diff --git a/public/js/modals/refund-modal.js b/public/js/modals/refund-modal.js
new file mode 100644
index 0000000..fd58e49
--- /dev/null
+++ b/public/js/modals/refund-modal.js
@@ -0,0 +1,282 @@
+/**
+ * refund-modal.js — Record Vendor Refund
+ *
+ * Erzeugt einen QBO Deposit gegen die ursprüngliche Expense-Kategorie.
+ * Für den Fall: Geld kam tatsächlich zurück aufs Bank-/Kreditkartenkonto.
+ */
+
+import '../utils/api.js';
+
+let modalEl = null;
+let onSavedCb = null;
+
+let vendors = [];
+let expenseAccounts = [];
+let paymentAccounts = [];
+
+let selectedVendorId = null;
+let selectedVendorName = '';
+let isSaving = false;
+
+function todayISO() { return new Date().toISOString().split('T')[0]; }
+
+function escapeHtml(s) {
+    if (s == null) return '';
+    return String(s)
+        .replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
+        .replace(/"/g, '&quot;').replace(/'/g, '&#39;');
+}
+function escapeAttr(s) {
+    return String(s || '')
+        .replace(/&/g, '&amp;').replace(/"/g, '&quot;')
+        .replace(/</g, '&lt;').replace(/>/g, '&gt;');
+}
+
+export async function openRefundModal({ onSaved } = {}) {
+    onSavedCb = onSaved || null;
+    selectedVendorId = null;
+    selectedVendorName = '';
+    isSaving = false;
+
+    try {
+        [vendors, expenseAccounts, paymentAccounts] = await Promise.all([
+            window.API.accounting.getVendors('', 1000),
+            window.API.accounting.getExpenseAccounts(),
+            window.API.accounting.getPaymentAccounts()
+        ]);
+        for (const [name, data] of [['vendors', vendors], ['expenseAccounts', expenseAccounts], ['paymentAccounts', paymentAccounts]]) {
+            if (data && data.error) {
+                alert(`Failed to load ${name}: ${data.error}\n\nTry "Sync from QBO" first.`);
+                return;
+            }
+        }
+    } catch (err) {
+        alert('Failed to load refund modal data: ' + err.message);
+        return;
+    }
+
+    renderModal();
+}
+
+function closeModal() {
+    if (modalEl) { modalEl.remove(); modalEl = null; }
+}
+
+function renderModal() {
+    closeModal();
+
+    const html = `
+        <div id="refund-modal" class="modal fixed inset-0 bg-gray-600 bg-opacity-50 overflow-y-auto h-full w-full flex items-start justify-center z-50">
+            <div class="relative mx-auto p-6 border w-full max-w-2xl shadow-lg rounded-lg bg-white my-8">
+                <div class="flex justify-between items-center mb-5">
+                    <h3 class="text-2xl font-bold text-gray-900">↩️ Record Refund</h3>
+                    <button onclick="window.refundModal.close()" class="text-gray-400 hover:text-gray-600">
+                        <svg class="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"/>
+                        </svg>
+                    </button>
+                </div>
+
+                <p class="text-sm text-gray-500 mb-4">
+                    Money refunded by a vendor that was returned to your bank or credit card.
+                    Booked against the original expense category.
