Updated October 21, 2026
Invoice software for auto repair shops is really repair order software. The invoice is the last step of a document that starts at check-in, collects the customer’s authorization, adds labor and parts as the technician finds things, and ends with a payment. Software that only prints a bill misses the parts of that chain that protect your margin.
Quick answer: Choose software that builds the invoice from the repair order: labor by flat-rate or actual hours, parts with your markup, shop supplies and disposal fees, sales tax by line, a recorded customer authorization for every added item, digital inspection photos, and text-to-pay. Test it with the fill-in template below before you sign anything.
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An accounting app can send a pretty invoice, but an auto repair invoice has rules most businesses never deal with. Labor is billed by a time guide or actual hours at a posted rate. Parts carry a markup and sometimes a core charge. Many states require a written estimate and the customer's approval before work beyond it, and some require old parts to be offered back. Tax may apply to parts and not labor, or both, depending on where you are. A tool that cannot handle those lines forces your service writer to fudge them, and fudged lines are where money and trust leak.
Enter this repair order in each system you are considering. If any line is awkward, you will feel it a hundred times a month. The prices are illustrative; use your own rates and tax rules.
Example totals (illustrative): labor 1.8 h + 0.6 h at $140 = $336; parts $210; fluid $18; shop supplies $25; disposal $5; tax 7% on parts and fluid only = $15.96. Invoice total $609.96.
Then ask: did the authorization for line 3 attach itself to the invoice? Does the declined tire recommendation show up next time the car comes in? Did the text-to-pay link work from a phone? Could your service writer do this while a customer is standing at the counter?
Most shops pick decent software and then lose money in the gaps between steps. The approval text goes out and nobody notices the customer replied. The car is done at 3 PM and the customer finds out at 5:30. The declined brakes are never mentioned again. The unpaid fleet invoice sits for sixty days. None of that is a software feature; it is follow-through that falls on a busy service writer.
Many states and some cities have auto repair rules about written estimates, how far a final bill may exceed the estimate without new approval, and whether replaced parts must be offered back. Look up your state's rules (often through the attorney general or a bureau of automotive repair) and make sure your software can store the estimate, every approval with its time and method, and the parts-return choice on the repair order. If a customer disputes a bill months later, that record is what protects you.
Unmanually is a 24/7 AI Office Manager for shop owners who spend the day under cars and the evening on the phone. It answers calls and texts about appointments and status, books drop-offs, tells customers when their car is ready, follows up on declined work at the date you set and chases unpaid invoices. It works next to your shop software and asks before anything that spends money or cannot be undone. See what it does for auto repair shops, or run the calculator to see the office hours it gives back.
What the AI Office Manager does for auto repair shops, from calls to unpaid invoices.
Parts matrix math for setting sell prices.
Why status calls and missed calls cost bays.
Repair orders that become invoices, labor and parts lines with your rates and markup, shop fees, line-level tax, recorded customer authorizations, inspection photos, and card and text-to-pay payments.
You can, but it usually cannot handle labor guides, parts markup, authorizations and declined-work follow-up. Most shops use shop management software and sync the totals to accounting.
Enter the same test repair order in each trial, including an added repair that needs approval and a declined recommendation, and check how each system records them.
Home service businesses answer only about half their calls (Invoca, July 2026), and owners spend about 11 to 16 hours/week on admin. Knowing what to do is the easy part; the money leaks out in the calls you can't take, the quotes nobody chases and the invoices that sit unpaid. Unmanually is a 24/7 AI Office Manager for auto repair shops that you run by voice from your phone:
Sources: Invoca, July 2026 (52% of home-service calls answered by a person, 60M+ calls); admin hours: Time etc / Censuswide 2023 and Amex SME Barometer 2026.
Unmanually is an AI Office Manager that works 24/7 and that you run by voice from your phone. Leave your mobile number and the AI Office Manager calls you right away, the same way it would call back one of your customers. That call is the demo: it answers, books you a 15-minute time with the founder and follows up.
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