Banks, payments and account records

Reconstruct account changes and distinguish a deposit claim from a loan obligation

Paper packet. Every task here also exists on screen, where it is checked automatically; answers written on paper are not assessed by Nydus. When you are back at a device, enter your answers there.

1. What you will learn

Reconstruct account changes and distinguish a deposit claim from a loan obligation

2. Starting point

Money can be used to make payments and record prices. An account balance is a recorded amount at a particular time. A payment changes balances, so we must identify whose record is being described before adding or subtracting.

3. Words for this lesson

4. A bank account is a record of a claim

A deposit account records an amount the bank owes its customer under the account's terms. If a fictional account shows one hundred dollars, the customer has a claim of one hundred dollars against the bank. The entry is not a label on a particular envelope of banknotes stored separately for that customer. Understanding the record helps explain how payments can occur electronically without a physical note moving for every transaction.

The same relationship appears differently from each side. The deposit is an asset of the customer because it is a claim the customer holds. It is a liability of the bank because the bank owes the customer. Those descriptions are compatible. A useful question whenever a balance sheet uses the words asset or liability is: whose balance sheet is this? Reversing the viewpoint without changing the label can create a misleading conclusion.

An account can receive deposits, payments from others or other credits specified in its rules. It can be reduced by withdrawals, purchases, transfers or charges. To calculate a closing balance, start with the opening balance, add credited amounts and subtract debited amounts. Use transactions from the same account and period. A customer's cash held outside the bank is a different asset and should not be silently added to the deposit balance unless the question asks for both.

A balance is also different from a flow. One hundred dollars on Monday is a stock at a time. Twenty dollars paid into the account during the week is a flow over a period. A report can contain both, but adding Monday's balance and Friday's balance does not calculate weekly income. To explain a change, compare the balances and identify the intervening transactions.

Term	What it means
Deposit	A customer's recorded claim on a bank, usable under the account's stated rules.
Loan	An agreement in which a borrower receives funds and owes repayment under specified terms.
Asset	Something of economic value held, such as a claim to receive payment.
Liability	An obligation to another party, such as an amount owed.
Bank capital	The difference between the value of a bank's assets and its liabilities in a simplified balance sheet.
Liquidity	The ability to make required payments when they fall due.
Settlement	The completion of payment obligations between the institutions involved.

Another way: Follow a payment without counting it twice

Suppose a buyer and seller use accounts at the same fictional bank. The buyer starts with eighty dollars and the seller with twenty. A fifteen-dollar purchase reduces the buyer's deposit to sixty-five and raises the seller's to thirty-five. Their combined deposits remain one hundred. The payment transfers a claim within the bank's records; it does not create fifteen dollars of additional combined deposits merely because both accounts display an entry.

The two entries have opposite signs. The buyer's subtraction and seller's addition describe the same transaction from two viewpoints. If a class adds both as gains, it counts the payment twice. If it subtracts the payment from both accounts, it loses an amount that should have reached the seller. Checking the combined balance before and after is an independent way to catch those errors in this fee-free transfer example.

When customers use different banks, the banks also need to settle with one another. In modern systems, banks can use balances held at the central bank and other payment arrangements to complete these obligations. The customer's deposit and a commercial bank's settlement balance are different records belonging to different holders. Our introductory exercises do not treat the customer's account balance as if it were itself the bank's central-bank balance.

Payments can involve delays, fees or conditions, so a real balance record may contain more entries than a simple classroom transfer. The exercise must state whether fees are included and whether the payment has completed. If a question says there is no fee and the transfer is completed, use those conditions. Do not invent a fee or assume that an instruction to pay necessarily proves final settlement has already occurred.

Another way: A loan adds both a resource and an obligation

When a commercial bank makes a loan by crediting a borrower's account, it can create a new deposit alongside the borrower's repayment obligation. This is not simply the transfer of a particular saver’s labeled pile of money. On the bank's simplified records, the loan is an asset because the borrower owes repayment, while the new deposit is a liability because the bank owes the account holder. The two sides must be recorded together.

