Minimum Cash Balance or Overdraft in Cash Book Questions

Some cash book questions look almost finished, and then one small line appears at the end:

Maintain a minimum cash balance of Rs. 2,000.

Or the opening balance itself may say:

Bank overdraft Rs. 10,000.

That is where many students slow down. The entries before this line may be simple, but the final balance suddenly feels confusing. Should cash be deposited into bank? Should cash be withdrawn from bank? Can the bank column show a credit balance? Can the cash column ever become negative?

The answer becomes simple when you stop treating these lines as extra information and start treating them as instructions about the final position of money.

Once this difference is clear, these questions become much easier to solve neatly.

First, Remember What Each Column Means

In a cash and bank column cash book, there are really two balances being watched at the same time.

Column	What it represents
Cash column	Physical cash in hand
Bank column	Money in the bank account, or overdraft if the balance is negative

The cash column follows one strict practical rule:

Cash in hand cannot be less than zero.

A business cannot pay Rs. 5,000 in physical cash if only Rs. 3,000 is available in the cash box. So a cash column should normally end with a debit balance or nil balance, not a credit balance.

The bank column is different. A bank account may show a favourable balance, or it may show an overdraft if the business has withdrawn more than the available bank balance.

This one rule removes most of the confusion.

What Minimum Cash Balance Means

Minimum cash balance means the business wants to keep a fixed amount of cash in hand after all cash receipts and cash payments are recorded.

For example, if the question says:

Maintain a minimum cash balance of Rs. 2,000.

It means the closing cash balance should be Rs. 2,000, if the business has enough cash to do that.

The business may keep this amount for small daily needs such as stationery, postage, local conveyance, or urgent payments. Any extra cash can be deposited into the bank.

If you adjust too early, the later receipts and payments will disturb the answer.

The Three Possible Situations

After recording all transactions except the final minimum balance adjustment, calculate the cash in hand.

Then compare it with the required minimum.

Cash available before final adjustment	Action needed
More than minimum	Deposit the excess into bank
Exactly equal to minimum	No final cash adjustment
Less than minimum	Withdraw the shortage from bank, if possible

This is the full decision.

The question is not asking you to guess. It is asking you to bring the cash column to the required level.

Situation 1: Cash Is More Than the Minimum

Suppose the cash column shows Rs. 13,800 before the final adjustment, and the business wants to maintain minimum cash balance of Rs. 2,000.

The extra cash is:

Rs. 13,800 - Rs. 2,000 = Rs. 11,800

So Rs. 11,800 should be deposited into the bank.

This is a contra entry because cash decreases and bank increases.

Side	Particulars	Cash column	Bank column
Debit side	Cash A/c		Rs. 11,800
Credit side	Bank A/c	Rs. 11,800

The cash column will now close with Rs. 2,000.

This is a very common mistake. The amount given is the amount to keep, not the amount to deposit.

Situation 2: Cash Is Exactly Equal to the Minimum

Suppose the cash column shows Rs. 2,000 before the final adjustment, and the required minimum cash balance is also Rs. 2,000.

There is no excess cash to deposit and no shortage to withdraw.

The closing cash balance will simply be Rs. 2,000.

In this case, do not force a contra entry just because the question mentions minimum cash balance. The target is already met.

If the balance is already correct, the best answer is to leave it alone.

Situation 3: Cash Is Less Than the Minimum

Suppose the cash column shows Rs. 1,200, but the business wants to maintain Rs. 2,000 cash in hand.

The shortage is:

Rs. 2,000 - Rs. 1,200 = Rs. 800

So the business must withdraw Rs. 800 from bank for office use, if the bank has enough balance or if overdraft is allowed.

This is also a contra entry because bank decreases and cash increases.

Side	Particulars	Cash column	Bank column
Debit side	Bank A/c	Rs. 800
Credit side	Cash A/c		Rs. 800

The cash column will now close with Rs. 2,000.

The bank column will reduce by Rs. 800. If there was not enough bank balance, it may turn into overdraft.

