What Must Be on an Auto Repair Estimate and Invoice? (California, Florida, New York)

Updated 2026-10-17. Sources are listed at the end.

A mobile mechanic who skips the written estimate is one dispute away from working for free. In several states, the paperwork isn’t optional. It’s the law, and a missing line can cost you the right to collect for work you already did. Here is what three states with detailed rules actually require, with links to each agency, so you can build one estimate and invoice format that holds up almost anywhere.

Quick comparison

Sources: California BAR, Write It Right; Florida FDACS, Motor Vehicle Repair; NY DMV, Open a repair or body shop.

California: “Write It Right”

California’s Bureau of Automotive Repair (BAR) publishes the most detailed public guide, Write It Right. Key points, with the statute or regulation BAR cites:

The estimate

• It must describe the specific job and give the estimated price for all parts and labor. Parts are presumed new unless the estimate says used, rebuilt or reconditioned (BPC § 9884.9, CCR § 3353(a)).
• Sales tax goes on the invoice, not the estimate (CCR § 3356(c)(5)).
• Toxic-waste disposal charges tied to the job must be itemized separately on both the estimate and the invoice. If you charge one, include your EPA number.
• If the customer asks for the old parts back when they authorize the estimate, note it on the estimate (BPC § 9884.10).

Shop supplies. BAR is blunt: charging for “shop supplies” or “miscellaneous parts” is prohibited. You can charge only for supplies actually used on that vehicle, included in the estimate and itemized on the invoice (CCR § 3356(g)). If you’re used to adding a flat percentage for rags and cleaner, that habit doesn’t work in California.

The invoice must include:

• Your registration number, business name and address as shown in BAR’s records.
• An itemized list of all services and repairs with prices, including diagnosis, warranty work and anything done at no charge.
• Each part in plain terms with its price, and whether it’s new, used, reconditioned or rebuilt.
• Subtotals for labor and parts, the sales tax, any toxic-waste fee and the total.

Records. Keep them for at least three years, available for BAR inspection, with a unique identifier linking every document from one job (CCR § 3358).

Florida: the 10% / $50 rule

Florida’s Motor Vehicle Repair Act requires anyone paid to repair someone else’s vehicle to register with the Florida Department of Agriculture and Consumer Services (FDACS). Its FAQ spells out the rules:

• Authorization comes from the customer’s signature. You can give the estimate by phone or another method, but FDACS says to note the specifics of the notice and authorization on the work order to protect yourself.
• Overruns. You may not exceed the written estimate by more than $10 or 10%, whichever is greater, up to $50, without the customer’s written or oral consent. On a $300 estimate, 10% is $30, so the most you can bill without new consent is $330. On a $1,000 estimate, 10% would be $100, but the $50 cap applies, so the limit is $1,050.
• Teardowns. If you tear down a vehicle and find the estimate won’t cover the repair, you must notify the customer right away and get authorization. If they decline, you must “expeditiously” reassemble the vehicle in reasonably similar condition, unless they waive that or it would be unsafe.
• The invoice must include the date and odometer reading, what was done, itemized labor, parts and costs, anything provided free or at reduced cost, whether parts are used, rebuilt or reconditioned, what’s guaranteed and for how long or how many miles, and your FDACS registration number.
• Records. Keep them for one year. Give the customer a copy of anything they sign.

New York: registration and consent

New York’s DMV requires repair shops to register. Customer authorization is required, and the final bill can’t exceed the written estimate without consent (NY DMV). New York also taxes most repair charges, parts and labor alike. See the sales tax guide.

One format that works in all three

If your paperwork meets the strictest version of each rule, you’re covered in most places:

1. Header: business name, address, phone, and any state registration number.
2. Vehicle: year, make, model, VIN and odometer.
3. Customer complaint and authorization: signature, date and time, or a written note of a phone or text approval with the time.
4. Labor lines with a description and price for each, including diagnosis and no-charge work.
5. Parts lines with a plain-language name, part number, condition (new, used, rebuilt or remanufactured) and price.
6. Supplies only as actual items used, not a flat percentage, if you work in California.
7. Fees listed separately: disposal, trip or service-call fee, diagnostic fee.
8. Subtotals, tax and total.
9. Warranty terms: what’s covered, and for how long and how many miles. See how to write a parts and labor warranty.
10. Change-order log: each added item, the new total, and how and when the customer approved it.

The free estimate & invoice generator lays these fields out, and most shop management software stores signatures and approval timestamps for you.

Why this matters when a customer won’t pay

Clean paperwork is your evidence. In a small-claims case or a lien dispute, the signed estimate and logged change orders show what the customer agreed to pay. See what to do when a customer won’t pay.

Related

• Mobile mechanic license requirements
• How to price mobile mechanic jobs
• Labor rate & break-even calculator

Sources

• California Bureau of Automotive Repair, Write It Right: https://bar.ca.gov/wir
• Florida Dept. of Agriculture and Consumer Services, Motor Vehicle Repair (FAQ): https://www.fdacs.gov/Business-Services/Motor-Vehicle-Repair
• New York DMV, Open a repair or body shop: https://dmv.ny.gov/business/open-a-repair-or-body-shop