The payment arrives in minutes. The booking has to hold for years.
Between a wallet and proper financial accounting sits a human with a spreadsheet. Every month.
| No bank statement | A wallet produces transaction hashes, not journal entries. No ERP reads a hash, and no bank sends a statement for this payment. |
| Valuation by hand | Every inflow must be valued in euro at the moment it arrives, with a documented rate source. Today that means: google the rate, open Excel, hope. |
| Two parallel ledgers | The crypto spreadsheet here, the financial books there. Someone rebuilds the bridge every month, and at year-end nobody trusts it. |
| Audit questions | Where did this rate come from? Who recorded this entry, and when? Without a complete audit trail, every audit becomes a very long week. |
Three steps, never touching your money
1. Connect an address. You provide a public wallet address or a read-only exchange key. No signing rights, no private keys, no approvals.
2. Value and book. Every transaction is valued in euro at a documented market rate, mapped to the right account, and booked with correct VAT, in SKR03 or SKR04. Moves between your own wallets are recognised and never booked as revenue; deposits into lending contracts go to review with the tax treatment attached. Deterministic rules with cited sources, never a black box.
3. Export to DATEV. Your tax firm receives an EXTF batch exactly as they know it, plus a reconciliation report and, behind every entry, its audit trail: hash, rate source, rule, approval.
Every rule sits with its journal entry and legal basis in the rulebook; the steps in detail are in Booking a USDC payment in DATEV.
What is recognised, and what stands behind it
Four cases that regularly go wrong in hand-kept spreadsheets. Behind each one is the sourced answer.
| Which exchange rate applies when valuing crypto-assets in the books? | Every inflow is valued at the market rate at the time of the transaction from a named source; the method per month is in the valuation log. |
| Is a transfer between one's own wallets a disposal? | Moves between your own wallets are recognised and never booked as revenue; cross-chain bridge pairs are proposed by the engine and confirmed by a person. |
| When is income from crypto lending recognised for business assets? | Deposits into and withdrawals from lending contracts (Aave V3, Compound V3) go to review with their tax treatment attached and cannot be approved as revenue. |
| How are staking rewards recognised for business assets? | Staking income carries the margin number of the BMF letter and the open questions for the tax firm directly on the review item. |
Four documents for the tax firm
| EXTF batch | A batch in the format DATEV Kanzlei-Rechnungswesen imports. |
| Reconciliation report | Wallet balance against book balance, every month. Differences are shown, never hidden. |
| Audit trail per entry | Every entry carries its hash, rate source, rule version and approval. The report shows, month by month, which rate method was applied and names every entry that departed from it. Chained and traceable, entry by entry. |
| Recapitulative statement | For supplies to businesses elsewhere in the EU: the customer's VAT ID and amount for the quarter already aggregated, ready for the tax firm to file (section 18a UStG). |
How the e-invoice behind a payment is bound into the same audit trail is described on the evidence chain page. What a crypto mandate costs a tax firm without all this is in the crypto client calculator.
A few lines are enough: which wallets or exchanges, roughly how many payments a month, which tax firm and which chart of accounts. We reply personally.
Legal basis: BMF letter of 06.03.2025 (IV C 1 - S 2256/00042/064/043) on the income tax treatment of crypto-assets, in particular margin numbers 43 and 91 on valuation; sections 12(1), 3a(2), 13b and 18a UStG; the GoBD (BMF letter of 28.11.2019, last amended 14.07.2025) and sections 146 and 147 AO. This page describes a product, not legal or tax advice; account choice and classification in the individual case are a question for your tax firm.