diff --git a/src/main/java/com/booleanuk/core/Account.java b/src/main/java/com/booleanuk/core/Account.java
new file mode 100644
index 000000000..c99db0c25
--- /dev/null
+++ b/src/main/java/com/booleanuk/core/Account.java
@@ -0,0 +1,60 @@
+package com.booleanuk.core;
+
+
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class Account {
+    protected List<Transaction> transactions = new ArrayList<>();
+    protected float balance = 0;
+    protected String name;
+    protected long accountNumber;
+
+    public List<Transaction> getTransactions() {
+        return transactions;
+    }
+
+    public float getBalance() {
+        return balance;
+    }
+
+    public boolean deposit(float amount){
+        if (amount > 0){
+            transactions.add(new Transaction(amount));
+            balance += amount;
+            return true;
+        }
+        return false;
+    }
+
+    public boolean withdraw(float amount){
+        if (amount > 0 && balance >= amount){
+            transactions.add(new Transaction(-amount));
+            balance -= amount;
+            return true;
+        }
+        return false;
+    }
+
+    public String generateStatements(){
+        StringBuilder str = new StringBuilder();
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
+        str.append(String.format("%1$-10s || %2$-10s || %3$-10s || %4$-10s\n", "date", "credit", "debit", "balance"));
+        float balance = 0;
+        List<String> rows = new ArrayList<>();
+        for (Transaction trs: transactions){
+            balance += trs.getDelta();
+            if(trs.getDelta() > 0){
+                rows.add(String.format("%1$-10s || %2$-10s || %3$-10s || %4$-10s\n", trs.getTimeStamp().format(formatter), trs.getDelta(), "", balance));
+            }
+            else {
+                rows.add(String.format("%1$-10s || %2$-10s || %3$-10s || %4$-10s\n", trs.getTimeStamp().format(formatter), "", Math.abs(trs.getDelta()), balance));
+            }
+        }
+        for (String row: rows.reversed()){
+            str.append(row);
+        }
+        return str.toString();
+    }
+}
diff --git a/src/main/java/com/booleanuk/core/CurrentAccount.java b/src/main/java/com/booleanuk/core/CurrentAccount.java
new file mode 100644
index 000000000..8e0690006
--- /dev/null
+++ b/src/main/java/com/booleanuk/core/CurrentAccount.java
@@ -0,0 +1,5 @@
+package com.booleanuk.core;
+
+public class CurrentAccount extends Account{
+
+}
diff --git a/src/main/java/com/booleanuk/core/SavingsAccount.java b/src/main/java/com/booleanuk/core/SavingsAccount.java
new file mode 100644
index 000000000..6d83ab8b4
--- /dev/null
+++ b/src/main/java/com/booleanuk/core/SavingsAccount.java
@@ -0,0 +1,4 @@
+package com.booleanuk.core;
+
+public class SavingsAccount extends Account{
+}
diff --git a/src/main/java/com/booleanuk/core/Transaction.java b/src/main/java/com/booleanuk/core/Transaction.java
new file mode 100644
index 000000000..3e9af5716
--- /dev/null
+++ b/src/main/java/com/booleanuk/core/Transaction.java
@@ -0,0 +1,21 @@
+package com.booleanuk.core;
+
+import java.time.LocalDateTime;
+
+public class Transaction {
+    private final float delta;
+    private final LocalDateTime timeStamp;
+
+    public Transaction(float delta) {
+        this.delta = delta;
+        this.timeStamp = LocalDateTime.now();
+    }
+
+    public float getDelta() {
+        return delta;
+    }
+
+    public LocalDateTime getTimeStamp() {
+        return timeStamp;
+    }
+}
diff --git a/src/main/java/com/booleanuk/core/User.java b/src/main/java/com/booleanuk/core/User.java
new file mode 100644
index 000000000..ab750439e
--- /dev/null
+++ b/src/main/java/com/booleanuk/core/User.java
@@ -0,0 +1,20 @@
+package com.booleanuk.core;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class User {
+    private List<Account> accounts = new ArrayList<>();
+
+    public void addAccount(Account account){
+        accounts.add(account);
+    }
+
+    public List<Account> getAccounts() {
+        return accounts;
+    }
+
+    public void printBankStatements(Account account){
+        System.out.println(account.generateStatements());
+    }
+}
diff --git a/src/main/java/com/booleanuk/core/class-diagram.png b/src/main/java/com/booleanuk/core/class-diagram.png
new file mode 100644
index 000000000..4032cfc97
Binary files /dev/null and b/src/main/java/com/booleanuk/core/class-diagram.png differ
diff --git a/src/main/java/com/booleanuk/core/domain-model.md b/src/main/java/com/booleanuk/core/domain-model.md
new file mode 100644
index 000000000..8e92bfb82
--- /dev/null
+++ b/src/main/java/com/booleanuk/core/domain-model.md
@@ -0,0 +1,15 @@
+| Class            | Member                          | Method                       | Scenario                       | Output             |
+|------------------|---------------------------------|------------------------------|--------------------------------|--------------------|
+| User             | List<Account> accounts          | addAccount(Account account)  |                                |                    | 
+| Abstract Account | List<Transactions> transactions | getBalance()                 |                                | float balance      | 
