diff --git a/src/classifier.rs b/src/classifier.rs
index c5cc3ba..6e0c75e 100644
--- a/src/classifier.rs
+++ b/src/classifier.rs
@@ -1,7 +1,7 @@
 use crate::{Account, Transaction, TransactionDetails};
 use chrono::{Datelike, NaiveDate};
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Hash, Eq, Clone)]
 pub enum Category {
     Zero815,
     Book,
@@ -40,7 +40,7 @@ pub enum Category {
     Hardware(Hardware),
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Hash, Eq, Clone)]
 pub enum Hardware {
     Laptop,
     Remarkable,
@@ -53,9 +53,9 @@ impl From<Hardware> for Category {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Hash, Eq, Clone)]
 pub enum Travel {
-    eSIM,
+    Esim,
 }
 
 impl From<Travel> for Category {
@@ -64,7 +64,7 @@ impl From<Travel> for Category {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Hash, Eq, Clone)]
 pub enum Tech {
     LLM,
     MediaMarkt,
@@ -80,7 +80,7 @@ impl From<Tech> for Category {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Hash, Eq, Clone)]
 pub enum Restaurant {
     Proper,
     FastFood,
@@ -94,7 +94,7 @@ impl From<Restaurant> for Category {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Hash, Eq, Clone)]
 pub enum Sport {
     Squash,
     SportOkay,
@@ -108,7 +108,7 @@ impl From<Sport> for Category {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Hash, Eq, Clone)]
 pub enum Groceries {
     Hofer,
     Lidl,
@@ -125,7 +125,7 @@ impl From<Groceries> for Category {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Hash, Eq, Clone)]
 pub enum Transport {
     LinzLinien,
     Nextbike,
@@ -141,7 +141,7 @@ impl From<Transport> for Category {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Hash, Eq, Clone)]
 pub enum Donation {
     RemarkableRCU,
     Signal,
@@ -377,7 +377,7 @@ pub fn cat(details: &TransactionDetails) -> Category {
         return Category::Household("Schuhe".into());
     }
     if details.desc == "AIRALO" {
-        return Travel::eSIM.into();
+        return Travel::Esim.into();
     }
     if details.desc == "Autobahnrasthaus Chiem" || details.desc == "Cafe+Co AT 311530" {
         return Category::CoffeeToGo;
diff --git a/src/lib.rs b/src/lib.rs
index 4aa4748..f579907 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,10 @@
 pub mod classifier;
+mod n26;
+pub mod stat;
 
 use crate::classifier::Category;
 use chrono::NaiveDate;
+use std::fmt::Display;
 
 #[derive(Debug, PartialEq)]
 pub enum Account {
@@ -21,3 +24,22 @@ pub struct Transaction {
     pub details: TransactionDetails,
     pub cat: Category,
 }
+
+pub struct Overview {
+    transactions: Vec<Transaction>,
+}
+
+impl Overview {
+    pub fn new() -> Self {
+        Self {
+            transactions: Vec::new(),
+        }
+    }
+}
+
+impl Display for Overview {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(&format!("{} transactions", self.transactions.len()))?;
+        Ok(())
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index b9d68dd..4071d73 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,13 @@
-mod n26;
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 
 fn main() {
-    n26::Transaction::from_file("./data/n26-2025-10-16.csv");
+    tracing_subscriber::registry()
+        .with(tracing_subscriber::fmt::layer())
+        .init();
+
+    let mut overview = fin::Overview::new();
+    overview.n26("./data/n26-2025-10-16.csv");
+
+    overview.by_month();
+    println!("{overview}");
 }
diff --git a/src/n26.rs b/src/n26.rs
index 7e99361..c14c79d 100644
--- a/src/n26.rs
+++ b/src/n26.rs
@@ -1,12 +1,20 @@
+use crate::{Account, Overview, TransactionDetails};
 use chrono::NaiveDate;
 use csv::Reader;
-use fin::{Account, TransactionDetails};
 use serde::Deserialize;
 use std::fs::File;
 use tracing::info;
 
+impl Overview {
+    pub fn n26(&mut self, path: &str) {
+        let mut transactions = Transaction::from_file(path);
+        info!("Added {} transactions.", transactions.len());
+        self.transactions.append(&mut transactions);
+    }
+}
+
 #[derive(Debug, Deserialize)]
-pub struct Transaction {
+struct Transaction {
     #[serde(rename = "Booking Date")]
     booking_date: String,
     #[serde(rename = "Value Date")]
@@ -31,7 +39,7 @@ pub struct Transaction {
     exchange_rate: Option<f64>,
 }
 
