The Last Letter Before This Gets Expensive

Why does a letter work when six phone calls did not?

Because it changes the shape of the problem.

Phone calls live in one person's head. They are easy to put off, easy to misremember, and easy to treat as noise from a contractor who will eventually stop calling. A signed letter with an invoice schedule and a deadline is a document. It gets filed. It gets forwarded to a partner, a spouse, a bookkeeper or an insurer. It can be read in two minutes by somebody who was never on site, and it reads the same way in a courtroom as it does at a kitchen table.

It also moves you out of the category the payer has put you in. Slow payers sort the people they owe into two piles: the ones who chase and the ones who escalate. Everything about a demand letter, the format, the certified mail sticker, the specific date, says you are in the second pile. That is most of the effect, and it is why the tone should be flat rather than furious. Angry letters read as emotional and get discounted. Dull letters get paid.

The last thing it does is build the file. If this ends up in front of a judge or an agency, the question is never who was more frustrated. It is who can show what was agreed, what was delivered and what was asked for, with dates. A demand letter and its return receipt are the cleanest single exhibit a small contractor can produce.

How bad is the money problem in construction?

Bad enough that the whole industry prices for it.

Construction runs 83 days of days-sales-outstanding against roughly 60 days across all industries. 82% of contractors now wait more than 30 days to get paid, up from 49% two years earlier, which is a collapse in payment behaviour inside 24 months. Only 5% of subcontractors get paid on time. Rabbet put the cost of slow payment to the US construction industry at an estimated $280 billion in 2024. Contractors respond by inflating bids an average of 8% to hedge the delay, so everybody's price carries the cost of everybody else's paperwork.

The part that does not show up in industry totals is what it does to the individual shop. 1 in 3 subcontractors pull from personal or retirement savings to bridge the gap. US small businesses carry an average of $17,000+ in overdue invoices at any one time, and across US B2B, 43% of invoice value is overdue with about 5% eventually written off as bad debt. That 5% is not spread evenly. It lands on whoever did not build a file.

Electricians on the Mike Holt forum have been saying the same thing to each other for years, and it is more useful than most of the research: "Get paid before you leave the job site!" and "Once you leave without payment, your chances of getting paid go down to next to nothing." And the observation that stings: "It always seems that the people with money were the worst payers." Reply, from the same thread: "That's why they have money."

Sources: DocJoist 2026 construction payment report aggregating CreditPulse 2025, Rabbet 2024, CCFG Credit 2024, Built 2025 and Billd 2025 · Atradius 2025 US B2B Payment Trends and QuickBooks 2025 via Clockify's late-invoice statistics · Mike Holt electrician forum collections threads. Retrieved August 2026.

What has to be in a demand letter?

Ten things. Miss any of the first six and the letter is just an angry invoice.

1. Both addresses, properly laid out. Yours at the top, the payer's underneath, positioned for a window envelope. Address it to the person who signs checks, and to the registered business address if it is a company.
2. The date, because every deadline in the letter counts from it.
3. How you are sending it. A "VIA CERTIFIED MAIL, RETURN RECEIPT REQUESTED" line at the top tells the reader this is on a record before they get to the first sentence.
4. A reference to the agreement. Contract date, contract or PO number, the property address. This is what makes it a contract claim rather than an assertion.
5. Proof the work was done. What the work was, when it was completed, and who accepted it. Disputed completion is one of the three chokepoints that stop contractors getting paid.
6. An invoice schedule. Invoice number, invoice date, due date, amount, days past due, and a total. One line per invoice. A lump sum invites an argument about the whole number.
7. The interest, with the arithmetic. Only if your terms allowed it, and shown per invoice so it can be checked.
8. A specific deadline, as a calendar date rather than a number of days.
9. One named next step, stated plainly, that you are actually willing to take.
10. Payment instructions and a signature. Make paying you the easiest thing in the letter to do.

Two optional paragraphs earn their place more often than not. An offer to document a payment plan, which costs nothing and closes a surprising number of accounts. And an invitation to dispute the balance in writing before the deadline, with specifics, which makes the letter read as reasonable and strengthens your file whichever way they answer.

How do you work out the interest?

Only charge it if your contract or invoice terms said so before the work. A fee nobody agreed to is hard to enforce and it converts a payment conversation into an argument about the fee, which is the payer's preferred outcome. Where the terms do provide for it, 1.5% per month, which is 18% a year, is the standard defensible business-to-business rate in most US states. Caps vary a lot by state and between consumer and commercial work, so check yours before you rely on it.

The method this page uses is a monthly rate prorated by days: amount × rate ÷ 30 × days past due. Here is the sample loaded into the tool above, worked longhand against a letter dated August 8, 2026.

Principal is $6,480.00 + $3,215.50 + $1,940.00 = $11,635.50. Interest is $278.64 + $70.74 + $8.73 = $358.11. Total demanded is $11,993.61. And the number that does the quiet work at the bottom of the letter: at 1.5% a month the whole balance accrues $11,635.50 × 1.5% ÷ 30 = $5.82 every day it stays unpaid. Nobody enjoys watching a daily number.

Check the first invoice by hand if you like. 86 days is 2.8667 months. $6,480.00 at 1.5% a month is $97.20 a month, and $97.20 × 2.8667 = $278.64. The arithmetic prints on the letter for exactly this reason: a number the payer can verify is a number they stop arguing with.

