UK Author Tax Checklist 2026: Self-Assessment for Self-Publishers

Last reviewed by Robert Prime — July 2026

Quick Answer: Register with HMRC as self-employed once your publishing income passes £1,000/year. File Self Assessment by 31 January. Claim editing, design, advertising, ISBN, and home office costs as expenses. Keep records for 5 years. Full checklist below — 22 steps from registration to filing.

Table of Contents

• Do you need to register?
• The complete tax checklist (22 steps)
• Allowable expenses for self-published authors
• Record-keeping — what to save
• Key dates for 2026/27
• KDP royalties and US tax
• Common mistakes
• Frequently asked questions
• Final thoughts

Do you need to register?

The short version:

The £1,000 trading allowance means your first £1,000 of self-employment income (including publishing royalties) is tax-free and doesn't need to be reported. Once you pass £1,000 in a tax year (6 April to 5 April), you must register and file.

Important: the £1,000 is gross income (before expenses), not profit. If you earn £1,200 in royalties and spend £800 on editing, your profit is £400 — but you still need to register because your gross income exceeded £1,000.

The complete tax checklist (22 steps)

Registration (do this once)

• 1. Register as self-employed with HMRC. Go to gov.uk/register-for-self-assessment. You're registering as a sole trader. Your trade description is "Author" or "Self-published author."

• 2. Register by the deadline. You must register by 5 October in the second tax year of trading. E.g. if you started earning royalties in the 2025/26 tax year (6 April 2025 – 5 April 2026), register by 5 October 2026. Registering late incurs a penalty.

• 3. Receive your UTR (Unique Taxpayer Reference). HMRC posts this to your registered address within 10 working days. It's a 10-digit number. You need it for everything. Don't lose it.

• 4. Set up your HMRC online account. Go to gov.uk/personal-tax-account and link your UTR. This is where you'll file your return.

• 5. Set up an activation code. HMRC posts a second letter with an activation code for online filing. This takes another 7–10 working days. Factor in the postal delays — don't leave this until January.

During the tax year (ongoing)

• 6. Keep a record of all royalty income. Download monthly royalty reports from KDP, Apple Books, Kobo, IngramSpark, and any other platform you sell through. Save the PDFs and note the GBP equivalent for any payments in foreign currency.

• 7. Record the exchange rate used. KDP pays in multiple currencies. Use the exchange rate on the date of payment (shown on your bank statement) or HMRC's monthly exchange rates. Be consistent — use the same method all year.

• 8. Keep receipts for all business expenses. Every invoice for editing, cover design, formatting, advertising, ISBN purchase, software subscription, proof copies, postage, and office supplies. Digital receipts are fine — photograph paper ones and store them in a dedicated folder.

• 9. Track home office costs (if applicable). If you write and manage your publishing business from home, you can claim a proportion of household costs. Two methods:

  • Simplified expenses: Claim a flat rate based on hours worked from home per month (25–50 hours: £10/month; 51–100 hours: £18/month; 101+ hours: £26/month)
  • Actual costs: Calculate the proportion of your home used for business (e.g. one room out of five = 20% of heating, electricity, broadband, council tax). More paperwork, potentially more valuable.

• 10. Track mileage for book-related travel. Visits to your editor, book fairs, signings, meetings with cover designers — claim 45p/mile for the first 10,000 miles, 25p/mile after that. Keep a log: date, destination, purpose, miles.

• 11. Set aside money for your tax bill. A safe rule: put 25–30% of your net profit into a separate savings account as you earn it. The tax bill in January is easier to pay when you've been saving all year.

• 12. Complete the KDP tax interview (W-8BEN). This is separate from UK tax — it stops Amazon withholding 30% of your US royalties at source. See our KDP tax interview walkthrough. Do this before your first royalty payment if possible.

Filing the return (annually)

• 13. Gather your royalty statements. Collect all platform royalty reports for the tax year (6 April – 5 April). KDP, IngramSpark, Apple Books, Kobo, Draft2Digital — anywhere you earned money.

• 14. Calculate your total gross income. Add up all royalties received in the tax year, converted to GBP. This is Box 15 on the self-employment section of the return.

• 15. Calculate your total allowable expenses. Add up all business expenses with receipts. This is Box 17–30 on the self-employment section.

• 16. Calculate your net profit. Gross income minus allowable expenses = net profit. This is what you'll pay tax on (after your personal allowance).

• 17. Log in to HMRC and file online. Go to your personal tax account → Self Assessment → File your return. Complete the self-employment pages (SA103S — short version for most authors).

• 18. Check for payments on account. If your tax bill exceeds £1,000, HMRC may require "payments on account" — two advance payments towards next year's bill, each 50% of this year's total. These are due 31 January and 31 July.

• 19. File by the deadline. Online filing deadline: 31 January following the end of the tax year. E.g. for the 2025/26 tax year (ending 5 April 2026), file by 31 January 2027. Late filing: £100 automatic penalty, rising to £10/day after 3 months.

• 20. Pay by the deadline. Payment deadline is also 31 January. Pay via bank transfer (fastest), debit card, or Direct Debit. HMRC's payment reference is your UTR + the tax year (e.g. 1234567890 K 2526). Allow 3 working days for bank transfer to clear.

After filing (housekeeping)

• 21. Save a copy of your filed return. Download the PDF from your HMRC account. Store it alongside your receipts and royalty statements.

• 22. Keep all records for at least 5 years. HMRC can investigate your return for up to 5 years (longer if they suspect fraud). Keep: filed returns, royalty statements, expense receipts, bank statements, exchange rate records.

Allowable expenses for self-published authors

These are the expenses you can deduct from your gross income to reduce your tax bill. All must be "wholly and exclusively" for your publishing business.

