An unpaid invoice doesn’t mean the client is refusing to pay. It often means your invoice got buried or routed to the wrong person. What it does mean is that you need to act, because waiting only makes collection harder.
Prepare your paper trail first
Before sending follow-ups, organize your records. Gather the original invoice showing payment terms, signed agreement, communication logs, and proof of delivery or open tracking. Documented records give follow-ups credibility and provide necessary evidence if you ever need to escalate legally.
Step 1: Send a same-day-after reminder
The moment a due date passes without payment, send a reminder. Don’t wait a week hoping the check is in the mail. A short message sent one day late is good practice.
Sample message:
Hi Sarah, just flagging that Invoice #1042 for $2,400 was due yesterday, May 26. Please let me know if you have any questions or if there is a different billing contact I should reach out to. Payment link: [link]
Note what is in that message: invoice number, amount, soft inquiry, and payment link. What is omitted: apologies or hedging.
Step 2: Follow up at 7 days overdue
If you don’t hear back within a week, send a second message:
Hi Sarah, following up again on Invoice #1042 ($2,400, due May 26). I haven’t received payment yet and wanted to check if there is a hold-up. Please let me know by Friday so we can resolve this.
Setting a soft deadline gives the client a prompt to act rather than deferring.
Most overdue invoices get paid after the first or second follow-up. The clients who genuinely won’t pay are a small minority, so start with the assumption that it is an oversight, not a refusal.
Offering a payment plan option
If a client expresses financial tightness, offer an installment plan before taking hostile steps. Ask: “Can you pay half now and the remaining balance next week?” Put the agreed schedule in writing with exact dates and amounts. This recovers money immediately while easing cash flow pressure for the client.
Step 3: Escalate at 30 days overdue
An invoice 30 days past due needs a firmer tone:
Try a different contact. Look up accounts payable or a senior manager. Finance teams process invoices that marketing teams lose.
Refer to your contract. Mention agreed payment terms, signaling readiness to enforce them.
State your next step. State clearly: “If payment is not received by June 15, a late fee will apply and we may refer this account to collections.”
Sample message:
Hi Sarah, I’m writing about Invoice #1042 for $2,400, which is now 30 days overdue. Per our agreement, a 1.5% late fee will be added starting today. Please reply with a payment date by June 15 or process payment via the link below.
Handling client disputes
If a client responds with objections, require them to state their specific dispute in writing, whether regarding scope, hours, or quality. Vague objections often evaporate once documented details are requested.
Step 4: Send a formal demand letter
If the 30-day message gets no response, send a formal demand letter by email and certified mail:
RE: Demand for Payment of Invoice #1042 in the amount of $2,400 Dear Client, You are indebted to [Business Name] in the sum of $2,400 for services rendered. This invoice was issued on May 27 with payment due May 26. Despite prior requests, this debt remains unpaid. I am demanding full payment within 10 days. If payment is not received by June 25, I will pursue remedies including small claims court and collections referral.
A formal demand establishes an official paper trail and signals imminent legal action.
Step 5: Pursue small claims court or collections
When written demands fail, choose between small claims court and collections agencies:
Small Claims Court: Ideal for invoices within your state’s limit ($5,000 to $25,000). Court filing fees range from $50 to $300, and proceedings take 30 to 90 days without requiring an attorney. Bring your contract, invoice, proof of work, email logs, and proof of service notice. Winning grants a legal judgment enforceable via wage garnishment or bank levies.
Collections Agency: A collections agency pursues recovery on your behalf using credit reporting and enforcement calls. Agencies charge a flat fee of $100 to $300 or keep 25 to 50 percent of recovered funds. Use this for larger overdue balances when partial recovery is better than total loss.
Knowing when to walk away
Some unpaid invoices are not worth chasing. If an invoice is under $500, past 60 days overdue, and the client is uncooperative, absorbing the write-off is wiser than prolonged stress. Use the experience to tighten future client screening, require upfront deposits, and enforce clear payment terms.
Preventing overdue invoices
The most effective collection strategy is preventing late payments:
- Shorter payment terms. Net 7 or Net 14 pays faster than Net 30.
- Deposits upfront. Requiring 25 to 50 percent upfront reduces exposure.
- Clear late fee language. Clients who know penalties exist pay on time.
Waco3 notifies you the moment a client opens your invoice, so you know they’ve seen it. If an invoice goes unread for days, that is your signal to follow up before it becomes overdue.
Ready to send stronger proposals?
Build, send, and track proposals in one place so follow-up is easier.
Start your free trial →
