Cash Flow Is King: Simple Financial Habits That Keep Contractors Flowing

In the world of construction and contracting, cash flow is the most critical facet of your business operations. Without it, everything stalls. 

You know the feeling? You have the right guys and your crew is working hard, leads are coming in, and you have projects lined up for the next few months. On paper, things look great. But, when you look at your bank account on a Friday morning, you find yourself sweating over payroll. You’re checking to see if a certain client’s check cleared, or you’re putting three thousand dollars worth of materials on a second credit card just to keep a project moving.

Before we figured out how to keep the cash-flow positive, we spun our wheels for at least a year going month-to-month, wondering where the profits went, why the bank account was always just-north of a negative balance, and borrowing from deposits on future jobs to pay for present needs. It. Was. Exhausting…and discouraging.

1. Master Your Margins: Margin vs Markup

One of the most common mistakes contractors make is confusing markup with margin. This small mathematical error can cost you tens of thousands of dollars a year.

The Mistake: You estimate your labor and materials (COGS) for a job at $10,000. You want a 20% profit, so you multiply $10,000 by 1.20 and sell the job at $12,000. You think you have a 20% margin. You’re wrong.

The Reality: You actually only have a 16.6% margin. Why? Because margin is calculated based on the price (Contract Price), not the cost. If your overhead (insurance, truck payments, office rent, software) is high, that 16% might barely cover your bills, leaving you with zero actual profit.

Pause here. Price  is not the same as cost. “In business terms, price is the amount of money a customer pays for something and cost is the amount of money it takes to produce something.” 

Our remodeling firm targeted a 30% profit margin (a 42% markup on the cost of each project). This allowed us to retain a 20% net profit annually—which we mobilized for vehicle and equipment purchases and generous bonuses for our staff and ownership. We were also able to take on larger projects and move into commercial work and absorb the initial hurdle of overcoming 60-90 day net pay periods. 

How to Fix It:

To stay out of trouble, you must know your Gross Margin. This is the percentage of your total revenue that is left after you’ve paid for the direct costs of the job, a.k.a. COGS or Costs of Goods Sold (Labor and Materials).

• Calculate your Overhead: Total up what it costs to run your business for a year, excluding job-specific costs. This includes your salary, your truck, your tools, and your marketing.

SIMPLIFIED Example Overhead: Vehicle, $12,000/yr + Software/CRM, $8,000/yr, + Salary, $80,000/yr = $100,000/yr (or about $8,400/mo). 

*If you hit this amount, you simply break even. 

• Build in “Net Profit”: This is the money the business keeps to grow or bonus its employees and owners. It is separate from your paycheck. For the construction industry most firms do 5-8% but you should aim for 10-12% for bonuses and reinvestment purposes.
• Stop the “Standard” Markup: Just because the guy down the street marks up 20% doesn’t mean you should. Your business has different costs. Price your jobs based on your financial needs, not the local average. Also, make sure you don’t confuse markup and margin. Both matter. Become an expert and then stop apologizing for your prices.

2. Job Costing: Find the Leaks

If your business is a boat, job costing is the act of checking for holes. Many contractors wait until the end of the year to look at their P&L (Profit and Loss) statement to see if they made money. By then, it’s too late. Job Costing is like running a P&L on each project. Shorter sprints or snapshots, especially early on, are critical for understanding the big picture. 

Reading a P&L at the close of the year without job costing is like looking at a map and thinking you know the terrain. 

Job costing is the habit of tracking every single dollar spent on every specific project—every hour of labor, every box of nails, every subcontractor invoice—and comparing it against your original estimate.

Why It Matters for Cash Flow:

Without job costing, you might have one “winning” job that is highly profitable, which is subsidizing three “losing” jobs that are draining your cash. You feel like you have money, but in reality, you are bleeding out. If you don’t catch this early, you’ll keep booking jobs that aren’t profitable and perpetuate the downward trajectory toward your business’s demise. 

The Correction:

Weekly Review: Don’t wait until the job is over. Every week (Friday), look at your labor hours for the week. Are you halfway through the budget but only 30% through the work? If so, you need to know now so you can adjust your pace or talk to the client about a change order. This also trains your team members to be attentive to the details and to think like business owners.

• The Post-Mortem: When a project ends, sit down for thirty minutes with your team. Did you spend more on materials than you thought? Did the sub-contractor overcharge? Use this data to make your next bid more accurate. Or, determine that a certain job type or customer type isn’t for you and redirect toward the jobs and customers that afford you the best opportunity for success.

3. Deposits and Payment Schedules: Stop Being the Bank

Why are you lending money to your customers? When you start a job without a deposit, and you spend $5,000 on materials and $3,000 on labor before you send your first invoice, you have just given your customer an $8,000 interest-free loan. 

This is the fastest way to run out of cash. If you have several jobs starting at once and you have to “front” the money for all of them, your bank account will hit zero before the first wall is framed. Also, don’t assume the customer is going to hit the pay link right when they see the invoice! Even if they do, transactions typically take 2-3 days to clear and sometimes you get hit with the “random” 10 day payment hold. 

Playing loose with your cash flow creates tight confinements where there’s no margin for error. That’s a high-stakes and high-impact game to play. One warranty call, one delay, one frozen payment could be the end.

