diff --git a/src-tauri/src/services/accounts/category.rs b/src-tauri/src/services/accounts/category.rs
deleted file mode 100644
index 18bb544..0000000
--- a/src-tauri/src/services/accounts/category.rs
+++ /dev/null
@@ -1,217 +0,0 @@
-// TODO: validation for all dto
-use crate::db::{
-    Db,
-    entities::account_category::{
-        ActiveModel as AccountCategoryActiveModel, Entity as AccountCategoryEntity,
-    },
-};
-use migration::OnConflict;
-use sea_orm::{
-    ActiveModelTrait, ActiveValue::Set, ColumnTrait, DatabaseConnection, EntityTrait,
-    IntoActiveModel, ModelTrait, PaginatorTrait, QueryFilter,
-};
-use serde::{Deserialize, Serialize};
-
-pub struct AccountCategory {
-    pub id: i64,
-    pub name: String,
-    pub account_type: AccountType,
-    //
-    pub created_at: String,
-    pub updated_at: String,
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub enum AccountType {
-    #[serde(rename = "Asset")]
-    Asset, // Positive balance, e.g. Checking, Savings
-    #[serde(rename = "Liability")]
-    Liability, // Negative balance, e.g. Credit Card
-    #[serde(other, rename = "Unknown")]
-    Unknown, // Fallback for unknown types
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct CreateAccountCategoryRequest {
-    pub name: String,
-    pub account_type: AccountType,
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct UpdateAccountCategoryRequest {
-    pub name: Option<String>,
-    pub account_type: Option<AccountType>,
-}
-
-impl From<String> for AccountType {
-    fn from(s: String) -> Self {
-        match s.as_str() {
-            "Asset" => AccountType::Asset,
-            "Liability" => AccountType::Liability,
-            _ => AccountType::Unknown,
-        }
-    }
-}
-
-impl std::fmt::Display for AccountType {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        match self {
-            AccountType::Asset => write!(f, "Asset"),
-            AccountType::Liability => write!(f, "Liability"),
-            AccountType::Unknown => write!(f, "Unknown"),
-        }
-    }
-}
-
-#[async_trait::async_trait]
-pub trait AccountCategoryService: Send + Sync + 'static {
-    async fn get_categories(&self) -> Result<Vec<AccountCategory>, String>;
-    async fn create_category(
-        &self,
-        create_request: CreateAccountCategoryRequest,
-    ) -> Result<i64, String>;
-
-    async fn create_category_with_tx(
-        &self,
-        create_request: CreateAccountCategoryRequest,
-        tx: &Db,
-    ) -> Result<i64, String>;
-
-    async fn update_category(
-        &self,
-        id: &i64,
-        update_request: UpdateAccountCategoryRequest,
-    ) -> Result<(), String>;
-
-    async fn update_category_with_tx(
-        &self,
-        id: &i64,
-        update_request: UpdateAccountCategoryRequest,
-        tx: &Db,
-    ) -> Result<(), String>;
-
-    async fn delete_category(&self, id: &i64) -> Result<(), String>;
-}
-
-pub struct AccountCategoryServiceImpl {
-    db: DatabaseConnection,
-}
-
-impl AccountCategoryServiceImpl {
-    pub fn new(db: DatabaseConnection) -> Self {
-        Self { db }
-    }
-}
-
-#[async_trait::async_trait]
-impl AccountCategoryService for AccountCategoryServiceImpl {
-    async fn get_categories(&self) -> Result<Vec<AccountCategory>, String> {
-        let categories = AccountCategoryEntity::find()
-            .all(&self.db)
-            .await
-            .map_err(|e| e.to_string())?;
-        Ok(categories
-            .into_iter()
-            .map(|model| AccountCategory {
-                id: model.id,
-                name: model.name,
-                account_type: AccountType::from(model.account_type),
-                created_at: model.created_at,
-                updated_at: model.updated_at,
-            })
-            .collect())
-    }
-
-    async fn create_category(
-        &self,
-        create_request: CreateAccountCategoryRequest,
-    ) -> Result<i64, String> {
-        self.create_category_with_tx(create_request, &(&self.db).into())
-            .await
-    }
-
