Do not deposit the payment yet.
That is the whole first move, and almost every article on short-paid invoices skips it. Search the phrase and you get accounts receivable software companies explaining deduction codes and dispute workflows for enterprise AR teams. None of it is written for someone holding a cheque from a homeowner, which is where this happens in the trades. And in the United States, the words printed on that cheque can decide the outcome before you make a single phone call.
The deposit decision comes before the collection decision
Most contractors treat a short payment as a collections problem: how many follow-ups, how firm, when to lien. That sequencing is backwards. The first decision is whether to accept the money at all, and you have days at most to make it.
UCC section 3-311, adopted in some form across the United States, discharges a claim when three things line up. The payer tendered the instrument in good faith as full satisfaction. The amount was unliquidated or subject to a bona fide dispute. And the instrument, or an accompanying written communication, contained a conspicuous statement that it was tendered as full satisfaction. If the claimant then obtains payment of the instrument, the claim is discharged.
Read that again with a homeowner's cheque in your hand. "Paid in full" in the memo line is the conspicuous statement. Their complaint about the tile is the bona fide dispute. Your deposit is obtaining payment. All three conditions are met at the teller window.
Watch out
This is not a theoretical risk. In a Mississippi case reviewed by NCS Credit, a general contractor deposited a cheque marked "Final Payment," then sued for the balance. The court held that cashing a cheque marked final payment constituted accord and satisfaction and barred the contractor from bringing future claims for additional payment. The contractor had told the owner repeatedly that he did not consider the payment final. It did not matter.
The move that feels clever and loses in court
Ask around a jobsite and someone will tell you to just cross out the words and bank it. That advice has been tested and it fails.
In Omni Alarm Systems v. MCI Electric Company, a Virginia circuit court held that an electrical contractor's cheque marked payment "in full" discharged the remaining debt, and that the creditor's negotiation of the cheque ended the obligation even though the creditor had marked through the "in full" notation and written "Amount in Dispute" beside it. In Laganas v. Installation, a District of Columbia case, a contractor scratched the "paid in full" language off the instrument and cashed it. The court found the removal inconsequential, because the act of cashing operated as acceptance on the terms the debtor had set.
The logic is contract logic, not banking logic. The marked cheque is an offer, depositing it is acceptance, and crossing out the notation is a counteroffer the customer never saw and never agreed to. Fullerton and Knowles, the construction credit firm, puts it flatly: striking out the language will not prevent the debtor's discharge, and the only safe course is to not deposit the cheque and to respond in writing asking for a new one without the restrictive endorsement.
Two things cut the other way. A cheque carrying no full-satisfaction language is just a partial payment: in So v. 514 10th Street Associates, a DC court found no accord and satisfaction where the cheque did not bear "paid in full" or similar wording. And an ambiguous cover letter is not enough either. In Weston Builders and Developers v. McBerry, a $50,000 cheque arrived with a letter describing it as "representing the deposit paid on the contract," which the Maryland court held was not an unequivocal offer of accord and satisfaction.
If you already banked it, start counting to 90
Most contractors reading this have already deposited the cheque, because the office deposits everything on Friday and nobody reads memo lines. There is a rescue provision.
UCC 3-311(c)(2) says the claim is not discharged if the claimant proves that within 90 days after payment of the instrument, the claimant tendered repayment of the amount of the instrument to the person against whom the claim is asserted. In plain terms: give the money back, in full, within 90 days, and your claim survives.
That is a hard pill. If a customer short paid a $14,000 invoice by $1,800 and marked it paid in full, preserving the claim means writing them a cheque for $12,200 and going back to zero on a job you have already paid for. It is only rational when the disputed amount is large relative to the payment, or when the customer is a repeat commercial account where the precedent matters more than the invoice. Get a lawyer to confirm how your state has enacted the section before you do it.
There is also a defensive setup most small shops never use. Under 3-311(c)(1), an organisation that sends customers a conspicuous statement in advance saying communications about disputed debts, including any instrument tendered as full satisfaction, must go to a designated person, office or address, can defeat the discharge if the marked cheque never reached that address. One line on your invoice template. It is the cheapest insurance here.
Canada is a different country, legally as well as geographically
Every US-focused article on this topic is wrong for Canadian readers, and the difference runs the opposite way from what you would guess.
