diff --git a/app/src/components/StepsStepper.vue b/app/src/components/StepsStepper.vue
index 18f059f..7879eba 100644
--- a/app/src/components/StepsStepper.vue
+++ b/app/src/components/StepsStepper.vue
@@ -69,6 +69,7 @@ const currentComponent = computed(() => {
   if (id === 'children') return defineAsyncComponent(() => import('./steps/ChildrenStep.vue'))
   if (id === 'income') return defineAsyncComponent(() => import('./steps/IncomeStep.vue'))
   if (id === 'professionalExpenses') return defineAsyncComponent(() => import('./steps/ProfessionalExpensesStep.vue'))
+  if (id === 'sideIncome') return defineAsyncComponent(() => import('./steps/SideIncomeStep.vue'))
   return null
 })
 
diff --git a/app/src/components/steps/SideIncomeStep.vue b/app/src/components/steps/SideIncomeStep.vue
new file mode 100644
index 0000000..4f566de
--- /dev/null
+++ b/app/src/components/steps/SideIncomeStep.vue
@@ -0,0 +1,83 @@
+<template>
+  <q-card flat class="full-width q-pa-none">
+    <q-card-section class="full-width">
+      <div class="row items-center">
+        <div class="col">
+          <div class="text-h6">{{ t('SID') }}</div>
+        </div>
+        <div class="col-auto">
+          <q-btn flat :label="t('button.prev')" @click="emitPrev" class="q-mr-sm" />
+          <q-btn color="primary" :label="t('button.next')" @click="saveAndNext" />
+        </div>
+      </div>
+      <q-separator class="q-my-sm" />
+
+      <q-form ref="formRef" class="q-gutter-md q-mt-md">
+
+        <q-toggle class="q-mb-md"          v-model="form.hasSideIncome"
+          :label="t('sideIncome.hasSideIncome')"
+        />
+
+
+        <CommentAttachment
+                class="q-mt-none"
+                v-if="form.hasSideIncome"
+                v-model="form.sideIncomeDocuments"
+                :label="t('sideIncome.attachments')"
+                :id="'documents'"
+              />
+      </q-form>
+    </q-card-section>
+  </q-card>
+</template>
+
+<script setup lang="ts">
+import { onMounted, ref, nextTick, watch } from 'vue'
+import { useI18n } from 'vue-i18n'
+import type { StepDescriptor } from '../../types/types'
+import { useSideIncomeStore, type SideIncomeData } from '../../stores/sideIncome'
+
+import CommentAttachment from '../CommentAttachment.vue'
+
+const props = defineProps<{ step?: StepDescriptor }>()
+const emit = defineEmits(['next', 'prev'])
+
+const { t } = useI18n()
+const store = useSideIncomeStore()
+const form = store.data as SideIncomeData
+
+const formRef = ref<{ validate?: () => Promise<boolean> | boolean; resetValidation?: () => void } | null>(null)
+
+onMounted(async () => {
+  await nextTick()
+  formRef.value?.resetValidation?.()
+})
+
+watch(
+  () => form,
+  () => {
+    store.persist()
+  },
+  { deep: true }
+)
+
+async function saveAndNext() {
+  try {
+    const ok = await (formRef.value?.validate?.() ?? true)
+    if (ok === false) return
+  } catch {
+    return
+  }
+  store.setSideIncome(form)
+  emit('next', props.step?.next)
+}
+
+function emitPrev() {
+  store.setSideIncome(form)
+  emit('prev', props.step?.prev)
+}
+</script>
+
+<style scoped>
+.full-width { width: 100%; }
+</style>
diff --git a/app/src/generated/commit-info.ts b/app/src/generated/commit-info.ts
index 2a511ef..56041af 100644
--- a/app/src/generated/commit-info.ts
+++ b/app/src/generated/commit-info.ts
@@ -1,2 +1,2 @@
 // Auto-generated by scripts/generate-commit-info.mjs
-export const COMMIT_CODE = "62da803" as const
+export const COMMIT_CODE = "7f3543f" as const
diff --git a/app/src/i18n/locales/de-DE/steps.ts b/app/src/i18n/locales/de-DE/steps.ts
index 2c38aac..e55fb00 100644
--- a/app/src/i18n/locales/de-DE/steps.ts
+++ b/app/src/i18n/locales/de-DE/steps.ts
@@ -96,6 +96,11 @@ export default {
     noAttachments: 'Dokumente anhängen'
   },
 
