Client Won't Pay Invoice: Five Steps Before You Spend

Almost every article about a late invoice starts from the assumption that somebody has decided not to pay you. In my own file of forty-odd late ones, that was true of only a handful. The rest were invoices that got somewhere inside the client's company and then stopped — a producer's inbox, a supplier portal nobody submitted them to, a purchase order number typed with one digit wrong.

Which is exactly why "send a firmer reminder" is bad advice at day 30. The person who hired you may never have paid an invoice in their working life. Being firmer with them changes nothing. They are not the obstacle.

So the order below runs on the calendar rather than on how annoyed you are, because the calendar is what actually decides which options are still open. At day 30 all of them are, and none of them cost anything. By day 90 the free ones are behind you and what is left costs money, time, or the client. I am not a lawyer and none of this is legal advice; what this site does and does not do is set out separately. Every rule and price below is linked to the page it came from, with the day it was checked beside it.

First, work out whether this is refusal or routing

Around day 30, before you write a word to the client, spend half an hour building a file that answers four questions. You will use it at every rung after this one, and if the thing ever reaches a courtroom it is most of your case.

When did the clock start? Not the date you sent the invoice. The date your contract says payment becomes due — on receipt, on delivery, on acceptance, on the client's approval of the invoice. If the trigger is acceptance and nobody ever accepted anything in writing, the debt may not technically be late yet, and that changes what you can reasonably say.

Did the invoice enter their system? Ask for the invoice number their system assigned, not yours. If there is a purchase order, does your invoice quote the PO number exactly, including leading zeros? If they use a supplier portal, was the invoice submitted in the portal or emailed to a human who has no idea the portal exists? A no on any of these is a routing failure, and routing failures are fixed in a day.

Who signs the cheque? The person who briefed you is rarely the person who approves payment. Somewhere there is an accounts payable address, usually of the form ap@ or invoices@ or payables@, and a manager who owns the budget line.

What does the paper actually say? Payment clause, acceptance clause, any late fee provision, and whether there is a notice provision naming an address where formal notices have to be sent. That last one matters later; a demand posted to the wrong address is a demand you may have to send twice.

Public bodies are the one class of client where two of those answers are already published. To avoid late payment penalties California allows its own agencies 45 calendar days from receipt of an undisputed invoice (Government Code 927.4), and prices lateness by who is owed: 10 per cent above the prime rate on 30 June of the prior fiscal year for a certified small business, against 1 per cent above the Pooled Money Investment Account rate for everyone else (927.6, both read on 18 August 2026). The word carrying the weight there is undisputed. If you invoice a city, a school district or a state university, that state's prompt payment chapter is where both the deadline and the test for stopping it are written down.

The resend that fixes plumbing, not tone

If that file turned up a routing problem — and in my spreadsheet it usually did — the message you send around day 35 is not an escalation. It is a correction, and it should read like a favour.

Reissue the invoice with whatever was missing — the PO number, the cost centre, the entity name exactly as it appears in the contract rather than the trading name on their website. Send it to accounts payable, copy your contact, and state in one line what changed and what the original invoice date was. Keep the original date. You are not restarting the clock, you are correcting a document, and quietly redating it is how a genuine 45-day debt turns into a fresh one in their system.

Then ask for one thing: confirmation that the invoice is in the queue and the date it is scheduled for payment. That question is harder to ignore than "any update?" because it has a factual answer that somebody can look up in twenty seconds.

Cost: an hour. Elapsed time before you get to be annoyed again: about ten days.

The first message with a date in it

By about day 45, assume the plumbing is fine and the money is not coming on its own.

This is a short written message, sent by email, addressed to your contact and to accounts payable, with a named manager copied. Not a lawyer's letter. It contains: the invoice number and date, the work it covers, the contract or PO it was performed under, the amount, the number of days past the contractual due date, and a specific date by which you are asking for either payment or a scheduled payment date. Two weeks out is normal.

Three things this rung is really doing. It moves the matter from your contact's inbox, where it is one of four hundred, to a person whose job is affected by a supplier chasing them. It creates a dated record of a demand, which is the thing every later step is built on. And it tells you, from the response or the silence, which of the remaining rungs you are on.

Read the reply carefully, because the useful information is in the wording. "It's in the payment run for the 30th" is a routing answer and you are nearly done. "We're waiting on sign-off from the client side" means an approval step you were never told about. Silence after a message that named a manager is the strongest signal on this whole ladder that you are heading for rung four.

Asking in writing has a second life later, past whatever it does to this month's cash. California's small claims guidance treats the request as the step before the courthouse — you ask the person for what you want, and once you have asked, you can file (California Courts self-help, read on 18 August 2026). Other states word it differently and some say nothing about it at all, but a dated message naming a sum is the cheapest available answer to a judge asking what you did before filing.

Writing a demand letter you can prove arrived

Somewhere near day 60, the demand letter is the last thing you send before the matter stops being private between the two of you. It should be dull, specific, and posted on paper as well as emailed.

Contents: the parties by their legal names, the agreement and its date, what was delivered and when, the invoice and the sum outstanding, the fact that payment is now overdue by a stated number of days, a deadline typically of ten to fourteen days, and one sentence on what you will do if the deadline passes. Attach the invoice and the contract. If your contract has a notice clause with an address, use that address as well as the accounts payable one.

Send it so that you can prove it arrived. Through USPS, Certified Mail costs $5.55, an electronic Return Receipt adds $2.91 and the paper green card $4.65, and a plain Certificate of Mailing — proof you sent it, not proof they received it — is $2.45, plus postage (usps.com extra services, read on 16 August 2026). Certified with an electronic return receipt is the sensible default: $8.46 of extra services on top of the ordinary postage, and it converts "we never got it" into a signature.