Suppose a borrower has a thirty-dollar deposit and no debt in the supplied starting case. A new fifty-dollar loan credited to that account raises the deposit to eighty and creates fifty dollars of debt. The difference between the deposit and the loan debt remains thirty. The borrower has greater spending power in the account, but has not received fifty dollars of debt-free wealth. Ignoring the obligation would misdescribe what borrowing changed.

Repaying principal reduces the outstanding loan obligation. In a simplified repayment from the borrower's deposit, both that deposit and the loan principal fall by the repayment amount. Interest is a separate payment for the loan arrangement, with its own accounting effect. A statement that principal repayment leaves debt at a certain level does not automatically include interest or fees unless the terms say so.

The ability to create deposits through lending does not mean banks can lend without limits. They need borrowers expected to repay, adequate capital, access to settlement funds, sound risk management and compliance with applicable institutional rules. Payments to other banks can create funding and liquidity needs. Our lesson introduces the two-sided record, not a mechanical claim that any bank can expand indefinitely or multiply one deposit into a guaranteed amount of lending.

Another way: Liquidity and losses are different problems

A bank can hold assets that are valuable but cannot immediately be turned into the payment funds it needs. If many payments or withdrawals fall due at once, that timing mismatch creates a liquidity problem. A simplified example might show a bank with claims worth more than its obligations overall, yet insufficient immediately available settlement funds for today's outflows. Total asset value and ability to pay today answer different questions.

A loss can instead reduce the value of assets. If borrowers do not repay as expected, a loan may be worth less than its recorded face amount. Bank capital provides a buffer between assets and liabilities in the simplified balance sheet. If assets are one hundred twenty dollars and liabilities one hundred, capital is twenty. A ten-dollar asset loss, with liabilities unchanged, reduces capital to ten. The loss does not vanish because the original contract stated a larger repayment amount.

Liquidity and solvency can interact, but they are not synonyms. Solvency concerns whether asset value is sufficient relative to obligations under the relevant accounting and valuation conditions. Liquidity concerns meeting payments on time. Selling assets quickly to obtain payment funds may involve a discount and create a loss. Conversely, a bank can be unable to cover its obligations even if it has enough cash for a particular small payment today.

Banks and public institutions use several arrangements to manage payment and loss risks. The details differ across places and change over time. This course does not quote a current deposit-protection limit or promise that every account has the same protection. Any actual claim about coverage needs the institution, jurisdiction, account type and current official terms. The classroom arithmetic remains useful without turning a hypothetical balance sheet into a promise about a real product.

Another way: Read services and charges as part of the arrangement

Banks can provide payment services, record keeping, safekeeping arrangements and lending. The services are connected but not identical. A debit payment normally draws on an account under its stated rules, while a credit arrangement can create a repayment obligation. The physical appearance of a card does not by itself reveal the complete contract. A statement or agreement identifies which balance changes and whether borrowing is involved.

Charges and interest affect the account's change over time. If an account begins with sixty dollars, receives twenty and pays out fifteen plus a two-dollar fee, the closing balance is sixty-three. Omitting the fee gives a different answer. Calling all credited amounts income can also be wrong: a transfer from another account owned by the same person or the credit from a new loan has a different economic meaning from earnings.

An account statement can be checked transaction by transaction and then checked as a total. Opening balance plus all inflows minus all outflows should equal the closing balance under the stated completed-entry rules. A discrepancy is a reason to locate missing, duplicated or differently timed entries, not to silently change an amount until the total looks convenient.

The lesson's goal is to understand those records and relationships, not to select a bank or recommend borrowing. Useful questions are factual and bounded: which party owns a claim, who owes repayment, which transaction changes a balance, and which assumptions make the reconciliation valid? Those questions provide a foundation for the later lessons on saving, borrowing and budgets.

5. Reconstructing a fictional club account

A fictional club starts a week with ninety dollars in its deposit account. It receives thirty dollars of member payments and transfers twenty-five dollars to a supplier at the same bank. The bank charges a stated one-dollar account fee. The closing deposit is ninety plus thirty minus twenty-five minus one, or ninety-four dollars. The supplier's deposit rises by twenty-five from the completed purchase, but that increase is not an additional twenty-five dollars in the club's own account.