Not claimable:

• Your own time/labour (you can't pay yourself a wage as a sole trader)
• Clothing (even if you only wear it for author events)
• Fines or penalties
• Personal broadband/phone in full (only the business proportion)
• Meals while writing at home (meals while travelling to a business event are claimable)

Record-keeping — what to save

Create a simple folder structure (physical or digital):

Publishing Tax Records/
├── 2025-26/
│   ├── Income/
│   │   ├── KDP-monthly-reports/
│   │   ├── IngramSpark-statements/
│   │   └── Other-platforms/
│   ├── Expenses/
│   │   ├── Editing-invoices/
│   │   ├── Design-invoices/
│   │   ├── Advertising-receipts/
│   │   ├── ISBN-receipts/
│   │   ├── Software-subscriptions/
│   │   └── Other-expenses/
│   ├── Bank-statements/
│   ├── Exchange-rates/
│   └── Filed-return-copy.pdf
├── 2026-27/
│   └── (same structure)

A spreadsheet tracking monthly income and expenses is enough for most self-publishers. You don't need accounting software unless your publishing business is complex. A simple template:

Month | Platform | Currency | Amount (foreign) | GBP equivalent | Category
------|----------|----------|-------------------|----------------|----------
Apr   | KDP      | USD      | $342.17           | £271.50        | Royalties
Apr   | KDP      | GBP      | £89.20            | £89.20         | Royalties
Apr   | Kobo     | GBP      | £12.40            | £12.40         | Royalties
Apr   | —        | GBP      | -£450.00          | -£450.00       | Copy editing

Key dates for 2026/27

KDP royalties and US tax

KDP royalties from the US marketplace (.com) are subject to US withholding tax — unless you've completed the KDP tax interview and claimed the UK–US treaty rate of 0%. This is a separate process from your UK Self Assessment.

• If you've completed the W-8BEN: 0% US withholding. You declare the full amount as UK income.
• If you haven't: 30% is withheld by Amazon. You can still claim credit for the withheld tax on your UK return (Box 2 of SA106 — Foreign income), but it's far simpler to claim 0% upfront.

See our KDP tax interview walkthrough for the exact fields.

Common mistakes

Mistake 1: Not registering because "I'm not earning much yet." The £1,000 threshold is gross income, not profit. Once you cross it — even if your expenses wipe out the profit — you need to register.

Mistake 2: Missing the registration deadline. Register by 5 October in the second tax year of trading. Miss it and you'll face a late registration penalty.

Mistake 3: Not claiming allowable expenses. Every unclaimed expense means more tax. That £400 copy editing invoice reduces your taxable profit by £400. At the basic rate (20%), that's £80 back in your pocket.

Mistake 4: Mixing personal and business spending. If possible, use a separate bank account (or at minimum a separate section in your spreadsheet) for publishing income and expenses. It makes the return much faster and keeps HMRC happy if they ever ask to see your records.

Mistake 5: Forgetting foreign exchange. KDP pays in USD, EUR, and GBP. You must convert non-GBP payments to sterling for your return. Use the exchange rate on the payment date (bank statement) or HMRC's published monthly rate. Don't guess.

Mistake 6: Not saving for the tax bill. Your first Self Assessment bill can be a shock — especially if HMRC also asks for payments on account (essentially prepaying next year's tax). Set aside 25–30% of net profit monthly.

Mistake 7: Throwing away receipts. Keep everything for 5 years. Digital copies are fine — photograph paper receipts the day you get them.

Frequently asked questions

Do I need an accountant?

Most self-publishers with straightforward income (royalties from a few platforms, standard expenses) can file their own return using HMRC's online system. It's designed for sole traders and walks you through the boxes. An accountant becomes worthwhile when: your income is significant (over £30,000/year), you have complex structures (a limited company, multiple revenue streams), or you simply don't want the hassle. Expect to pay £150–£500/year for a basic sole trader return.

What if I made a loss?

If your allowable expenses exceed your income (common in year one — you spent on editing and design before the book earned anything), you have a trading loss. You can carry the loss forward to offset against future publishing profits, or set it against other income in the same tax year. Report it on your Self Assessment return.

Are ebook royalties subject to VAT?

UK VAT on ebooks was reduced to 0% in May 2020 (previously 20%). Physical books have always been zero-rated. So neither your ebook nor your paperback royalties attract VAT. You don't need to register for VAT unless your total business turnover exceeds the VAT threshold (currently £90,000/year).

What about royalties from non-UK Amazon stores?

All income goes on your UK return, regardless of which country's Amazon store generated it. KDP US royalties (in USD) and KDP DE/FR/ES/IT royalties (in EUR) are converted to GBP at the exchange rate on the payment date. If you've completed the W-8BEN, there's no US tax to worry about — you just declare the full GBP amount.

Can I use the trading allowance instead of claiming expenses?

Yes. If your gross publishing income is under £1,000, you don't need to register at all. If it's between £1,000 and roughly £2,000, you can choose between: (a) claiming the £1,000 trading allowance (no expense receipts needed, but you can't claim expenses on top), or (b) claiming actual expenses. Choose whichever gives you the lower taxable profit. Once your expenses regularly exceed £1,000, actual expenses is almost always better.

Final thoughts

The tax side of self-publishing isn't complicated — it's just unfamiliar. Register once, keep your receipts, file once a year, and put 25% aside as you earn. That's it.

The thing that actually determines whether your book earns enough to have a tax problem is whether it looks professional enough to sell. The two biggest factors: cover design and interior formatting. If your formatting's not right — wrong margins, missing headers, amateur page layout — readers notice in the Look Inside preview and move on. Run a free KDP Readiness Score on your file before uploading, or let us format it for you from £69 so you can focus on the writing and the selling.

— Robert publishing.co.uk