A pay-when-paid clause delays your payment until the main contractor has been paid by their client. Before signing, check whether it has a fixed outer date, whether it is pay-when-paid or the harsher pay-if-paid, and what your suspension and notice rights are, then have a solicitor or lawyer confirm it is valid under the law that governs the contract.
The danger is not the phrase itself. It is that your cash flow, your wages and your supplier terms run on your calendar, while this clause hands the calendar to someone further up the chain. The work below is a pre-signing routine, with a worked cash-flow example and a sample clause review.
Two clauses that sound alike and are not
Most subcontractor trouble starts with treating these as the same. They behave differently when the client stops paying.
| Pay-when-paid | Pay-if-paid | |
|---|---|---|
| What it does | Timing: you are paid after the contractor is paid | Condition: the contractor being paid is a condition of your right to payment |
| If the client never pays the contractor | You are usually still owed the money, though collecting it may be hard | You may never be owed it |
| Typical wording | "within 7 days of the Contractor receiving payment" | "payment by the Employer is a condition precedent to payment to the Subcontractor" |
| Risk you carry | Delay | Delay and non-payment |
Rules about both vary widely by country and by state or region. Some places ban or restrict one or both, some require clear wording before a pay-if-paid clause works, and some leave the parties free to agree. This tutorial does not tell you which applies to you, and an AI tool cannot either. That is the job of the solicitor or lawyer in the final step.
What a subcontractor checks first: five questions
- Is there an outer date? A clause that says "pay within 14 days of receipt of payment" with nothing else is open-ended. Look for something like "and in any event within 60 days of invoice".
- Is the client's non-payment a condition? Look for "condition precedent", "only if", "unless and until". These words point to pay-if-paid.
- What must the contractor do to get paid? A duty to invoice promptly and to pursue the client is worth having in writing.
- Can you suspend and how? Look for a right to suspend after written notice, and what the notice steps are.
- What happens to retention? Retention is the slice held back until the end; check when it is released and whether release also depends on the client paying.
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Buy nowA main example: what it does to a small firm's cash
An illustrative four-person electrical subcontractor takes a $60,000 job over three months. It invoices at the end of each month for the value done: $15,000, $20,000 and $25,000. Costs, mostly wages and materials, run at 70% of value and are paid as they arise, so costs are $10,500, $14,000 and $17,500 in months one to three.
Compare two sets of terms. Terms A: payment 30 days from invoice. Terms B: pay-when-paid, where the client pays the contractor 60 days after the contractor invoices, and the contractor then pays the subcontractor 7 days later. In effect, the sub waits about 67 days from invoice.
| At end of month 3 (day 90) | Terms A (30 days) | Terms B (pay-when-paid, about 67 days) |
|---|---|---|
| Costs paid out so far | $42,000 | $42,000 |
| Cash received | $35,000 (invoices 1 and 2) | $0 (first payment due day 97) |
| Net cash position | -$7,000 | -$42,000 |
| Month-3 invoice paid on | Day 120 | Day 157 |
The work, the price and the margin are identical. Under Terms B the firm is $42,000 out of pocket at its worst point, 70% of the whole contract value, and stays there until the first payment on day 97. Under Terms A the worst point is about $27,000, just before the second payment lands on day 90, and it drops to $7,000 that day. A firm without that cash must borrow, delay its own suppliers or stop work, and the borrowing has a cost. If it pays 12% a year on an overdraft averaging $30,000 for two extra months, that is about $600, small beside the risk but real. The bigger point is that a cash gap is a business decision hidden in a legal clause.
Now the pay-if-paid version. Suppose the client owes the contractor and the contractor is never paid. Under Terms B you are usually still owed the $60,000 and can pursue it, though how depends on the governing law. Under pay-if-paid with a valid condition, your claim may fail completely. Same numbers, entirely different risk. This is why the wording matters more than the days.
Using AI to read the clause, not to bless it
An AI assistant is quick at breaking a clause into its moving parts. Paste only the clause and any definitions it uses, strip out names and prices, and check the tool's data settings first.
I am a small subcontractor about to sign. Below is a payment clause and its definitions. You are not giving legal advice.