-    async fn create_category_with_tx(
-        &self,
-        create_request: CreateAccountCategoryRequest,
-        tx: &Db,
-    ) -> Result<i64, String> {
-        let new_category = AccountCategoryActiveModel {
-            name: Set(create_request.name),
-            account_type: Set(create_request.account_type.to_string()),
-            created_at: Set(chrono::Utc::now().to_rfc3339()),
-            updated_at: Set(chrono::Utc::now().to_rfc3339()),
-            ..Default::default()
-        };
-        let res = AccountCategoryEntity::insert(new_category)
-            .on_conflict(
-                // force update to ensure a record is returned
-                OnConflict::column(crate::db::entities::account_category::Column::Name)
-                    .update_column(crate::db::entities::account_category::Column::Name)
-                    .to_owned(),
-            )
-            .exec_with_returning(tx)
-            .await
-            .map_err(|e| e.to_string())?;
-        Ok(res.id)
-    }
-
-    async fn delete_category(&self, id: &i64) -> Result<(), String> {
-        // check if any accounts are using this category before deleting
-        let accounts_using_category = crate::db::entities::account::Entity::find()
-            .filter(crate::db::entities::account::Column::AccountCategoryId.eq(*id))
-            .count(&self.db)
-            .await
-            .map_err(|e| e.to_string())?;
-
-        if accounts_using_category > 0 {
-            return Err("Cannot delete category that is in use by accounts".to_string());
-        }
-
-        let category = AccountCategoryEntity::find_by_id(*id)
-            .one(&self.db)
-            .await
-            .map_err(|e| e.to_string())?;
-        if let Some(category) = category {
-            category.delete(&self.db).await.map_err(|e| e.to_string())?;
-            Ok(())
-        } else {
-            Err("Category not found".to_string())
-        }
-    }
-
-    async fn update_category(
-        &self,
-        id: &i64,
-        update_request: UpdateAccountCategoryRequest,
-    ) -> Result<(), String> {
-        self.update_category_with_tx(id, update_request, &(&self.db).into())
-            .await
-    }
-
-    async fn update_category_with_tx(
-        &self,
-        id: &i64,
-        update_request: UpdateAccountCategoryRequest,
-        tx: &Db,
-    ) -> Result<(), String> {
-        let category = AccountCategoryEntity::find_by_id(*id)
-            .one(&self.db)
-            .await
-            .map_err(|e| e.to_string())
-            .map(|opt| opt.map(|model| model.into_active_model()))?;
-
-        if let Some(mut category) = category {
-            if let Some(name) = update_request.name {
-                category.name = Set(name);
-            }
-            if let Some(account_type) = update_request.account_type {
-                category.account_type = Set(account_type.to_string());
-            }
-            category.updated_at = Set(chrono::Utc::now().to_rfc3339());
-            category.update(tx).await.map_err(|e| e.to_string())?;
-            Ok(())
-        } else {
-            Err("Category not found".to_string())
-        }
-    }
-}
diff --git a/src-tauri/src/services/accounts/dto.rs b/src-tauri/src/services/accounts/dto.rs
new file mode 100644
index 0000000..344f76c
--- /dev/null
+++ b/src-tauri/src/services/accounts/dto.rs
@@ -0,0 +1,130 @@
+use sea_orm::ActiveValue::Set;
+use serde::{Deserialize, Serialize};
+
+use crate::{
+    db::{
+        DbServiceError,
+        entities::{
+            account::{ActiveModel as AccountActiveModel, Model as AccountModel},
+            account_category::Model as AccountCategoryModel,
+        },
+    },
+    services::accounts::category::{
+        AccountCategoryServiceError, AccountType, CreateAccountCategoryRequest,
+        UpdateAccountCategoryRequest,
+    },
+};
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum AccountsServiceError {
+    #[error("database error: {0}")]
+    DbErr(#[from] DbServiceError),
+    #[error("Target not found: {0}")]