+                </p>
+
+                <div class="grid grid-cols-2 gap-4 mb-4">
+                    <div class="relative">
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Vendor *</label>
+                        <input type="text" id="ref-vendor-search" autocomplete="off"
+                               oninput="window.refundModal.onVendorInput()"
+                               onfocus="window.refundModal.onVendorInput()"
+                               placeholder="Type to search…"
+                               class="w-full px-3 py-2 border border-gray-300 rounded-md">
+                        <input type="hidden" id="ref-vendor-id">
+                        <div id="ref-vendor-dropdown"
+                             class="hidden absolute z-50 w-full mt-1 bg-white border border-gray-300 rounded-md shadow-lg max-h-72 overflow-auto"></div>
+                    </div>
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Date *</label>
+                        <input type="date" id="ref-date" value="${todayISO()}"
+                               class="w-full px-3 py-2 border border-gray-300 rounded-md">
+                    </div>
+                </div>
+
+                <div class="grid grid-cols-2 gap-4 mb-4">
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Deposit To *</label>
+                        <select id="ref-deposit-account" class="w-full px-3 py-2 border border-gray-300 rounded-md">
+                            <option value="">— Select account —</option>
+                            ${paymentAccounts.map(a => `
+                                <option value="${a.id}">${escapeHtml(a.name)} (${escapeHtml(a.accountType)})</option>`).join('')}
+                        </select>
+                        <p class="text-xs text-gray-400 mt-1">Where the money came back to.</p>
+                    </div>
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Original Category *</label>
+                        <select id="ref-category" class="w-full px-3 py-2 border border-gray-300 rounded-md">
+                            <option value="">— Select category —</option>
+                            ${expenseAccounts.map(a => `
+                                <option value="${a.id}" title="${escapeAttr(a.fullyQualifiedName || a.name)}">
+                                    ${escapeHtml(a.fullyQualifiedName || a.name)}
+                                </option>`).join('')}
+                        </select>
+                        <p class="text-xs text-gray-400 mt-1">Same category as the original expense.</p>
+                    </div>
+                </div>
+
+                <div class="grid grid-cols-2 gap-4 mb-4">
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Refund Amount *</label>
+                        <input type="number" step="0.01" min="0" id="ref-amount"
+                               class="w-full px-3 py-2 border border-gray-300 rounded-md text-right"
+                               placeholder="0.00">
+                    </div>
+                    <div>
+                        <label class="block text-sm font-medium text-gray-700 mb-1">Ref No.</label>
+                        <input type="text" id="ref-ref-no" maxlength="21"
+                               class="w-full px-3 py-2 border border-gray-300 rounded-md"
+                               placeholder="e.g. eBay refund ID">
+                    </div>
+                </div>
+
+                <div class="mb-4">
+                    <label class="block text-sm font-medium text-gray-700 mb-1">Memo</label>
+                    <textarea id="ref-memo" rows="2"
+                              class="w-full px-3 py-2 border border-gray-300 rounded-md"
+                              placeholder="Internal note (visible in QBO)"></textarea>
+                </div>
+
+                <div id="ref-error" class="hidden mb-4 p-3 bg-red-50 border border-red-200 rounded text-sm text-red-700"></div>
+
+                <div class="flex justify-end gap-3">
+                    <button type="button" onclick="window.refundModal.close()"
+                            class="px-5 py-2 bg-gray-200 hover:bg-gray-300 text-gray-700 rounded-md">Cancel</button>
+                    <button type="button" id="ref-save-btn" onclick="window.refundModal.save()"
+                            class="px-5 py-2 bg-green-600 hover:bg-green-700 text-white rounded-md font-medium">
+                        Record Refund
+                    </button>
+                </div>
+            </div>
+        </div>`;
+
+    document.body.insertAdjacentHTML('beforeend', html);
