How To Prepare An Income Statement (Step-by-Step Guide & Helpful Tips)

If you need to know how to prepare an income statement, the process is straightforward: gather your revenue, list your expenses, and subtract those expenses from revenue to find net income or net loss. An income statement shows whether a business made money over a specific period, such as a month, quarter, or year.

This guide walks you through the steps, explains the key parts of the statement, and gives practical tips so you can build one accurately. The examples are educational and may need to be adjusted for your country, accounting method, or business structure.

How To Prepare An Income Statement

To prepare an income statement, choose the reporting period, record all revenue earned during that period, list the related expenses, and calculate the difference. The basic formula is: Revenue – Expenses = Net Income. If expenses are greater than revenue, the result is a net loss.

What an income statement shows

An income statement, sometimes called a profit and loss statement or P&L, summarizes financial performance over time. It does not show cash in the bank at a single moment; that is the job of a balance sheet or cash flow statement. Instead, it answers a simple question: did the business earn more than it spent during the period?

Why it matters

Helps owners see if the business is profitable
Supports budgeting and cost control
Gives lenders, investors, and managers a snapshot of performance
Helps identify trends in sales, margins, and operating costs

Step 1: Choose the reporting period

Start by deciding the time frame you want to measure. Common periods include a month, quarter, or year. The period should be consistent so you can compare results over time. For example, a small business might prepare monthly income statements to track short-term performance and an annual statement for tax or planning purposes.

Keep the period consistent

If you compare one month to another, use the same length of time each month when possible. A 30-day period and a 31-day period can differ slightly, which may affect sales or expense totals.

Step 2: Gather revenue information

Revenue is the money earned from selling goods or services before subtracting expenses. Use the revenue figure that matches your accounting method. Under accrual accounting, revenue is recorded when it is earned, not necessarily when cash is received. Under cash accounting, revenue is recorded when cash is collected.

Common revenue categories

Sales of products
Service income
Subscription income
Interest or other operating income, if applicable

Be careful not to mix gross revenue with net revenue. Gross revenue is the total amount billed or earned before deductions. Net revenue may exclude returns, discounts, or allowances, depending on how your business reports income.

Step 3: List the cost of goods sold, if applicable

If your business sells products, you may need to calculate cost of goods sold, often abbreviated as COGS. This includes direct costs tied to producing or purchasing the items sold during the period. Service businesses may not have COGS in the same way, though they may still have direct delivery costs.

COGS typically includes

Raw materials
Inventory purchased for resale
Direct labor tied to production
Shipping or freight on purchased inventory, if treated as part of inventory cost

Subtracting COGS from revenue gives gross profit. The formula is:

Gross Profit = Revenue – Cost of Goods Sold

Step 4: Record operating expenses

Operating expenses are the costs of running the business that are not directly tied to producing the product or service. These are usually grouped into categories so the statement is easier to read and analyze.

Try to keep expenses in the correct period. For example, if an annual insurance policy covers 12 months, you may need to allocate only one month’s share to a monthly income statement under accrual accounting.

Step 5: Include other income and other expenses, if needed

Some businesses have items that do not belong in regular operating income. These may include interest income, interest expense, gains or losses from asset sales, or one-time charges. Not every business will have these items, but when they exist, they should be shown separately so the main operating results remain clear.

Why separation matters

Separating operating and non-operating items helps you understand whether the core business is healthy. A one-time gain can make results look stronger than the business’s normal operations, while a one-time loss can make performance look weaker.

Step 6: Calculate gross profit and operating income

Once revenue and expenses are listed, calculate the key subtotals. These numbers help you see where profit is being made or lost.

Gross Profit = Revenue – COGS

Operating Income = Gross Profit – Operating Expenses

Operating income is sometimes called operating profit or earnings before interest and taxes, though exact labels can vary by accounting style and country.

Step 7: Calculate net income

Net income is the final result after all expenses are included. Start with operating income, then add or subtract other income and expenses, including interest and taxes where relevant.

Net Income = Operating Income + Other Income – Other Expenses – Taxes

If the result is negative, the statement shows a net loss. That does not automatically mean the business is failing, but it does mean the business spent more than it earned during that period.

Simple example of an income statement

Here is a basic illustrative example using a monthly period and simple figures in dollars. These numbers are hypothetical and meant only to show the structure.

Revenue: $50,000
Cost of goods sold: $20,000
Gross profit: $30,000
Operating expenses: $18,000
Operating income: $12,000
Interest expense: $1,000
Taxes: $2,000
Net income: $9,000

In this example, the business earned $50,000 in revenue and ended with $9,000 in net income after all listed costs. If expenses had been higher than revenue, the final figure would have been a net loss instead.

How to format the statement

A clear income statement usually follows a simple structure. You can prepare it in a spreadsheet, accounting software, or a manual template.

Title the document with the business name and reporting period
List revenue at the top
Subtract cost of goods sold to show gross profit
List operating expenses by category
Show operating income
Add or subtract non-operating items
Show taxes, if applicable
End with net income or net loss

Example layout

Company Name
Income Statement
For the Month Ended [Date]

Revenue
Less: Cost of Goods Sold
Gross Profit
Less: Operating Expenses
Operating Income
Add/Subtract: Other Income and Expenses
Less: Taxes
Net Income

Helpful tips for accuracy

Accuracy matters because small mistakes can change the story the statement tells. A clean income statement should be consistent, easy to follow, and based on reliable records.

Use the same accounting method each period
Match expenses to the correct period
Separate direct costs from overhead where possible
Check that totals add up before finalizing the statement
Keep supporting records such as invoices, receipts, and bank statements
Review unusual spikes or drops in revenue and expenses

Watch for common mistakes

Mixing personal and business expenses
Recording revenue twice
Leaving out accrued expenses or unpaid bills
Putting one-time items into regular operating costs without explanation
Confusing cash flow with profitability

Cash basis vs. accrual basis

The method you use changes how the income statement looks. Under cash basis accounting, the statement reflects money actually received and paid. Under accrual basis accounting, it reflects income earned and expenses incurred, even if cash has not yet moved.

Neither method is universally best for every situation. Cash basis can be simpler for very small businesses, while accrual basis often gives a more accurate picture of performance over time. Tax rules and reporting requirements vary by jurisdiction, so check local guidance if the statement will be used for filing or compliance.

When to review an income statement

Many businesses review income statements monthly, but the right schedule depends on the size and complexity of the operation. Frequent reviews can help you spot problems early, such as rising costs, falling sales, or shrinking margins.

Good times to review it

At the end of each month
Before making major spending decisions
When preparing budgets or forecasts
When applying for financing or presenting results to stakeholders

Final takeaway

To prepare an income statement, collect revenue data, organize expenses, calculate gross profit and operating income, and finish with net income or net loss for the chosen period. The key is consistency: use the same accounting approach, keep records organized, and review the statement regularly so it can guide better business decisions. If you want to strengthen your financial understanding further, you may also find what a controller does and how to calculate book value helpful.