Parts
Each part with its number and supplier, the parts invoice attached, tagged to the vehicle.
Trade finance · Mobile mechanic
Record parts and per-vehicle job costs
As a mobile mechanic you buy parts on the way to the job: an alternator, brake pads, a sensor, fluids, plus a core charge you'll get back when you return the old unit. Each job is a vehicle and a customer, and the parts-store invoices stack up in the door pocket. Cash Workspace gives you one place to record each part with its part number and supplier, attach the parts invoice and core-charge document, and tag warranty parts for return tracking.
The problem
Why mobile parts costs get lost
Parts are bought in quick stops across several jobs in a day, and core charges and warranty returns float separately. Without recording each part against its vehicle, the parts cost of a job never adds up.
- A day's parts runs cover three vehicles and the invoices all blend together.
- A core charge is paid but the credit on return is never matched back.
- A warranty part replacing a failed one isn't flagged for the return.
- Part numbers aren't recorded, so you can't confirm what went on which vehicle.
- Fluids and small parts bought at the counter never hit any job.
The workflow
Record parts against each vehicle
Make a record per part with its number and supplier, attach the invoice, and tag the vehicle, core charge, and any warranty.
- 1
Open a job per vehicle
Create a folder per job, e.g. 2026 / Smith - 2014 F-150 - alternator, when you take the job.
- 2
Record each part
Record the part with its part number, supplier, amount, and date, then attach the parts invoice.
- 3
Note core charges
Record any core charge as a separate line and attach the core-charge document so you can match the credit on return.
- 4
Tag warranty parts
When a part is a warranty replacement, tag it so the return and any credit are tracked separately.
- 5
Match the credit
When the core or warranty credit comes back, record it against the same job so the buy and credit reconcile.
- 6
Review per vehicle
Before invoicing the customer, scan the vehicle's folder so every part and credit is recorded.
Record structure
What to record for each part
A consistent field set keeps parts, cores, and warranties findable per vehicle.
- Vehicle / customer
- The vehicle and customer the part went on, kept as a consistent job tag.
- Part name & number
- What the part is and its part number, so the right part maps to the right vehicle.
- Supplier
- The parts store or distributor the part came from.
- Core charge
- Any core charge paid, recorded so the credit can be matched on return.
- Warranty flag
- Whether the part is a warranty replacement to be returned.
- Amount and date
- What the part cost and when it was bought.
- Parts invoice / core doc
- The parts invoice and core-charge document attached to the record.
Example setup
An example mobile mechanic job folder
One way to organize a vehicle job in your workspace.
Cores & credits
Core charges paid and the matching credits on return, with core-charge documents attached.
Warranty returns
Warranty-replacement parts flagged for return, with their invoices and any credit recorded.
Common mistakes
Mistakes to avoid
- Letting a day's parts invoices blend so no vehicle's parts cost is clean.
- Not recording part numbers, so you can't confirm what went on which vehicle.
- Paying a core charge and never matching the credit when you return the unit.
- Failing to flag a warranty part, so the return goes untracked.
- Skipping counter buys of fluids and small parts.
How it helps
How Cash Workspace helps
Parts tied to the vehicle
Record each part with its number and supplier under the vehicle's job so parts cost stays per vehicle.
Attach invoices and core docs
Attach the parts invoice and core-charge document to the record so the paper trail stays with the part.
Flag cores and warranties
Tag core charges and warranty parts so returns and credits are tracked against the job.
Related
Related parts and contractor workflows
Returns & credit records
Match core charges and returns to their original buys.
Warranty & callback records
Organize warranty parts and callback costs by job.
Appliance repair parts log
A similar per-call parts log for repair techs.
Per-job expense report
Pull one vehicle's recorded costs together for review.
All finance workflows
Browse the full Cash Workspace workflow library.
FAQ
Mobile mechanic parts records FAQ
- How do I keep one day's parts straight across three vehicles?
- Record each part under the vehicle's job folder with its part number and supplier, so a single day's parts-store runs don't blend into one cost.
- How do I track a core charge?
- Record the core charge as its own line with the core-charge document attached, then record the matching credit against the same job when you return the old unit.
- Can the workspace tell me my parts markup?
- It keeps your recorded part cost alongside the job so you can review it; it does not compute markup, margin, or profit for you.
Organizing help — not tax, accounting, or legal guidance
Cash Workspace is a free workspace for organizing invoices, expenses, receipts, clients, and documents. This page is organizing guidance only — not tax, accounting, legal, or bookkeeping guidance. Cash Workspace does not connect to your bank, does not scan or read your receipts for you, and does not move or collect payments. Whether an expense is deductible depends on your situation, so confirm it with a qualified accountant or tax professional.
Keep every part on its vehicle's record
Start a free workspace and record each part with its number, invoice, and core or warranty flag so every vehicle job's parts cost and credits reconcile cleanly.