diff --git a/app/src/main/java/dev/achmad/ledgerr/data/local/mapper/ExpenseMapper.kt b/app/src/main/java/dev/achmad/ledgerr/data/local/mapper/ExpenseMapper.kt
index 59cae18..cb98f0e 100644
--- a/app/src/main/java/dev/achmad/ledgerr/data/local/mapper/ExpenseMapper.kt
+++ b/app/src/main/java/dev/achmad/ledgerr/data/local/mapper/ExpenseMapper.kt
@@ -1,7 +1,9 @@
 package dev.achmad.ledgerr.data.local.mapper
 
+import dev.achmad.ledgerr.data.local.dao.ExpenseWithCategoryRow
 import dev.achmad.ledgerr.data.local.entity.ExpenseEntity
 import dev.achmad.ledgerr.domain.expense.model.Expense
+import dev.achmad.ledgerr.domain.expense.model.ExpenseWithCategory
 
 fun ExpenseEntity.toModel(): Expense = Expense(
     id = id,
@@ -22,3 +24,8 @@ fun Expense.toEntity(): ExpenseEntity = ExpenseEntity(
     recurringExpenseId = recurringExpenseId,
     createdAt = createdAt,
 )
+
+fun ExpenseWithCategoryRow.toModel(): ExpenseWithCategory = ExpenseWithCategory(
+    expense = expense.toModel(),
+    category = category.toModel(),
+)
diff --git a/app/src/main/java/dev/achmad/ledgerr/di/DomainModule.kt b/app/src/main/java/dev/achmad/ledgerr/di/DomainModule.kt
index 56481b8..756a20a 100644
--- a/app/src/main/java/dev/achmad/ledgerr/di/DomainModule.kt
+++ b/app/src/main/java/dev/achmad/ledgerr/di/DomainModule.kt
@@ -4,7 +4,12 @@ import dev.achmad.ledgerr.domain.category.interactor.DeleteCategory
 import dev.achmad.ledgerr.domain.category.interactor.GetCategories
 import dev.achmad.ledgerr.domain.category.interactor.SeedDefaultCategories
 import dev.achmad.ledgerr.domain.category.interactor.UpsertCategory
+import dev.achmad.ledgerr.domain.expense.interactor.DeleteExpense
+import dev.achmad.ledgerr.domain.expense.interactor.GetExpenseSummary
+import dev.achmad.ledgerr.domain.expense.interactor.GetExpenses
+import dev.achmad.ledgerr.domain.expense.interactor.InsertExpenses
 import dev.achmad.ledgerr.domain.expense.interactor.ReassignExpenseCategory
+import dev.achmad.ledgerr.domain.expense.interactor.UpsertExpense
 import org.koin.dsl.module
 
 val domainModule = module {
@@ -13,5 +18,10 @@ val domainModule = module {
     factory { DeleteCategory(get(), get(), get()) }
     factory { SeedDefaultCategories(get()) }
 
