Online Seller Accountant UK — Simplr Accounting

Online Seller
Accounting,
Simplr.

Specialist UK accountants for ecommerce sellers, marketplace sellers and online shop owners.

Whether you sell on Amazon FBA, Etsy, eBay, Shopify, Vinted, Depop, Whatnot or your own website, we help keep your bookkeeping, tax returns, VAT, stock costs and platform fees organised and HMRC-compliant.

01 / Why Simplr

Built for the way online sellers actually trade.

Online selling is not just “sales minus costs”. You have platform payouts, refunds, marketplace fees, postage, stock, packaging, payment processors, VAT rules and sometimes multiple platforms feeding into one business. We organise the moving parts.

01

Marketplace specialists

We understand Amazon, Etsy, eBay, Shopify, Vinted, Depop, Whatnot and multi-platform seller income.

02

Inventory and COGS

We help track stock purchases, cost of goods sold, shipping, packaging and marketplace costs properly.

03

VAT support

We help you understand the VAT threshold, registration, VAT returns and whether schemes like the margin scheme may be relevant.

04

Cloud bookkeeping

We use online tools like Xero and Hubdoc to keep your records clean, digital and tax-ready.

05

Making Tax Digital ready

As your income grows, we help keep your records ready for digital reporting and quarterly updates.

06

Fixed monthly fees

No surprise bills. Just clear support and pricing that makes sense for an online business.

Do online sellers pay tax?

If you sell for profit,
HMRC wants to know.

If your trading income is more than £1,000 in a tax year, you usually need to register as self-employed and file a Self Assessment tax return.

If your taxable turnover goes over £90,000 in a rolling 12-month period, you must register for VAT. If you sell second-hand goods, VAT can be more nuanced, so proper advice matters.

£1,000
Self Assessment
threshold
£90k
VAT registration
threshold
£50k
MTD Income Tax
from 2026
03 / Who we help

Accountants for ecommerce, resale and marketplace sellers.

Whether you are clearing a few sales a week or running a serious multi-platform business, your numbers need to keep up with your growth.

/ 01

Amazon FBA sellers

For sellers dealing with FBA fees, storage, advertising, refunds, inventory and multi-marketplace income.

/ 02

Etsy and Shopify stores

For makers, brands and online shops with payment processors, shipping labels, materials and software costs.

/ 03

Vinted, Depop and Whatnot

For resale businesses with stock sourcing, bundles, auctions, platform payouts, postage and packaging.

/ 04

Multi-platform sellers

For sellers juggling several income streams who need one clear view of profit and tax.

04 / FAQs

Online seller questions, straight answers.

Quick answers before you book a call.

Do online sellers need to pay tax in the UK?
Yes, if you are selling with the intention of making a profit. If your trading income is over £1,000 in a tax year, you usually need to register as self-employed and file a Self Assessment tax return.
What expenses can online sellers claim?
Common expenses include stock purchases, packaging, postage, platform fees, payment processing fees, advertising, software, photography equipment, storage, mileage, home office costs and accountancy fees.
Do I need to register for VAT?
You must register for VAT if your taxable turnover goes over £90,000 in a rolling 12-month period, or if you expect it to go over £90,000 in the next 30 days.
What is cost of goods sold?
Cost of goods sold is the cost of the stock you actually sold during the period. For sellers, tracking this properly is important because buying stock is not always the same as claiming the whole cost immediately.
Can you help with Amazon, Etsy, eBay, Shopify, Vinted, Depop or Whatnot?
Yes. We work with online sellers across major marketplaces and help organise sales, fees, refunds, stock costs and platform payouts into clean accounting records.
Should I trade as a sole trader or limited company?
It depends on your profit, risk, admin tolerance and future plans. Many sellers start as sole traders, then move to a limited company as the business grows. We can advise when it makes sense.
Ready when you are

Let’s make your seller accounts Simplr.

Free 20-minute discovery call. No pressure, no jargon, just a clear answer on what we can do for your online business.

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