Expense account: Meaning, types, and business impact explained

What is an expense account

An expense account records what a business spends on day-to-day operations in a given accounting period. Rather than lumping all costs together, businesses split spending into categories, for example, advertising expenses (ads, brochures, flyers) or utilities expenses (electricity, water, internet). This makes it far easier to track spending, spot trends, and pull accurate reports than if everything sat in a single ledger.

Expense accounts are temporary accounts. At the end of each accounting period, the balance is transferred out (usually to retained earnings) and the account resets to zero, so the next period starts clean and expenses don't carry over or get mixed up across periods.

Expense accounts show up on the income statement (profit and loss statement), under the expenses section, where they're deducted from revenue to calculate net income.

The five account types in accounting

An expense account is one of five account types:

Expense accounts vs. income and asset accounts

It's easy to confuse these three, especially since they all appear on financial statements, but they track opposite things:

• Expense accounts reduce net income. They record money going out to run the business.
• Income accounts increase net income. They record money coming in from sales.
• Asset accounts aren't on the income statement at all. They sit on the balance sheet and track what the company owns, not what it spends or earns in a period.

A quick way to tell them apart: if a purchase gets used up or provides value during the current period (like office supplies or a month of rent), it's usually an expense. If it provides value beyond the current period (like equipment or property), it's usually an asset.

How expense accounts work

Expense accounts follow the double-entry accounting method, where every transaction affects at least two accounts, with equal debit and credit amounts.

For example, if a business purchases SGD 1,000 worth of office supplies with cash, the transaction is recorded as:

• Debit: SGD 1,000 to the office supplies or administrative expenses account, increasing the expense balance
• Credit: SGD 1,000 to the cash account, decreasing the cash balance

If the business purchases the supplies on credit instead, the entry would be:

• Debit: SGD 1,000 to the expense account
• Credit: SGD 1,000 to accounts payable, increasing the amount owed to the supplier

This is also the answer to a common question: is an expense account a debit or credit? Expenses are recorded as debits, which increase the expense account balance and decrease cash or accounts payable on the other side of the entry.

How to close an expense account

Because expense accounts are temporary, they must be closed at the end of each accounting period. Closing means transferring the account's total balance to the income summary account (or directly to retained earnings, depending on the accounting system), then resetting the expense account to zero.

This closing entry is recorded as:

• A credit to the expense account (reducing its balance to zero)
• A debit to the income summary account (capturing all expenses for the period)

The income summary is then closed to retained earnings, completing the cycle. Most accounting software handles this automatically at period-end, but understanding the mechanics helps when reviewing or auditing financial records.

Main expense categories on the income statement

Businesses commonly classify expenses on the income statement into three broad categories and then break them down into more specific sub-accounts

Tracking COGS accurately matters for pricing products correctly and protecting margins. Tracking OpEx helps businesses identify unnecessary spending, forecast future costs, and manage cash flow.

Two other distinctions are also useful when analysing expenses:

Fixed vs. variable expenses

Fixed expenses stay the same each period regardless of output (rent, insurance, salaried payroll). Variable expenses fluctuate with business activity (raw materials, shipping costs, sales commissions). Separating these makes forecasting more accurate and helps identify where costs can be trimmed during slow periods.

Deductible vs. non-deductible expenses

For Singapore tax purposes, accounting expenses and tax-deductible expenses aren't always the same. The Inland Revenue Authority of Singapore (IRAS) generally allows revenue expenses that are incurred wholly and exclusively in producing income and aren't specifically prohibited from deduction. Capital and private expenses are generally not deductible, although separate tax treatments, such as capital allowances, may apply to qualifying capital expenditure.

Correctly categorising expenses from the start makes it easier to identify potentially deductible costs and make the appropriate tax adjustments when preparing tax returns.

Common expense sub-categories

Within these three broad groups, most companies maintain more specific sub-accounts:

Expense account examples

To see how expense accounts work in practice, here are common examples across different business types:

Note that depreciation is an expense recognised in the financial statements without a corresponding cash outflow in the current period. It allocates the cost of a long-term asset across its useful life, reducing accounting profit. For Singapore tax purposes, accounting depreciation itself is generally not deductible. Businesses may instead claim capital allowances for qualifying fixed assets, subject to the applicable rules.

Employee expense accounts and claims

Employee-related expense accounts record costs such as salaries, training, benefits, and business travel. Employee expense claims are different: they are the process used to reimburse employees who pay approved business costs out of pocket.

The reimbursement cycle for employee expenses typically works like this:

• Employee incurs a business expense, such as a client dinner, flight, or software licence, and keeps the receipt.
• Employee submits an expense report through the company's expense management system, attaches the receipt, and selects the relevant expense category.
• A manager or finance approver reviews the claim against company policy and either approves it or flags it for clarification.
• Once approved, finance processes the reimbursement through a bank transfer or payroll and codes the expense to the appropriate account.

