How to Create a Contractor Invoice

What every invoice needs

• Your business name, address, phone, email, and license number if you carry one.
• A unique invoice number. Sequential numbering (1001, 1002, 1003) makes bookkeeping easier.
• Invoice date and due date.
• Customer name and service address.
• A line-item breakdown of work performed: description, quantity, unit price, line total.
• Materials and labor separated if your customers expect that detail.
• Subtotal, tax, and grand total.
• Payment terms (net 30, net 15, due on receipt, etc.).
• How they can pay you (credit card link, Venmo handle, mailing address for checks, etc.).

What is smart to include but optional

• A signature line for the customer to acknowledge the work was completed satisfactorily.
• Photos of before and after attached to the invoice. Big deal for residential customers and disputes.
• Warranty terms (how long, what is covered, what voids it).
• Late fees policy (1.5 percent per month is common and legal in most states).
• A thank-you note. Sounds soft. It works.

Payment terms that get you paid

Net 30 used to be standard. It is no longer. Most service businesses are moving to net 15 or due on receipt because cash flow matters more than tradition.

For one-time service calls, due on receipt is the right answer. The customer is standing there. They pay before you leave. For project work or commercial accounts, net 15 with a 2 percent discount if paid in 7 days is a common setup.

Common contractor invoice mistakes

• Vague line items. "Repair work" is not a line item. "Replaced kitchen faucet (Moen Arbor)" is.
• No due date. Without a due date, the customer assumes whenever.
• No payment method shown. The customer has to call to find out how to pay you.
• Waiting too long to send it. Send the invoice within 24 hours of finishing the job, ideally before you leave.
• Forgetting to follow up. Most invoices that go unpaid never got a reminder.

Software vs DIY

You can write invoices by hand or in Word. But once you are doing more than a few a week, invoicing software pays for itself. Card payments that auto-mark paid, automated reminders, customer history in one place, and the ability to invoice from your phone before you leave the driveway are all huge time savings.

Closing thought

The fastest way to improve your cash flow is to invoice the same day you finish the job and follow up on anything still open after seven days. Most late payments are not customers refusing to pay. They are customers who forgot. A friendly reminder gets most invoices closed.

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