This is why the final adjustment belongs in a cash and bank column cash book, not only in a single cash column format.

What Bank Overdraft Means in Cash Book

Bank overdraft means the bank column has a credit balance.

In simple words, the business has used more bank money than it had available. The bank account has gone below zero.

For example:

Bank receipts	Bank payments
Rs. 20,000	Rs. 27,000

The payments are higher than receipts by Rs. 7,000.

So the bank column has an overdraft of Rs. 7,000.

In the cash book, this overdraft is shown as a balance c/d on the debit side, and then brought down as balance b/d on the credit side.

That may feel unusual at first, but it follows the same balancing logic:

If bank column has	It is shown as
Debit balance	Favourable bank balance
Credit balance	Bank overdraft

Do not put overdraft in the cash column. Cash and bank are separate columns.

Opening Overdraft in a Cash Book

Sometimes the question begins with:

Cash in hand Rs. 8,000
Bank overdraft Rs. 5,000

The opening cash balance is written on the debit side in the cash column.

The opening bank overdraft is written on the credit side in the bank column.

Opening item	Side	Column
Cash in hand	Debit side	Cash column
Bank overdraft	Credit side	Bank column

This is because cash in hand is an asset, while overdraft is an amount owed to the bank.

Read the word carefully. “Bank balance” and “bank overdraft” are not the same opening item.

How Minimum Cash Balance Can Create Overdraft

Now let us connect both ideas.

Suppose the cash column is short by Rs. 3,000, and the business wants to maintain the required minimum cash balance.

The business withdraws Rs. 3,000 from bank.

If the bank column had a favourable balance of Rs. 10,000, it will reduce to Rs. 7,000.

But if the bank column had only Rs. 1,000, withdrawing Rs. 3,000 will push the bank into overdraft of Rs. 2,000.

Bank balance before withdrawal	Withdrawal	Bank position after withdrawal
Rs. 10,000 favourable	Rs. 3,000	Rs. 7,000 favourable
Rs. 1,000 favourable	Rs. 3,000	Rs. 2,000 overdraft
Rs. 4,000 overdraft	Rs. 3,000	Rs. 7,000 overdraft

This is the part students often miss. The cash column may be brought up to the minimum, but the bank column must show the real effect of that withdrawal.

That is why both columns must be balanced carefully.

A Complete Solved Example

Let us solve a short cash and bank column question.

First, record the normal cash transactions.

Cash receipts:

Opening cash                 Rs. 6,400
Cash received from Anup      Rs. 20,000
Cash sales                   Rs. 4,000
Total cash available         Rs. 30,400

Cash payments before final adjustment:

Wages                        Rs. 7,000
Cash deposited into bank     Rs. 10,000
Stationery                   Rs. 2,500
Total cash payments          Rs. 19,500

Cash left before the final adjustment:

Rs. 30,400 - Rs. 19,500 = Rs. 10,900

Required minimum cash balance is Rs. 5,000.

So excess cash is:

Rs. 10,900 - Rs. 5,000 = Rs. 5,900

This excess cash must be deposited into the bank.

Final contra entry:

Side	Particulars	Cash	Bank
Debit side	Cash A/c		Rs. 5,900
Credit side	Bank A/c	Rs. 5,900

Now the cash column closes with Rs. 5,000.

Bank movement:

Opening bank balance         Rs. 18,000
Cash deposited on April 8    Rs. 10,000
Final deposit on April 30    Rs. 5,900
Less rent paid by cheque     Rs. 5,000
Closing bank balance         Rs. 28,900

So the final balances are:

Balance	Amount
Cash in hand	Rs. 5,000
Bank balance	Rs. 28,900

The trick was not difficult. The important part was calculating cash left before the final adjustment.

A Solved Example Where Overdraft Appears

Now let us see a case where maintaining cash creates overdraft.