+    TargetNotFound(String),
+    #[error("Validation error: {0}")]
+    Validation(String),
+    #[error("unknown error: {0}")]
+    Unknown(String),
+}
+
+impl From<sea_orm::DbErr> for AccountsServiceError {
+    fn from(err: sea_orm::DbErr) -> Self {
+        AccountsServiceError::DbErr(DbServiceError::from(err))
+    }
+}
+
+impl From<AccountCategoryServiceError> for AccountsServiceError {
+    fn from(err: AccountCategoryServiceError) -> Self {
+        match err {
+            AccountCategoryServiceError::DbErr(db_err) => AccountsServiceError::DbErr(db_err),
+            AccountCategoryServiceError::Validation(msg) => AccountsServiceError::Validation(msg),
+            AccountCategoryServiceError::TargetNotFound(msg) => {
+                AccountsServiceError::TargetNotFound(msg)
+            }
+            AccountCategoryServiceError::Unknown(msg) => AccountsServiceError::Unknown(msg),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Account {
+    pub id: i64,
+    pub name: String,
+    pub account_type: AccountType,
+    pub account_category: String,
+    //
+    pub created_at: String,
+    pub updated_at: String,
+}
+
+impl From<(AccountModel, AccountCategoryModel)> for Account {
+    fn from((account_model, category_model): (AccountModel, AccountCategoryModel)) -> Self {
+        Account {
+            id: account_model.id,
+            name: account_model.name,
+            account_type: AccountType::from(category_model.account_type),
+            account_category: category_model.name,
+            created_at: account_model.created_at,
+            updated_at: account_model.updated_at,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CreateAccountRequest {
+    pub name: String,
+    pub category: CreateAccountCategoryRequest,
+}
+
+impl CreateAccountRequest {
+    pub fn validate(&self) -> Result<(), AccountsServiceError> {
+        if self.name.trim().is_empty() {
+            return Err(AccountsServiceError::Validation(
+                "Account name cannot be empty".to_string(),
+            ));
+        }
+        self.category.validate()?;
+        Ok(())
+    }
+}
+
+impl From<(CreateAccountRequest, i64)> for AccountActiveModel {
+    fn from((request, category_id): (CreateAccountRequest, i64)) -> Self {
+        AccountActiveModel {
+            name: Set(request.name),
+            account_category_id: Set(category_id),
+            created_at: Set(chrono::Utc::now().to_rfc3339()),
+            updated_at: Set(chrono::Utc::now().to_rfc3339()),
+            ..Default::default()
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct UpdateAccountRequest {
+    pub name: Option<String>,
+    pub category: Option<UpdateAccountCategoryRequest>,
+}
+
+impl UpdateAccountRequest {
+    pub fn validate(&self) -> Result<(), AccountsServiceError> {
+        if let Some(name) = &self.name {
+            if name.trim().is_empty() {
+                return Err(AccountsServiceError::Validation(
+                    "Account name cannot be empty".to_string(),
+                ));
+            }
+        }
+        if let Some(category) = &self.category {
+            category.validate()?;
+        }
+        Ok(())
+    }
+
+    pub fn apply_to(&self, account: &mut AccountActiveModel) {
+        if let Some(name) = &self.name {
+            account.name = Set(name.clone());
+        }
+    }
+}
diff --git a/src-tauri/src/services/accounts/mod.rs b/src-tauri/src/services/accounts/mod.rs
index 15cb159..4169cfb 100644
--- a/src-tauri/src/services/accounts/mod.rs
+++ b/src-tauri/src/services/accounts/mod.rs
@@ -1,191 +1,7 @@
-// TODO: validation for all dto
-use std::sync::Arc;
-
-use crate::{
-    db::entities::{
-        account::{
-            ActiveModel as AccountActiveModel, Entity as AccountEntity, Model as AccountModel,
-        },
-        account_category::{
-            ActiveModel as AccountCategoryActiveModel, Entity as AccountCategoryEntity,
-            Model as AccountCategoryModel,
-        },
-    },
-    services::accounts::category::{
