How to Bill a Customer Who Won't Pay

You finished the job three weeks ago. Customer was happy — or at least said they were. Signed the work order. You sent the invoice. Net 15. Then net 30 came and went. You sent a polite reminder. Nothing. Another two weeks. Nothing. Now it’s been 60 days and the customer either won’t answer the phone or has stopped responding to texts.

This is the part of running a trades business nobody warns you about. You do honest work, the customer enjoys the result, and then they just... don’t pay. The invoice sits on your books getting older. You start running the math on whether it’s worth chasing or whether you should just write it off and move on.

This is the real playbook. Every step in order, what each one costs, what each one actually accomplishes, and when to stop.

The 30-second framing question

Before you do anything, answer this honestly: do you actually want the money, or do you want them to suffer?

The answer changes your strategy. If you want the money, the goal is to collect with the least friction and time spent. That usually means a calm, professional demand letter and a willingness to negotiate. If you want them to suffer, the goal is to inflict maximum legal and financial damage, which is satisfying but expensive and slow.

Most trades owners want the money. They’re busy, they have other jobs to do, and an unpaid $800 invoice isn’t worth six months of court time. Keep that in mind through every step below.

The escalation ladder

Five rungs, in order. Skipping rungs costs you money. Each one has a specific purpose and a specific cost.

Rung	Cost	Time	Success Rate
1. Friendly reminder	Free	5 min	~30%
2. Formal demand letter	Free–$50	30 min	~40%
3. Mechanics lien (if eligible)	$50–$300	2–4 hrs	~60%
4. Small claims court	$30–$200	2–6 mo	~70% to win, ~40% to collect
5. Civil court / collections	$500–$5K	6–18 mo	~50% to win, ~30% to collect

Notice the gap between “winning” and “collecting.” You can win a judgment and still never see the money. A judgment is a piece of paper saying you’re owed; collecting it from someone who doesn’t want to pay is a separate fight.

Rung 1: The friendly reminder

Day 31 after invoice. The first move is a short, neutral nudge. No accusations. No threats. Treat it like the customer just forgot, because about a third of the time, they actually did.

Send by email. If you have their cell, also send a text version. Don’t call yet — phone calls feel confrontational and put people on the defensive. Email and text give them a written record they can act on in their own time.

Wait 7 days. If no response, send one follow-up. Same tone. Don’t escalate yet.

Rung 2: The formal demand letter

Day 50 or thereabouts. Now you escalate the tone but not the content. The demand letter is the most underrated tool in collections. It costs you nothing, takes thirty minutes to write, and resolves a startling percentage of unpaid invoices on its own.

Why it works: most non-payers are not deadbeats. They’re stressed, embarrassed, ducking calls, or hoping you’ll just forget. A formal demand letter on letterhead, sent certified mail, signals two things to them — you’re organized, and you’re prepared to escalate. That’s usually enough.

The letter must include:

• Your company name, address, and contact info at the top
• The date
• The customer’s name and address
• A clear, factual recap of the job, invoice number, original due date, and amount owed
• A specific new deadline (10–14 business days from the date of the letter)
• A statement that if payment is not received by that date, you will pursue further remedies including, where applicable, filing a mechanics lien, small claims action, or referral to collections
• Your signature

Keep the tone professional. No insults. No emotional language. Don’t threaten things you won’t actually do. Empty threats discredit you and may also violate the federal Fair Debt Collection Practices Act consumerfinance.gov if you start using language that could be interpreted as harassment.

Send by certified mail with return receipt requested through USPS usps.com ($5–$8). Also send a copy by regular email. The certified mail receipt is your proof in court that they received the demand — this matters later if you escalate.

Rung 3: Mechanics lien (the one most trades owners don't know about)

This is the single most powerful tool in your collections toolkit and most owners never use it because they think it’s only for construction work. It’s not. Mechanics liens are available to almost anyone who provides labor or materials that improve real property — and in many states, that includes HVAC repairs, electrical work, plumbing, locksmith work on the building itself, garage door installs, appliance installations, and more. Service-only work (you came, you fixed something, you left, nothing was permanently attached or installed) typically does not qualify. But anything that involves installing, replacing, or improving a fixture usually does.

