How to Create a Profit and Loss Statement: 9 Steps From Scratch

Step 1: Choose Your Reporting Period

Before entering a single number, decide on the time window your P&L will cover. The three standard options are monthly, quarterly, and annual. For this worked example, we are building a monthly P&L for January 2026 for a solo consulting business.

Monthly is the best starting point for businesses under $1 million in annual revenue because it gives you 12 checkpoints per year to catch problems early. A quarterly view works well once you have at least 6 months of monthly data to compare. Annual is primarily for tax filing and external reporting.

Common mistake: Mixing time periods. If you record January revenue but include an insurance bill that covers January through March, your P&L for January is overstated on expenses. Under accrual accounting, divide that $1,800 quarterly insurance bill into three $600 monthly entries.

Step 2: List All Revenue Sources

Write down every source of income from your core business operations. For our consulting example, January 2026 revenue breaks down as:

Common mistake: Including money received but not yet earned. If a client paid a $10,000 deposit in January for a project starting in February, that $10,000 is deferred revenue, not January revenue. Record it when you deliver the work.

Step 3: Calculate Cost of Goods Sold

COGS for a consulting business is typically lower than for product businesses, but it still exists. Include any direct costs incurred specifically to deliver client work. For our example:

Common mistake: Putting everything into operating expenses and having zero COGS. This makes your gross margin 100%, which is misleading. If you hire freelancers, buy materials, or incur travel specifically for client projects, those belong in COGS. The test: would this cost disappear if you had zero clients this month? If yes, it is COGS.

Step 4: Calculate Gross Profit and Gross Margin

Gross Profit = Total Revenue - Total COGS. This is the most important line on your entire P&L because it shows how much money you have available to run the business before any fixed costs.

An 88.6% gross margin is typical for consulting businesses where the primary cost is the consultant's own time (which is not recorded as COGS, since you are the owner). Professional services firms generally operate at 50% to 70% gross margin when they have employed staff doing billable work. Solo consultants with minimal subcontracting often see 80% to 95%.

Step 5: List All Operating Expenses

Operating expenses are the costs of running the business that do not scale directly with revenue. These are your fixed and semi-variable costs. For our consulting business:

Common mistake: Forgetting annual expenses. If you pay $1,200 per year for professional association membership, allocate $100 per month to keep your monthly P&L accurate. Check your bank and credit card statements for any recurring charges you might have missed.

Step 6: Calculate EBITDA

EBITDA stands for Earnings Before Interest, Taxes, Depreciation, and Amortization. It is calculated as Gross Profit minus Operating Expenses. EBITDA shows the operating profitability of your business before non-operating items and accounting adjustments.

A 76.3% EBITDA margin is excellent but expected for a solo consultant. This figure represents the business's operating earnings before the owner takes a salary, pays taxes, or accounts for equipment depreciation. When you see EBITDA margins this high, remember that the owner's compensation has not been deducted yet.

Step 7: Subtract Interest and Depreciation

If your business has loans, list the interest portion of each payment (not the principal, which goes on the balance sheet). Also include depreciation for any equipment or assets you have capitalized. For our consultant:

Common mistake: Including the full loan payment as an expense. If your monthly loan payment is $500, only the interest portion (say $120) goes on the P&L. The remaining $380 (principal repayment) reduces your loan balance on the balance sheet. Mixing these up overstates your expenses.

Step 8: Estimate Taxes

Tax rates depend on your business structure and total income. For a rough estimate on a monthly P&L, apply the effective rate you expect to pay. Our consultant is a sole proprietor expecting to be in the 24% federal bracket plus 15.3% self-employment tax on 92.35% of net earnings, plus state taxes.

This gives an effective combined rate of about 43.1%. Many first-time business owners are shocked by self-employment taxes. As a W-2 employee, your employer pays half of Social Security and Medicare taxes. As a self-employed person, you pay both halves. Budget 30% to 45% of net income for taxes depending on your state and bracket.

Step 9: Calculate Net Income

Net Income is the bottom line. It is what remains after every cost, expense, and tax. This is the number that tells you whether the business made or lost money during the period.

This consulting business earned $10,570 after all costs and estimated taxes on $24,500 in revenue. On an annual basis (assuming consistent months), that is $294,000 in revenue and $126,840 in after-tax income. The 43.1% net margin is strong for professional services, where 15% to 25% is typical for firms with employees.

Final check: Does your P&L tell a story that matches your bank account? If your P&L says you made $10,570 but your bank balance went up by $15,000, investigate the difference. The gap is usually explained by customer deposits received (not yet earned), principal loan payments made, or equipment purchases that are capitalized rather than expensed.