+  sideIncome: {
+    hasSideIncome: 'Haben Sie ein Nebeneinkommen?',
+    attachments: 'Dokumente anhängen'
+  },
+
   informazionesualimenti: 'Informationen zu Unterhalt',
   inserireindirizzocogniuge: 'Adresse des Ehepartners eingeben',
   inserireindirizzopartner: 'Adresse des Partners eingeben',
diff --git a/app/src/i18n/locales/en-US/steps.ts b/app/src/i18n/locales/en-US/steps.ts
index 2f39f2b..d059126 100644
--- a/app/src/i18n/locales/en-US/steps.ts
+++ b/app/src/i18n/locales/en-US/steps.ts
@@ -112,6 +112,11 @@ export default {
     hasCanteenOrVouchers: 'Do you have a canteen or meal vouchers?'
   },
 
+  sideIncome: {
+    hasSideIncome: 'Do you have supplementary income?',
+    attachments: 'Attach documents'
+  },
+
   informazionesualimenti: 'Alimony information',
   inserireindirizzocogniuge: 'Enter spouse address',
   inserireindirizzopartner: 'Enter partner address',
diff --git a/app/src/i18n/locales/fr-FR/steps.ts b/app/src/i18n/locales/fr-FR/steps.ts
index dd0da5f..e11bc44 100644
--- a/app/src/i18n/locales/fr-FR/steps.ts
+++ b/app/src/i18n/locales/fr-FR/steps.ts
@@ -96,6 +96,11 @@ export default {
     noAttachments: 'Joindre des documents'
   },
 
+  sideIncome: {
+    hasSideIncome: 'Avez-vous un revenu accessoire ?',
+    attachments: 'Joindre des documents'
+  },
+
   informazionesualimenti: 'Informations sur la pension alimentaire',
   inserireindirizzocogniuge: "Saisir l'adresse du conjoint",
   inserireindirizzopartner: "Saisir l'adresse du partenaire",
diff --git a/app/src/i18n/locales/it-IT/steps.ts b/app/src/i18n/locales/it-IT/steps.ts
index 5816cce..30f97e4 100644
--- a/app/src/i18n/locales/it-IT/steps.ts
+++ b/app/src/i18n/locales/it-IT/steps.ts
@@ -112,6 +112,11 @@ export default {
     hasCanteenOrVouchers: 'Hai mensa o buoni pasto?'
   },
 
+  sideIncome: {
+    hasSideIncome: 'Hai un reddito accessorio?',
+    attachments: 'Allega i documenti'
+  },
+
   informazionesualimenti: 'Informazioni su alimenti',
   inserireindirizzocogniuge: "Inserire l'indirizzo del coniuge",
   inserireindirizzopartner: "Inserire l'indirizzo del partner",
diff --git a/app/src/stores/sideIncome.ts b/app/src/stores/sideIncome.ts
new file mode 100644
index 0000000..dd6da38
--- /dev/null
+++ b/app/src/stores/sideIncome.ts
@@ -0,0 +1,67 @@
+import { defineStore } from 'pinia'
+import { LocalStorage } from 'quasar'
+
+export interface SideIncomeData {
+  hasSideIncome: boolean,
+  sideIncomeDocuments: {
+    comments: string,
+    attachments: []
+  }
+
+}
+
+const STORAGE_KEY = 'sideIncome:v1'
+
+const DEFAULT: SideIncomeData = {
+  hasSideIncome: false,
+  sideIncomeDocuments:  { comments: '', attachments: [] }
+}
+
+function isRecord(v: unknown): v is Record<string, unknown> {
+  return !!v && typeof v === 'object' && !Array.isArray(v)
+}
+
+export const useSideIncomeStore = defineStore('sideincomestore', {
+  state: () => {
+    try {
+      let saved: unknown = LocalStorage.getItem(STORAGE_KEY)
+      if (typeof saved === 'string') {
+        try {
+          saved = JSON.parse(saved)
+        } catch {
+          saved = null
+        }
+      }
+      if (isRecord(saved)) {
+        return { data: { ...DEFAULT, ...(saved as Partial<SideIncomeData>) } as SideIncomeData }
+      }
+    } catch {
+      // ignore and fall back to default
+    }
+    return { data: { ...DEFAULT } as SideIncomeData }
+  },
+  actions: {
+    persist() {
+      try {
+        LocalStorage.set(STORAGE_KEY, this.data)
+      } catch (err) {
+        console.error('sideIncome.store: persist error', err)
+      }
+    },
+    getSideIncome() {
+      return this.data
+    },
+    setSideIncome(partial: Partial<SideIncomeData>) {
+      this.data = { ...this.data, ...partial }
+      this.persist()
+    },
+    replaceSideIncome(payload: SideIncomeData) {
+      this.data = payload
+      this.persist()
+    },
+    resetSideIncome() {
+      this.data = { ...DEFAULT }
+      this.persist()
+    }
+  }
+})