Many businesses issue corporate cards to employees instead of or alongside a reimbursement process. Cards can be configured with spending limits and merchant restrictions to help keep purchases within company policy and reduce the administrative burden of reviewing routine transactions. However, controls do not eliminate the need for review, and transactions may still require verification or correction before they are posted to the appropriate accounting account.

Aspire's corporate cards can be used as part of this workflow, giving businesses greater visibility and control over employee spending.

Benefits of expense accounts

Organising expenses into clear categories gives businesses:

• Better financial visibility: Organises diverse business expenses into clear categories, making it easier to track spending accurately.
• Better spending control: Helps businesses reduce unnecessary spending, stay within budget limits, and identify cost-saving opportunities by analysing spending patterns.
• Improved financial forecasting: Provides reliable spending data that supports more accurate financial forecasts and informed business decisions.
• Tax compliance and savings: Accurate expense categorisation and tracking help businesses identify eligible tax-deductible expenses, claim deductions, and maximise applicable tax savings.
• Better record-keeping: Well-organised expense accounts make it easier to maintain accurate records and respond to potential tax audits.
• Accurate financial reporting: Consistent categorisation and documentation produce reliable financial statements that give stakeholders a clearer view of the business's financial performance and position.
• Accounting and regulatory compliance: Proper expense records help businesses meet accounting standards and regulatory requirements more effectively.

How to categorise and manage expense accounts

Businesses in Singapore are legally required to maintain proper expense accounts and other financial records for at least 5 years. Failure to comply can result in additional tax assessments by the Inland Revenue Authority of Singapore (IRAS) as well as penalties. Given these requirements, effective expense categorisation and management is essential for ensuring compliance. Here's how to do it:

1. Build a chart of accounts (COA)

A chart of accounts is the full list of expense accounts your business uses. Start broad, then break categories down. For example, an "operating expenses" category might contain sub-accounts for marketing, insurance, professional fees, and utilities.

Keep names clear and consistent, and consider assigning numerical codes to each category. Codes make accounts easier to process in accounting software and easier to group logically as your chart of accounts grows.

2. Set clear rules for applying and classifying expenses

The most common source of messy books is inconsistent classification. One employee logs a client’s dinner under "entertainment," while another logs the same type of expense under "travel." To avoid this, define the rules upfront:

• Write a specific definition for each expense category, with examples of what does and doesn't belong in it.
• Apply those definitions consistently across every team and transaction.
• Review and reclassify miscoded transactions during monthly reconciliation rather than waiting until year-end.
• Update the chart of accounts and classification rules when the business adds new types of spending.

3. Set spending limits and approval workflows

Spending limits and approval workflows are part of an expense policy rather than the chart of accounts itself. Define who can approve different types and amounts of spending, and set limits that reflect employees' actual responsibilities.

Tiered approval thresholds can provide additional oversight for higher-value expenses, while clear documentation requirements make it easier for finance teams to verify and classify transactions.

4. Put a written expense policy in place

A clear expense policy defines how expenses should be categorised, submitted, documented, and approved. It should specify eligible expenses, spending limits, required supporting documents, approval responsibilities, and the process for handling exceptions.

Separating these policy rules from the chart of accounts makes both easier to maintain and apply consistently.

Expense account best practices

Managing expense accounts effectively requires consistent accounting practices and reliable transaction records. These best practices can help:

• Reconcile regularly: Compare expense records with bank statements, corporate card statements, and other transaction sources monthly or quarterly to identify errors, duplicate entries, missing receipts, or unusual transactions.
• Use consistent account categories: Keep expense categories clearly defined and apply them consistently across transactions and reporting periods.
• Retain source documentation: Keep receipts, invoices, bills, and other supporting documents required to substantiate recorded expenses.
• Avoid excessive miscellaneous accounts: Create specific accounts where they provide useful reporting value, but avoid creating unnecessary categories that make the chart of accounts difficult to maintain.
• Review the chart of accounts as the business changes: Add, consolidate, or rename accounts when the company's products, operations, or spending patterns change.
• Connect transaction sources to accounting software: Integrating relevant bank and card transactions with accounting software can reduce manual data entry and make reconciliation more efficient.

Keep expense data ready for the close with Aspire

Expense accounts are only as reliable as the transaction data feeding them. When business spending is spread across bank accounts, employee reimbursements, and corporate cards, finance teams can spend significant time collecting receipts, reviewing transactions, and preparing records for reconciliation.

Aspire offers multi-currency business accounts and corporate cards, along with a dedicated expense management (https://aspireapp.com/expense-management) platform. Businesses can use these tools to centralise expense data, capture receipts, set budgets and spending policies, and manage approval workflows.

Aspire also integrates with accounting platforms, helping businesses transfer relevant transaction data into their accounting workflows. This can reduce manual data entry and give finance teams better visibility into business spending before the books are closed.