+    modalEl = document.getElementById('refund-modal');
+}
+
+function onVendorInput() {
+    const inputEl = document.getElementById('ref-vendor-search');
+    const dropdownEl = document.getElementById('ref-vendor-dropdown');
+    const q = (inputEl.value || '').trim().toLowerCase();
+
+    if (selectedVendorName && inputEl.value !== selectedVendorName) {
+        selectedVendorId = null;
+        selectedVendorName = '';
+        document.getElementById('ref-vendor-id').value = '';
+    }
+
+    const filtered = q
+        ? vendors.filter(v => v.displayName.toLowerCase().includes(q)).slice(0, 50)
+        : vendors.slice(0, 50);
+
+    let html = '';
+    if (filtered.length === 0) {
+        html = `<div class="px-3 py-2 text-gray-500 text-sm">No vendor found.</div>`;
+    } else {
+        html = filtered.map(v => `
+            <div class="px-3 py-2 cursor-pointer hover:bg-gray-100 text-sm"
+                 onclick="window.refundModal.selectVendor('${v.id}', '${escapeAttr(v.displayName)}')">
+                <div class="font-medium text-gray-900">${escapeHtml(v.displayName)}</div>
+                ${v.email ? `<div class="text-xs text-gray-500">${escapeHtml(v.email)}</div>` : ''}
+            </div>`).join('');
+    }
+
+    dropdownEl.innerHTML = html;
+    dropdownEl.classList.remove('hidden');
+
+    if (!dropdownEl._outsideHandlerInstalled) {
+        dropdownEl._outsideHandlerInstalled = true;
+        document.addEventListener('click', (e) => {
+            if (!dropdownEl.contains(e.target) && e.target !== inputEl) {
+                dropdownEl.classList.add('hidden');
+            }
+        });
+    }
+}
+
+function selectVendor(id, name) {
+    selectedVendorId = id;
+    selectedVendorName = name;
+    document.getElementById('ref-vendor-search').value = name;
+    document.getElementById('ref-vendor-id').value = id;
+    document.getElementById('ref-vendor-dropdown').classList.add('hidden');
+}
+
+async function save() {
+    if (isSaving) return;
+    hideError();
+
+    if (!selectedVendorId) return showError('Please select a vendor.');
+
+    const depositAccountId = document.getElementById('ref-deposit-account').value;
+    if (!depositAccountId) return showError('Please select the deposit account.');
+
+    const categoryAccountId = document.getElementById('ref-category').value;
+    if (!categoryAccountId) return showError('Please select the original expense category.');
+
+    const txnDate = document.getElementById('ref-date').value;
+    if (!txnDate) return showError('Please enter a date.');
+
+    const amount = parseFloat(document.getElementById('ref-amount').value);
+    if (!isFinite(amount) || amount <= 0) {
+        return showError('Please enter a positive refund amount.');
+    }
+
+    const payload = {
+        vendorId: selectedVendorId,
+        depositAccountId,
+        categoryAccountId,
+        txnDate,
+        amount,
+        refNo: document.getElementById('ref-ref-no').value.trim() || null,
+        memo: document.getElementById('ref-memo').value.trim() || null
+    };
+
+    isSaving = true;
+    const btn = document.getElementById('ref-save-btn');
+    btn.disabled = true;
+    btn.textContent = 'Saving…';
+
+    try {
+        const result = await window.API.accounting.createRefund(payload);
+        if (result.error) {
+            showError(result.error);
+            return;
+        }
+        if (typeof onSavedCb === 'function') {
+            try { onSavedCb(result); } catch (e) { console.warn('onSaved cb threw:', e); }
+        }
+        closeModal();
+    } catch (err) {
+        showError(err.message || 'Save failed');
+    } finally {
+        isSaving = false;
+        if (btn) { btn.disabled = false; btn.textContent = 'Record Refund'; }
+    }
+}
+
+function showError(msg) {
+    const el = document.getElementById('ref-error');
+    if (el) { el.textContent = msg; el.classList.remove('hidden'); }
+}
+function hideError() {
+    const el = document.getElementById('ref-error');
+    if (el) el.classList.add('hidden');
+}
+
+window.refundModal = {
+    open: openRefundModal,
+    close: closeModal,
+    onVendorInput,
+    selectVendor,
+    save
+};
\ No newline at end of file
diff --git a/public/js/utils/api.js b/public/js/utils/api.js
index 0eab879..311c479 100644
--- a/public/js/utils/api.js
+++ b/public/js/utils/api.js
@@ -169,6 +169,12 @@ const API = {
             body: JSON.stringify(data)
         }).then(r => r.json()),
         
+        createRefund: (data) => fetch('/api/accounting/refunds', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify(data)
