By Paras Saini & Shubham Sharma ·
How to Chase Unpaid Invoices: The Step-by-Step System
The invoice was due a week ago. You sent one reminder. Nothing. Now what? Most freelancers either wait too long, send the same polite email repeatedly, or jump straight to threatening language that backfires. This guide gives you the exact escalation system — timing, tone at each stage, which channels to use, and what to do when a client goes completely silent at 45+ days.
Key takeaways
- Start chasing within 24–48 hours of the due date — every day you wait signals that late payment has no consequences.
- 5-stage escalation: friendly (Day 1–2) → neutral (Day 7) → firm with deadline (Day 14) → escalation warning (Day 30) → final notice (Day 45–60).
- Email first — it creates a paper trail. Add phone calls after 2–3 unanswered emails.
- Log every follow-up with date and tone; this documentation is essential if escalation reaches small claims.
- A client who opens your email but doesn't respond has chosen not to act — escalate immediately, don't wait for the next interval.
The 48-Hour Window That Changes Everything
Send your first reminder within 24–48 hours of the due date. Not when you remember. Not after you've seen what happens. The day after the due date — allowing one business day for bank clearance.
Here is what the data says: invoices chased within 48 hours of the due date have significantly higher collection rates than those where follow-up is delayed a week or more. According to BACS Payment Schemes, UK businesses are owed £23.4 billion in late B2B payments — and the Atradius Payment Practices Barometer (2024) found 55% of UK B2B invoices experience late payment, making systematic chasing a business necessity rather than an imposition. The project is recent, the deliverable is fresh, and the client's awareness of the obligation is highest. A week of silence trains the client that your invoices can be deprioritized without consequence.
UK businesses also have a practical legal reason to act promptly: statutory interest under the Late Payment of Commercial Debts Act 1998 accrues from the first day overdue — the sooner you act, the sooner that clock is documented.
Step-by-Step Escalation
Follow a clear escalation ladder so you never skip steps or over-escalate too soon.
- Day 0 (due date): Polite reminder—invoice due today, here are the payment details.
- Day 1–2: First follow-up—assume it was overlooked, restate amount and methods.
- Week 1: Friendly but direct—check in, ask if anything is blocking payment.
- Week 2: Firmer tone—set a deadline, mention late fees if applicable.
- Day 30: Escalation warning—late fees, consequences, response required.
- Day 45–60: Final notice—last chance before legal or collections.
- After 60 days: Demand letter, small claims, or collections agency.
Use the free follow-up schedule planner to generate a chase schedule based on your due dates. It outputs PDF/CSV so you can plan ahead and stick to the timeline. See payment reminder email templates for copy-paste text at each stage.
Need to track which stage each invoice is at?
As your escalation ladder grows, so does the complexity. Who got a friendly reminder? Who needs a firm follow-up? Who's 45 days overdue with no response?
InvoiceGrid shows you exactly which invoices need chasing today, generates the next reminder, and logs every follow-up automatically.
Communication Channels
Email first
Email is the default for chasing unpaid invoices. It creates a paper trail, is non-intrusive, and gives the client time to process payment. Always include invoice number, amount, due date, and payment instructions.
Phone when email fails
If you've sent 2–3 emails with no response, a phone call can break through. Some clients ignore email but will answer a call. Document the call—date, time, who you spoke to, and what was said.
Avoid public channels
Don't chase via LinkedIn DMs, Slack, or social media unless that's your normal client communication. Public or semi-public channels can feel embarrassing and damage the relationship. Stick to email and phone.
Tone Progression
Start friendly and professional. Escalate tone only as the invoice ages and the client fails to respond.
- Friendly: "Just a quick reminder—invoice may have been overlooked."
- Neutral: "Invoice is overdue. Please process payment by [date]."
- Firm: "Payment is required by [date] to avoid escalation."
- Final/Escalation: "This is the final notice before legal action."