1. Say in plain English whether this is pay-when-paid, pay-if-paid or neither, and quote the words that tell you.
2. Make a table: payment trigger, number of days, outer date (if any), what the contractor must do, notice requirements, suspension right, retention terms.
3. List what is missing that I would want to see.
4. Calculate the longest possible gap between my invoice date and payment, if the client pays as slowly as the contract allows.
5. List questions a solicitor should answer before I sign.
Quote the clause for every point. If unsure, say so.A sample clause, reviewed line by line
This clause is invented for illustration. It is not a recommended wording.
9.2 The Contractor shall pay the Subcontractor the amount certified within 10 days of receiving corresponding payment from the Employer. 9.3 Where the Employer fails to pay the Contractor for any reason, the Contractor shall have no liability to pay the Subcontractor until payment is received. 9.4 The Contractor may deduct from any sum due any loss arising from the Subcontractor's delay.
A good AI review might return this table:
| Point | Quoted wording | Reading |
|---|---|---|
| Trigger | "within 10 days of receiving corresponding payment" | Payment depends on contractor's receipt |
| Outer date | none stated | Open-ended wait |
| Non-payment by client | "no liability ... until payment is received" | Close to pay-if-paid; unclear if it is a condition or a delay |
| Set-off | "may deduct ... any loss arising" | Wide; no notice or evidence needed |
| Contractor duties | none | No duty to invoice promptly or chase |
| Suspension | none | No right to stop for non-payment |
What the AI should add as missing: an outer payment date, a duty on the contractor to apply for payment on time, a notice requirement before any deduction, a suspension right, and a definition of "corresponding payment" (does it cover the part of the sum relating to your work only, or any payment on the project?). What you would fix in the AI's reading is any confident statement about whether 9.3 is enforceable. It may say "this is likely to be treated as pay-if-paid". That sentence is a guess about law. Strike it from your notes and move it to your solicitor's list.
Wording you can ask for
These are requests to negotiate, not guaranteed outcomes. Many small subcontractors will not win all of them, and each one you win lowers your risk.
- "...and in any event no later than 45 days after the date of the Subcontractor's invoice."
- "The Contractor shall submit the Subcontractor's application to the Employer within 7 days of receipt."
- "The Contractor may deduct only sums notified in writing, with reasons and calculation, at least 5 days before the due date."
- "If any sum remains unpaid after the due date, the Subcontractor may suspend work after 7 days' written notice."
A second look: two more cases where the timing bites
The slow valuation
Some clauses begin the clock only when a valuation is certified, and nothing says how quickly the certifier must act. A three-week delay in certification adds three weeks to your wait, even if the client pays on time. In the earlier example, three extra weeks would push the first payment to about day 118 and the net cash position at day 90 would still be -$42,000, with the first money arriving a month after the work ended. Ask the AI to compute the longest gap including certification and you will see it.
Retention that depends on someone else
Say a clause holds 5% retention, released "when the Employer releases retention to the Contractor". On a $60,000 job, 5% is $3,000. If release takes 12 months after practical completion, that is $3,000 of your margin, which on a job with a 10% net margin ($6,000) is half your profit, held for a year by a decision you do not control. Try to get retention release tied to a date, such as 12 months after your own completion, rather than to the client's act. Tracking retainage and chasing its release with AI reminders covers the follow-up once the job is finished.
Cash-flow protection you can set up whatever the clause says
Where you cannot change the wording, you can change how you work. These steps are practical, cost little and are worth doing before the first invoice.
- Shorten the billing cycle. Invoicing every two weeks instead of monthly cuts the amount you are owed at any moment. Rerun the cash table from the main example with fortnightly invoices and you will see the unpaid amount at any one time fall, though the wait for each invoice stays the same.
- Front-load a mobilisation payment. Ask for 10% on starting. It will not always be accepted, but it is a common request.
- Pay your own suppliers on longer terms. If your supplier gives 30 days, match it to the project's rhythm.
- Cap exposure. Decide before starting the maximum unpaid amount you can carry (say $20,000) and write the trigger: "if unpaid work exceeds this, I stop and take advice".
- Check the client's credit. A short enquiry into the main contractor's payment record, or a word with other subs, is worth an hour.
