The pay application comes back short. At the bottom, a line you did not put there. Take this one as the running example for the rest of this article: Backcharge — cleanup and rework, third floor — $6,200. Substitute your own number; the procedure does not change.
No invoice attached. No dates. No photo. Nobody called.
An electrical contractor backcharge dispute with a GC almost never turns on whether the charge was fair. It turns on which of you can reconstruct the day it refers to.
The superintendent has a dated daily log with manpower counts and a two-line narrative. Most electrical subs have timecards that say 8.77 hrs.
That is the whole fight. Not the contract language, not the lien statute — the record.
This is the procedure for answering one in writing: what to send, in what order, by when, and what evidence actually kills the charge. Everything here works with a legal pad and an email account.
Nothing below is legal advice. Subcontract terms and state lien and prompt-pay laws vary. For a charge large enough to hurt, have a construction attorney read your subcontract.What a GC Backcharge Is, and How It Differs From an Invoice Dispute
A backcharge is money a general contractor deducts from what it already owes you, to cover a cost it says your work caused. You are not billed. You are paid less, and you usually find out on the pay app.
That difference changes the whole playbook.
| Customer invoice dispute | GC backcharge |
|---|
| Who starts it | Your customer, after your invoice lands | The GC, on its own, inside your pay app |
| What is in question | Whether your hours and rates are fair | Whether your crew caused a cost |
| Where the money sits | You are waiting to be paid | The money is already withheld |
| What silence means | The invoice ages | Can waive the objection, if your subcontract sets a dispute window |
| What settles it | An explanation of the charge | A dated record of who was on site and what they did |
If a customer is questioning your invoice rather than a GC deducting from it, that is a different procedure — see what to attach to a disputed T&M invoice.
The rest of this covers what the GC takes from you.
Backcharge vs. Disallowed T&M Hours
On lump-sum subcontract work, the GC deducts from your contract value and you find it on the pay application. On T&M work, the same dispute usually arrives in a different envelope: hours you already billed on a ticket come back refused. "Those four hours on 5/12 were rework. We are not paying them."
The distinction matters because it changes what is actually being argued. With a deduction, the money was earned and then taken back, so the GC is the one asserting a cost and the GC is the one who has to substantiate it. With disallowed hours, the GC is arguing the money was never owed in the first place, and the weight lands on you to show the hours were authorized work rather than a correction of your own mistake.
The five categories below split fairly predictably between the two forms. Rework and failed-inspection charges usually surface as disallowed T&M hours on a ticket. Trade damage, cleanup, and delay usually surface as deductions on the pay application.
The record that answers them is the same record. What changes is which letter you attach it to, and whether you are asking for a deduction to be reversed or for refused hours to be paid.
The Five Backcharges Electricians Actually Get Hit With
Five categories cover most of what lands on an electrical sub's pay app. Each is beaten by a different piece of the same record.
| Backcharge | What the GC claims | What answers it |
|---|
Notice what every row in the right column has in common. It is a date, a location, a crew, and a description — not a total.
Why the Sub Usually Loses: A Record Problem, Not a Contract Problem
A backcharge is a factual claim about a specific day. Whoever can reconstruct that day wins.
On most commercial jobs the prime contract requires a daily report, so the superintendent writes one every afternoon. It is contemporaneous, which means it was written when the thing happened, not remembered afterward.
The electrical sub shows up six weeks later with a payroll summary and a memory. Both sides may be telling the truth. Only one side recorded it.
Look at the difference in a single line.
| A record that loses | A record that ends it |
|---|
Tue 5/12 — Ramirez — 8.77 hrsTue 5/12 — Ramirez + Vega — 6:58a–3:31p — 3rd floor east — pulled and terminated circuits 12–18, rough-in complete, called for inspectionThe first one proves you paid somebody. The second one proves what was done, where, and by whom, on the day the GC says something went wrong.
That second line is not a software feature. It is one sentence a journeyman writes at the end of the day, and it is the single highest-leverage habit in this entire article.
