How to Invoice for Warranty Work

Why This Matters

Warranty work is roughly 3 to 6 percent of total job volume for a healthy shop. On a $1.2M shop, that is $36,000 to $72,000 of annual activity that must be invoiced correctly. Mishandled warranty invoicing can blow up in 2 ways. First, customers who receive unclear warranty bills dispute them at 4 times the rate of standard invoices, which ties up cash and damages relationships. Second, shops that fail to document warranty work properly lose the ability to recover manufacturer parts reimbursements, which can be thousands of dollars per claim on major equipment. A proper warranty invoicing system protects the customer experience, recovers manufacturer parts costs, and creates the legal paper trail you need if warranty work becomes a dispute. Shops that get this right report 40 percent fewer warranty related complaints and recover 78 percent of eligible manufacturer warranty reimbursements.

The Steps

1. 1

   Step 1: Verify the warranty is actually valid

   Before issuing a warranty invoice, verify the original job, the warranty terms, and the failure cause. Pull the original invoice in Kaldr Tech and check the warranty period (typically 1 year parts and labor for repairs, longer for installs). Confirm the failed part is the same one you installed, not a different component. Verify the failure was not caused by customer abuse, environment, or unrelated issues. If any of these checks fail, the claim is not a warranty claim, it is a new repair and should be billed accordingly. Document the verification in the job notes.

   Pro tip: Warranty coverage disputes are almost always about scope. Verify scope carefully.

2. 2

   Step 2: Create the warranty invoice with zero dollar line items

   Create a new invoice in Kaldr Tech tagged as Warranty. List the work performed as a line item with a price of $0 and a note stating 'Warranty replacement under [warranty name], original job invoice #[number] dated [date].' This zero dollar line item documents exactly what was done, references the original job, and makes it clear to the customer that she is not being charged. Do not skip this step. An invoice with no line items at all looks confusing. An invoice with a clear zero dollar description looks professional and thorough.

   Pro tip: Always include the original invoice number on the warranty invoice for audit trail.

3. 3

   Step 3: Bill any non warranty costs clearly and separately

   Sometimes a warranty visit finds additional work that is not covered. A warranty capacitor replacement might reveal a worn contactor that is not under warranty. Bill the non warranty work as a separate line item at standard rates with a clear description. Show the customer the visual evidence before charging. Say 'Mrs. Thompson, the capacitor is covered under warranty at no charge. While I was working I noticed this contactor is pitted and will fail in the next year. That is not covered by the original warranty. I can replace it today for $189 or you can schedule it for later. Your call.' Transparent communication prevents disputes.

   Pro tip: Never sneak non warranty charges onto a warranty invoice. Always announce them verbally first.

4. 4

   Step 4: Document the failure cause with photos

   Take photos of the failed component showing the defect. Upload them to the invoice in Kaldr Tech. The photos serve 3 purposes. First, they prove the failure for any future dispute. Second, they support manufacturer warranty parts reimbursement claims. Third, they help the shop track failure patterns that might indicate a bad batch of parts or a tech installation error. Photos take 30 seconds to capture and can save hundreds of dollars in a single disputed warranty case.

   Pro tip: Include a ruler or common object in the photo for scale reference.

5. 5

   Step 5: File the manufacturer warranty claim immediately

   If the failed part is covered by the manufacturer (compressors, motors, circuit boards often are), file the manufacturer warranty claim within 48 hours of the warranty visit. Most manufacturers require claim filing within 30 to 60 days or the claim is denied. Use the manufacturer's online portal or phone claim line. Attach the photos, the original install invoice, and the failure description. The manufacturer typically sends a replacement part at no charge and often reimburses a portion of the labor. On a $1,400 compressor under warranty, manufacturer reimbursement can net $600 to $900 back to the shop.

   Pro tip: Assign one person in the office to be responsible for filing all manufacturer warranty claims.

6. 6

   Step 6: Communicate the warranty resolution to the customer

   After the warranty visit, send the customer a follow up text or email within 24 hours. Template: 'Hi Mrs. Thompson, thank you for letting us take care of the warranty replacement today. Your system is now working properly and is covered by our warranty for the remaining term plus an additional 90 days on the replaced component. If you have any questions or concerns, please reply to this message. Thank you for trusting us with your home.' This follow up reinforces the positive experience and prevents post warranty dissatisfaction from festering into a negative review.

   Pro tip: Always extend the warranty by 90 days on replaced components. It costs nothing and builds loyalty.