Now the part that gets people into trouble. Three things do not belong in that letter, and the first one is the one people reach for when they are angriest.

• Any threat of criminal consequences. Not paying an invoice is a contract matter. Telling a client you will report them for theft or fraud unless they pay is how a legitimate debt turns into a conversation about your state's extortion statute. Leave it out entirely.
• Going around the company to its customers, its other freelancers, or the internet. Pressure applied through third parties invites a defamation counterclaim, and in some states worse than that. It also ends any chance of the quiet payment you actually want.
• A deadline you have no intention of enforcing. "I will file suit on Monday", from somebody who will not file on Monday, is the most expensive sentence on this page. It teaches the client that your letters are weather.

The federal Fair Debt Collection Practices Act mostly does not reach this letter. It defines "debt" as a consumer obligation incurred primarily for personal, family, or household purposes, and it separately excludes a creditor collecting its own debt in its own name (15 U.S.C. 1692a, read on 16 August 2026). For an unpaid business invoice chased by the business that issued it, both of those point the same way.

Treat that as a technical fact rather than as permission, and do not extend it further than it goes. It is commonly assumed that the Act switches on the moment a collections agency takes the file over. The consumer-purpose limit in that definition attaches to the debt, not to whoever is chasing it, so a genuine business-to-business invoice tends to sit outside the Act either way; what actually constrains an agency is state collection-agency licensing law and the contract it signs with you. What constrains you is a different list — your state's own collection and extortion statutes, and the ordinary law of defamation.

Four numbers decide what happens next

Past the demand letter there is no next email. What is left is a choice between court, a collections agency, a statutory complaint where one exists, and writing the thing off — and which of those is genuinely open to you is arithmetic more than temperament. Around day 75, work out four numbers.

The amount, measured against your state's small claims ceiling. The ceilings are nowhere near uniform. In California an individual may sue in small claims for less than $12,500, while a business entity is capped at less than $6,250, and the filing fee runs $30 for claims up to $1,500, $50 up to $5,000, and $75 up to $12,500, with a higher rate for anyone filing more than twelve small claims cases in twelve months (California Courts self-help, small claims and filing, read on 16 August 2026). Your state's numbers will differ, sometimes by a factor of two, and so will the rules on who may appear for a company. Find your own state courts' self-help pages before you assume anything from the Californian figures.

Whether you can name them and serve them. You are suing a legal entity, not a brand. Pull the exact registered name and the registered agent's address from the business search run by your state's Secretary of State, or by whichever office registers companies there, and check it against the name on your contract. If those two do not match, sort it out before filing rather than after.

How much time is left on the clock. Limitation periods vary by state and by whether the agreement was written. California gives four years on a written contract (Code of Civil Procedure 337, read on 16 August 2026). Yours may be shorter. This number is the reason drifting is a decision.

Whether there is anything there to collect. A judgment is a piece of paper stating that you are owed. Turning it into cash is a separate process with its own filings. If the client is a dissolved LLC with no assets, winning changes nothing.

Then there is a fifth question that applies only in a handful of places, and it is worth the two minutes because where it applies it is free. Some states and cities now require a written freelance contract and payment by a deadline. Illinois covers contracts taking effect after 1 July 2024 where the work is worth $500 or more in a 120-day period, and requires payment by the contract's due date or, if none is stated, within 30 days of completion (820 ILCS 193; Illinois Department of Labor, Freelance Worker Protection Act, read on 16 August 2026). New York added Article 44-A to the General Business Law effective 28 August 2024, and the state Department of Labor directs freelance workers to complain to the New York State Attorney General rather than to the department (NYS DOL, read on 16 August 2026). Most states have nothing of the kind. Check where your client is, not where you are, and confirm the current text on the agency's own page — this area of law is four years old and still moving.

Writing it off belongs on the list of exits as a real option, not as a failure. A $600 invoice that would need two half-days of your time, a filing fee, and a hearing you have to travel to has a recovery cost approaching the debt itself. The correct response to some invoices is to stop, note the client's name somewhere you will see it again, and go and earn the money elsewhere.

One thing a write-off is not is a deduction. Business bad debts can be deducted only where the amount was included in gross income, and the IRS states that a cash method taxpayer — which most sole traders are — generally cannot take a bad debt deduction for unpaid fees (Topic no. 453, read on 18 August 2026). Money that never arrived was never income, so there is nothing to write down and no relief coming in April. What is left is counted in hours, which is the honest unit for deciding whether to spend more of them.

The ladder on one screen

None of these rungs is there to express displeasure. The first two exist because most late invoices are administrative rather than adversarial, and the third because a file sitting with somebody who cannot pay it will sit there forever. The fourth builds the record every later step is constructed on. The fifth exists so the matter ends — paid, filed, or written off — on a date you picked instead of one you drifted into.

Where this stops being something you do yourself

If the client disputes the quality or scope of the work rather than the timing of the payment, if the amount is above your state's small claims ceiling, if there is a signed agreement with an arbitration clause or a venue in another state, or if anyone has started talking about counterclaims — that is the point to pay for an hour with a lawyer licensed where the case would be heard. An hour spent before filing is cheaper than a filing made in the wrong forum. If something on this page is out of date or wrong in your state, tell me and it gets fixed and dated.

All of it hangs on a single date. Somewhere in the contract is a sentence saying when payment actually becomes due, and until you have read that sentence you do not know which rung you are standing on — you are guessing from the day you sent the invoice, which is rarely the same day and is sometimes weeks out. It is the one thing on this page nobody has to give you permission to check.