GuideFeb 12, 2026
How to automate invoice reminders in Xero (2026 guide)
Step-by-step guide to setting up Xero's built-in reminders — and how to go beyond its limits with SMS, smart scheduling, and auto-stop.
Read articleLate fees aren't about punishment. They're about incentivizing on-time payment. When clients know there's a real cost to paying late, invoices get prioritized.
This guide covers how to add late payment fees to your invoices legally and professionally, including fee structures, copy-paste wording templates, a late fee calculator, and tips for preserving client relationships.
“I have one client who is always late and no amount of polite conversations and requests every month seem to have any effect. Do you implement late fees?”
- Reddit user on r/freelance
“What I’m looking for is how to approach the customer now, during this contract period, in an effort to get more timely payments and stop the exploitation of the grace period.”
- Reddit user on r/smallbusiness
Get AI Summary
Yes, with conditions. In most jurisdictions, businesses can charge late payment fees on invoices as long as three requirements are met:
Late fee terms must be stated in your contract or on the invoice before work is performed.
The fee must be proportional to the invoice amount and not exceed legal limits in your jurisdiction.
The client must have been made aware of the terms. A signed contract is the strongest proof.
The specifics vary by jurisdiction. In the US, most states allow 1-2% per month. In the UK, the Late Payment of Commercial Debts Act gives businesses a statutory right to charge interest on late B2B invoices. Always check local regulations or consult a legal professional before setting your rate. For more detail on payment terms, see our invoice payment terms guide.
There is no one-size-fits-all approach to charging late fees. The right structure depends on your invoice size, industry, and client base. Here are the four most common options.
Charge a percentage of the outstanding balance monthly. A $5,000 invoice at 1.5%/month accrues $75 each month. Scales naturally with invoice size.
A fixed dollar amount added to any late invoice. Simple to understand and administer, but may not motivate payment on large invoices.
A fee accrues for every calendar day overdue. Creates urgency because clients see the amount growing daily.
The fee increases the longer payment is delayed. Rewards quick resolution and penalizes chronic late payers more heavily.
Adding a late fee is not just about slapping an extra charge on an overdue invoice. To be enforceable and professional, follow these five steps.
Before you can charge a late fee, it needs to exist in writing. Add a late payment clause to your service agreement or proposal. Be specific about the rate, when it starts, and how it is calculated.
Get 12 copy-paste late fee clausesAdd a 'Payment Terms' section on your invoice that states the due date, the late fee rate, and when it takes effect. Even if it is in the contract, restating it on the invoice removes ambiguity.
See late payment invoice templatesSend at least one payment reminder before the fee kicks in. This gives the client a chance to pay, demonstrates good faith, and makes the fee much harder to dispute.
Use overdue invoice email templatesCalculate the late fee and add it as a separate line item on a revised invoice. Send it with a brief, professional note explaining the charge. Never bury the fee -- make it visible and clearly labeled.
If you waive the fee every time, clients learn your terms are optional. Set up a follow-up schedule and stick to it. Automation makes this much easier.
Automate follow-ups with ChaseBotCopy and paste these clauses directly into your invoices or contracts. Adjust the rate, grace period, and currency to match your business. For the full collection, see our 12 late payment fee clauses.
A late payment fee of 1.5% per month (18% per annum) will be applied to all outstanding balances not received within 15 days of the invoice due date. Interest shall accrue from the first day after the grace period until payment is received in full.
A flat late payment fee of $35.00 will be applied to any invoice not paid in full within 30 days of the due date. This fee is in addition to the original invoice amount and is payable immediately upon assessment.
Late payment fees will be assessed as follows: 1-30 days past due: 1.0% per month; 31-60 days past due: 1.5% per month; 61+ days past due: 2.0% per month. Fees are calculated on the total outstanding balance from the original due date.
The formula depends on the fee structure you use. Here are the basic calculations for each type.
| Fee type | Formula | Example ($5,000, 45 days late) |
|---|---|---|
| Monthly % | Amount x rate x months overdue | $5,000 x 1.5% x 1.5 = $112.50 |
| Annual % | Amount x (rate / 365) x days | $5,000 x (18%/365) x 45 = $110.96 |
| Flat fee | Fixed amount per invoice | $35.00 flat fee |
| Daily rate | Daily fee x days overdue | $5.00 x 45 = $225.00 |
Don't want to do the math manually? Use our late payment interest calculator to calculate the exact late fee based on your rate, invoice amount, and days overdue.
Late fees are a tool, not a rule. There are situations where waiving or deferring the fee is the smarter business decision.
If a reliable client misses a deadline for the first time, a friendly reminder is usually enough. Waive the fee and note it will apply next time.
A client who has paid on time for years and slips once deserves a gentle reminder, not a penalty. Protect the relationship.
Charging a $35 late fee on a $50 invoice looks disproportionate. For very small amounts, a simple reminder is more effective.
If the client is disputing the invoice amount or deliverable quality, adding a late fee escalates the situation. Resolve the dispute first.
The way you communicate a late fee matters as much as the fee itself. Here are four principles for handling it professionally.
Mention payment terms during onboarding and on every invoice. A brief note -- 'Our terms are Net 30 with a 1.5% monthly late fee' -- prevents surprise later.
Before the late fee kicks in, send a courtesy reminder: 'Your invoice #1042 is 10 days past due. A 1.5% late fee applies after 15 days.'
Use neutral language: 'Per our payment terms, a late fee of $75.00 has been applied to invoice #1042.' Be consistent across all clients.
When reminders come from a system rather than a personal email, they feel less confrontational. Tools like ChaseBot handle this automatically.
Need email templates for these conversations? See our overdue invoice email templates and late payment invoice templates.
Manually tracking overdue invoices is tedious and awkward. ChaseBot connects to your Xero account and monitors invoices automatically. When one goes overdue, it triggers a multi-step reminder sequence via email and SMS, and stops the moment payment is received.
Multi-step email and SMS reminders that escalate based on how overdue the invoice is. No manual tracking required.
Automatically reference your late fee terms in reminder messages so clients know exactly what to expect.
The moment a client pays, all reminders cease. No awkward follow-up after the invoice is settled.
You know how to add late fees. Now automate the enforcement : reminders, escalation, and payment tracking. All on autopilot.
Try ChaseBot freeStep-by-step guide to setting up Xero's built-in reminders — and how to go beyond its limits with SMS, smart scheduling, and auto-stop.
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Read articleCopy-paste late fee clauses for your invoices and contracts. Percentage-based, flat fee, payment terms, and early discount wording.
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