+|                  | float balance                   | getTransactions()            |                                | List<Transactions> | 
+|                  | int accountNumber               | deposit(float amount)        | deposit was successfully done  | true               |
+|                  |                                 | withdraw(float float amount) | withdrawal was successful      | true               |
+|                  |                                 | generateStatements()         |                                |                    |
+| CurrentAccount   |                                 |                              |                                |                    | 
+| SavingAccount    |                                 |                              |                                |                    | 
+| Transaction      | float delta                     |                              |                                |                    | 
+|                  | String timeStamp                |                              |                                |                    | 
+|                  |                                 |                              |                                |                    | 
+|                  |                                 |                              |                                |                    | 
+|                  |                                 |                              |                                |                    | 
diff --git a/src/main/java/com/booleanuk/extension/.gitkeep b/src/main/java/com/booleanuk/extension/.gitkeep
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/main/java/com/booleanuk/extension/Account.java b/src/main/java/com/booleanuk/extension/Account.java
new file mode 100644
index 000000000..19e0fb1b9
--- /dev/null
+++ b/src/main/java/com/booleanuk/extension/Account.java
@@ -0,0 +1,65 @@
+package com.booleanuk.extension;
+
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class Account {
+    protected List<Transaction> transactions = new ArrayList<>();
+    protected String name;
+    protected long accountNumber;
+
+
+    public Account(String name) {
+        this.name = name;
+    }
+
+    public List<Transaction> getTransactions() {
+        return transactions;
+    }
+
+    public float getBalance() {
+        float balance = 0;
+        for (Transaction trs : transactions){
+            balance += trs.getDelta();
+        }
+        return balance;
+    }
+
+    public boolean deposit(float amount){
+        if (amount > 0){
+            transactions.add(new Transaction(amount));
+            return true;
+        }
+        return false;
+    }
+
+    public boolean withdraw(float amount){
+        if (amount > 0 && getBalance() >= amount){
+            transactions.add(new Transaction(-amount));
+            return true;
+        }
+        return false;
+    }
+
+    public String generateStatements(){
+        StringBuilder str = new StringBuilder();
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
+        str.append(String.format("%1$-10s || %2$-10s || %3$-10s || %4$-10s\n", "date", "credit", "debit", "balance"));
+        float balance = 0;
+        List<String> rows = new ArrayList<>();
+        for (Transaction trs: transactions){
+            balance += trs.getDelta();
+            if(trs.getDelta() > 0){
+                rows.add(String.format("%1$-10s || %2$-10s || %3$-10s || %4$-10s\n", trs.getTimeStamp().format(formatter), trs.getDelta(), "", balance));
+            }
+            else {
+                rows.add(String.format("%1$-10s || %2$-10s || %3$-10s || %4$-10s\n", trs.getTimeStamp().format(formatter), "", Math.abs(trs.getDelta()), balance));
+            }
+        }
+        for (String row: rows.reversed()){
+            str.append(row);
+        }
+        return str.toString();
+    }
+}
diff --git a/src/main/java/com/booleanuk/extension/Branch.java b/src/main/java/com/booleanuk/extension/Branch.java
new file mode 100644
index 000000000..590ad9769
--- /dev/null
+++ b/src/main/java/com/booleanuk/extension/Branch.java
@@ -0,0 +1,31 @@
+package com.booleanuk.extension;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Branch {
+    private final List<OverdraftRequest> requests = new ArrayList<>();
+    private final List<Account> accounts = new ArrayList<>();
+
+    public void approveRequest(OverdraftRequest request){
+        request.approve();
+        requests.remove(request);
+    }
+
+    public void denyRequest(OverdraftRequest request){
+        request.deny();
+        requests.remove(request);
+    }
+
+    public List<OverdraftRequest> getRequests() {
+        return requests;
+    }
+
+    public void requestOverDraft(float amount, String reason, CurrentAccount account){
+        requests.add(new OverdraftRequest(amount, reason, account));
+    }
+
+    public void addAccount(Account account){
+        accounts.add(account);
+    }
+}