For the chasing side, polite reminders for trades covers wording that gets paid without souring the relationship, and pricing variations and change orders helps you keep your invoices in line with what was actually agreed.
Building a one-page cash-flow model with AI
You do not need software for the comparison above. A simple table works, and AI can build and check it.
Build a month-by-month cash table for a subcontract. Inputs: value invoiced each month [15000, 20000, 25000]; costs as a percentage of value [70%]; payment delay in days from invoice [30 for Terms A, 67 for Terms B]; retention [5%, released 365 days after final invoice]. Output: for each terms set, cash in, cash out and cumulative position at day 30, 60, 90, 120, 150 and 180. Show the lowest point and the day it occurs. State your assumptions on timing within each month.The AI will usually produce a clean table. Check three things by hand: that costs are timed as you said they are, that the retention is held back from each payment, and that the lowest point matches your own mental sum. If you prefer to build it in a spreadsheet yourself, the ChatGPT for Excel guide shows how to have an assistant write the formulas.
An email asking for better terms, and how it tends to land
Many subcontractors never ask, because the paper arrives as a take-it-or-leave-it document. Asking politely, with reasons, is normal and costs little. Here is an illustrative draft produced by an AI assistant from a short brief, which you would edit.
Subject: Subcontract payment terms before we sign
Hi [first name],
Thanks for the subcontract. We are happy with the scope and programme. Before we sign, we have three small requests on clause 9 so that our wages and suppliers line up with the payment timing:
1. A latest payment date of 45 days from our invoice, whether or not the Employer has paid.
2. Written notice, with reasons, before any deduction.
3. A right to suspend after 7 days' written notice if a certified sum is unpaid.
If any of these are not possible, could you tell us the payment period in the main contract so that we can plan around it?
Thanks,
[your name]Notice the last line. If the contractor refuses all three, you still learn how long the chain really is, which feeds the cash table. A reply such as "we can do 60 days and the notice, but not suspension" is common, and it is a better position than the one you started from. A reply of silence is information too.
When you are the one passing terms down
The same clause looks different from the other side. Say a small manufacturer subcontracts finishing work to a specialist and wants to pay only when its own customer pays. It carries the same cash gap the specialist would, but in the other direction: if it pays late, the specialist may refuse the next job or add a premium to its price. An HR consultancy hiring freelance trainers faces a milder version of the same thing. Before using a pay-when-paid clause on others, run the same table from the payer's chair: what would you do if you were the one waiting 67 days? The answer often shows that a shorter, fixed term costs less in goodwill than the saving in cash flow is worth, and that is a business judgement, not a legal one.
A realistic mistake: the clause in the schedule
Picture a small firm, as an illustration, that reviews the body of a subcontract carefully and signs. The payment period in the clause is 30 days, which suits it. But a schedule at the back, titled "Payment Mechanism", says payment will be made "in accordance with the Main Contract payment provisions", which in turn refer to a 75-day cycle. The AI summary the firm relied on was run on the body only, and it correctly reported 30 days. The mistake was feeding it a partial document. The fix is cheap: paste every payment-related clause, schedule and definition, and ask the AI to list every cross-reference it finds ("see Schedule 3", "as defined in the Main Contract") so that you can chase each one.
Keeping a payment diary that backs up any later claim
However the clause reads, a dated record decides most disputes. Keep one line per invoice in a simple sheet: invoice number, amount, date sent, how it was sent, the due date under the contract, the date the contractor says they were paid (ask them), the date you were paid, and any deduction with its stated reason. Add a column for "days beyond due date", calculated by formula.
An AI assistant is handy for a monthly summary of the sheet: paste the rows and ask for the oldest unpaid item, the total overdue, and a short factual chaser for each item more than seven days late. A filled-in line might read: "Invoice 2, $20,000, sent day 60 by email to the named contact, due day 67 under the contractor's stated cycle, 14 days overdue, no deduction notified." That one line is the sort of fact a solicitor, or a payment adjudicator where one exists, will ask for first. It is also the line that makes your next conversation with the contractor short and calm, because it holds dates and not feelings.
Five misreadings that cost subcontractors cash
- Reading "pay when paid" as a date. It is not one. Always ask for the longest gap in days, and write that number on the first page of your file.
