Invoice Payment Terms: A Guide for UK Freelancers and Small Businesses

Getting paid on time starts with clear payment terms. Yet many freelancers and small business owners send invoices with vague language like "payment due upon receipt" or no payment terms at all.

This creates confusion, gives clients wiggle room to delay payment, and makes it harder to chase overdue invoices when (inevitably) they occur.

This guide explains how to set payment terms that protect your cashflow, what's standard in the UK, and how to write late payment clauses that actually work.

What Are Invoice Payment Terms?

Payment terms are the conditions under which you expect to be paid. They specify:

1. When payment is due (e.g., within 14 days of invoice date)
2. How payment should be made (bank transfer, card, cheque)
3. What happens if payment is late (interest, fees, legal action)

Clear payment terms set expectations upfront and give you legal standing if you need to chase payment later.

Standard Payment Terms in the UK

The most common payment terms for UK small businesses are:

1. Net 14 Days

"Payment due within 14 days of invoice date"

• Standard for freelancers and consultants
• Fast payment reduces cashflow pressure
• Shows you expect prompt payment

2. Net 30 Days

"Payment due within 30 days of invoice date"

• Standard for many industries
• More generous but increases cashflow wait
• Common when working with larger companies

3. Net 7 Days

"Payment due within 7 days of invoice date"

• For urgent or high-value work
• Appropriate for small, quick jobs
• Signals immediate payment expectation

4. Due on Receipt

"Payment due upon receipt"

⚠️ Avoid this. It's vague. Does "receipt" mean when they receive the invoice or when they open the email? Better to specify an exact number of days.

5. Net 60 or 90 Days

"Payment due within 60/90 days"

• Common when working with large corporates or government
• Terrible for cashflow
• Only accept if you can afford the wait

Recommendation: For most small businesses, Net 14 or Net 30 strikes the right balance between being reasonable and protecting cashflow.

How to Write Payment Terms on Your Invoice

Your payment terms should appear prominently on every invoice. Include:

1. Due Date

State the exact number of days payment is due:

✅ Good: "Payment due within 14 days of invoice date"

✅ Good: "Payment due by 28 February 2026"

❌ Bad: "Payment due upon receipt" (too vague)

❌ Bad: "Please pay soon" (not enforceable)

2. Payment Methods

Tell clients how they can pay:

Payment can be made by:
- Bank transfer (preferred): Sort Code 12-34-56, Account 12345678
- Debit/credit card: [payment link]
- Cheque payable to: [Your Business Name]

Make payment as easy as possible. The fewer barriers, the faster you get paid.

3. Late Payment Clause

Include a clause warning of late payment consequences:

Example 1 (Simple):

"Late payments may incur interest and charges under the Late Payment of Commercial Debts (Interest) Act 1998."

Example 2 (Specific):

"Overdue invoices will accrue interest at 8% + Bank of England base rate per annum plus £40-£100 fixed compensation, as permitted by the Late Payment of Commercial Debts (Interest) Act 1998."

Example 3 (Firm):

"Payment must be received within 14 days. Late payments will incur statutory interest at 11.75% per annum plus fixed compensation of £[amount]. Legal proceedings may be initiated for debts outstanding beyond 30 days."

The third option is firmest but may feel aggressive for some client relationships. Choose based on your industry and client type.

Understanding the Late Payment of Commercial Debts (Interest) Act 1998

Here's what many business owners don't realise: You have an automatic legal right to charge interest and compensation on late B2B payments, even if your invoice doesn't mention it.

The Late Payment Act gives you the right to claim:

1. Statutory interest at 8% + Bank of England base rate (currently 11.75%)
2. Fixed compensation of £40, £70, or £100 depending on invoice size

You don't need special wording on your invoice—these rights apply automatically. However, including a late payment clause:

• Reminds clients of the consequences
• Shows you're serious about payment terms
• Makes chasing easier (you can reference your terms)

Read our full guide to UK late payment rights for detailed information.

Should You Charge Interest in Advance?

Some businesses charge interest on their contract or invoice upfront:

"Interest charged at 2% per month on overdue invoices"

This is legal, and if your contractual rate is higher than the statutory rate (11.75%), you can claim whichever is higher.

Pros:

• Makes payment expectations crystal clear
• May prompt faster payment
• You can set a rate higher than statutory

Cons:

• May feel aggressive to new clients
• Can harm relationships
• Statutory right exists anyway, so it's redundant

Recommendation: For most small businesses, referencing the Late Payment Act is sufficient. Charging contractual interest makes sense if you're regularly dealing with slow payers or high-value contracts.

Payment Terms for Different Business Types

Different industries and business models call for different payment terms:

Freelance Consultants

• Standard: Net 14 or Net 30
• Reasoning: You're providing a service; payment should follow completion quickly
• Tip: For ongoing retainers, request payment upfront for the month ahead

Tradespeople (Plumbers, Electricians, Builders)

• Standard: Payment on completion (cash, card, or bank transfer)
• Reasoning: Work is completed on-site; payment should be immediate
• Tip: For large jobs (e.g., kitchen refits), request staged payments (e.g., 50% upfront, 50% on completion)

Product Sellers (E-commerce, Wholesale)

• Standard: Payment upfront (retail) or Net 30 (wholesale/B2B)
• Reasoning: Goods have been provided; you need payment to restock
• Tip: For large wholesale orders, consider 50% deposit, 50% on delivery

Agencies (Marketing, Design, Development)

• Standard: Net 14 or Net 30
• Reasoning: Projects often span weeks/months; final invoice issued on completion
• Tip: For projects over £5,000, request staged payments (e.g., 33% upfront, 33% mid-project, 34% on completion)

SaaS and Subscription Businesses

• Standard: Payment upfront (monthly or annual subscription)
• Reasoning: Service access requires active payment
• Tip: Use automated billing with Stripe/GoCardless to avoid manual invoicing

The Prompt Payment Code

The Prompt Payment Code is a voluntary initiative where businesses commit to:

• Paying invoices within 60 days (ideally 30 days)
• Not changing payment terms retrospectively
• Encouraging good payment practices down the supply chain

Over 3,500 UK businesses have signed up, including major corporates and public bodies.

