Contractor Billing Software for Field-Service Work
The job finishes and the invoice is already written. Parts pulled from the truck and hours off the timer are on it, the office can check it before it goes out, and the customer pays from a link with no account to create. Work done Tuesday gets billed Tuesday — not the Sunday somebody finally sits down with a pile of job sheets.
Generic invoicing software for contractors hands you an empty document and wishes you luck. Field service invoice software starts from the job itself — which parts left which truck, how long the technician was on site, what the customer already approved and signed for. That is what separates contractor billing software built for service work from a blank template with your logo on it, and contractors feel it in the first week.
Nothing gets retyped
The invoice inherits the job's parts, labor and tax. No evening spent rebuilding the day from job sheets, and no charges lost in the copying.
Nothing goes out wrong
Optional office approval catches zero-dollar invoices, wrong discounts and missing lines before the customer ever sees them.
Nothing waits for signal
Create, send and take payment with no connection at all. It syncs when you are back in coverage, without double-charging anyone.
An invoice raised from a finished job lands at the top of the office approval queue.
Estimate, Job and Invoice Lifecycle
Four steps, one thread, no retyping. Every price the customer agreed to, every part off the van and every hour on site walks forward into the bill on its own. This is the whole argument for contractor billing software that lives inside the job rather than beside it.
Estimate approved
Customer verifies by one-time code and signs; the chosen tier becomes the scope
Job performed
Parts pulled from the vehicle, hours on the timer, photos captured
Draft invoice
Created from the completed job, carrying its parts and labor
Sent and paid
Optional office approval, then the customer's portal link
Rebuilding an invoice from a job sheet is where the hours go and where the missed charges hide. Inheriting it costs nobody an evening. The full quote-to-job-to-invoice chain — including how the estimate itself gets approved with a one-time code and a signature — is on the estimate-to-job page.
What Invoice Data Can Be Reused After Verification
Four things land on the bill without anybody keying them: the parts, the hours, the tax and the warranty. That is where most invoicing software for contractors quietly leaks money — the part nobody wrote down, the half-hour nobody remembered, the tax applied to the wrong half of the job.
Parts at retail
Parts consumed on the job — already deducted from that vehicle's stock — appear as line items at their retail price.
Labor from the timer
Hours recorded on the Pro work-and-pause timer become the labor charge, so you bill the time the job actually took instead of a round number typed from memory.
Per-item tax
Tax is applied per line item and totalled, which matters where labor and materials are taxed differently.
Warranty coverage
Individual lines can be marked warranty-covered: $0 to the customer, original price struck through, real cost still on the job.
Anything found on site that was not quoted can be added as an extra line before the invoice is sent, so the bill matches the work rather than the plan. The warranty rule is enforced by the system rather than left to whoever is typing: if a line is marked warranty-covered but arrives with a non-zero amount, Opsler corrects it to $0 before the invoice saves.
These same part-cost and labor-hour records are what drive job-level margin. See how they roll up on the per-job profitability page.
Office vs Technician Billing Responsibilities
You decide how much you trust the van, and you change your mind per job. Turn office approval off and the technician bills from the driveway. Turn it on and the same invoice waits in an office queue for a second pair of eyes. Opsler starts you in the sensible place — a job raised by a field agent goes through approval, a job raised by the office or the owner goes straight out — and both are one click to override on any job you like.
| Step in the bill | In the van | In the office |
|---|---|---|
| Turning finished work into an invoice | The technician closes the job and the invoice is there, parts and hours already on it | Nothing to rebuild, nothing to chase |
| Getting it to the customer | Sends it on the spot when the job runs direct-send | Approves and sends in one click when the job runs through the queue |
| Tidying the line items | Adds anything found on site before it goes | Edits lines, notes and discounts while the invoice is still pending |
| Catching the one that is wrong | Resubmits in a minute with the reason in hand | Rejects with a written reason of up to 1,000 characters |
| Taking the money | Records cash, check or transfer before driving off | Watches paid, partly paid and overdue update themselves |
With approval switched on, a submitted invoice lands in the office’s pending queue. From there your office staff or owner edit the line items or notes and then approve it, approve and send it to the customer with the PDF and payment link attached, or reject it back to the technician with a reason they can act on immediately. An experienced crew usually runs direct-send and gets paid faster for it. A shop breaking in new technicians, or billing five-figure work, keeps the queue and sleeps better. Most owners end up using both, and switch on the job that warrants a second look.
Invoicing and estimating are both included on Budding, the free plan, so you can bill real jobs without paying anything. Pro adds separate Office Staff seats, the work-and-pause timer that puts labor hours onto the invoice on its own, and the QuickBooks and Xero export — $25 a seat, month to month, and you only buy seats for the people you actually have.
Customer Delivery Through the Token-Link Portal
Every step between sending an invoice and the customer actually reading it is a day added to your cash cycle. A password reset is a week. So Opsler sends a private link that opens on the first tap — no account, no app, no “I never got it”. Field service invoice software wins or loses on this one screen, because it is the only part of the whole workflow your customer ever sees.
Email notification
Goes to the email address on the customer record the moment the invoice is sent.
No-login customer portal
A token link opens the Invoices tab: full line-item breakdown, per-item tax, subtotal, total, notes, PDF download and a Pay Now link. No password, no app.
Nothing to configure, nothing per message
Email carries the invoice and the portal link. No provider account to open, no credits to top up, no per-message cost between you and getting paid.
