What a profit and loss account actually is

A profit and loss account (also called a P&L statement or income statement) is a record of money that came in and money that went out over a set period—usually a month, quarter, or year. It shows whether you made money or lost money by subtracting your expenses from your revenue. Unlike a balance sheet, which is a snapshot of what you own and owe at one moment, a P&L account is a moving picture of activity over time.

You build one by gathering your actual bank records, sorting transactions into categories, and doing basic arithmetic. The result tells you whether your business, freelance work, rental property, or other income-generating activity is profitable. Banks and accountants use P&L accounts to understand cash flow. Lenders use them to decide whether to give you money. You use them to know whether to keep doing what you are doing.

This guide walks you through the mechanics of building one yourself from the documents you already have—your bank statements, receipts, and transaction history. If you are doing this for tax purposes or a loan process, you will likely need an accountant to review it, but understanding how the pieces fit together means you can spot errors and ask better questions.

Key Takeaways

  • A profit and loss account requires three months to one year of bank statements and receipts, depending on what you are measuring and who is asking for it.
  • Revenue goes at the top; expenses are sorted into categories below it; the difference between them is your profit or loss.
  • You need to separate business transactions from personal ones, which means knowing what counts as an expense and what does not.
  • The format matters when you are submitting to a lender or tax authority—they expect specific line items in a specific order.
  • Most errors come from including personal spending, forgetting to categorize something, or using the wrong time period.

Gather your source documents first

Before you write anything down, collect every piece of paper or digital record that shows money moving in or out. This means your bank statements for the period you are covering (usually 12 months for a full year, or three months if you are just starting out), credit card statements if you use business cards, receipts for cash purchases, and any invoices you sent to customers or clients.

read your bank statements as PDFs or CSV files if your bank offers them. CSV files are easier to work with because you can open them in a spreadsheet and sort them. If you have been using accounting software like QuickBooks or Wave, you can export transaction lists directly. The goal is to have every transaction in one place where you can see the date, the amount, and what it was for.

If you are missing statements or receipts, contact your bank or credit card company. Most will send you copies going back seven years. Do not guess at amounts or categories—missing data is better than wrong data, because you can note it as incomplete rather than presenting a false number.

Separate business revenue from everything else

Revenue is money that came in because of your business or income-generating activity. If you run a consulting firm, it is what clients paid you. If you rent out a property, it is the rent tenants paid. If you sell products, it is what customers paid for those products. Money that came in for other reasons—a loan, a gift, a tax refund, money you transferred from savings—does not go on the P&L account because it is not profit from your activity.

Go through your bank statements and identify every deposit that is actually revenue. Write down the date, the amount, and who paid it. If you have multiple revenue streams (for example, consulting income and product sales), create a separate line for each one. This matters because lenders and tax authorities want to see where your money comes from.

If a customer paid you in cash and you deposited it, the deposit is your revenue. If a customer paid you by check, the check amount is your revenue. If you invoiced someone and they have not paid yet, that invoice does not go on this P&L account—only money that actually arrived in your account counts. (There is a different accounting method called accrual accounting that counts invoices you have sent but not received, but that is more complex and usually only used by larger businesses.)

List and categorize your business expenses

Expenses are money you spent to run your business or generate that revenue. Office supplies, equipment, rent for a workspace, software subscriptions, insurance, vehicle costs if you use a car for business, contractor payments, and advertising all count. Personal expenses do not—groceries for your home, your car payment if you use the car for personal reasons, your mortgage, your phone bill if it is personal—even if you sometimes use them for work.

The line between business and personal is often blurry. If you have a home office and use one room exclusively for work, a portion of your rent or mortgage can count as a business expense. If you use your phone for both business and personal calls, you might allocate 50 percent of the bill to business. The key is being consistent and honest about the split. Write down your reasoning so you can explain it later if someone asks.

