AI-assisted freelance writing on Upwork and Fiverr: fees, AI disclosure and UK tax
How this guide works: it’s a research guide based on each platform’s own help pages and GOV.UK, checked 24 October 2026. It isn’t a review, we haven’t sold work on either platform for this article, and we don’t publish earnings figures. Upwork and Fiverr show their examples in US dollars; pounds in brackets are approximate, using European Central Bank reference rates for 23 October 2026. None of the links on this page are affiliate links.
Who this is for
You write well, you’ve started using ChatGPT, Gemini or Copilot to speed up drafts, and you’re wondering whether you could sell writing on a freelance marketplace. This guide covers the parts most “start freelancing with AI” videos skip: what the platforms take, what to tell clients about AI, who owns the words, and what HMRC expects.
It doesn’t promise you’ll win work. Writing is one of the most crowded categories on any marketplace, and AI has made basic drafting cheaper for clients too. What clients still pay for is judgement: accurate facts, a voice that sounds like them, and copy that does a job.
What the platforms take
Upwork
Upwork charges freelancers a Freelancer Service Fee of 0% to 15% per contract. The fee is set per contract, shown to you before you send a proposal or accept an offer, and fixed once the contract starts. Upwork’s own example: to take home $20 an hour after a 10% fee, you’d charge $22.22 an hour. If money is refunded to the client, Upwork returns the fee you paid on it (Upwork Help, checked 24 Oct 2026).
Upwork also sells a paid Freelancer Plus membership. Its help centre says freelancers on the free Basic plan get roughly 10 messages a week with Uma, Upwork’s built-in AI assistant, while Freelancer Plus members get full access (Upwork Help). Check the current membership price inside your account before paying for it.
Fiverr
On Fiverr, sellers earn 80% of the purchase amount for each completed order, including Gig extras and tips (Fiverr Help Centre, checked 24 Oct 2026). Eligible sellers can skip the clearing period for a 1% Early Payout fee. Buyers pay their own service fee on top: 5.5% of the purchase, plus $3.50 (≈£2.62) on orders under $200 (Fiverr Help Centre). That buyer fee makes small orders more expensive for your client, which is worth knowing when you set a minimum price.
| Platform | Fee on your earnings | Fee the client pays | Worth knowing |
|---|---|---|---|
| Upwork | 0% to 15% per contract, shown before you bid | Set by Upwork; not covered here | Fee refunded if the client is refunded |
| Fiverr | 20% (you keep 80%) | 5.5%, plus $3.50 on orders under $200 | 1% fee for Early Payout |
Telling clients you use AI
Upwork’s help centre is direct about this: it recommends that you tell clients upfront when you use generative AI on their projects, and that you check they haven’t banned all or some AI tools for the work (Upwork Help). That’s sensible on any platform. Some clients are happy for you to use AI for outlines and first drafts; others need human-written copy for their own policies or for a publisher. If you hide it and they find out, you’ve lost the client and probably a review.
A simple line in your profile and proposals does the job, for example: “I use AI tools for research outlines and first drafts. Every piece is fact-checked, rewritten in your brand voice and edited by me. Tell me if your project needs no AI at all.” Fiverr has its own terms and category rules, so read the current ones in your seller dashboard before you list a Gig.
Confidential details and personal data
Clients often send briefs with unpublished product details, customer quotes or staff names. Don’t paste those into a consumer AI tool without the client’s agreement. On some personal plans, your chats may be used to train models unless you switch that off. If a brief includes personal data, you may be handling it on the client’s behalf, and UK GDPR applies. Our AI and UK GDPR guide explains what to check.
Who owns AI-assisted writing?
Clients usually expect to own the copy they pay for, so agree that in writing: who owns the final text, when ownership passes (normally on payment), and whether you can show it in your portfolio.
The law on AI output itself is still being looked at. The UK government’s Report on Copyright and Artificial Intelligence, published on 18 March 2026, describes legal uncertainty about how UK copyright applies to work generated by a computer without a human author, and sets out options including removing that specific protection. It says work that’s AI-assisted but shows human creativity would still be protected under the option it describes (GOV.UK). The practical takeaway: the more of your own writing and editing goes into a piece, the stronger your position, and the clearer your contract, the fewer arguments later.
What clients actually pay for
- Accuracy. AI tools can state wrong facts with total confidence. Check every statistic, price, date and quote against a source you can link to.
- Voice. Ask for two or three examples of writing the client likes, and match them. Generic AI phrasing is easy to spot.
- Structure that does a job. A product page needs to answer buyer questions; an email needs one clear next step.
- Reliability. Deadlines met, briefs followed, revisions handled without fuss. Reviews on both platforms depend on it.
UK tax basics for marketplace writers
Paid writing work is normally trading income. You can earn up to £1,000 a year of trading income tax-free under the trading allowance; above that, you’ll usually need to register for Self Assessment (GOV.UK). Since 1 January 2024, online platforms that let you sell services have had to collect information about sellers and report it to HMRC, and the exception for small sellers doesn’t apply to services, so assume HMRC can see what you earn (GOV.UK, Selling goods or services on a digital platform).
Keep records of every payout, the platform fees deducted, and your tool subscriptions. Note that the £1,000 is gross income, and if you go over it you either deduct your actual expenses or the allowance, not both. If you’re paid in dollars, record the sterling amount that lands in your bank. Our UK side hustle tax basics guide covers deadlines and record-keeping, and How to price AI-assisted freelance work shows how to build fees and tax into your rates.
A sensible first month
- Pick one niche you know, such as local trades, recruitment or e-commerce product pages.
- Write three short portfolio samples yourself, using AI only where you’d be happy to say so.
- Write a clear AI-use line for your profile and proposals.
- Set prices that cover the platform fee, your tools and tax, not just your time.
- Keep a simple spreadsheet of income, fees and expenses from day one.
FAQ
Is it against the rules to use AI on Upwork?
Upwork’s help centre doesn’t ban it. It recommends telling clients upfront and checking they haven’t prohibited AI tools for their project. Individual clients can set their own rules, so read each brief.
Do I pay the Fiverr 20% on tips?
Fiverr says you earn 80% of the purchase amount, including Gig extras and tips, so the 20% applies to tips too.
Do I need to register with HMRC for a few small jobs?
If your total trading income in a tax year is £1,000 or less, the trading allowance usually means you don’t need to tell HMRC. Above that, check GOV.UK or ask an accountant.
Sources
All checked 24 October 2026 unless stated. Prices change, so check before you buy.
- Upwork, Freelancer Service Fee: support.upwork.com
- Upwork, How to use Uma as a freelancer: support.upwork.com
- Fiverr, Your earnings page: help.fiverr.com
- Fiverr, Paying for orders, extras or custom offers: help.fiverr.com
- GOV.UK, Report on Copyright and Artificial Intelligence (18 March 2026): gov.uk
- GOV.UK, Tax-free allowances on property and trading income: gov.uk
- GOV.UK, Selling goods or services on a digital platform: gov.uk
- ECB euro reference rates, 23 October 2026: ecb.europa.eu
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