Every state’s lien laws are different. Some states require pre-lien notices within 30–75 days of starting work. Texas, for example, has a specific Pre-Lien Notice process under Chapter 53 of the Texas Property Code texas.gov. California has its own process through the Civil Code saclaw.org. New York, Florida, Illinois — all different.

What a mechanics lien actually does: it ties your unpaid invoice to the property itself. The customer cannot sell, refinance, or transfer title until the lien is satisfied. Most banks, title companies, and real estate agents will not touch a property with an open lien. This creates massive financial pressure on the property owner to settle.

Filing costs typically $50–$300 depending on the state, paid to the county recorder’s office. You can file it yourself in most states without a lawyer, though for amounts over $10,000 a real estate attorney is worth the $400–$800 to make sure the lien is enforceable.

Important deadlines: liens must usually be filed within 60–120 days after your last day of work, depending on state. Wait too long and you lose the right entirely. This is the #1 reason owners miss out — they wait, hope, send another reminder, wait some more, and by the time they’re ready to act, the lien window has closed.

One real example of how powerful this is: a contractor in Minnesota who follows the rules can have their mechanics lien survive even if the customer files Chapter 7 bankruptcy. In most other unsecured creditor situations, the customer’s bankruptcy wipes you out. With a properly filed mechanics lien, you’re a secured creditor — you keep your claim against the property even when the debt itself gets discharged.

For service-only work that doesn’t qualify for a mechanics lien (a locksmith opening a lockout, an HVAC tech doing a tune-up with no installed parts), skip to Rung 4.

Rung 4: Small claims court

For amounts under your state’s small claims limit — usually $5,000 to $12,500 — this is the right escalation. No lawyer needed. Filing fees are typically $30–$200. Hearings are scheduled 30–90 days out. Decisions are usually issued the day of the hearing.

Small claims court is designed for people without lawyers. You walk in, you tell the judge what happened, you show your evidence, the customer tells their side, the judge decides. The whole hearing usually takes 15–30 minutes.

What to bring:

• Original signed work order or service authorization
• Original invoice and any subsequent invoices
• Copies of all reminders sent (email, text, demand letter)
• Certified mail receipt from the demand letter
• Photos from the job (before/after if applicable)
• Any text messages or emails from the customer acknowledging the work was completed
• Your business license and any required trade licenses (some judges check)

The strongest evidence in small claims is contemporaneous documentation — records created at the time of the job, not reconstructed later. A timestamped photo of the completed work taken at 4:12 PM on the day of the job is worth ten times a written description from memory three months later. This is why trades businesses with proper field service software win these cases at a much higher rate — every job has a digital paper trail from the moment it starts.

Show up on time, dress neatly, be polite to everyone including the customer. Speak only when the judge asks. Stick to facts: what work, what was agreed, what was paid, what is owed. Don’t insult the customer, don’t exaggerate. Judges deal with both sides exaggerating constantly and reward the side that comes across as reasonable.

Winning is not collecting

If you win, the judge issues a judgment. The judgment is a court order saying the customer owes you the money. The court does not collect for you. Collecting on a judgment is a separate process — you can garnish wages (in most states), levy bank accounts, place a judgment lien on real property, or have the sheriff seize property to satisfy the debt. Each of those is another step that takes time and money.

About 40–50% of small claims judgments are never actually collected. The customer disappears, has no assets, files bankruptcy, or just refuses and you can’t find them. Factor this into your decision before filing.

Rung 5: Civil court and collections agencies

For amounts above small claims limits, you’re in real civil court. This means a lawyer ($150–$400/hour), filing fees ($300–$500), and a process that takes 6–18 months. Realistically not worth it unless the unpaid amount is at least $10,000–$15,000 and the customer has demonstrable assets.

Collections agencies are the other path. They typically take 25–50% of whatever they collect, but you don’t pay anything upfront. Their success rate on small B2C invoices is mediocre — 15–25% — but they do the work so you don’t have to. Commercial collections agencies that work B2B invoices are more effective on commercial accounts (60–70% success on solid claims).

Reputable collection agencies are licensed in your state. Check with your state attorney general’s office naag.org before signing with any agency. The collections industry has a high rate of bad actors, and signing with one who violates the FDCPA can expose you to liability for their actions.