Bill the Job Before You Leave the Basement
Signal drops in basements, plant rooms, lift shafts and half the countryside, and that is exactly where the work finishes. Billing carries on regardless. Your technician raises the invoice standing next to the customer, takes the money if there is money to take, and drives away with the job closed. That is the whole difference between getting paid this week and getting paid whenever somebody catches up on paperwork — and on a fifty-job month it is the largest single thing this software does for your bank balance.
- Create an invoice from the completed job
- Send the invoice
- Record a payment, including a partial one
- Built-in protection prevents any double-charge on retry
Everything queued offline syncs the moment you are back in coverage — the customer’s email and portal link go out then, and the invoice appears in the office approval queue if that setting is on.
Payments, Reminders, Taxes and Accounting Boundaries
Payments
Multiple partial payments per invoice; amount paid, amount due and status recompute after each. On-site collection can redefine the invoice total where the amount differs.
Reminders
Configurable per invoice or as a tenant default: on or off, days after due date before the first one, days between repeats, and a maximum count. Sent by email; checked once a day.
Tax
Applied per line item and totalled on the document, so labor and materials taxed at different rates come out right without a manual calculation.
Accounting
QuickBooks-formatted and Xero-formatted CSV export on Pro. Your bookkeeper imports the month in minutes and keeps control of exactly what reaches the ledger and when.
You decide who gets chased and how hard. Reminders stay off until you switch them on, and when you do, they run to your rules — how long after the due date the first one goes, how often it repeats, when it stops. Overdue invoices flag themselves on the dashboard in the meantime, so the money that is late is the first thing the office sees on a Monday, not something discovered at quarter end.
Collect however your customers pay: cash is on out of the box, and you can add check, bank transfer or handle-based Venmo, Cash App and Zelle links, all shown on the invoice itself. You keep your own payment provider and its rates, and nobody takes a slice of what you collect — on real card volume that is usually a bigger number than the software bill.
Contractor Billing vs Construction Progress Billing
“Contractor billing” covers two models that work nothing alike, and buying the wrong one costs you a quarter. Service billing turns a finished visit into money this week. Progress billing draws against a schedule of values over months. Opsler is built end to end for the first, which is how every HVAC, plumbing and electrical service business on earth actually gets paid.
| Dimension | Service billing — what Opsler does | Progress billing — construction software |
|---|---|---|
| Billing trigger | A completed job | A milestone or percentage complete |
| Document | One invoice per job | Draw against a schedule of values |
| Money held back | None — you bill the full value | Retainage until completion |
| Typical cycle | Days | Months |
| Cash arrives | Often the same day, on site | After the draw is approved |
Read the left-hand column again: days rather than months, and cash that often arrives on the driveway. That is the cash cycle Opsler is engineered around, and it is the reason a two-van shop can run on the free plan and still be paid faster than a competitor on an enterprise contract.
Who This Is For, and How to Start
This is billing sized for a business that gets paid per job: HVAC, plumbing, electrical, appliance repair, garage doors, cleaning — anyone who finishes work at an address and wants the money moving before the van leaves.
Where it earns its keep
- Billing per completed service or repair job
- Collecting on site or through a customer link
- Office review before invoices go out, when you want it
- Working where signal drops mid-job
- Parts and labor that must reach the invoice accurately
- Handing clean data to a bookkeeper each month
What it costs you to run
- 0% of what you collect — keep your own payment provider and its rates
- No per-message fee: email carries every invoice, link and reminder
- Nothing posts to your ledger unseen — your bookkeeper imports the batch
- Free forever for two seats, then $25 a seat with no minimum
Getting your first invoice out
- Pick a business-type preset at registration for starting price-book items and terminology.
- Decide the default: technician direct-send, or office approval — override per job whenever you need to.
- Set up your manual payment methods (cash, check, or Venmo/Cash App/Zelle handles) or your own payment link.
- Run one real job end to end and watch the invoice build itself from the parts and hours — that is the moment most owners stop doing evening paperwork.
Start on Budding for nothing — two seats, 50 jobs a month, unlimited customers, no expiry — or take Pro at $25 a seat a month with no seat minimum and a 14-day trial that never asks for a card. Either way you can bill a real week of work before you commit a penny, and your sixth hire costs $25 rather than a whole new plan.
Frequently Asked Questions
The three contractors ask before they switch.
Does Opsler sync invoices directly with QuickBooks or Xero?
Opsler hands your bookkeeper a QuickBooks-formatted or Xero-formatted CSV on the Pro plan: download the period, import it, done in minutes. Because it is a reviewed batch rather than a live pipe, your ledger only ever receives what someone has looked at — which is exactly the control most owners want over the one system their accountant signs off.
What happens if the office rejects a technician's submitted invoice?
It returns to draft with a written reason of up to 1,000 characters, and the technician gets that exact reason on their phone. They fix the line items and resubmit, and the customer never sees a version of the bill anyone had doubts about. That single loop is why shops running contractor billing software with an approval queue stop having the awkward second phone call about a wrong invoice.
Can a technician raise the invoice with no signal in the building?
Yes — creating the invoice, sending it and recording the payment all work with no connection at all, then sync when the phone finds coverage. For field service invoice software this is the difference between money collected on the driveway and money chased in a fortnight: the customer is standing right there, card in hand, and nothing on the screen is waiting for a bar of signal.
Ready to Run Your Business Without the Chaos?
Scheduling, dispatch, estimates, invoicing, customer portal, and a free branded website — start completely free, upgrade to Pro when you scale.
Free forever on the Budding plan. No credit card required.