How to collect payment from customers: a plumber's guide to getting paid

A finished job isn't finished until the money is in your account. For a small plumbing shop, one unpaid water heater can wipe out a week's profit, and chasing it eats evenings you don't get paid for.

This guide covers the habits that get you paid on the day, what each way of paying costs you, how to word reminders when a customer is late, and what to do when reminders don't work. Laws on late fees, small claims and liens differ by state, so treat the legal parts as a list to check, not legal advice.

Get paid on the day: four habits

1. Put the payment terms on the quote

The customer should know when and how they will pay before they say yes. One line on every quote does it: "Payment is due when the work is complete. We accept cash, check, card, Zelle and Venmo." If you take a deposit, say how much and when the rest is due. A signed line is harder to argue with than a spoken one. Our estimate template has a space for them.

2. Take a deposit on big jobs

On a repipe, a sewer line or anything with special-order parts, a deposit covers your materials and confirms the customer is serious. Check your state's rule before you set the amount. California, for example, limits the down payment on a home improvement contract to 10 percent of the contract price or $1,000, whichever is less, with an exception for contractors who hold a blanket performance and payment bond (CSLB). For bigger jobs, tie the rest to stages you can see: rough-in passed, fixtures set, final inspection.

3. Take payment before you leave

The best time to get paid is right after the customer sees the problem fixed. Show them the work and the invoice, and ask plainly: "How would you like to pay today?" An invoice emailed tonight competes with every other bill they have. If you charge a trip fee and the customer declines the work, collect that before you leave too; our service call fee guide covers how to say it.

4. Make the invoice impossible to misread

A clear invoice gets paid; a vague one gets questions. Put the quote number on it, describe the work in plain words, list each item, and show any approved change on its own line. Our plumbing invoice template has the full checklist.

What each way of paying costs you

Fees below are the published standard rates, checked on each company's own pages on October 7, 2026. They change, and your bank or processor may offer you a different deal. The last column is the fee on a $400 job, worked out from those rates.

Stripe also lists a 1.5% surcharge for international cards, and Stripe Invoicing charges 0.4% per paid invoice, capped at $2. Square's paid plans have lower card rates than the Free plan shown here. If you want to pass card fees on to customers, check your state's law and your processor's rules before you do.

Two rules worth knowing before you take app payments:

• Venmo: Venmo's user agreement says personal accounts may not be used to conduct business transactions with other personal accounts. To be paid for goods or services, you need a business profile, or the buyer has to mark the payment as goods and services. Venmo's fee page lists 2.99% for goods and services payments to a personal profile.
• Zelle: Zelle says your bank or credit union has to offer Zelle for your business account type, and that fees and limits are set by your bank. Ask your bank both questions before you print Zelle on your invoices, so a customer doesn't hit a limit at the door.

Whatever you accept, list every method on the quote and the invoice, with who to make a check out to and the exact Zelle email or phone number.

Plumbo, now on the App Store and Google Play, turns a voice note into a quote from your own price book. The customer signs on your phone, the invoice is one tap away, and you record each payment as it comes in: cash, check, card, Zelle or Venmo. Plumbo doesn't process payments; you keep your own card reader and bank. Try the 60-second demo →

When the customer doesn't pay: a reminder sequence

Most late payers simply forgot. Assume that first. Send short reminders on a fixed schedule, counting from the invoice date, and firm up the tone a little each time. Adapt this sample wording:

Send each reminder in writing, even if you also call, and attach the invoice every time. If it ends up in court, you'll want the record. Offer a payment plan before you mention court, and only mention court if you'll actually file.

Late fees: only if they were agreed first

A late fee works when the customer agreed to it before the work started, in writing, on the quote or contract. Adding one after the fact usually starts an argument you won't win. The amount you can charge, and whether it counts as interest, depends on your state's law, and some states have extra rules for consumer and home improvement contracts. Check with your state's consumer protection office or an attorney before you put a percentage on your paperwork.

When to stop work

On a multi-day job with stage payments, a missed payment is your signal. If your contract says work pauses when a payment is late, tell the customer in writing, before you stop, which payment is missing and when you'll return once it's paid. Leave the house safe and usable: water back on, no open drains, no loose gas work. Walking off without notice can turn a payment dispute into a complaint about you. If your contract doesn't cover this, add a clause; our plumbing contract template has one.

Small claims court

For a typical residential plumbing bill, small claims court is the usual next step. It's built for people who represent themselves, and the limits are high enough to cover most service work. Each state sets its own limit, and some set a different one for businesses:

Read your state's page to see which limit applies to you; it can depend on how your business is set up. For other states, search for your state court system's self-help site. Bring the signed quote, the invoice, photos of the finished work and every reminder you sent. Winning a judgment and collecting it are separate steps, one more reason to get paid on the day.

Mechanics' liens

Every state gives contractors some form of lien on the property they improved, often called a mechanics' lien. A recorded lien sits on the property's title, which makes it hard for the owner to sell or refinance until you're paid. The catch is the paperwork: each state has its own notices and strict deadlines, and missing one can make the lien invalid.

California shows how tight the rules can be. According to the Contractors State License Board's homeowner guide to mechanics liens:

• The prime contractor, who contracts directly with the owner, doesn't send a preliminary notice to the owner, because a Mechanics Lien Warning is required to be part of the contract. Subcontractors and suppliers do have to send one.
• A lien must be recorded within 90 days of completing the work (or of the owner starting to use or accepting it). If the owner records a Notice of Completion, a prime contractor has 60 days.
• The lien and a Notice of Mechanics Lien must be served on the owner, or the lien is unenforceable.
• A lawsuit to foreclose the lien must be filed within 90 days of recording it.
• An unlicensed person can't foreclose on a lien for work valued over $500.

Other states use different deadlines, notices and forms. Before a big job, look up your state's lien law or ask a construction attorney, so any notices go out on time. Remember that the clock starts when you finish the work, not when you give up on the customer.

Sources

• Square, Our fees (Free plan rates: in person, online and invoices, keyed in, ACH on invoices), checked October 7, 2026.
• Stripe, Pricing (online, in-person, manual entry, international, ACH Direct Debit, Invoicing), checked October 7, 2026.
• Venmo, Our fees (business profile and goods and services fees), checked October 7, 2026.
• Venmo, User Agreement (personal accounts and business transactions), checked October 7, 2026.
• Zelle, Using Zelle with a small business account (bank eligibility, fees and limits set by your bank), checked October 7, 2026.
• Contractors State License Board, What should I look for in a contract and binding agreements? (down payment limit), checked October 7, 2026.
• Contractors State License Board, A Homeowner's Guide to Preventing Mechanics Liens (PDF: notices, deadlines, foreclosure), checked October 7, 2026.
• Judicial Branch of California, Small claims in California ($12,500 and $6,250 limits), checked October 7, 2026.
• Texas State Law Library, Small Claims ($20,000 limit), checked October 7, 2026.