-        AccountType, CreateAccountCategoryRequest, UpdateAccountCategoryRequest,
-    },
-};
-use sea_orm::{
-    ActiveModelTrait, ActiveValue::Set, DatabaseConnection, EntityTrait, TransactionTrait,
-};
-use serde::{Deserialize, Serialize};
-
 pub mod category;
+mod dto;
+mod repo;
+mod service;
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct Account {
-    pub id: i64,
-    pub name: String,
-    pub account_type: AccountType,
-    pub account_category: String,
-    //
-    pub created_at: String,
-    pub updated_at: String,
-}
-
-impl From<(AccountModel, AccountCategoryModel)> for Account {
-    fn from((account_model, category_model): (AccountModel, AccountCategoryModel)) -> Self {
-        Account {
-            id: account_model.id,
-            name: account_model.name,
-            account_type: AccountType::from(category_model.account_type),
-            account_category: category_model.name,
-            created_at: account_model.created_at,
-            updated_at: account_model.updated_at,
-        }
-    }
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct CreateAccountRequest {
-    pub name: String,
-    pub category: CreateAccountCategoryRequest,
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct UpdateAccountRequest {
-    pub name: Option<String>,
-    pub category: Option<UpdateAccountCategoryRequest>,
-}
-
-#[async_trait::async_trait]
-pub trait AccountsService: Send + Sync + 'static {
-    async fn get_accounts(&self) -> Result<Vec<Account>, String>;
-    async fn get_account(&self, id: &i64) -> Result<Option<Account>, String>;
-    async fn create_account(&self, create_request: CreateAccountRequest) -> Result<i64, String>;
-    async fn update_account(
-        &self,
-        id: &i64,
-        update_request: UpdateAccountRequest,
-    ) -> Result<(), String>;
-    async fn delete_account(&self, id: &i64) -> Result<(), String>;
-}
-
-pub struct AccountsServiceImpl {
-    db: DatabaseConnection,
-    account_category_service: Arc<dyn category::AccountCategoryService>,
-}
-
-impl AccountsServiceImpl {
-    pub fn new(
-        db: DatabaseConnection,
-        account_category_service: Arc<dyn category::AccountCategoryService>,
-    ) -> Self {
-        Self {
-            db,
-            account_category_service,
-        }
-    }
-}
-
-#[async_trait::async_trait]
-impl AccountsService for AccountsServiceImpl {
-    async fn get_accounts(&self) -> Result<Vec<Account>, String> {
-        let accounts = AccountEntity::find()
-            .find_both_related(AccountCategoryEntity)
-            .all(&self.db)
-            .await;
-        match accounts {
-            Ok(accounts) => Ok(accounts.into_iter().map(|a| a.into()).collect()),
-            Err(e) => Err(format!("Failed to fetch accounts: {}", e)),
-        }
-    }
-
-    async fn get_account(&self, id: &i64) -> Result<Option<Account>, String> {
-        let result = AccountEntity::find_by_id(*id)
-            .find_both_related(AccountCategoryEntity)
-            .one(&self.db)
-            .await;
-
-        match result {
-            Ok(Some(account)) => Ok(Some(account.into())),
-            Ok(None) => Ok(None),
-            Err(e) => Err(format!("Failed to fetch account: {}", e)),
-        }
-    }
-
-    async fn create_account(&self, create_request: CreateAccountRequest) -> Result<i64, String> {
-        let tx = self.db.begin().await.map_err(|e| e.to_string())?;
-
-        let category_id = self
-            .account_category_service
-            .create_category_with_tx(
-                CreateAccountCategoryRequest {
-                    name: create_request.category.name,
-                    account_type: create_request.category.account_type,
-                },
-                &(&tx).into(),
-            )
-            .await?;
-
-        let new_account = AccountEntity::insert(AccountActiveModel {
-            name: Set(create_request.name),
-            created_at: Set(chrono::Utc::now().to_rfc3339()),
-            updated_at: Set(chrono::Utc::now().to_rfc3339()),