-impl From<Transaction> for fin::Transaction {
+impl From<Transaction> for crate::Transaction {
     fn from(value: Transaction) -> Self {
         let date = if let Some(date) = value.value_date {
             // If value_date exist, use this as it's earlier and closer to real date...
@@ -42,6 +50,7 @@ impl From<Transaction> for fin::Transaction {
         };
         let date = NaiveDate::parse_from_str(&date, "%Y-%m-%d").unwrap();
         let amount_in_cent = (value.amount_eur * 100.).round() as i64;
+        let amount_in_cent = amount_in_cent.abs();
         let desc = if let Some(desc) = value.partner_name {
             desc.clone()
         } else {
@@ -60,16 +69,14 @@ impl From<Transaction> for fin::Transaction {
 }
 
 impl Transaction {
-    pub fn from_file(path: &str) -> Vec<fin::Transaction> {
+    fn from_file(path: &str) -> Vec<crate::Transaction> {
         info!("Parsing {path}...");
         let mut ret = Vec::new();
         let file = File::open(path).unwrap();
         let mut rdr = Reader::from_reader(file);
 
-        for (idx, result) in rdr.deserialize::<Transaction>().enumerate() {
-            println!("{idx}");
+        for result in rdr.deserialize::<Transaction>() {
             let tx: Transaction = result.unwrap();
-            println!("{tx:#?}");
             ret.push(tx.into());
         }
 
diff --git a/src/stat/date.rs b/src/stat/date.rs
new file mode 100644
index 0000000..e3520d0
--- /dev/null
+++ b/src/stat/date.rs
@@ -0,0 +1,64 @@
+use crate::{classifier::Category, Overview, Transaction};
+use chrono::Datelike;
+use std::collections::HashMap;
+
+impl Overview {
+    pub fn by_month(&self) {
+        let min_date = self.get_first_transaction().details.date;
+        let max_date = self.get_last_transaction().details.date;
+        let mut min_date = min_date.with_day(1).unwrap();
+
+        while min_date < max_date {
+            let month = min_date.format("%Y-%m").to_string();
+            print!("{month}: ");
+            let txs = self.get_expenses_for_month(&month);
+            print!("{} txs, ", txs.len());
+            let sum: i64 = txs.iter().map(|t| t.details.amount_in_cent).sum::<i64>() / 100;
+            println!("{sum} €");
+            for (cat, amount) in self.get_top_5_cats_for_month(&month) {
+                println!("  - {cat:?} ({})", amount / 100);
+            }
+
+            println!();
+            min_date = min_date + chrono::Months::new(1);
+        }
+    }
+
+    fn get_top_5_cats_for_month(&self, month: &str) -> Vec<(Category, i64)> {
+        let mut ret = HashMap::new();
+        let txs = self.get_expenses_for_month(month);
+        for tx in txs {
+            if let Some(c) = ret.get_mut(&tx.cat) {
+                *c += tx.details.amount_in_cent;
+            } else {
+                ret.insert(tx.cat.clone(), tx.details.amount_in_cent);
+            }
+        }
+
+        let mut ret = ret.into_iter().collect::<Vec<(Category, i64)>>();
+        ret.sort_by_key(|(_, amount)| *amount);
+        ret.into_iter().rev().take(5).collect()
+    }
+
+    fn get_expenses_for_month(&self, month: &str) -> Vec<&Transaction> {
+        self.transactions
+            .iter()
+            .filter(|t| {
+                t.details.date.format("%Y-%m").to_string() == month && t.cat != Category::Transfer
+            })
+            .collect()
+    }
+
+    fn get_first_transaction(&self) -> &Transaction {
+        self.transactions
+            .iter()
+            .min_by_key(|t| t.details.date)
+            .unwrap()
+    }
+    fn get_last_transaction(&self) -> &Transaction {
+        self.transactions
+            .iter()
+            .max_by_key(|t| t.details.date)
+            .unwrap()
+    }
+}
diff --git a/src/stat/mod.rs b/src/stat/mod.rs
new file mode 100644
index 0000000..1cce2a3
--- /dev/null
+++ b/src/stat/mod.rs
@@ -0,0 +1 @@
+pub mod date;