+    factory { GetExpenses(get(), get()) }
+    factory { UpsertExpense(get()) }
+    factory { InsertExpenses(get()) }
+    factory { DeleteExpense(get()) }
     factory { ReassignExpenseCategory(get()) }
+    factory { GetExpenseSummary(get(), get()) }
 }
diff --git a/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/DeleteExpense.kt b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/DeleteExpense.kt
new file mode 100644
index 0000000..7e6a648
--- /dev/null
+++ b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/DeleteExpense.kt
@@ -0,0 +1,11 @@
+package dev.achmad.ledgerr.domain.expense.interactor
+
+import dev.achmad.ledgerr.data.local.dao.ExpenseDao
+
+class DeleteExpense(
+    private val dao: ExpenseDao,
+) {
+    suspend fun await(id: Long) {
+        dao.deleteById(id)
+    }
+}
diff --git a/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/GetExpenseSummary.kt b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/GetExpenseSummary.kt
new file mode 100644
index 0000000..fb22cd7
--- /dev/null
+++ b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/GetExpenseSummary.kt
@@ -0,0 +1,33 @@
+package dev.achmad.ledgerr.domain.expense.interactor
+
+import dev.achmad.ledgerr.data.local.dao.CategoryDao
+import dev.achmad.ledgerr.data.local.dao.ExpenseDao
+import dev.achmad.ledgerr.data.local.mapper.toModel
+import dev.achmad.ledgerr.domain.expense.model.DateRange
+import dev.achmad.ledgerr.domain.expense.model.ExpenseSummary
+
+class GetExpenseSummary(
+    private val dao: ExpenseDao,
+    private val categoryDao: CategoryDao,
+) {
+    suspend fun await(range: DateRange): ExpenseSummary {
+        val expenses = dao.getByDateRange(
+            startDay = range.start.toEpochDay(),
+            endDay = range.end.toEpochDay(),
+        )
+        val totalAmount = expenses.sumOf { it.amount }
+        val categoryMap = categoryDao.getAll().associate { it.id to it.toModel() }
+        val byCategory = expenses
+            .groupBy { it.categoryId }
+            .mapNotNull { (categoryId, group) ->
+                val category = categoryMap[categoryId] ?: return@mapNotNull null
+                category to group.sumOf { it.amount }
+            }
+            .sortedByDescending { it.second }
+        return ExpenseSummary(
+            totalAmount = totalAmount,
+            byCategory = byCategory,
+            period = range,
+        )
+    }
+}
diff --git a/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/GetExpenses.kt b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/GetExpenses.kt
new file mode 100644
index 0000000..0781b5f
--- /dev/null
+++ b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/GetExpenses.kt
@@ -0,0 +1,60 @@
+package dev.achmad.ledgerr.domain.expense.interactor
+
+import dev.achmad.ledgerr.data.local.dao.CategoryDao
+import dev.achmad.ledgerr.data.local.dao.ExpenseDao
+import dev.achmad.ledgerr.data.local.mapper.toModel
+import dev.achmad.ledgerr.domain.expense.model.DateRange
+import dev.achmad.ledgerr.domain.expense.model.ExpenseWithCategory
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
+
+class GetExpenses(
+    private val dao: ExpenseDao,
+    private val categoryDao: CategoryDao,
+) {
+    fun subscribeAll(): Flow<List<ExpenseWithCategory>> =
+        dao.subscribeAll().map { rows -> rows.map { it.toModel() } }
+
+    fun subscribeByDateRange(range: DateRange): Flow<List<ExpenseWithCategory>> =
+        dao.subscribeByDateRange(
+            startDay = range.start.toEpochDay(),
+            endDay = range.end.toEpochDay(),
+        ).map { rows -> rows.map { it.toModel() } }
+
+    suspend fun awaitOne(id: Long): ExpenseWithCategory? {
+        val expense = dao.getById(id) ?: return null
+        val category = categoryDao.getById(expense.categoryId) ?: return null
+        return ExpenseWithCategory(
+            expense = expense.toModel(),
+            category = category.toModel(),
+        )
+    }
+
+    suspend fun awaitAll(
+        query: String = "",
+        range: DateRange? = null,
+    ): List<ExpenseWithCategory> {
+        val categoryMap = categoryDao.getAll().associate { it.id to it.toModel() }
+        val expenses = dao.search(
+            rangeStart = range?.start?.toEpochDay(),
+            rangeEnd = range?.end?.toEpochDay(),
+        )
+        return expenses
+            .filter { entity ->
+                if (query.isBlank()) return@filter true
+                val note = entity.note.orEmpty()
+                val amountStr = entity.amount.toString()
+                val categoryName = categoryMap[entity.categoryId]?.name.orEmpty()
+                note.contains(query, ignoreCase = true) ||
+                    amountStr.contains(query, ignoreCase = true) ||
+                    categoryName.contains(query, ignoreCase = true)
+            }
+            .mapNotNull { entity ->
+                val category = categoryMap[entity.categoryId] ?: return@mapNotNull null
+                ExpenseWithCategory(
+                    expense = entity.toModel(),
+                    category = category,
+                )
+            }
+    }
+}
diff --git a/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/InsertExpenses.kt b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/InsertExpenses.kt
new file mode 100644
index 0000000..3c82eaa
--- /dev/null
+++ b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/InsertExpenses.kt
@@ -0,0 +1,14 @@
+package dev.achmad.ledgerr.domain.expense.interactor
+
+import dev.achmad.ledgerr.data.local.dao.ExpenseDao
+import dev.achmad.ledgerr.data.local.mapper.toEntity
+import dev.achmad.ledgerr.domain.expense.model.Expense
+
+class InsertExpenses(
+    private val dao: ExpenseDao,
+) {
+    suspend fun awaitAll(expenses: List<Expense>) {
+        if (expenses.isEmpty()) return
+        dao.insertAll(expenses.map { it.toEntity() })
+    }
+}
diff --git a/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/UpsertExpense.kt b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/UpsertExpense.kt
new file mode 100644
index 0000000..dfa22a7
--- /dev/null
+++ b/app/src/main/java/dev/achmad/ledgerr/domain/expense/interactor/UpsertExpense.kt
@@ -0,0 +1,17 @@
+package dev.achmad.ledgerr.domain.expense.interactor
+
+import dev.achmad.ledgerr.data.local.dao.ExpenseDao
+import dev.achmad.ledgerr.data.local.mapper.toEntity
+import dev.achmad.ledgerr.domain.expense.model.Expense
+
+class UpsertExpense(
+    private val dao: ExpenseDao,
+) {
+    suspend fun await(expense: Expense): Long {
+        if (expense.id == 0L) {
+            return dao.insert(expense.toEntity())
+        }
+        dao.update(expense.toEntity())
+        return expense.id
+    }
+}