Read Your Subcontract Before You Write a Word
Five clauses decide how much of the charge is even legal to take. Find them before you respond, because your letter should quote them by number.
| Clause | What to look for | Why it matters |
|---|
Custom subcontracts written by large GCs frequently strip the notice and cure provisions that the standard forms include. Read yours; do not assume it matches AIA A401 or ConsensusDocs 750.
On federal construction work, the Prompt Payment Act (31 U.S.C. § 3905) requires the prime to pay subcontractors within seven days of receiving payment, and to state the reason for any withholding. Most states have analogous statutes for public and private projects.
The First 72 Hours After the Deduction Lands
Move in this order. Steps 1 and 2 take about fifteen minutes and preserve everything else.
1. Object in writing the same day. Many subcontracts contain a window for disputing a deduction in writing. If yours does and it passes, your objection can be waived on timing alone, before anyone looks at the facts. That is the clause to find first. Send this to whoever signs the pay applications, by email, and keep the sent copy.Received Pay Application #___. We object to the $______ backcharge shown as "______"
and reserve all rights under the subcontract and applicable payment statutes. A written
response with our field record will follow within ___ days. Any lien waiver we execute
is conditional and limited to amounts actually paid.
Before we respond substantively, please provide, for each item in the $______ backcharge:
the date the cost was incurred, the vendor or subcontractor invoice, hours and labor
rates charged, the names of the workers who performed the work, the contract provision
you are charging under, and any photographs or inspection records identifying the
condition. Please also provide a copy of the written notice of the claimed defect and
our opportunity to correct it.
The Backcharge Rebuttal Letter
Send it by email and, for anything large, certified mail. Keep it factual and short. Attach the record; do not describe it.
[Date]
To: [Project Manager], [GC Company]
Re: Project [Name] — Pay Application #___ — Backcharge of $______ dated ______
Sent by email and certified mail
We received Pay Application #___ reflecting a deduction of $______ described as
"__________." We dispute this deduction and reserve all rights under the subcontract
and applicable prompt payment and lien statutes.
- NOTICE. Section ___ of our subcontract requires written notice of a claimed defect
and an opportunity to correct it before corrective work is performed or hired out.
We received no such notice. If you believe notice was given, please provide a copy.
- SUBSTANTIATION. Please provide, for each charged item: date of the cost, the vendor
or subcontractor invoice, hours and labor rates, the names of the workers, the
contract provision charged under, and photographs or inspection records.
- OUR RECORD FOR THE DATES IN QUESTION. Attached is our field record for [dates],
showing crew, hours, work area, and work performed. It establishes that:
[ ] our crew was not on site on ______;
[ ] the work described as incomplete was complete as of ______ and passed
inspection on ______;
[ ] the condition charged arose after our work in that area was finished and
accepted;
[ ] the work charged as rework was authorized on signed T&M tag #___ dated
______, signed by ______;
[ ] the correction was caused by [RFI/bulletin ___], not by our installation.
- MARKUP. Section ___ limits overhead and profit on back-charged work to ___%. The
amount charged exceeds that limit.
- REQUESTED ACTION. Reverse the deduction of $______ on the next pay application. If
you believe any portion is supported, provide the substantiation in item 2 for that
portion and we will address it on its own.
We are available to walk the condition with you on site this week.
[Name], [Title]
[Company]
Five numbered facts and an attachment beat three paragraphs of argument. Strike any item that does not apply rather than softening it.
How to Price-Check a Backcharge
Dispute the amount separately from the principle. Even a charge you partly deserve is usually padded, because nobody itemized it.