Cash position before final adjustment:

Opening cash                 Rs. 2,500
Less cash expenses           Rs. 1,800
Cash left                    Rs. 700

Required cash balance:

Rs. 3,000

Cash shortage:

Rs. 3,000 - Rs. 700 = Rs. 2,300

So the business must withdraw Rs. 2,300 from bank for office use.

Bank position before this withdrawal:

Opening bank balance         Rs. 1,200
Less bank payments           Rs. 900
Bank balance before withdrawal Rs. 300

Now withdraw Rs. 2,300 from bank.

Bank balance available       Rs. 300
Withdrawal needed            Rs. 2,300
Bank overdraft created       Rs. 2,000

Final balances:

Balance	Amount
Cash in hand	Rs. 3,000
Bank overdraft	Rs. 2,000

The cash target is achieved, but the bank column now has a credit balance.

This is exactly why you must balance cash and bank separately.

Where Students Usually Lose Marks

Students usually know the basic cash book rules, but lose marks in these questions because of small reading mistakes.

Mistake	Why it is wrong	Better method
Depositing the minimum amount instead of the excess	The minimum is the amount to keep	Calculate cash left minus required cash
Adjusting minimum cash balance before recording all transactions	Later entries change cash again	Make the adjustment at the end
Letting the cash column show overdraft	Physical cash cannot be negative	Use bank withdrawal or show nil only if instructed
Forgetting that final deposit or withdrawal is contra	It affects both cash and bank	Mark C in the L.F. column
Treating opening overdraft as debit balance	Overdraft is owed to the bank	Put it on the credit side of bank column
Balancing only one column	Cash and bank are separate balances	Balance both columns independently

This keeps the logic visible and prevents side mistakes.

The Fast Exam Method

Use this method whenever the question mentions minimum cash balance.

1. Record all normal cash and bank transactions.
2. Ignore the minimum cash line until the end.
3. Find cash left before final adjustment.
4. Compare it with the required minimum.
5. If cash is more, deposit the excess into bank.
6. If cash is less, withdraw the shortage from bank.
7. Balance the cash column.
8. Balance the bank column separately.
9. If the bank column has a credit balance, label it as overdraft.

That is the cleanest way to solve these questions.

Frequently Asked Questions

What does minimum cash balance mean in a cash book question?

Minimum cash balance means the business wants to keep a fixed amount of physical cash in hand at the end. If cash is more than that amount, the excess is usually deposited into bank. If cash is less, cash may be withdrawn from bank to reach the required amount.

Do we deposit the minimum cash balance into bank?

No. The minimum cash balance is the amount to keep in the cash column. Only the excess over that minimum is deposited into bank.

When should minimum cash balance be adjusted?

Adjust it at the end, after recording all normal receipts and payments. If you adjust it before the other transactions, the later entries may change the cash balance again.

Can the cash column show overdraft?

Normally, no. Physical cash cannot be negative. The cash column should usually show a debit balance or nil balance. Overdraft belongs to the bank column.

What does bank overdraft mean in the cash book?

Bank overdraft means the bank column has a credit balance. It shows that the business has withdrawn or paid more through the bank than the favourable bank balance available.

Where is opening bank overdraft written in a cash book?

Opening bank overdraft is written on the credit side of the cash book in the bank column. When it is brought down, it remains a credit balance.

Is deposit of excess cash a contra entry?

Yes. Depositing excess cash into bank reduces cash and increases bank. Since both cash and bank columns are affected inside the cash book, it is a contra entry.

Is withdrawal from bank to maintain minimum cash a contra entry?

Yes. Withdrawing cash from bank for office use increases cash and decreases bank. It is recorded in both columns and is marked as a contra entry.

Can maintaining minimum cash balance create a bank overdraft?

Yes. If the business needs to withdraw cash from bank but the bank column does not have enough favourable balance, the bank column may become overdraft.

What is the easiest way to solve these questions?

Find the cash left before the final adjustment. Compare it with the required minimum. Deposit the excess if cash is more, withdraw the shortage if cash is less, and then balance the bank column separately.