The Strategy:

The 33/33/33 Rule (or similar): For smaller residential jobs, aim for a third upfront, a third at a major milestone (like “dry-in”), and the final third upon completion (or something approximating that split).

We always required 10% at signing and then 20% on day one of the project.

Mobilization Fees: For larger projects, charge a “Mobilization Fee.” This covers the time and cost of getting your equipment to the site, ordering materials, and scheduling. 

This is also called a “retainer” which essentially secures your preconstruction engagement until project launch. Don’t underestimate the importance of this and don’t think of it as nitpicky. You are running a business, not a charity. Contractors who “loan” their services beyond the first visit, are gambling. Even well intentioned customers have to change directions at times and  you can’t be the one that eats that cost.

The “Deposit” Psychology: A customer who is hesitant to give a deposit is a customer who might be slow to pay the final bill. Getting money upfront isn’t just about cash flow; it’s a “litmus test” for the client’s financial health.

Also, you’ve earned it! You showed up for the consultation. You built the bid. You refined the numbers and called on subs. That time isn’t free.

4. Bill Like a Pro

In construction, “The older the bill, the harder it is to collect.” Out of sight, out of mind is a real phenomenon. 

If you finish a phase of work on a Wednesday but don’t get around to sending the invoice until Sunday night, you’ve just delayed your payment by four days for no reason. If your client then takes two weeks to pay, you’re looking at nearly 20 days where your cash is trapped.

Need help with this? Set up automated payment reminders. Most CRMs and FSMs have this option for electronic payment requests. Also, double up on the first payment request. For example, when I sent out payment requests, I wouldn’t just hit “send” in the CRM portal, I would hit also send a text message to the client thanking them for choosing us, wishing them a good day or evening, and, letting them know they had a payment request in their inbox and that we appreciated their prompt response.

Simple Billing Habits:

• Invoice Immediately: The best time to send an invoice is the moment the client is happiest. Did you just finish the beautiful tile work? Send the invoice from your truck before you leave the driveway.
• Use Progress Payments: Never wait until the “end” of a job to get paid. Tie your payments to clear, visible milestones (e.g., “Foundation poured,” “Rough-in complete”). This keeps cash flowing into the business throughout the life of the project. Every signed contract should include an agreed-upon payment schedule. This outlines expectations around that match deliverables. For example:
  • Deposit – At Signing (10%)
  • First Payment – Start Day (20%)
  • Second Payment – After Rough Inspection (30%)
  • Third Payment – After Paint (30%)
  • Final Payment – Project Completion (10%)
• Go Digital: If you are still mailing paper invoices and waiting for paper checks, you are living in the dark ages. Use software (like QuickBooks, Jobber, or JobTread) that allows clients to pay via ACH or credit card with the click of a button. It might cost a small fee, but getting that money 5 days faster is worth every penny.

5. Build a Cash Reserve

Construction is a seasonal industry. One month you’re turning down work; the next month you get zero calls.

A cash flow crisis usually happens when a “famine” period hits and you have no savings to bridge the gap.

The Reserve Habit:

You should aim to have 3 to 6 months of operating expenses sitting in a reserve account. This isn’t money for a new truck or a new shop; it’s the “Safety Net.”

The 1% Rule: If you don’t have a reserve yet, start by taking 1% or 2% of every check you receive and moving it into a separate “Reserve Account.” You won’t miss 2% on a $10,000 check, but after 20 jobs, you’ll have a significant cushion.

Committing to this step was probably the first big move we made to stabilize our business once we were profitable. That’s because, even if you’re profitable, you can ruin things by thinking that the “extra” money is available to spend. Forced savings vehicles are great ways to reestablish proper boundary lines for professional operations. Are your tax payments optional? How about tool repairs? No, all of these things are hidden until you realize they are not. Also, you will position yourself up for major reinvestments and acquisitions. First employee! New truck with branding! New website! First commercial client (with a net 60 pay schedule).

Profit First: Treat your business savings like a bill that must be paid (again, forced savings). Before you pay yourself or your subs, put a small portion into your reserve account—and don’t touch it!

Avoid “Robbing Peter to Pay Paul”: This is the most dangerous habit in contracting—taking the deposit from Job B to finish Job A. Once you start this cycle, it is almost impossible to stop, and it usually ends in a business collapse. A cash reserve prevents you from ever having to do this.

You should pride yourself on being able to fix your mistakes. I remember hearing a hardscape contractor brag about how he could take the biggest jobs because he had the margin to fix them if he messed up. His reserve accounts allowed him to play bigger games and place bigger bets. Also, customer care includes the bandwidth/ability to warranty your work and your subs work. Mistakes and miscalculations happen—you owe your customer the peace of mind that when they arise, you’re prepared to address them promptly.

Summary: The “Health Check” Table

Use this quick checklist to see where your business stands today:

Final Thoughts

Running a contracting business is a high-stakes game. You take on significant risk, manage complex schedules, and deal with demanding clients. You deserve to be rewarded for that effort with more than just a “break-even” bank account.

The difference between a stressed contractor and a healthy one isn’t usually the quality of their craftsmanship—it’s the quality of their financial habits and commitment to best business practices. By defining your overhead and margins, tracking your costs, requiring deposits, billing quickly, and saving for the off season, you ensure that Cash Flow remains the King of your business.

When you control your cash, you control your time, your stress level, and your future.