The club then receives a forty-dollar loan credited to its account. Its deposit rises to one hundred thirty-four and its loan debt rises to forty. Looking only at the deposit would make it appear that the club gained forty dollars without a cost. Recording the debt shows that its deposit-minus-loan position remains ninety-four at that moment. Interest and later payments are not included because this particular step only records origination.

If the club repays ten dollars of principal from the account, its deposit becomes one hundred twenty-four and the loan balance becomes thirty. The difference remains ninety-four before any interest or fee. The repayment changes both records rather than merely erasing an obligation while leaving the spending balance untouched.

The treasurer can present three checks: reconcile the original week's inflows and outflows, record the loan as both a deposit increase and a debt increase, and record principal repayment on both sides. These checks do not determine whether the club should borrow or whether its future project will succeed. They make the current records understandable so a later decision can use accurate starting information instead of mistaking a loan for earnings.

6. A tempting mistake

A deposit is the customer's asset and the bank's liability. A loan credit increases both the borrower's account and the borrower's debt; it is not debt-free income. Liquidity concerns payment timing, while capital and solvency concern the relation between asset values and obligations.

7. A fictional account starts at 20 dollars, receives a 40-dollar loan and repays 10 dollars of principal; no other entries occur.

8. A fictional account starts at 35 dollars, receives a 60-dollar loan and repays 15 dollars of principal; no other entries occur.

9. A fictional account starts at 50 dollars, receives a 80-dollar loan and repays 25 dollars of principal; no other entries occur.

10. A fictional account starts at 30 dollars, receives a 50-dollar loan and repays 20 dollars of principal; no other entries occur.

11. Guided practice

A fictional account begins with 45 dollars and zero loan debt. A bank credits a new loan of 70 dollars, then the borrower repays 20 dollars of principal from that account. No other transactions, interest or fees occur. Enter the final deposit, final loan debt and deposit minus loan debt.

12. Guided practice

An account has 25 dollars and no debt, receives a 50-dollar loan, then repays 15 dollars of principal. No interest, fees or other entries occur.

13. Guided practice

Draw only the stated service relationships: central bank c supplies settlement services to commercial bank b; b supplies payment services to household h and business x. Do not add unstated direct relationships.

14. Practice

A fictional account begins with 65 dollars and zero loan debt. A bank credits a new loan of 90 dollars, then the borrower repays 35 dollars of principal from that account. No other transactions, interest or fees occur. Enter the final deposit, final loan debt and deposit minus loan debt.

15. Practice

A fictional account begins with 75 dollars and zero loan debt. A bank credits a new loan of 110 dollars, then the borrower repays 45 dollars of principal from that account. No other transactions, interest or fees occur. Enter the final deposit, final loan debt and deposit minus loan debt.

16. Somewhere new

A fictional club account starts at 90 dollars, receives 30 dollars of member payments, pays a supplier 25 dollars and pays a stated fee of 1 dollar. It then receives a 40-dollar loan credited to the account. Enter the final deposit, new debt and deposit minus new debt.

17. Lesson test

Lesson test: one question per skill, one attempt each, no hints. Your answers are checked when you submit.

18. Test question

A fictional account begins with 85 dollars and zero loan debt. A bank credits a new loan of 120 dollars, then the borrower repays 55 dollars of principal from that account. No other transactions, interest or fees occur. Enter the final deposit, final loan debt and deposit minus loan debt.

19. What you can do now

Explain how to reconstruct account changes and distinguish a deposit claim from a loan obligation. Show a fresh example and check its result.

Working for the steps left to you

	Your result
Deposit in dollars
Loan debt in dollars
Deposit minus debt in dollars

	Your result
Deposit in dollars
Loan debt in dollars
Deposit minus debt in dollars

	Your result
Deposit in dollars
Debt in dollars
Difference in dollars

	Your result
Deposit in dollars
Loan debt in dollars
Deposit minus debt in dollars

10. A fictional account starts at 30 dollars, receives a 50-dollar loan and repays 20 dollars of principal; no other entries occur., step 5