What a profit and loss account shows you

A profit and loss account (also called a P&L or income statement) is a record of your business's money coming in and money going out over a set period — usually a month, quarter, or year. It shows whether your business made money, lost money, or broke even. Unlike a bank statement, which just lists transactions, a P&L organizes income and expenses into categories so you can see where your money actually came from and where it actually went.

The basic formula is straightforward: add up all your income, subtract all your expenses, and what's left is your profit (or loss if the number is negative). Banks, tax authorities, and anyone lending you money will want to see this account because it tells them whether your business is sustainable.

Key Takeaways

  • A profit and loss account totals your income and subtracts your expenses to show whether you made or lost money in a specific period.
  • You need three pieces of information to start: total income from all sources, a list of every expense category, and the exact dates your accounting period covers.
  • Expenses should be sorted into categories like rent, payroll, supplies, and utilities so you can see which parts of your business cost the most.
  • Your final number — profit or loss — is what you owe taxes on, so accuracy matters more than speed.

Gather your income and expense records

Before you write anything down, collect the documents that show what money came in and what went out. For income, this means invoices you sent to customers, receipts from sales, or statements from clients who paid you. For expenses, gather receipts, invoices from suppliers, bank statements showing transfers, payroll records, and utility bills — anything that shows you spent money on the business.

Sort these by date and make sure they all fall within the same time period. If you're creating a P&L for January through March, don't include an April receipt. If you're missing a receipt but you know the expense happened, write down what it was, when it happened, and how much it cost — you can note that it's reconstructed from memory, but having the information is better than guessing.

If you use a business bank account (which you should), your bank statement is your safety net. Every business expense should either appear there or be documented separately. Personal bank statements don't belong in a business P&L.

List all your income sources

Write down every way money entered your business during the period. This might be sales to customers, payments from clients, money from a second location, refunds you received, or interest your business account earned. Add them all up to get your total income.

If your business has very different types of income — for example, you sell products and also offer services — you can list them separately so you can see which one brings in more money. But at minimum, you need one total income number.

Organize your expenses into categories

This is where the P&L becomes useful. Instead of just listing every receipt, group expenses into categories. Common categories include rent or lease payments, payroll and wages, supplies and materials, utilities, insurance, equipment, marketing, professional services (like accounting or legal), and transportation. The exact categories depend on your business.

Add up all the receipts in each category. If you spent $200 on office supplies in January, $150 in February, and $180 in March, your supplies category total is $530. Do this for every category. If an expense doesn't fit anywhere, create a new category for it — but try to keep the list to 10 to 15 categories so the P&L stays readable.

Some expenses happen only once or twice a year (like annual insurance or equipment repair). Include them in the period when they actually happened, even if it makes that month look expensive. This is why looking at a full year's P&L is often more useful than looking at a single month.

Calculate your total expenses and your profit or loss

Add up all your category totals to get your total expenses. Then subtract total expenses from total income. If the number is positive, you made a profit. If it's negative, you had a loss. That's your bottom line.

Write it down clearly. Many business owners create a straightforward table that looks like this:

Total Income$15,000
Total Expenses$12,000
Profit$3,000

This number matters because it's what you'll owe income tax on (though you may be able to deduct certain things depending on your business structure and location). It also tells you whether your business is actually making money or just moving money around.

Review your P&L for mistakes and patterns

Once you have your numbers, check them. Add up your income receipts again. Add up your expense categories again. Make sure the dates are right. If a number looks wrong — like if one category is much higher than you expected — go back to the receipts and see why.

Then look for patterns. Which expense category is largest? Is that what you expected? If payroll is 70% of your expenses but you thought it was 50%, that tells you something important about where your money goes. If income dropped compared to last month, you might need to understand why.

A P&L is most useful when you create one regularly — monthly or quarterly — so you can spot trends. One month of loss might be normal; three months of loss is a signal that something needs to change.

Keep records organized for future P&Ls

Once you've created one P&L, the next one is easier if you keep your records in the same system. Many business owners use a straightforward spreadsheet with columns for date, description, category, and amount. Others use accounting software that sorts transactions automatically. A few still use a notebook and a calculator, though that gets harder as the business grows.

Whatever system you choose, use it consistently. File receipts by month. Keep bank statements. Note cash expenses in writing if they don't appear on a statement. The goal is that six months from now, when you need to create a P&L for a loan process or tax filing, you can find what you need without reconstructing everything from memory.

Frequently Asked Questions

Do I need to include personal expenses in my business P&L?

No. A business P&L shows only money that came in and went out for the business itself. Personal expenses — groceries, rent on your home, car payments — don't belong here, even if you own the business. If you took money out of the business for personal use, that's a separate transaction called a draw or distribution, not an expense.

What if I don't have a receipt for an expense?

Write down what you remember: the date, what you bought, which category it belongs in, and the amount. Note that it's from memory. For tax purposes, you may need actual receipts, so check your local tax rules. For your own records, having the information documented is better than leaving it out entirely.

Should I include money I borrowed or loaned to the business?

No. A loan is not income and repaying it is not an expense — it's a transfer of money that doesn't change whether the business is profitable. Only include money the business earned and money the business spent on operations.

How often should I create a P&L?

Monthly is ideal if you want to spot problems early. Quarterly works if your business is small and stable. At minimum, create one annually for tax purposes. The more often you look at it, the faster you'll notice if something is wrong.

Can I use a P&L to decide whether to hire someone or buy equipment?

Yes. If your P&L shows you're profitable and cash is coming in regularly, you have room to invest in hiring or equipment. If you're breaking even or losing money, adding expenses is risky. A P&L tells you what you can actually afford.