Canada has no Uniform Commercial Code. The question is decided under common law accord and satisfaction, and the leading construction-adjacent authority is IBI Group v. LeFevre and Company Property Agents, decided by the Supreme Court of British Columbia in January 2004. A developer disputed an architect's $26,817.73 invoice and sent a cheque for $16,050 with a letter stating it was tendered as full and final settlement, was not to be accepted as partial payment, and that depositing it would mean agreement. A receptionist opened the letter, the cheque went to accounting, and accounting banked it. The small claims judge held the account settled.
On appeal, Justice Rice set that aside. Reviewing cases back to Day v. McLea in 1889, including Woodlot Services v. Flemming in New Brunswick and Champlain Ready-Mixed Concrete v. Beaupré at the Ontario Court of Appeal, he summarised the law in three points. The onus is on the payor to prove the payee expressly accepted the part payment as full payment, to a standard described as heavy and substantial. A condition attached to the part payment, however clear, is not determinative, because what governs is the recipient's intention and whether it was expressly communicated. And a creditor owes no duty to announce non-acceptance, because silence is not express acceptance.
Note
Same cheque, same wording, opposite outcomes. An Ontario or BC contractor who deposits a cheque marked full and final settlement and then invoices for the balance is in a defensible position. A Virginia contractor doing exactly the same thing has probably lost the balance. If you work on both sides of the border, or your customer is a US company paying a Canadian job, do not assume the rule you learned applies.
The practical advice does not change much, though. IBI Group took a trip to a superior court to fix, and the win came on appeal rather than at trial. Refusing the cheque and asking for a clean one is still faster and cheaper than being right on appeal.
Five things get called a short pay, and they are not the same problem
Once the deposit question is settled, sort the shortfall before you write anything. Billtrust's AR taxonomy splits short pays into disputes, cash-flow shortfalls and deliberate underpayment. For a trades business the useful split is finer, because the first move differs for each.
| Type | What it looks like | First move |
|---|---|---|
| Arithmetic | Cheque is short by an odd amount, no explanation, often matches a deposit they forgot you credited | Send the running balance. Usually settled in one message |
| Unilateral deduction | Round number withheld for something they decided you owed them | Written demand citing the contract clause and the number |
| Quality holdback | Money held against a specific punch item | Schedule the fix in writing with a date, invoice released on completion |
| Scope dispute | They claim the work was included or the price changed | Stop. Documentation exercise before any negotiation |
| Cash flow | Partial payment plus an apology, often with a promise of the rest | Written payment plan with dates, keep lien rights alive |
The distinction that matters most is between the first and the rest. A genuine arithmetic shortfall is not a dispute, and treating it like one converts an easy collection into an argument. It also matters legally: 3-311 requires the claim to be unliquidated or subject to a bona fide dispute, so a customer cannot manufacture accord and satisfaction on an undisputed debt just by writing words on a cheque. The Maryland Anderson v. M and T Bank decision refused to find a bona fide dispute where the payment was simply the agreed instalment amount with a note attached.
The scope dispute is the one to slow down on. When a customer claims a line was included, you are not in a collections conversation, you are in an evidence conversation, and the evidence is the signed scope, the change orders and the dated photos. We covered those mechanics in the piece on handling change orders without losing money.
The 48-hour response: arithmetic, not argument
Write within two business days. Delay reads as acceptance, and in Canada, communicating non-acceptance is literally what saved IBI Group.
The message has four numbers and one question:
- The contracted amount, quoting the contract or accepted quote.
- The amount received, with the date and payment method.
- The difference, as a single figure.
- The date you expect it.
- A request that they confirm in writing what the deduction was for.
That is the whole message. No defence of your pricing, no explanation of why the job took longer, no apology, no threat. Arithmetic is hard to argue with and easy to forward to a lawyer later, and a large share of short payments are not challenges to your work at all. In an r/Contractor thread on this, an office manager described a $15,000 bathroom remodel where the homeowner deducted $300 they had decided was owed, then wrote the cheque a further $1,000 short of even that reduced figure with no explanation for the second gap. Two different problems in one envelope, and only one of them had a stated reason.
If the answer is silence, you now have a documented, unexplained deduction, which is a far stronger position than a phone argument nobody recorded.
Tip
Ask for the reason even when you already know it. A customer who has to put "I deducted $800 because I did not like the grout colour" in writing often pays instead. The ones who write it down have handed you the exact claim to rebut, and the ones who refuse have told a judge something too.
Almost every short pay that turns into a real loss does so because nobody could produce the paperwork fast enough: the signed scope, the change order, the dated photo, the delivery date of the invoice. We build custom CRMs for contractors and home service businesses that keep the quote, the approved changes, the job photos and the payment history attached to the job, so the answer to "what did they actually agree to" takes thirty seconds instead of an evening of scrolling through texts.