InvoiceGrid's reminder generator produces email text in five tones—friendly, neutral, firm, final, and escalation—so you can match the right tone to the right stage.
What If They Still Don't Pay?
If you've followed the escalation ladder and the client still ignores you, you have options.
Send a formal demand letter
A written demand letter states the amount owed, a deadline (e.g., 7 days), and your intent to take legal action. Send it via certified mail for proof of delivery. Many clients pay once they see you're serious.
Small claims court
For amounts within your jurisdiction's limit (often $5,000–$25,000), small claims is cost-effective. You typically don't need a lawyer. Bring your contract, invoices, and all chase history documentation.
Collections agency
For larger sums or when you don't want to go to court, a collections agency can pursue the debt. They usually take a percentage (25–50%). Choose one that works with freelancers and small businesses.
Heading to collections or court? You'll need documentation.
If a client still hasn't paid after multiple reminders, your next step requires proof — dates of every chase attempt, what was said, and the original invoice terms.
InvoiceGrid shows you exactly which invoices need chasing today, generates the next reminder, and logs every follow-up automatically.
Legal Options
Before going legal, ensure you have: a signed agreement, itemized invoices, proof of delivery (for work), and documentation of every follow-up attempt. A proper chase log that timestamps every follow-up is essential here.
Consider whether the amount justifies the time, stress, and potential relationship damage. For small amounts, sometimes walking away is pragmatic. For larger amounts, small claims or a lawyer may be worth it. See what to do when a client won't pay for more on prevention and when to cut losses.
What if you knew exactly who to chase every morning?
INV-042 · Acme Corp
31 days overdue · $4,200
INV-047 · Smith Design
14 days overdue · $1,850
INV-051 · DataFlow Inc
3 days overdue · $750
Ready to Track Your Invoices Visually?
Stop losing track of who owes you money. InvoiceGrid gives you a visual Kanban board, chase history, and professional email reminders.
Frequently Asked Questions
How soon after the due date should I send my first reminder?+
Within 24–48 hours. Not a week later, not when you remember. The first reminder should land the day after the due date (allowing one business day for banking clearance). A professional email referencing the invoice number, amount, and due date — no apology, no 'sorry to chase.' You're collecting a legitimate debt. The earlier you start, the more the client understands that you track invoices actively and that late payment has consequences.
How often should I chase an unpaid invoice?+
Day 1–2, Day 7, Day 14, Day 30, Day 45–60. That is 5 contacts over 60 days — the professional standard before escalating to legal or collections. Don't wait more than 2 weeks between contacts in the early stages. Use InvoiceGrid's free schedule planner to auto-generate these dates from any due date — it outputs a PDF/CSV chase schedule you can use as your calendar.
Should I chase by email, phone, or both?+
Email first — always. It creates a timestamped paper trail that is essential if escalation reaches small claims. If 2–3 emails go unanswered over 14+ days, add a phone call. A call breaks through inbox overload for clients who are responsive by phone but not email. Always log the call: date, time, who you spoke to, and what was said. "I called on [date] and spoke with [name], who confirmed payment would be made by [date]" is a record — "I called them once" is not.
My client says they'll pay next week — they've said this three times now. What do I do?+
Stop accepting verbal promises. After the second missed commitment, reply immediately in writing: 'To confirm our conversation — payment of £X for Invoice #Y is expected by [specific date]. Please confirm by return.' If that date passes: escalate to your firm-tone template with a hard deadline and explicit mention of next steps (late fees, collections, or small claims depending on how far along you are). Three missed commitments is a pattern, not bad luck — treat it as intentional delay.
How do I track which invoices I've chased and what stage they're at?+
Use an invoice tracker with per-invoice chase history. InvoiceGrid logs every follow-up — date, tone, response — and shows all invoices on a Kanban board (Pending, Reminded, Follow-up, Paid). The Today View surfaces exactly which invoices need action today. Combined with the free schedule planner and AR aging report generator, you have a complete picture of your outstanding AR without maintaining any spreadsheets manually.