Invoicing for mobile mechanics

Invoice Koi is an invoice app for mobile mechanics, so the invoice exists while the customer is still standing next to the car, the parts and the labour already on it.

Make an invoice free

The iPhone app is coming to the App Store.

An illustration of a socket set, a torque wrench, an oil filter, four spark plugs and a funnel, with a koi swimming among them.

The customer is standing next to you and the job is finished. That is the moment the invoice should exist. Not that evening, from a photograph of a parts receipt and a memory of how long the alternator took.

01On the document

What mobile mechanics
put on an invoice.

Save these items with your own rates. Tap to add them to an invoice, with the unit, price and totals filled in.

Line	Unit
Mechanical labour	hrs
Call-out and diagnosis	each
Parts	job
Oil and filter service	each
Brake pads and discs, per axle	axle
Recovery and transport	each

Set your own prices. The app's starter rates are placeholders. To bill one job today with nothing installed, the free mobile mechanic invoice template opens in your browser with these lines on it.

A job, grouped Subtotals per section

DIAGNOSIS

Call-out and diagnosis£85

Subtotal£85

PARTS

Alternator, replacement£320

Belt and tensioner£110

Subtotal£430

LABOUR

Mechanical labour£240

Subtotal£240

Total£755

Grouped line items work on all nine templates.

A photograph of a mobile mechanic beside an open bonnet on a driveway, phone in one hand.

02Why mobile mechanics use it

Three things that
save the evening.

The factor receipt, read and filed

Photograph it at the counter. Merchant, amount, tax and category come off the paper, and the picture stays with the job.

Invoiced at the roadside

A PDF out through email or any messaging app while the customer is still standing there, with your logo and your terms on it.

Hours on the job, on the invoice

Track time against the customer and turn it into a line, so the three hours the alternator took is the three hours you bill.

03 · Questions

Asked by mobile mechanics.

Can I invoice at the roadside?

Yes, and with no signal. Everything is on the phone, and the PDF goes out through your own mail or messaging app when you have a bar again.

How do I bill parts at cost?

Keep a "Parts" line priced at zero and set the figure per job, or scan the factor receipt and put the real number on it.

Can the customer pay by card in the app?

Yes. After Stripe setup, Koi can collect card payments online through a payment link. Koi charges 0.35% with a subscription, or 0.7% + £0.10 without one, plus Stripe processing fees. A payment made through a Koi payment link marks the invoice paid on its own. Cash, bank transfers and anything paid elsewhere, you record yourself. Recording one yourself carries no Koi fee.

Weighing up apps? Invoice Koi vs Square Invoices and Invoice Koi vs Invoice Fly set the features side by side, including where they win. Or see all 12 comparisons.