Invoicing
Invoice Payment Terms and Late Payment Rules in 2026
What Net 30 actually obliges, when statutory late-payment interest applies, and the invoice fields that stop a client from disputing the clock.
By Emily Richardson · Reviewed by Legamoney Editorial Team
Late payment is rarely a dispute about willingness. It is usually a dispute about whether the invoice was valid, when it arrived, and who was supposed to approve it. Fixing the paperwork removes most of the delay.
Key takeaways
- Payment terms only start when a valid invoice is received — incomplete invoices reset the clock.
- Several jurisdictions give suppliers a statutory right to interest and a fixed recovery cost without a contract clause.
- Stating the due date as a calendar date removes the most common dispute.
- Purchase order numbers are the single most frequent reason an invoice sits unpaid in accounts payable.
- Escalation works best as a documented sequence: reminder, statement, formal demand, then recovery.
In this guide
What the common terms mean
| Term | Meaning | Note |
|---|---|---|
| Net 30 | Payable 30 days after invoice date | Check whether the client counts from receipt instead |
| EOM 30 | 30 days after the end of the invoice month | Effectively 30–60 days |
| 2/10 Net 30 | 2% discount if paid within 10 days | An expensive discount to give routinely |
| Due on receipt | Payable immediately | Rarely enforceable against corporate AP cycles |
Make the invoice undisputable
- Your legal entity name, registration number, and tax number.
- The client's exact legal entity — not a trading name.
- A unique sequential invoice number.
- Invoice date and an explicit calendar due date.
- The purchase order or reference the client's AP system expects.
- A line-level description matching the agreed scope.
- Tax treatment shown separately, including any reverse-charge wording.
- Bank details in the format the payer's system needs.
A chase sequence that works
Send a polite reminder three days before the due date, a statement on day one past due, a formal demand naming the statutory interest at day fourteen, and only then escalate. Each step should be in writing, because a paper trail is what makes any later recovery straightforward.
Terms only work if the invoice is correct
Most late payments are not disputes about willingness to pay. They are invoices sent to the wrong address, missing a purchase-order reference, or lacking the details the payer's system requires. Fixing those mechanics usually improves collection times more than shortening the stated terms.
- Agree the payment terms in the order documentation, not for the first time on the invoice.
- Include the purchase order or reference the payer requires, and address the invoice to accounts payable.
- State the due date as a date rather than as a number of days.
- Set an explicit late-payment charge in the contract, and check what your jurisdiction allows.
- Send a statement before the due date, not only after it.
An escalation ladder that preserves the relationship
A predictable sequence works better than an unpredictable one: a courtesy reminder before the due date, a factual notice on the day after, a call to the buyer's accounts payable team in the following week, then a formal written demand referencing the contractual charge. Keep every step documented, because the record is what makes a later formal claim straightforward.
Sources
- 01Federal Trade Commission — Business Guidance
Rules on negative-option billing, automatic renewals, and advertising claims.
- 02IRS — Small Business and Self-Employed Tax Center
Federal filing obligations, deposit schedules, and current-year thresholds for US businesses.
Frequently asked questions
Can I charge late payment interest without a contract clause?
In the UK and EU, business-to-business suppliers generally can under statutory late-payment legislation. Elsewhere it usually depends on your contract, so include an interest clause as standard.
Does emailing an invoice count as delivery?
Usually yes, if the contract allows electronic invoicing and it reaches the address the client nominated. Sending to an individual rather than the accounts payable address is a common reason a clock never starts.
Editorial transparency
- Written by
- Emily Richardson — SaaS and fintech writer — business software and financial technology
- Reviewed by
- Legamoney Editorial Team — Editorial Team — finance, insurance, lending and consumer legal topics
- How this was researched
- Written from published statutory late-payment frameworks and standard commercial invoicing practice. Rates and thresholds are referenced to the authority that publishes them.
- Corrections
- Spotted an error? Tell us and we will correct and re-date the page. See our editorial policy.
- Advertising disclosure
- Ad placements are clearly labelled and never influence editorial judgement or the ordering of comparisons.
About the author
Emily Richardson covers the software side of money: accounting and invoicing platforms, payroll and CRM tooling, payment processing and consumer fintech. Her comparisons are built from vendors' own published pricing and terms pages, dated at the time of writing, rather than from review-site rankings or affiliate placements. She works with the Legamoney Editorial Team desk.
How this article was checked
- Every factual claim is traced to a named regulator, government agency, or the provider's own published terms before publication.
- Figures that change — rates, limits, thresholds — link to the primary source that publishes them rather than being quoted as a fixed number.
- Worked examples are shown as full arithmetic so a reader can reproduce the result independently.
- Each guide is checked by the owning editorial desk before it is published, and again whenever the underlying rules change.
Covers: SaaS pricing models and total cost of ownership · Accounting, invoicing and payroll software · Payments and business banking tooling · Consumer and business fintech products
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Disclaimer
Late payment rules differ by country and by contract. This is general information, not legal advice. Consult a qualified professional before acting on any information here. Read our full disclaimer.