Create categories for your expenses. Common ones are: salaries and wages, rent or lease, utilities, office supplies, equipment and tools, software and subscriptions, insurance, marketing and advertising, vehicle and travel, professional services (accountants, lawyers), and miscellaneous. Go through your bank and credit card statements and assign each expense to a category. Add up the total for each category. If you have a receipt that shows what you bought, attach it or note the reference number—you will need these if you are audited or if a lender asks questions.

Calculate gross profit and operating expenses

Once you have your revenue total and your expense categories, you are ready to do the math. Start with your total revenue at the top. Subtract your cost of goods sold (COGS) if you have one—this is the direct cost of making or buying the products you sell. If you are a service business with no products, you might not have a COGS line.

The result is your gross profit. Below that, list all your operating expenses—the costs of running the business that are not directly tied to making a product. Add them all up and subtract that total from your gross profit. The result is your operating profit (also called EBIT, or earnings before interest and taxes).

If you have borrowed money and are paying interest, subtract that. If you have other income or expenses that are not part of your core business (like interest earned on a savings account), add or subtract those. The final number is your net profit or loss—the bottom line. If it is positive, you made money. If it is negative, you lost money.

Format it the way lenders and tax authorities expect

If you are building this P&L account for yourself, any clear format works. If you are submitting it to a bank, an investor, or a tax authority, the format matters. Most expect this order: revenue at the top, cost of goods sold below it, gross profit, then operating expenses broken into categories, then operating profit, then interest and other income or expenses, then net profit or loss at the bottom.

Use a spreadsheet or a straightforward table. Include the period you are covering (for example, "January 1 to December 31, 2024") at the top. Put the dollar amounts in a column on the right so they line up. Use subtotals for expense categories so someone reading it can see the breakdown. If you are submitting to a specific organization, ask them whether they have a template or a required format—many do, and using theirs saves time and reduces errors.

Round to the nearest dollar unless you are working with very small amounts. Do not include cents unless the organization specifically asks for them. If a number is zero, write zero rather than leaving it blank—blank cells can look like missing data.

Check your work against your bank balance

A useful sanity check: your net profit or loss should roughly match the change in your bank account balance over the same period. If you started the year with $10,000 in the bank and ended with $15,000, your net profit should be around $5,000 (assuming you did not move money in or out for other reasons). If the numbers do not match, you have either missed a transaction, miscategorized something, or included a non-business transaction.

Go back through your bank statements and look for transactions you did not include. Check that you did not accidentally count a transfer between your own accounts as revenue or expense. Verify that the dates on your statements match the period you said you were covering. If you still cannot find the discrepancy, note it and move on—small differences are normal, but large ones mean something is wrong.

Frequently Asked Questions

Do I need to include sales tax I collected?

Sales tax you collected from customers is not revenue—it is money you are holding on behalf of the government. When you deposit it, it goes into your business account, but you owe it to your state or local tax authority. Some accounting methods show it as a liability on the balance sheet rather than on the P&L. Ask your accountant how to handle it for your situation.

What if I paid myself a salary or took money out of the business?

If you are a sole proprietor or partner, money you take out of the business is not an expense—it is a withdrawal of profit. It does not go on the P&L account. If you are a corporation and you pay yourself a salary as an employee, that salary is an expense and goes on the P&L. The distinction matters for taxes, so clarify your business structure with an accountant.

How far back do I need to go?

For a full picture, use 12 months. For a quick snapshot or if you are just starting out, three months works. If a lender or tax authority is asking for it, they will tell you the period they want. Do not mix periods—if you are covering January through December, use those exact months, not a random 12-month span.

Should I include expenses I have not paid yet?

Not on a cash-basis P&L account, which is what most small businesses use. Only include expenses you actually paid during the period. If you received an invoice in December but did not pay it until January, it goes on next year's P&L. This is simpler and matches your bank records.

What if I made a mistake on last year's P&L?

If you are building a new one for this year, start fresh with this year's transactions. If you need to correct last year's, note the correction clearly and explain it. Do not try to hide or adjust old numbers—if a lender or tax authority reviews both years, the discrepancy will show up and look worse than admitting the error.