Backcharges and Setoff: Defending Against Unilateral Deductions
A backcharge is the general contractor deciding you owe it money and taking it out of your next payment. Whether that deduction is legitimate or abusive comes down to notice, proof, and the contract's setoff language.
Key takeaways
- A backcharge is a deduction a GC makes from a subcontractor's payment for costs it claims the sub caused (cleanup, repairs, delays, supervision).
- Legitimate backcharges require advance notice, an opportunity to cure, and documented actual cost — not a round-number deduction.
- Broad setoff clauses let a GC withhold from one project for alleged debts on another ('cross-project' setoff) — a significant risk.
- Contracts should require written notice before any backcharge and limit deductions to documented, reasonable, actual costs.
- Unsubstantiated or surprise backcharges are a common pressure tactic during disputes; the contract is your defense.
- Preserve your right to dispute a backcharge and to be paid the undisputed balance.
What a backcharge is — and when it's legitimate
A backcharge is the general contractor's deduction from a subcontractor's payment for costs the GC says the sub is responsible for: cleaning up debris the sub left, repairing damage the sub caused, covering a missed deadline, or supplying labor the sub failed to provide. Backcharges are a normal part of construction accounting, and a legitimate one is grounded in fact: the sub was given notice and a chance to fix the problem, declined or failed, and the GC incurred a documented, reasonable, actual cost to cover it.
The abuse is the backcharge that skips those steps — a deduction asserted with no notice, no cure opportunity, and no backup, often a tidy round number that appears for the first time on a pay application during a dispute. The difference between the two is process and proof.
Setoff: the broader and more dangerous power
Setoff is the contractual right to withhold money owed on one obligation to satisfy a claimed debt on another. The narrow version lets a GC net a legitimate backcharge against the same project's payment. The dangerous version is cross-project setoff: a clause permitting the GC to withhold payment on Project A for an alleged debt the sub owes on unrelated Project B. For a subcontractor running several jobs with one general contractor, a broad setoff clause turns a dispute on one project into a cash-flow problem on all of them.
These clauses should be read narrowly and, where possible, limited to the project at hand and to liquidated, undisputed amounts — not to whatever the GC unilaterally asserts.
At contract review
Require written notice and an opportunity to cure before any backcharge, limit deductions to documented and reasonable actual costs, and cap or delete cross-project setoff rights. Preserve your right to dispute a backcharge while still being paid the undisputed portion, so a single contested deduction cannot hold an entire payment hostage.
Backcharge and setoff provisions hide in payment and default sections and are easy to overlook until money is withheld. A first-pass review should flag broad setoff language and missing notice requirements, so your team fixes the process before the first deduction lands.
This article is general information about construction contracting and law, not legal advice. Construction law varies significantly by jurisdiction and project. Consult qualified counsel about your specific contract and circumstances.
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