The following is example arithmetic on the example $6,200 lump-sum charge for cleanup and rework. Rates are placeholders — substitute your own market's numbers and your own subcontract's markup cap.
| Line item | Inputs | Amount |
|---|
| Cleanup labor | 2 laborers × 8 hrs × $38/hr | $608 |
| Replacement electrical sub at premium T&M rate | 1 × 6 hrs × $95/hr | $570 |
| Dumpster pull | 1 × $450 | $450 |
| GC supervision | 4 hrs × $85/hr | $340 |
| Subtotal | $1,968 |
| Markup at contract cap | 15% of $1,968 | $295 |
| Supportable total | $2,263 |
| Charged | $6,200 |
| Unsupported | $6,200 − $2,263 | $3,937 |
Look hard at that second line. A replacement electrical sub billed at a premium T&M rate, for a correction your own journeyman could have made at your rate, is the padding pattern that shows up most often on an electrical backcharge. This is exactly what the right-to-cure clause is for. If you were never given the three days to send your own man, the delta between your rate and the replacement's is not a cost you caused.
The GC does not have to accept your arithmetic. They do have to produce theirs, and that is the point of the exercise.
Watch for four specific inflations: the GC's own supervision billed at a project-management rate, labor billed at the GC's rate rather than the cost of the corrected work, markup stacked above the cap in your subcontract, and a replacement sub's premium rate charged for work you were never given the notice and cure period to perform yourself.
To run the same kind of arithmetic across a year of disputed and slow-paid invoices, the invoice dispute calculator does it with your own inputs and shows every one of them.
What a Defensible Day Looks Like in Your Records
A defensible day has five things, recorded the day it happened: the date, the crew member, the hours, the specific area, and what got done in plain language.
That is it. Five fields, one sentence, roughly fifteen seconds per person.
On T&M work, add a sixth field for anything outside base scope: the number of the GC-signed T&M tag covering it, and who signed it. A tag the GC's own superintendent signed on the day in question is close to dispositive, because it is the GC's own record that the work was authorized. It is also the one exhibit a T&M sub holds that a lump-sum sub does not.
Here is the same shift recorded three ways.
| What the record says | Answers a backcharge? |
|---|
8.77 hrsTue 5/12 — Ramirez — 8.77 hrs — Job 214Tue 5/12 — Ramirez + Vega — 6:58a–3:31p — 3rd floor east — pulled and terminated circuits 12–18, rough-in complete, called for inspectionThe third line does two jobs at once. It is the note that ends a customer's question about an invoice, and it is the exhibit you attach when a GC says your crew left the third floor unfinished. Same sentence, two uses.
There is one more record you do not have to create, and it is the strongest exhibit an electrical sub holds. The rough-in inspection is a dated, third-party government record that your work was complete and code-compliant on a specific date, before anything closed in over it. Damage discovered after that date shifts the burden to whoever was in that space between the inspection and the discovery — which is why the inspection date belongs in your own job file, with the inspector's name, written down the day it happens rather than chased from the jurisdiction six months later.
You can capture the daily line on a paper daily field report, in a shared spreadsheet, in a group text thread that gets saved, or in whatever time app already has the hours — FieldTimesheet prompts for it at clock-out for that reason. The medium matters far less than whether it gets written the same day.
What does not work is asking the crew to reconstruct a month at the end of the month. Reconstructed records are the ones that lose.
To see what a full set of these notes looks like assembled into a document a third party can read, there is an annotated sample billing packet — no signup, it is just the finished artifact.
Getting the Crew to Write the Line
This is the real obstacle, and it is not a discipline problem. It is a framing problem.
"Write down what you did so I can check on you" gets resistance, and it deserves resistance. Nobody signs up to be audited.
"Write down what you did so the GC can't charge us for a sprinkler line we never touched" gets cooperation, because it is true and because it puts the crew on the same side of the table as the shop.
Three things make the habit stick:
- Ask for one sentence, not a report. Area plus what got done. If it takes longer than a smoke break, it will not happen.
- Show them a win. The first time a note kills a backcharge, tell the crew that the note did it. That is the only training that works.
- Never use it against them. The moment a field note becomes evidence in a performance conversation, the notes turn into "worked on 3rd floor" forever, and the record is worthless.
Concede the One Item You Actually Own
Partial acceptance is the fastest way out of a backcharge you can only partly beat, and most subs skip it because conceding feels like losing.
