDF of your portfolio holdings. The CPA Disposal Report is a disposals-only PDF of what you sold, for CPA review. These are separate purchases. Holdings and CPA report purchases include re-exports of that report for 72 hours.

Can my CPA use the export without the app?

Yes. The snapshot export bundle, the Holdings PDF, and the CPA Disposal Report are each self-contained. Your accountant can review the files without ever accessing Sigil One.

Model the sale before you make it.

Estimate the exposure, preserve the record, and export a clean handoff for your CPA.

Start a Snapshot

See how it works ↑