diff --git a/src/main/java/com/booleanuk/extension/CurrentAccount.java b/src/main/java/com/booleanuk/extension/CurrentAccount.java
new file mode 100644
index 000000000..4d72d6a3b
--- /dev/null
+++ b/src/main/java/com/booleanuk/extension/CurrentAccount.java
@@ -0,0 +1,22 @@
+package com.booleanuk.extension;
+
+public class CurrentAccount extends Account {
+    protected float approvedOverdraw = 0;
+
+    public CurrentAccount(String name) {
+        super(name);
+    }
+
+    public void setApprovedOverdraw(float approvedOverdraw) {
+        this.approvedOverdraw = approvedOverdraw;
+    }
+
+    @Override
+    public boolean withdraw(float amount){
+        if (amount > 0 && getBalance() + approvedOverdraw >= amount){
+            transactions.add(new Transaction(-amount));
+            return true;
+        }
+        return false;
+    }
+}
diff --git a/src/main/java/com/booleanuk/extension/OverdraftRequest.java b/src/main/java/com/booleanuk/extension/OverdraftRequest.java
new file mode 100644
index 000000000..03921305f
--- /dev/null
+++ b/src/main/java/com/booleanuk/extension/OverdraftRequest.java
@@ -0,0 +1,25 @@
+package com.booleanuk.extension;
+
+public class OverdraftRequest {
+    private float amount;
+    private String reason;
+    private CurrentAccount account;
+
+    public OverdraftRequest(float amount, String reason, CurrentAccount account) {
+        this.amount = amount;
+        this.reason = reason;
+        this.account = account;
+    }
+
+    public void approve(){
+        account.setApprovedOverdraw(amount);
+    }
+
+    public void deny(){
+        // probably send a message or notify accountholder someway
+    }
+
+    public String getReason() {
+        return reason;
+    }
+}
diff --git a/src/main/java/com/booleanuk/extension/SavingsAccount.java b/src/main/java/com/booleanuk/extension/SavingsAccount.java
new file mode 100644
index 000000000..e333f6511
--- /dev/null
+++ b/src/main/java/com/booleanuk/extension/SavingsAccount.java
@@ -0,0 +1,8 @@
+package com.booleanuk.extension;
+
+public class SavingsAccount extends Account {
+    public SavingsAccount(String name) {
+        super(name);
+    }
+}
+
diff --git a/src/main/java/com/booleanuk/extension/Transaction.java b/src/main/java/com/booleanuk/extension/Transaction.java
new file mode 100644
index 000000000..7e27772a0
--- /dev/null
+++ b/src/main/java/com/booleanuk/extension/Transaction.java
@@ -0,0 +1,21 @@
+package com.booleanuk.extension;
+
+import java.time.LocalDateTime;
+
+public class Transaction {
+    private final float delta;
+    private final LocalDateTime timeStamp;
+
+    public Transaction(float delta) {
+        this.delta = delta;
+        this.timeStamp = LocalDateTime.now();
+    }
+
+    public float getDelta() {
+        return delta;
+    }
+
+    public LocalDateTime getTimeStamp() {
+        return timeStamp;
+    }
+}
diff --git a/src/main/java/com/booleanuk/extension/User.java b/src/main/java/com/booleanuk/extension/User.java
new file mode 100644
index 000000000..d0decaec2
--- /dev/null
+++ b/src/main/java/com/booleanuk/extension/User.java
@@ -0,0 +1,20 @@
+package com.booleanuk.extension;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class User {
+    private List<Account> accounts = new ArrayList<>();
+
+    public void addAccount(Account account){
+        accounts.add(account);
+    }
+
+    public List<Account> getAccounts() {
+        return accounts;
+    }
+
+    public void printBankStatements(Account account){
+        System.out.println(account.generateStatements());
+    }
+}
diff --git a/src/main/java/com/booleanuk/extension/class-diagram-ext.png b/src/main/java/com/booleanuk/extension/class-diagram-ext.png
new file mode 100644
index 000000000..6e882bdcb
Binary files /dev/null and b/src/main/java/com/booleanuk/extension/class-diagram-ext.png differ
diff --git a/src/main/java/com/booleanuk/extension/domain-model.md b/src/main/java/com/booleanuk/extension/domain-model.md
new file mode 100644
index 000000000..699095370
--- /dev/null
+++ b/src/main/java/com/booleanuk/extension/domain-model.md
@@ -0,0 +1,18 @@
+| Class            | Member                          | Method                                        | Scenario                       | Output             |
+|------------------|---------------------------------|-----------------------------------------------|--------------------------------|--------------------|
+| User             | List<Account> accounts          | addAccount(Account account)                   |                                |                    | 
+| Abstract Account | List<Transactions> transactions | getBalance()                                  |                                | float balance      | 
+|                  | Branch branch                   | getTransactions()                             |                                | List<Transactions> | 
+|                  | float ApprovedOverdraw          | deposit(float amount)                         | deposit was successfully done  | true               |
+|                  |                                 | withdraw(float float amount)                  | withdrawal was successful      | true               |
