How to write effective terms and conditions for online sales

Why your terms and conditions matter more than you think

Terms and conditions are often treated as an afterthought — something to copy from another site and bury in the footer. In practice, they are the contract that governs every sale you make. Get them right and they set expectations, reduce arguments and protect you when something goes wrong. Get them wrong, and you can find yourself on the wrong side of consumer law with a refund you didn't budget for and a customer who never comes back.

This guide covers the four areas that cause most of the friction for UK freelancers and small online sellers: delivery, returns, cancellations and disputes. It is written with the Consumer Rights Act 2015 and the Consumer Contracts Regulations 2013 in mind, but it is practical guidance rather than legal advice — for anything unusual, speak to a solicitor.

Start with clarity and incorporation

Before you worry about the detail, make sure your terms actually apply to the sale. That means two things.

• They must be visible before purchase. A link at checkout or a clearly labelled page on your site, with the customer asked to tick a box confirming they accept them, is the standard approach. Don't rely on a link hidden at the bottom of a confirmation email.
• They must be readable. The law expects terms to be transparent — plain language, legible, and not hiding important points in small print. Terms that mislead or unfairly disadvantage the consumer can be declared unfair and simply not enforced.

Write in short sentences. Use headings that match the customer's question — "When will my order arrive?" beats "Clause 4: Fulfilment". Your terms are read by anxious customers at 11pm, not by lawyers.

Delivery: say what happens when things go wrong

Under the Consumer Rights Act 2015, unless you agree a different date, you must deliver within 30 days of the order. If you can't, the customer can usually cancel and get a full refund.

Set out clearly:

• Delivery timescales in working days, and whether they are estimates or guarantees.
• Where you deliver to and any postcode or region exclusions.
• What happens if the parcel is late, lost or damaged. For consumer sales, the goods are your responsibility until they are delivered to the customer — even once they are with your courier. Say how quickly you will investigate and what remedy you will offer.
• Who pays return delivery in each scenario: faulty goods, change of mind, or a misdescribed item.

Vague wording such as "delivery times may vary" invites complaints. Specific wording such as "we aim to dispatch within two working days and delivery usually takes three to five working days" prevents them.

Cancellations and returns: get the 14-day rule right

Online sales to consumers are distance contracts, which means the customer has a legal right to cancel. The cancellation window is 14 days from the day the goods are delivered. They do not need a reason.

Your terms should state:

• The 14-day period and when it starts.
• That you will refund within 14 days of cancelling or of receiving the returned goods, whichever comes first.
• Whether the customer pays return postage. If you don't say anything, the law assumes you pay it — so be explicit.
• How goods should be returned, and that the customer must take reasonable care of them. You can require the cost of diminished value where items have been handled excessively, but never withhold a refund entirely for that reason.

There are exceptions. Bespoke or personalised items, sealed goods unsuitable for return on hygiene grounds, and digital content once downloaded can fall outside the right to cancel — but you must tell the customer this before they buy, or the exception won't stand. Many sellers also extend a goodwill returns window beyond 14 days; if you do, put it in writing alongside the statutory right so there is no confusion.

Faulty goods and the remedies you must offer

Distinguish between a change of mind and a faulty item, because the rules differ. If goods are faulty, not as described, or not fit for purpose, the customer has a 30-day short-term right to reject and receive a full refund. After that, they are entitled to a repair or replacement, and if neither is possible, a price reduction or a final right to reject.

Your terms cannot reduce these rights, and any clause attempting to do so is void. Instead, explain honestly what you will do: how to report a fault, what evidence you might need, and how quickly you will respond. Offer a clear contact route — an email address that someone actually monitors, not a web form that vanishes.

Resolving disputes without a courtroom drama

Most disputes come from uncertainty rather than bad faith. Include a short complaints procedure: who to contact, what information to send, and how long you will take to respond. Aim to acknowledge within a couple of working days and resolve within 14.

Consumers can also use alternative dispute resolution (ADR), and you must tell them whether you are willing to use it — you are not obliged to participate, but you must be upfront. If the dispute arose from an online purchase, they may also be able to use the relevant online dispute resolution service.

Keep records of every order, delivery date and email. If a chargeback or card dispute lands, that paperwork is your defence. And when you do get it wrong, refund promptly and apologise — a well-handled complaint creates more loyalty than a sale that never had a problem.

Keeping your terms fit for purpose

Review your terms at least once a year, and whenever you change couriers, add a payment method, start selling abroad or begin selling to businesses. Business-to-business terms can be far more flexible, so keep separate sets rather than forcing commercial customers into consumer wording.

Finally, date your terms and keep old versions on file. If a customer bought under last year's terms, that is the contract you need to honour. Clear, current and honest terms are not a legal chore — they are one of the cheapest trust-building tools you have.