Deciding whether to chase, with numbers instead of feelings
Contractors lose more to this decision being made emotionally than to the shortfalls themselves. Both directions cost money: eating every deduction teaches customers that deductions work, and litigating every deduction burns capacity you could be selling with.
Two data points make the frame concrete. Levelset's contractor survey found 80 percent of contractors deal with late payments on a regular basis, with average days sales outstanding in construction sitting between 60 and 90 days against a 30 to 45 day norm elsewhere, so slow and short money is structural rather than proof you attracted a uniquely bad customer. And Markup and Profit published a long exchange with a contractor named Garrett staring at $2,000 unpaid on an $87,000 job. His own accounting killed the fight: 20 hours chasing it, at $50 an hour of his selling time, was $1,000 before any legal fee. His previous lien had run 10 months and $45,000 in legal fees to net $15,000 out of $300,000.
The workable rule is a two-line test.
Chase the record always. The written demand is nearly free and it changes the customer's behaviour on the next job, or removes them from your list. Skip it and you have taught someone that a deduction is a discount.
Chase the money when recovery exceeds the loaded cost of recovery. Estimate the hours honestly, price them at what your time actually earns, add filing fees, compare. If the answer is close, the answer is no. If the shortfall is large enough to matter, the sequence is written demand, then formal demand letter citing your contract's costs-of-collection clause, then lien or small claims.
Building the job so the last payment cannot hurt you
Prevention here is structural, not conversational, and there are three levers.
Shrink the final payment. Markup and Profit's guidance is to size the last payment so you could walk away from it without being financially hurt, and to treat that as a dollar figure rather than a percentage, because 10 percent of a $300,000 job is not a walk-away number for anyone. The full draw arithmetic, including why thirds fail on anything longer than two weeks, is in the progress payment schedule breakdown.
Put a dispute window in the contract. A clause giving the customer a defined number of business days after substantial completion to raise any issue in writing, after which the invoice is deemed accepted, converts a vague end-of-job argument into a deadline. Ten business days is a common figure, and it gives you something specific to point at when a deduction appears three weeks later for a problem nobody mentioned at the walkthrough.
Add the designated-address line to your invoice template. One sentence stating that any communication about a disputed amount, including any payment tendered as full satisfaction, must be sent to a named person at a named address. In the US that is the 3-311(c)(1) defence. Everywhere else it still routes the marked cheque to someone who reads memo lines instead of to the deposit pile.
None of these is a conversation with a difficult customer, which is the point. The customers who short pay are the least likely to be talked out of it, so the defences have to be in the paperwork before the job starts.
The checklist
Print this and tape it inside the folder where cheques land.
- Before depositing anything, read the cheque face, memo line, endorsement area, envelope, email and remittance advice. Look for paid in full, final payment, or full and final settlement.
- If that language is there and you are in the US, do not deposit. Photograph both sides, return it, ask in writing for a replacement without the restrictive endorsement.
- If you already deposited it, note the date. You have 90 days under 3-311(c)(2) to tender repayment and preserve the claim.
- If there is no full-satisfaction language, deposit it. Banking a plain partial payment waives nothing.
- Classify the shortfall as arithmetic, unilateral deduction, quality holdback, scope dispute or cash flow. Do not treat an arithmetic error as a dispute.
- Send the four-number message within 48 hours and ask, in writing, what the deduction was for.
- Diarise the lien deadline the same day, from last furnishing, not from the date the argument started.
- Do the recovery arithmetic before deciding to fight, counting your hours at what your time actually earns.
- Log the outcome against the customer record, so the next quote for that name carries the history.
The honest bottom line
A short payment is two decisions wearing one costume. The first is legal, urgent and mostly invisible: whether accepting this money ends your right to the rest. The second is commercial and slower: whether the balance is worth what it costs to recover. Almost every article on this topic answers the second question and never mentions the first, which is how contractors end up crossing out three words, banking a cheque, and finding out in court that they settled.
Get the deposit decision right, put the arithmetic in writing inside two days, and make the next job's final payment small enough that none of this can hurt you. The rest is keeping records good enough that when someone asks what was actually agreed, you can answer in thirty seconds.
This is general information about how these rules work, not legal advice. Accord and satisfaction has been enacted differently across states, California's Civil Code section 1526 conflicts with its own commercial code on the point, and Canadian common law reaches a different answer entirely. For anything with real money attached, spend an hour with a construction lawyer in your jurisdiction before you deposit or return anything.