- Trusting the AI on validity. An assistant told "this clause is probably void" may be right, wrong or out of date. It does not know where your contract is governed.
- Missing flow-down terms. Subcontracts often say the contractor's main contract terms apply to you. Ask for a copy of the payment terms in the main contract, or at least a statement of its payment period.
- Ignoring set-off. A wide deduction right can swallow a payment, even once the contractor is paid.
- Signing under time pressure. A start date is not a reason to skip a half-hour read-through and a one-page solicitor check.
The pre-signing checklist, filled in
Here is the checklist as you would complete it for the sample clause, so you can see what a finished one looks like.
| Check | Finding for clause 9 | Action |
|---|---|---|
| Pay-when-paid or pay-if-paid | Ambiguous; 9.3 reads like a condition | Ask solicitor; seek clearer wording |
| Outer payment date | None | Request 45 days from invoice |
| Contractor duty to apply | None | Request 7-day submission |
| Set-off | Wide, no notice | Request written notice and reasons |
| Suspension | None | Request right after 7 days' notice |
| Retention | Not in extract; check elsewhere | Find the clause, tie release to a date |
| Longest cash gap | Unlimited under 9.3 | Decide the maximum exposure you accept |
| Validity where I work | Unknown | Solicitor or lawyer to confirm |
When every row has an action or a finding, you have done what an AI and a few hours can do. What remains is a conversation with a qualified adviser, armed with a one-page sheet. That is a cheaper and quicker conversation than one that begins from the full contract.
The price side of the same contract is covered in what AI can and cannot check in an escalation clause, which uses the same quote-and-confirm approach.
Pay-when-paid questions subcontractors ask
Is pay when paid the same as pay if paid?
No. Pay-when-paid usually delays your payment until the contractor is paid, but you are still owed the money eventually. Pay-if-paid makes the contractor's receipt a condition, so if they are never paid you may never be paid. Courts and statutes treat the two very differently, and the rules vary by country and state.
Can AI tell me whether my clause is allowed?
No. AI can summarise the wording and highlight the timing and conditions, but whether a clause is allowed or enforceable depends on the rules where the contract is governed. A solicitor or lawyer should confirm that before you sign. Ask the AI for the list of questions to take to them instead of a verdict.
What payment period should I look for?
There is no single right answer, but look for a fixed outer date, such as payment within a set number of days of your invoice, whatever the client does. A clause with no outer date means your payment depends entirely on someone else's timing.
Can I stop work if I am not paid?
Some contracts and some local rules give a right to suspend after proper notice, and others do not. Check for a suspension right and its notice steps before signing, and never stop work without taking advice, because wrongful suspension can be a breach.
Further reads
- Pay Applications for Subcontractors: Schedule of Values With AI — Pay applications that start the payment clock on time.
- Construction Cash Flow Forecast: Build One in a Spreadsheet With AI — A fuller cash-flow forecast for the whole business.
- Can ChatGPT Draft a Subcontractor Agreement? Clauses to Check — Which subcontract clauses ChatGPT can draft and which to check.
- Construction Contract Review With AI: Which Clauses It Flags and Misses — What AI contract review flags and misses in construction.
- Can AI Review a Contract? What Small Business Owners Should Know — What AI contract review catches and misses in general.
- AI Scheduling for Small Builders: Subcontractors and Deliveries — Sequencing work affects when you can invoice.
- AI Payroll Checks: Catch Timesheet Errors Before Payday — Wages go out weekly while payment arrives later.
- AI Tools for Contracting Businesses: Subcontracts and Change Orders — A small contractor's routine for AI on subcontracts and change orders: a clause comparison, a date tracker, a priced draft and what a lawyer still reviews.
- Lien Waivers for Small Contractors: Track Conditional and Final Releases — A three-tab sheet that matches each conditional and final lien waiver to the payment it covers, with red-flag formulas and a worked HVAC example.
- Subcontractor Prequalification Questionnaire: Build and Score It With AI — A question set for insurance, safety, references, capacity and finances, a weighted scoring sheet, and tests that make AI scoring fairer before you act on it.
- AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.
Sources: the worked cash-flow figures and the sample clause are the author's own illustrations; the tutorial gives general information, not legal advice.