What this means for you:

• If your client is a signatory, you can expect faster payment
• You can check signatories at promptpaymentcode.org.uk
• The Code is voluntary, so it's not legally binding

The Late Payment Act still applies regardless of whether your client has signed the Code.

Tips for Getting Paid Faster

Beyond setting clear terms, here are practical tips to reduce late payments:

1. Invoice Immediately

Don't wait until month-end or project completion. Invoice as soon as:

• Work is complete (for one-off projects)
• Goods are delivered
• The milestone is reached (for staged payments)

The sooner you invoice, the sooner you get paid.

2. Make Payment Easy

Include:

• Bank details prominently
• Payment links (Stripe, PayPal, GoCardless)
• QR codes for mobile payments
• Multiple payment options

The easier you make it, the faster it happens.

3. Send Reminders Proactively

Don't wait for the invoice to go overdue. Send a friendly reminder 2-3 days before the due date:

"Hi [Name], Just a heads-up that invoice #[number] for £[amount] is due on [date]. Let me know if you need any details. Thanks!"

This catches invoices that may have been overlooked.

4. Build Relationships with Accounts Teams

Your project contact isn't the person who pays you—the accounts team is. Get to know them:

• Ask for the accounts email/phone number
• Send invoices to accounts, not just your project contact
• Be polite and professional (they process hundreds of invoices; make their life easy)

5. Request Upfront Payment for New Clients

For clients you haven't worked with before, consider:

• 50% upfront, 50% on completion
• Full payment upfront for small projects (< £500)
• Deposit before work starts

This protects you if the client disappears or refuses to pay.

6. Use Invoice Software

Manual invoicing is error-prone and time-consuming. Use software to:

• Generate professional invoices instantly
• Track due dates automatically
• Send automated reminders
• Accept online payments

Popular UK options: Xero, QuickBooks, FreeAgent, Wave (free).

What to Do When Payment is Late

Despite your best efforts, some clients will pay late. Here's the process:

Day 1-7 Overdue: Friendly Reminder

"Hi [Name], Invoice #[number] was due on [date]. Just checking it hasn't been missed. Can you confirm when payment will be made? Thanks!"

Day 8-14 Overdue: Firmer Reminder

"Dear [Name], Invoice #[number] for £[amount] remains unpaid [X] days after the due date. Please arrange payment within 7 days. Under the Late Payment Act, we're entitled to charge interest on overdue invoices. Current amount owed: £[amount + interest]."

Day 15-28 Overdue: Formal Reminder with Interest

"Dear [Name], Invoice #[number] remains unpaid. We have now added statutory interest and compensation as permitted by law. Total owed: £[invoice + interest + compensation]. Please pay within 7 days to avoid further charges and potential legal action."

Day 28+ Overdue: Letter Before Action

Send a formal Letter Before Action warning of court proceedings. Use our free LBA generator.

Day 45+ Overdue: Small Claims Court

If the LBA doesn't work, start court proceedings via moneyclaim.gov.uk.

Read our guide to Letters Before Action for the full process.

Common Payment Terms Mistakes

1. No Terms at All

Invoices with no payment terms default to 30 days under UK law. But it's far better to state this explicitly.

2. Vague Language

"Payment due soon" or "Please pay when you can" isn't enforceable. Always use specific days.

3. Inconsistent Terms

Don't say "Net 14" on one invoice and "Net 30" on another for the same client. Pick standard terms and stick to them.

4. Changing Terms After Work Starts

If you agree on payment terms before starting work, don't change them on the invoice. That's unprofessional and may be unenforceable.

5. Accepting Extended Terms Without Question

Large companies often try to impose "Net 90" or "Net 120" payment terms. You can:

• Negotiate shorter terms
• Request a deposit
• Politely decline the work if cashflow won't allow it

Don't assume you have to accept their standard terms.

Automate Your Invoice Chasing

Manually tracking due dates, sending reminders, and calculating interest is time-consuming. NotPaidYet automates the entire process:

• Automatic reminders sent at the right time
• Interest calculation using UK statutory rates
• Professional escalation from polite to formal
• Letter Before Action generation compliant with UK law

Try NotPaidYet free for 7 days—no credit card required.

Summary: Setting Payment Terms That Work

To recap, effective invoice payment terms should:

1. Specify exact days (e.g., Net 14, Net 30)—not vague language
2. State payment methods clearly (bank details, payment links)
3. Include a late payment clause referencing the Late Payment Act
4. Be consistent across all invoices to the same client
5. Appear prominently on every invoice

Best practice for most UK small businesses:

"Payment due within 14 days of invoice date. Overdue invoices will incur statutory interest and compensation under the Late Payment of Commercial Debts (Interest) Act 1998."

Next steps:

• Review your current invoice template and add clear payment terms
• Calculate interest on any overdue invoices using our late payment calculator
• Automate your invoice chasing with NotPaidYet

Clear payment terms won't eliminate late payments entirely, but they'll give you the legal standing and confidence to chase what you're owed.