-            account_category_id: Set(category_id),
-            ..Default::default()
-        })
-        .exec(&tx)
-        .await;
-
-        tx.commit().await.map_err(|e| e.to_string())?;
-
-        match new_account {
-            Ok(res) => Ok(res.last_insert_id),
-            Err(e) => Err(format!("Failed to create account: {}", e)),
-        }
-    }
-
-    async fn update_account(
-        &self,
-        id: &i64,
-        update_request: UpdateAccountRequest,
-    ) -> Result<(), String> {
-        let tx = self.db.begin().await.map_err(|e| e.to_string())?;
-        let account = AccountEntity::find_by_id(*id).one(&tx).await;
-        match account {
-            Ok(Some(account)) => {
-                let mut active_model: AccountActiveModel = account.into();
-                // Only update fields that are provided in the request
-                if let Some(name) = update_request.name {
-                    active_model.name = Set(name);
-                }
-                //
-                if let Some(category_request) = update_request.category {
-                    // update the category if it is provided in the request
-                    self.account_category_service
-                        .update_category_with_tx(id, category_request, &(&tx).into())
-                        .await?;
-                }
-                active_model.updated_at = Set(chrono::Utc::now().to_rfc3339());
-                //
-                active_model.update(&tx).await.map_err(|e| e.to_string())?;
-                let res = tx.commit().await.map_err(|e| e.to_string());
-                match res {
-                    Ok(_) => Ok(()),
-                    Err(e) => Err(format!("Failed to update account: {}", e)),
-                }
-            }
-            Ok(None) => Err("Account not found".to_string()),
-            Err(e) => Err(format!("Failed to fetch account: {}", e)),
-        }
-    }
-
-    async fn delete_account(&self, id: &i64) -> Result<(), String> {
-        let res = AccountEntity::delete_by_id(*id).exec(&self.db).await;
-        match res {
-            Ok(_) => Ok(()),
-            Err(e) => Err(format!("Failed to delete account: {}", e)),
-        }
-    }
-}
+pub use dto::*;
+pub use service::*;
diff --git a/src-tauri/src/services/accounts/repo.rs b/src-tauri/src/services/accounts/repo.rs
new file mode 100644
index 0000000..5e27b13
--- /dev/null
+++ b/src-tauri/src/services/accounts/repo.rs
@@ -0,0 +1,150 @@
+use std::sync::Arc;
+
+use sea_orm::{
+    ActiveModelTrait, ActiveValue::Set, DatabaseConnection, EntityTrait, TransactionTrait,
+};
+
+use crate::{
+    db::entities::{
+        account::{ActiveModel as AccountActiveModel, Entity as AccountEntity},
+        account_category::Entity as AccountCategoryEntity,
+    },
+    services::accounts::{
+        category::CreateAccountCategoryRequest,
+        dto::{Account, AccountsServiceError, CreateAccountRequest, UpdateAccountRequest},
+    },
+};
+
+#[async_trait::async_trait]
+pub trait AccountsRepoService: Send + Sync + 'static {
+    async fn get_accounts(&self) -> Result<Vec<Account>, AccountsServiceError>;
+    async fn get_account(&self, id: &i64) -> Result<Option<Account>, AccountsServiceError>;
+    async fn create_account(
+        &self,
+        create_request: CreateAccountRequest,
+    ) -> Result<i64, AccountsServiceError>;
+    async fn update_account(
+        &self,
+        id: &i64,
+        update_request: UpdateAccountRequest,
+    ) -> Result<(), AccountsServiceError>;
+    async fn delete_account(&self, id: &i64) -> Result<(), AccountsServiceError>;
+}
+
+pub struct AccountsRepoServiceImpl<T>
+where
+    T: super::category::AccountCategoryService + ?Sized,
+{
+    db: DatabaseConnection,
+    account_category_service: Arc<T>,
+}
+
+impl<T> AccountsRepoServiceImpl<T>
+where
+    T: super::category::AccountCategoryService + ?Sized,
+{
+    pub fn new(db: DatabaseConnection, account_category_service: Arc<T>) -> Self {
+        Self {
+            db,
+            account_category_service,
+        }