+        }).then(r => r.json()),        
+        
         updateExpense: (id, data) => fetch(`/api/accounting/expenses/${id}`, {
             method: 'PUT',
             headers: { 'Content-Type': 'application/json' },
diff --git a/public/js/views/accounting-view.js b/public/js/views/accounting-view.js
index 2684745..db19678 100644
--- a/public/js/views/accounting-view.js
+++ b/public/js/views/accounting-view.js
@@ -8,6 +8,7 @@
 import '../utils/api.js';
 import { formatDate } from '../utils/helpers.js';
 import { openExpenseModal } from '../modals/expense-modal.js';
+import { openRefundModal } from '../modals/refund-modal.js';
 
 // ────────────────────────────────────────────────────────────────────
 // State (modul-lokal)
@@ -568,7 +569,11 @@ export function injectExpensesSection() {
                             class="px-3 py-1.5 bg-blue-600 text-white rounded-md text-sm font-medium hover:bg-blue-700">
                         Load
                     </button>
-                    <div class="ml-auto">
+                    <div class="ml-auto flex gap-2">
+                        <button onclick="window.accountingView.openNewRefund()"
+                                class="px-4 py-1.5 bg-amber-600 text-white rounded-md text-sm font-semibold hover:bg-amber-700">
+                            ↩️ Record Refund
+                        </button>
                         <button onclick="window.accountingView.openNewExpense()"
                                 class="px-4 py-1.5 bg-green-600 text-white rounded-md text-sm font-semibold hover:bg-green-700">
                             + New Expense
@@ -703,17 +708,26 @@ export async function editExpense(expenseJson) {
         onSaved: () => loadExpenses()
     });
 }
+export async function openNewRefund() {
+    await openRefundModal({
+        onSaved: (result) => {
+            alert(`✅ Refund recorded: ${fmtMoney(result.totalAmt)} from ${result.vendorName}\nDeposit #${result.id} — booked to ${result.categoryName}`);
+            loadExpenses();
+        }
+    });
+}
 window.accountingView = {
     renderAccountingView,
     refreshAll,
     manualSync,
     loadAccountsOverview,
     loadRegister,
-    selectRegisterAccount,
     loadProfitLoss,
     loadBalanceSheet,
     loadExpenses,
     openNewExpense,
+    openNewRefund,
     editExpense,
+    selectRegisterAccount,
     toggleSection
 };
\ No newline at end of file
diff --git a/src/routes/accounting.js b/src/routes/accounting.js
index 291ab7d..1c318e7 100644
--- a/src/routes/accounting.js
+++ b/src/routes/accounting.js
@@ -277,6 +277,15 @@ router.put('/expenses/:id', express.json(), async (req, res) => {
         res.json(result);
     } catch (err) { handleQboError(err, res, 'expense-update'); }
 });
+// ─── POST /api/accounting/refunds ───────────────────────────────────
+// Erstellt einen QBO Deposit für einen Vendor-Refund (Geld kam zurück).
+// Body: { vendorId, depositAccountId, categoryAccountId, txnDate, amount, refNo?, memo? }
+router.post('/refunds', express.json(), async (req, res) => {
+    try {
+        const result = await accountingService.createRefund(req.body || {});
+        res.json(result);
+    } catch (err) { handleQboError(err, res, 'refund-create'); }
+});
 router.get('/attachments/limits', (req, res) => {
     res.json({
         maxBytes: ATTACHMENT_MAX_BYTES,
diff --git a/src/services/accounting-service.js b/src/services/accounting-service.js
index 7a7f469..51ed45b 100644
--- a/src/services/accounting-service.js
+++ b/src/services/accounting-service.js
@@ -898,6 +898,144 @@ async function createExpense(data) {
     };
 }
 
+
+/**
+ * Erstellt einen QBO Deposit für einen Vendor-Refund (Geld kam zurück aufs Konto).
+ *
+ * Buchhalterisch: Der Refund wird gegen die ursprüngliche Expense-Kategorie
+ * gebucht, wodurch sich der Aufwand in dieser Kategorie reduziert.
+ *
+ * @param {Object} data
+ * @param {string} data.vendorId           - Pflicht (von wem kam der Refund)
+ * @param {string} data.depositAccountId   - Pflicht (Bank/CC-Konto, wo das Geld ankam)
+ * @param {string} data.txnDate            - Pflicht, YYYY-MM-DD
+ * @param {string} data.categoryAccountId  - Pflicht (ursprüngliche Expense-Kategorie)
+ * @param {number} data.amount             - Pflicht, positiver Betrag
+ * @param {string} [data.refNo]
+ * @param {string} [data.memo]
+ * @returns {{ id, txnDate, totalAmt, vendorName, depositAccountName, categoryName }}
+ */
+async function createRefund(data) {
+    if (!data.vendorId)          throw badRequest('vendorId is required');