+|                  |                                 | requestOverDraft(float amount, String reason) |                                |                    | 
+|                  |                                 | generateStatements()                          |                                | String             | 
+| CurrentAccount   |                                 |                                               |                                |                    | 
+| SavingAccount    |                                 |                                               |                                |                    | 
+| Transaction      | float delta                     |                                               |                                |                    | 
+|                  | String timeStamp                |                                               |                                |                    | 
+| Branch           | List<OverdraftRequest> requests | approveRequest(request)                       |                                |                    | 
+|                  |                                 | denyRequest(request)                          |                                |                    | 
+| OverdraftRequest | float Amount                    |                                               |                                |                    | 
+|                  | String Reason                   |                                               |                                |                    | 
+|                  | Account account                 |                                               |                                |                    | 
diff --git a/src/test/java/com/booleanuk/core/TestBank.java b/src/test/java/com/booleanuk/core/TestBank.java
new file mode 100644
index 000000000..1dc47ad30
--- /dev/null
+++ b/src/test/java/com/booleanuk/core/TestBank.java
@@ -0,0 +1,38 @@
+package com.booleanuk.core;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.text.SimpleDateFormat;
+
+public class TestBank {
+    @Test
+    public void testCreatingAccount(){
+        User user = new User();
+        user.addAccount(new CurrentAccount());
+        user.addAccount(new SavingsAccount());
+        Assertions.assertEquals(2, user.getAccounts().size());
+    }
+
+    @Test
+    public void testDepositandWithdraw(){
+        Account account = new CurrentAccount();
+        Assertions.assertFalse(account.withdraw(700f));
+        Assertions.assertTrue(account.deposit(500f));
+        Assertions.assertTrue(account.withdraw(250f));
+        Assertions.assertEquals(250f, account.getBalance());
+    }
+
+    @Test
+    public void testPrintBankstatement(){
+        Account account = new CurrentAccount();
+        Assertions.assertTrue(account.deposit(500f));
+        Assertions.assertTrue(account.withdraw(250f));
+        Assertions.assertEquals(250f, account.getBalance());
+        System.out.println(account.generateStatements());
+        String date = new SimpleDateFormat("dd/MM/yyyy").format(new java.util.Date());
+        Assertions.assertEquals("date       || credit     || debit      || balance   \n" +
+                date + " ||            || 250.0      || 250.0     \n" +
+                date + " || 500.0      ||            || 500.0     \n", account.generateStatements());
+    }
+}
diff --git a/src/test/java/com/booleanuk/extension/.gitkeep b/src/test/java/com/booleanuk/extension/.gitkeep
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/test/java/com/booleanuk/extension/TestBankExt.java b/src/test/java/com/booleanuk/extension/TestBankExt.java
new file mode 100644
index 000000000..8d3ba5e7b
--- /dev/null
+++ b/src/test/java/com/booleanuk/extension/TestBankExt.java
@@ -0,0 +1,33 @@
+package com.booleanuk.extension;
+
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class TestBankExt {
+    @Test
+    public void testDenyOverdraft(){
+        Branch branch = new Branch();
+        CurrentAccount account = new CurrentAccount("Main account");
+        branch.addAccount(account);
+        branch.requestOverDraft(10000f, "Need money for luxury car", account);
+        Assertions.assertEquals(1, branch.getRequests().size());
+        branch.denyRequest(branch.getRequests().getFirst());
+        Assertions.assertEquals(0, branch.getRequests().size());
+        Assertions.assertFalse(account.withdraw(100f));
+        Assertions.assertEquals(0, account.getBalance());
+    }
+
+    @Test
+    public void testApproveOverdraft(){
+        Branch branch = new Branch();
+        CurrentAccount account = new CurrentAccount("Main account");
+        branch.addAccount(account);
+        branch.requestOverDraft(1000f, "Need money for rent", account);
+        Assertions.assertEquals(1, branch.getRequests().size());
+        branch.approveRequest(branch.getRequests().getFirst());
+        Assertions.assertEquals(0, branch.getRequests().size());
+        Assertions.assertTrue(account.withdraw(100f));
+        Assertions.assertEquals(-100f, account.getBalance());
+    }
+}