It is the opposite. Accepting the one item you genuinely caused makes every other denial credible, and it gives the project manager a way to reverse the rest without looking like they got rolled.
Staying with the $6,200 example above — say $412 of it is a conduit your crew genuinely damaged, with a real invoice behind it. The wording is simple: "We accept $412 for the conduit we damaged on 5/8 — invoice attached is correct. We dispute the remaining $5,788 for the reasons in items 1 through 4, and request it be reversed on the next application."
Two other things worth naming plainly. Escalate one level at a time — project manager, then project executive, then the letter that mentions your lien or bond rights.
And weigh the relationship honestly. Filing a lien against a GC you want repeat work from is a real option and a real cost, which is why it belongs at the end of this list rather than the start.
What to Keep on Every Job From Here On
None of this requires software. It requires a habit and a folder per job.
- A daily field record with date, crew, hours, area, and work performed. The daily field report format covers what belongs on it.
- Photos at the end of your work in each area, dated, showing the condition you left it in. This single habit defeats most trade-damage charges.
- Signed T&M tags for anything outside base scope, signed the day of the work.
- A change order and RFI log tying every plan revision to the labor it caused, so rework charges can be traced to their source. See tracking change order labor.
- Every pay application and every waiver you signed, in date order.
- The permit and inspection card, with inspector name and date for every rough and final. It is the one dated third-party record in the folder, and you cannot recreate it after the fact.
For the broader habit of billing T&M work so it does not get argued in the first place, T&M billing best practices covers the estimate-side half of this.
Common Questions About GC Backcharges
Can a GC backcharge me without written notice?
Practically, yes — the deduction shows up whether or not notice was given. Contractually, most subcontracts require written notice of the claimed defect first, and a charge issued without it is the easiest kind to get reversed. Ask for a copy of the notice in your first response; if none exists, say so in writing.
How long do I have to dispute a backcharge?
The window is set by your subcontract, not by statute, so it has to be read rather than assumed. Find it, calendar it, and send a one-paragraph written objection the day the deduction appears so the clock stops while you assemble the rest.
Does the GC have to give me a chance to fix the work before hiring someone else?
Under standard forms, generally yes. AIA A401 requires written notice and gives the subcontractor three working days to begin correcting before the contractor may cure the default and charge the cost. Custom GC subcontracts often narrow or remove this, so read yours rather than assuming.
What documentation actually beats a backcharge?
A contemporaneous, dated, per-worker record of who was on site, in what area, doing what — plus dated photos of the condition you left. On T&M work, add the GC-signed tag for anything outside base scope and the date your rough-in passed inspection. Payroll totals do not do it, because a total proves you paid someone without proving what they did or where.
Can I be backcharged for damage another trade caused to my rough-in?
You can be charged for it; you should not end up paying it. The defense is a dated record and photos showing your work was complete and undamaged when you left the area, plus the date the rough-in passed inspection. An inspection is a third-party record with a date on it, so once you have it the question becomes who was in that space between the inspection and the discovery — and that is the GC's to answer, not yours.
Can a GC backcharge me for delays I did not cause?
Delay backcharges are the most contestable category, because they require the GC to show your work was on the critical path and that you, not a design change or another trade, caused the slip. Your record of when you were released to each area and what you were waiting on is the whole defense.
Should I sign a lien waiver while a backcharge is pending?
Sign a conditional waiver limited to the amount actually paid, never an unconditional "paid in full" release covering the netted amount. Signing away the disputed difference to get the undisputed money released is a common and expensive mistake.
Can a GC backcharge me after the job is closed out?
Closeout is a common time for it: charges get stockpiled and applied against retainage at the end. Your defenses are the same, but they are much harder to mount from memory, which is why the field record has to exist during the job rather than being assembled after it.
The Short Version
A backcharge is an argument about a specific day, and it is won by whoever recorded that day.
Object in writing immediately, demand the itemization before you argue, quote your notice and cure provisions by section number, price-check the amount, and concede the part you actually own.
Then start writing one sentence per person per day. The next backcharge is not a fight you have to win from memory.