+    }
+}
+
+#[async_trait::async_trait]
+impl<T> AccountsRepoService for AccountsRepoServiceImpl<T>
+where
+    T: super::category::AccountCategoryService + ?Sized,
+{
+    async fn get_accounts(&self) -> Result<Vec<Account>, AccountsServiceError> {
+        let accounts = AccountEntity::find()
+            .find_both_related(AccountCategoryEntity)
+            .all(&self.db)
+            .await?;
+        Ok(accounts.into_iter().map(|a| a.into()).collect())
+    }
+
+    async fn get_account(&self, id: &i64) -> Result<Option<Account>, AccountsServiceError> {
+        let result = AccountEntity::find_by_id(*id)
+            .find_both_related(AccountCategoryEntity)
+            .one(&self.db)
+            .await;
+
+        match result {
+            Ok(Some(account)) => Ok(Some(account.into())),
+            Ok(None) => Ok(None),
+            Err(e) => Err(e.into()),
+        }
+    }
+
+    async fn create_account(
+        &self,
+        create_request: CreateAccountRequest,
+    ) -> Result<i64, AccountsServiceError> {
+        let tx = self.db.begin().await?;
+
+        let category_id = self
+            .account_category_service
+            .create_category_with_tx(
+                CreateAccountCategoryRequest {
+                    name: create_request.category.name,
+                    account_type: create_request.category.account_type,
+                },
+                &(&tx).into(),
+            )
+            .await?;
+
+        let new_account = AccountEntity::insert(AccountActiveModel {
+            name: Set(create_request.name),
+            created_at: Set(chrono::Utc::now().to_rfc3339()),
+            updated_at: Set(chrono::Utc::now().to_rfc3339()),
+            account_category_id: Set(category_id),
+            ..Default::default()
+        })
+        .exec(&tx)
+        .await?;
+
+        tx.commit().await?;
+
+        Ok(new_account.last_insert_id)
+    }
+
+    async fn update_account(
+        &self,
+        id: &i64,
+        update_request: UpdateAccountRequest,
+    ) -> Result<(), AccountsServiceError> {
+        let tx = self.db.begin().await?;
+        let account = AccountEntity::find_by_id(*id).one(&tx).await;
+        match account {
+            Ok(Some(account)) => {
+                let mut active_model: AccountActiveModel = account.into();
+                // Only update fields that are provided in the request
+                if let Some(name) = update_request.name {
+                    active_model.name = Set(name);
+                }
+                //
+                if let Some(category_request) = update_request.category {
+                    // update the category if it is provided in the request
+                    self.account_category_service
+                        .update_category_with_tx(id, category_request, &(&tx).into())
+                        .await?;
+                }
+                active_model.updated_at = Set(chrono::Utc::now().to_rfc3339());
+                //
+                active_model.update(&tx).await?;
+                tx.commit().await?;
+                Ok(())
+            }
+            Ok(None) => Err(AccountsServiceError::TargetNotFound(
+                "Account not found".to_string(),
+            )),
+            Err(e) => Err(e.into()),
+        }
+    }
+
+    async fn delete_account(&self, id: &i64) -> Result<(), AccountsServiceError> {
+        AccountEntity::delete_by_id(*id).exec(&self.db).await?;
+        Ok(())
+    }
+}
diff --git a/src-tauri/src/services/accounts/service.rs b/src-tauri/src/services/accounts/service.rs
new file mode 100644
index 0000000..3981244
--- /dev/null
+++ b/src-tauri/src/services/accounts/service.rs
@@ -0,0 +1,78 @@
+use std::sync::Arc;
+
+use crate::services::accounts::{
+    Account, AccountsServiceError, CreateAccountRequest, UpdateAccountRequest,
+};
+use sea_orm::DatabaseConnection;
+
+#[async_trait::async_trait]
+pub trait AccountsService: Send + Sync + 'static {
+    async fn get_accounts(&self) -> Result<Vec<Account>, AccountsServiceError>;