The math: when to write it off

Sometimes the right answer is to stop chasing. Here’s a rough decision tree:

Under $200: Write it off. The time spent on collections is worth more than the money. Send the demand letter on principle if you want, but don’t file anything.

$200–$1,000: Demand letter is usually the right end of the line. If it doesn’t work and you can’t file a mechanics lien, accept the loss.

$1,000–$5,000: File the lien if eligible. If not, small claims court is worth it if you can confirm the customer has a fixed address and likely a job. Skip if the customer is a transient or you can’t locate them.

$5,000–$10,000: Lien plus small claims, full process. Worth pursuing aggressively.

$10,000+: Lawyer. Real lawsuit. Pursue completely, including post-judgment collection actions.

Document the write-off properly — it’s a tax deduction. Bad debt from a service business is generally deductible as an ordinary business expense in the year you write it off, provided you can show you made reasonable collection efforts. Keep the demand letter, any responses, and your records. Talk to your accountant.

How to (mostly) prevent this in the first place

The owners who barely ever deal with this aren’t lucky — they have systems that filter out non-payers before the job starts.

Take payment at the time of service. The single biggest predictor of getting paid is how much time passes between “job complete” and “invoice sent.” In-field card processing closes that gap to zero. Field service businesses using Stripe Connect-based mobile payments collect 95%+ of revenue at the door. Businesses that invoice net-15 or net-30 collect 70–85% on time and chase the rest.

Require a deposit on jobs over $X. Set a threshold based on your average job. For most residential trades, requiring 25–50% down on jobs over $500 eliminates the worst customers (the ones who never intend to pay) because they won’t put any money down.

Get a signed authorization before work starts. Verbal “yeah go ahead” doesn’t survive court. A signed work order with the customer’s name, the agreed price, and the scope of work is your foundation for every collections step. A digital signature on a phone with timestamp and IP address is even better.

Use clear pricing. A huge percentage of payment disputes start with price shock — the customer didn’t realize what the final number would be. Quoting in writing before work starts (with clear add-ons for after-hours, parts, etc.) prevents the “I didn’t agree to this” defense. Pricing communicated clearly is the cheapest collections insurance you can buy.

Document everything photographically. Before-and-after photos with timestamps from your dispatch app, captured automatically as part of every job, give you airtight evidence if anything ever goes to court.

Run a quick check on commercial customers. For B2B work, a 30-second Google search and a check of the company’s state filings (most state Secretary of State sites are free) tells you if they’re an active legitimate business. Walk away from new commercial customers with a history of judgments against them.

Things that look smart but make things worse

A short list of common mistakes:

Posting the customer’s name on social media or your reviews. Public shaming is satisfying for about ten minutes and then exposes you to a defamation counter-suit. Don’t do it.

Threatening to ruin their credit personally. You don’t report to credit bureaus. Only collections agencies and certain commercial credit reporters do. Threatening this is empty and may violate FDCPA-equivalent state laws if interpreted as harassment.

Re-locking, re-disabling, or going back to undo the work. If you installed something, ripping it out (especially without permission) opens you to civil and potentially criminal liability for trespass or property damage. A judge will find against you and the customer’s lawyer will eat you alive.

Going to the customer’s home repeatedly. Once the demand letter is sent, all further contact should be through written channels. Showing up at their door looks like harassment — even if your intent is just to collect — and gives them an angle to file a counter-complaint.

Continuing to do work for a non-payer. If a commercial customer is 90+ days past due on one invoice, stop taking new jobs from them. Trades businesses bleed out by giving repeat business to slow payers, hoping “the next one will pay.” It won’t.

The longer game

Every trades business gets stiffed eventually. The owners who handle it well don’t do anything magical — they just have the system in place before they need it. Standard demand letter template ready to fire. Knowledge of their state’s mechanics lien deadlines. A local small claims court they know how to file in. An accountant who knows how to write off bad debt.

Build those before you need them. The first time you have to do collections shouldn’t be the first time you’ve thought about the process.

And remember the framing question from the top: do you want the money, or do you want them to suffer? The answer should usually be the first one. Run the playbook calmly, escalate methodically, and don’t let an unpaid invoice take up more emotional bandwidth than it’s worth. The next ten paying customers are out there waiting. Don’t spend three weeks angry about the one who didn’t.