+    if (!data.depositAccountId)  throw badRequest('depositAccountId is required');
+    if (!data.categoryAccountId) throw badRequest('categoryAccountId is required');
+    if (!data.txnDate)           throw badRequest('txnDate is required');
+
+    const amount = Number(data.amount);
+    if (!isFinite(amount) || amount <= 0) {
+        throw badRequest('amount must be a positive number (the refund value)');
+    }
+
+    // ── Deposit-Konto aus Cache ──
+    const depRow = await pool.query(
+        `SELECT qbo_id, name, account_type FROM qbo_account_cache WHERE qbo_id = $1`,
+        [data.depositAccountId]
+    );
+    if (depRow.rows.length === 0) {
+        throw badRequest(`Deposit account ${data.depositAccountId} not in cache. Run sync first.`);
+    }
+    const depositAcct = depRow.rows[0];
+
+    // ── Kategorie-Konto aus Cache ──
+    const catRow = await pool.query(
+        `SELECT qbo_id, name FROM qbo_account_cache WHERE qbo_id = $1`,
+        [data.categoryAccountId]
+    );
+    if (catRow.rows.length === 0) {
+        throw badRequest(`Category account ${data.categoryAccountId} not in cache. Run sync first.`);
+    }
+    const categoryAcct = catRow.rows[0];
+
+    // ── Vendor-Name aus Cache ──
+    const vendorRow = await pool.query(
+        `SELECT display_name FROM qbo_vendor_cache WHERE qbo_id = $1`,
+        [data.vendorId]
+    );
+    const vendorName = vendorRow.rows[0]?.display_name || data.vendorId;
+
+    // ── QBO Deposit Payload ──
+    const payload = {
+        DepositToAccountRef: { value: depositAcct.qbo_id, name: depositAcct.name },
+        TxnDate: data.txnDate,
+        Line: [{
+            DetailType: 'DepositLineDetail',
+            Amount: amount,
+            Description: data.memo || `Refund from ${vendorName}`,
+            DepositLineDetail: {
+                AccountRef: { value: categoryAcct.qbo_id, name: categoryAcct.name },
+                Entity: { value: data.vendorId, type: 'Vendor' }
+            }
+        }]
+    };
+
+    if (data.refNo) payload.Line[0].DepositLineDetail.CheckNum = String(data.refNo).slice(0, 21);
+    if (data.memo)  payload.PrivateNote = String(data.memo);
+
+    const { companyId, baseUrl } = getClientInfo();
+    const url = withMinorVersion(`${baseUrl}/v3/company/${companyId}/deposit`);
+
+    const requestSummary = `REFUND | ${vendorName} → ${depositAcct.name} | ${categoryAcct.name} | ${data.txnDate} | $${amount.toFixed(2)}`;
+
+    let qboResponse;
+    try {
+        const response = await makeQboApiCall({
+            url,
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify(payload)
+        });
+        qboResponse = getJson(response);
+    } catch (err) {
+        await writeAuditLog({
+            action: 'refund.create',
+            entityType: 'Deposit',
+            status: 'error',
+            requestExcerpt: requestSummary,
+            responseExcerpt: err.message
+        });
+        throw err;
+    }
+
+    if (qboResponse.Fault) {
+        const msg = qboResponse.Fault.Error.map(e =>
+            `${e.code}: ${e.Message}${e.Detail ? ' - ' + e.Detail : ''}`
+        ).join('; ');
+        await writeAuditLog({
+            action: 'refund.create',
+            entityType: 'Deposit',
+            status: 'error',
+            requestExcerpt: requestSummary,
+            responseExcerpt: msg
+        });
+        const err = new Error('QBO Deposit (refund) create failed: ' + msg);
+        err.qboFault = qboResponse.Fault;
+        throw err;
+    }
+
+    const deposit = qboResponse.Deposit;
+    if (!deposit || !deposit.Id) throw new Error('QBO returned no Deposit id');
+
+    await writeAuditLog({
+        action: 'refund.create',
+        entityType: 'Deposit',
+        entityQboId: deposit.Id,
+        status: 'success',
+        requestExcerpt: requestSummary,
+        responseExcerpt: `Deposit ${deposit.Id} created, total $${Number(deposit.TotalAmt).toFixed(2)}`
+    });
+
+    console.log(`✅ QBO Refund recorded: Deposit ${deposit.Id} — ${requestSummary}`);
+
+    return {
+        id: deposit.Id,
+        txnDate: deposit.TxnDate,
+        totalAmt: Number(deposit.TotalAmt),
+        vendorName,
+        depositAccountName: depositAcct.name,
+        categoryName: categoryAcct.name
+    };
+}
+
 /**
  * Aktualisiert eine bestehende QBO Purchase (Expense).
  * QBO erfordert ein VOLLSTÄNDIGES Update — die komplette Line-Liste muss
@@ -1268,6 +1406,7 @@ module.exports = {
     createVendor,
     createExpense,
     updateExpense,
+    createRefund,
     listExpenses,
     
     // Phase 2 Lieferung 3