+    async fn get_account(&self, id: &i64) -> Result<Option<Account>, AccountsServiceError>;
+    async fn create_account(
+        &self,
+        create_request: CreateAccountRequest,
+    ) -> Result<i64, AccountsServiceError>;
+    async fn update_account(
+        &self,
+        id: &i64,
+        update_request: UpdateAccountRequest,
+    ) -> Result<(), AccountsServiceError>;
+    async fn delete_account(&self, id: &i64) -> Result<(), AccountsServiceError>;
+}
+
+pub struct AccountsServiceImpl<T>
+where
+    T: super::repo::AccountsRepoService + ?Sized,
+{
+    db: DatabaseConnection,
+    repo: Arc<T>,
+}
+
+impl<T> AccountsServiceImpl<super::repo::AccountsRepoServiceImpl<T>>
+where
+    T: super::category::AccountCategoryService + ?Sized,
+{
+    pub fn new(db: DatabaseConnection, account_category_service: Arc<T>) -> Self {
+        Self {
+            db: db.clone(),
+            repo: Arc::new(super::repo::AccountsRepoServiceImpl::new(
+                db.clone(),
+                account_category_service,
+            )),
+        }
+    }
+}
+
+#[async_trait::async_trait]
+impl<T> AccountsService for AccountsServiceImpl<T>
+where
+    T: super::repo::AccountsRepoService + ?Sized,
+{
+    async fn get_accounts(&self) -> Result<Vec<Account>, AccountsServiceError> {
+        self.repo.get_accounts().await
+    }
+
+    async fn get_account(&self, id: &i64) -> Result<Option<Account>, AccountsServiceError> {
+        self.repo.get_account(id).await
+    }
+
+    async fn create_account(
+        &self,
+        create_request: CreateAccountRequest,
+    ) -> Result<i64, AccountsServiceError> {
+        self.repo.create_account(create_request).await
+    }
+
+    async fn update_account(
+        &self,
+        id: &i64,
+        update_request: UpdateAccountRequest,
+    ) -> Result<(), AccountsServiceError> {
+        self.repo.update_account(id, update_request).await
+    }
+
+    async fn delete_account(&self, id: &i64) -> Result<(), AccountsServiceError> {
+        self.repo.delete_account(id).await
+    }
+}
diff --git a/src-tauri/src/services/transaction/dto.rs b/src-tauri/src/services/transaction/dto.rs
index cb6f1ff..8e04d2e 100644
--- a/src-tauri/src/services/transaction/dto.rs
+++ b/src-tauri/src/services/transaction/dto.rs
@@ -7,7 +7,10 @@ use crate::{
         DbServiceError,
         entities::{account::Column::Id, transaction::Model as TransactionModel},
     },
-    services::transaction::{category::CategoryServiceError, tag::TagServiceError},
+    services::{
+        accounts::{Account, AccountsServiceError},
+        transaction::{category::CategoryServiceError, tag::TagServiceError},
+    },
 };
 
 use crate::db::{
@@ -61,6 +64,19 @@ impl From<CategoryServiceError> for TransactionServiceError {
     }
 }
 
+impl From<AccountsServiceError> for TransactionServiceError {
+    fn from(err: AccountsServiceError) -> Self {
+        match err {
+            AccountsServiceError::DbErr(db_err) => TransactionServiceError::DbErr(db_err),
+            AccountsServiceError::TargetNotFound(msg) => {
+                TransactionServiceError::TargetNotFound(msg)
+            }
+            AccountsServiceError::Validation(msg) => TransactionServiceError::Validation(msg),
+            AccountsServiceError::Unknown(msg) => TransactionServiceError::Unknown(msg),
+        }
+    }
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum TransactionType {
     #[serde(rename = "STANDARD")]
@@ -158,12 +174,7 @@ async fn validate_account_exists<T>(
 where
     T: crate::services::accounts::AccountsService + ?Sized,
 {
-    let account_exists = account_service
-        .get_account(&account_id)
-        .await
-        // TODO: add error from account service to error chain
-        .map_err(|err| TransactionServiceError::Unknown(err))?
-        .is_some();
+    let account_exists = account_service.get_account(&account_id).await?.is_some();
     if !account_exists {
         return Err(TransactionServiceError::Validation(format!(
             "Account with id {} does not exist",