Revenue gets the headlines, but margin pays the bills.
Gross Profit Margin tells you how much of every sale actually stays with your business after the work is done.
It’s possible to be busier than ever—booked solid, ordering more supplies, adding hours—and still have less money at the end of the month than you did a year ago. When that happens, margin is almost always the culprit.
In this issue, we’ll break down what Gross Profit Margin measures, how to calculate it in a few minutes, and the practical moves that widen it.
Gross Profit Margin, Defined
Your Gross Profit Margin (GPM) is the percentage of each sales dollar you keep after paying the direct costs of producing or delivering what you sold. That remaining amount is what pays for rent, salaries, marketing, and, eventually, your profit.
Running the Numbers
You only need two figures: Revenue (everything you billed customers for the period) and Cost of Goods Sold (the materials, direct labor, and subcontractor costs tied directly to those sales).
Gross Profit Margin (%) = (Revenue – Cost of Goods Sold) ÷ Revenue × 100
Example: Suppose your business brought in $50,000 last month, and the materials, subcontractors, and direct labor needed to deliver that work cost $30,000.
- Your Equation: ($50,000 – $30,000) ÷ $50,000 × 100
- Your GPM: 40%.
In other words, 60 cents of every dollar is spent before the lights even come on. The remaining 40 cents has to cover everything else.
Why It Deserves Your Attention
Sales tell you how much came in. Margin tells you how much you can actually use.
- 1. It Pays for Everything Else: Gross profit is the only pool of money available for overhead. A thin margin means even a strong sales month can come up short when rent and payroll are due.
- 2. It Exposes Underpricing: If your margin is consistently low, your prices may not reflect what your work is really worth or what it now costs to deliver.
- 3. It Catches Discount Creep: Promotions, rush jobs, and “one more revision” each chip away at profit. Tracking margin shows you when those small concessions start adding up.
When to Check It
A margin problem rarely announces itself. It shows up slowly, one discounted quote and one supplier price increase at a time.
- Standard Check: Monthly. When you close out each month, calculate your margin overall and, if possible, for each major product or service to see which ones carry the business.
- Watch Closely: Weekly. If your margin falls several points below its usual range or your costs are rising, review job costs and quotes every week until you find the source.
Three Ways to Widen Your Margin
Improving margin comes down to three moves:
1. Charge What Your Work Is Worth
- Value-Based Pricing: Base your prices on the results you deliver for the customer, not just the hours or materials involved.
- Annual Price Reviews: Put a pricing review on the calendar every year. Small, regular increases land far better than one large jump after years of rising costs.
2. Lower Your Direct Costs
- Shop Your Suppliers: Collect competing quotes on your biggest materials and services each year, then use them to negotiate with the vendors you want to keep.
- Cut Waste and Rework: Every redo, return, or wasted material comes straight out of your margin. Simple checklists and quality checks pay for themselves quickly.
3. Sell More of What Earns the Most
- Feature High-Margin Offers: Once you know which products or services earn the best margin, put them front and center in your marketing and sales conversations.
- Bundle Thoughtfully: Pair lower-margin items with high-margin add-ons so the full sale stays profitable without resorting to discounts.
The Takeaway
Growing sales is only half the job. The other half is making sure each sale is worth making. Know your Gross Profit Margin, check it every month, and treat any slide as an early warning rather than something to explain away at tax time.
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