What next step should you name?

Name one, name it plainly, and pick the one you will actually do. Here is what each of the four really means.

The fifth option in the tool states no specific step and reserves your remedies. It is the right pick when you have not decided, or when you want one more clean exchange before choosing. It is weaker, and that is a fair trade for not bluffing.

What does this letter do to your lien rights?

One practical note that follows from all of the above. If you do commercial or new-construction work, the time to think about lien rights is the week you start the job, not the week you give up on getting paid. Send the preliminary notice your state requires as routine paperwork on every job, the same way you send an invoice. It is not an aggressive act and nobody who works in commercial construction reads it as one.

What do the paid options cost in 2026?

Prices as of August 2026, and they move. The comparison worth understanding is that almost none of these companies charge for the words. They charge for delivery, for proof, for a lawyer's name, or for a subscription that includes hundreds of documents you will never open.

Sources: levelset.com demand letter and notice pages ($59 per recipient) · chaserhq.com detailed pricing breakdown · legalclarity.org LawDepot pricing summary and BBB Edmonton file · BBB San Francisco and ConsumerAffairs Rocket Lawyer files · DocuSign pricing via PandaDoc's competitor comparison, bias noted. All retrieved August 2026.

Where is this free version enough, and where is it not?

It is enough for a one-to-five person shop chasing a residential or small commercial balance where the facts are not really in dispute. The work got done, the customer stopped answering, and you need a document that says so properly. That is most unpaid invoices, and for that job this page produces the same letter a $59 service would send, minus the mailing.

It is enough for the second and third letters too, because the log keeps what you sent and when.

Where it stops entirely: a balance large enough that losing it would hurt the business deserves an hour of a local attorney's time before you send anything, because the cheapest legal advice is the kind you get before you act. Public projects, bonded jobs and anything involving a general contractor's payment bond run on their own claim procedures with their own deadlines, and those are not a letter-writing exercise. And if the payer has genuinely run out of money rather than genuinely refusing to pay, no letter changes that, and the fastest route is usually a written payment plan you can actually monitor.

How do you use it?

1. Fill in both address blocks. Yours, then theirs. Use the name of the person who signs checks and the registered business address for a company.
2. Point at the contract and the completed work. Contract date and number, job address, what the work was, when it finished, who accepted it.
3. Add every unpaid invoice with its date, due date and amount. Days past due and the totals compute against the letter date.
4. Set the interest to whatever your terms actually allow, or to none. The calculation prints on the letter.
5. Set the deadline and pick your next step. Ten to fourteen days, and a step you will take.
6. Print two copies, sign both, keep one. Mail the other certified with return receipt requested, and drop a plain first-class copy in the same box.
7. Calendar the deadline and file the receipts with your copy. If the date passes, do the thing you said.

What should you never put in a demand letter?

The fastest way to turn a strong collection case into a weak one is to write something you cannot stand behind.

• Never threaten criminal charges. Threatening criminal action to collect a civil debt is treated as improper in many states and it can hand the other side a defence, or worse. The debt is a business dispute. Keep it there.
• Never use a licence, a credit bureau or a public review to force payment. "Pay or I'll report you" is a different kind of letter, and not a good one.
• Never insult anyone, including their business, their character or their previous excuses. It feels excellent and it costs you the reader.
• Never state a next step you will not take. An announced deadline that passes with nothing behind it is worse than no letter, because you have now taught the payer exactly what your paperwork is worth.
• Never claim fees your contract never mentioned. Interest, collection costs and attorney fees all need a basis in the agreement.
• Never exaggerate the amount. One inflated line lets the payer argue about the number instead of paying it, and it is the first thing a judge notices.

Everything a demand letter needs to do it does with facts and dates. If a sentence would embarrass you if a judge read it out loud, cut it.

What should be in the file?

The letter is one exhibit. What makes it work is everything behind it, and most of it exists already if you have been generating documents rather than texting quotes.

• The signed contract or the signed estimate, and every signed change order.
• The invoices themselves, and the date each one was sent.
• Photos of the completed work, and photos of the conditions you found along the way.
• The reminder trail with dates, including screenshots of texts and copies of emails.
• This letter, the certified mail receipt with its tracking number, and the return receipt when it comes back.
• Dated notes of phone conversations, written the day they happened rather than three months later.

Keep it as one folder per job. When you need it you will need all of it at once, and the version assembled the night before a hearing is never as good as the one that was built as you went.

How do you stop needing this letter?

CompanyCam's research names three chokepoints that stop contractors getting paid, and every one of them happens before the invoice: unclear scope, undocumented change orders and disputed completion. Their conclusion is the sentence worth memorising: "Faster invoicing software cannot resolve a scope disagreement." The bottleneck is approval, not billing speed.

Which means the real fix is upstream and boring. Write exclusions into the estimate so the scope has an edge. Get a written change order signed before you do work that was added verbally, because the money you cannot prove was agreed is the money you end up writing a demand letter about. Take completion photos and get a sign-off at the walkthrough. Put a late fee, a payment schedule and a stop-work clause into the contract, and then actually stop work when a draw goes unpaid.

None of that is glamorous, and all of it is free. The contract generator, the change order generator and the estimate generator exist to make those three habits take five minutes each. This page exists for the jobs where you did everything right and somebody still decided not to pay you.

Common questions