diff --git a/src/subdomains/core/accounting/services/consumers/__tests__/bank-tx.consumer.spec.ts b/src/subdomains/core/accounting/services/consumers/__tests__/bank-tx.consumer.spec.ts
index 389562e266..b60f683abc 100644
--- a/src/subdomains/core/accounting/services/consumers/__tests__/bank-tx.consumer.spec.ts
+++ b/src/subdomains/core/accounting/services/consumers/__tests__/bank-tx.consumer.spec.ts
@@ -304,6 +304,28 @@ describe('BankTxConsumer', () => {
     expect(cents(legs)).toBe(0);
   });
 
+  // prod reality: a return bank_tx is linked from buy_crypto.chargebackBankTx — its buyCrypto (inbound-payment
+  // inverse) is null. The owed anchor must come from buyCryptoChargeback (bank_tx 206858/206864 regression).
+  it('books BUY_CRYPTO_RETURN linked only via buyCryptoChargeback (buyCrypto is null on returns)', async () => {
+    const buyCryptoChargeback = { id: 128422, amountInChf: 9226.11, totalFeeAmountChf: 0 } as any;
+    mockBatch([
+      bankTx({
+        type: BankTxType.BUY_CRYPTO_RETURN,
+        creditDebitIndicator: BankTxIndicator.DEBIT,
+        accountIban: 'CHF-IBAN',
+        amount: 9226.11,
+        buyCrypto: undefined,
+        buyCryptoChargeback,
+      }),
+    ]);
+    await consumer.process();
+
+    const legs = booked[0].legs;
+    const owed = legs.find((l) => l.account.name === 'LIABILITY/buyCrypto-owed');
+    expect(owed.amountChf).toBe(9226.11); // completion CHF from the chargeback relation, no throw
+    expect(cents(legs)).toBe(0);
+  });
+
   it('books KRAKEN DBIT as Dr TRANSIT/bank↔Kraken / Cr ASSET/bank (CHF, route nets to 0)', async () => {
     mockBatch([
       bankTx({
diff --git a/src/subdomains/core/accounting/services/consumers/bank-tx.consumer.ts b/src/subdomains/core/accounting/services/consumers/bank-tx.consumer.ts
index 7a39ed1602..b1842e0318 100644
--- a/src/subdomains/core/accounting/services/consumers/bank-tx.consumer.ts
+++ b/src/subdomains/core/accounting/services/consumers/bank-tx.consumer.ts
@@ -88,7 +88,7 @@ export class BankTxConsumer {
       SOURCE_TYPE,
       afterForward,
       this.bankTxRepo,
-      { buyCrypto: true },
+      { buyCrypto: true, buyCryptoChargeback: true },
       async (tx: BankTx) => {
         const t = tx.bookingDate ?? tx.created;
         await this.reconcileBooking(
@@ -104,7 +104,7 @@ export class BankTxConsumer {
     // DBIT only after 5 min (analog assignTransactions); settlement = bookingDate ?? created (§4.2)
     const batch = await this.bankTxRepo.find({
       where: { id: MoreThan(watermark.lastProcessedId), created: LessThan(Util.minutesBefore(5)) },
-      relations: { buyCrypto: true },
+      relations: { buyCrypto: true, buyCryptoChargeback: true },
       order: { id: 'ASC' },
       take: Config.ledger.backfillBatchSize,
     });
@@ -283,12 +283,15 @@ export class BankTxConsumer {
   // the CHF the buyCrypto-owed was opened with: §4.6 completion (amountInChf − totalFeeAmountChf), or — for a
   // cutover-straddling buy_crypto whose owed was opened by the cutover (§6.1 per-row marker) — the opening CHF.
   private async buyCryptoOwedChf(tx: BankTx): Promise<number> {
-    const openingChf = await this.cutoverOwedOpeningChf(tx.buyCrypto?.id);
+    // a return bank_tx is linked from buy_crypto.chargebackBankTx — tx.buyCrypto is the inbound-payment
+    // inverse and is null on returns
+    const buyCrypto = tx.buyCryptoChargeback ?? tx.buyCrypto;
+    const openingChf = await this.cutoverOwedOpeningChf(buyCrypto?.id);
     if (openingChf != null) return openingChf; // cutover-straddling: debit the exact opening CHF anchor
 
-    const amountInChf = tx.buyCrypto?.amountInChf;
+    const amountInChf = buyCrypto?.amountInChf;
     if (amountInChf == null) throw new Error(`bank_tx ${tx.id} BUY_CRYPTO_RETURN without buyCrypto.amountInChf`);
-    return Util.round(amountInChf - (tx.buyCrypto?.totalFeeAmountChf ?? 0), 2); // completion CHF (additive null-strategy)
+    return Util.round(amountInChf - (buyCrypto?.totalFeeAmountChf ?? 0), 2); // completion CHF (additive null-strategy)
   }
 
   // looks up the cutover per-row owed-opening leg CHF (§6.1 marker `${snapshotLogId}:buy_crypto-owed:${id}`); the