HMRC Sales & Tax Threshold Checker

Selling online often starts as a hobby, a side hustle or a way to earn extra income from reselling. As your sales grow, however, you may become subject to several important HMRC rules and reporting thresholds. Understanding when these thresholds apply can help you stay compliant, avoid unexpected obligations and plan your business with confidence.

The SellerStack HMRC Sales & Tax Threshold Checker helps UK online sellers quickly assess where they currently stand against four of the most important HMRC thresholds that can affect reselling businesses:

• £1,000 Trading Allowance – Find out whether your trading income may exceed HMRC’s annual tax-free trading allowance.
• Digital Platform Reporting – Check whether your selling activity could fall within the reporting requirements introduced for online marketplaces.
• VAT Registration Threshold – See whether your taxable turnover is approaching or exceeds the current VAT registration threshold.
• Making Tax Digital (MTD) for Income Tax – Understand whether your trading income may bring you within the scope of upcoming MTD requirements.

Simply enter your annual trading figures into the checker to receive an instant SellerStack Threshold Assessment, showing whether you are comfortably below a threshold, approaching it or may already have exceeded it.

Unlike a tax calculator, this tool is designed to help you understand when important HMRC rules may become relevant, allowing you to make informed decisions before problems arise.

Important: This checker provides general guidance only. It does not calculate how much tax you owe, determine whether your activity legally counts as trading or replace professional tax advice. Always refer to the latest HMRC guidance or consult a qualified accountant if you are unsure about your individual circumstances.

What This HMRC Checker Helps You Understand

Online sellers often hear several different numbers mentioned in relation to HMRC:

• £1,000
• 30 sales
• Approximately £1,700
• £20,000
• £30,000
• £50,000
• £90,000

These figures do not all mean the same thing.

Some relate to whether you may need to tell HMRC about trading income. Others determine whether an online platform may report seller information, whether VAT registration may be required or when Making Tax Digital becomes mandatory.

The checker assesses each area separately so that you do not accidentally confuse a platform-reporting limit with a tax-free allowance.

How to Use the HMRC Sales & Tax Threshold Checker

Complete each part using the most accurate figures available.

1. Enter your gross trading income

Enter the money received from genuine trading activity during the tax year, before deducting:

• Stock costs
• Marketplace fees
• Postage
• Packaging
• Advertising
• Other business expenses

Do not include money received from occasional sales of your own unwanted personal possessions unless those sales form part of a trading activity.

2. Describe your selling activity

Choose the option that most closely describes what you do:

• Buying or making products to sell for profit
• Selling your own unwanted personal possessions
• A mixture of personal sales and trading

This distinction matters because selling an old phone, unwanted clothing, or household possessions is not automatically the same as operating a reselling business.

For a more detailed explanation, read our guide to [Vinted HMRC Tax Rules 2026: What Casual UK Sellers Need to Know].

3. Enter your online-platform activity

Add:

• The number of completed goods sales
• The gross amount received through the platform

Use figures for the relevant calendar year rather than your profit after costs.

4. Enter your VAT-taxable turnover

VAT registration normally uses your taxable turnover over a rolling 12-month period, not simply the current tax year or accounting year.

Also enter the taxable turnover you expect in the next 30 days so the checker can assess the separate forward-looking VAT test.

5. Enter your Making Tax Digital qualifying income

Enter your relevant gross income from:

• Self-employment
• Property

Then select the MTD implementation year you want to check.

Understanding the £1,000 Trading Allowance

The trading allowance allows eligible individuals to receive up to £1,000 of gross trading or miscellaneous income in a tax year without normally needing to report that income to HMRC.

The £1,000 figure applies to gross income, not profit.

That means it is measured before deducting costs such as:

• Inventory
• Marketplace fees
• Postage
• Packaging
• Mileage
• Software
• Advertising

HMRC’s current guidance states that where annual gross trading income is more than £1,000, the individual may be able to claim the trading allowance instead of deducting actual allowable expenses. (GOV.UK)

Example

Suppose you receive:

• £1,400 from reselling
• £650 in stock and selling costs
• £750 remaining before other tax considerations

Your gross trading income is still £1,400, even though the remaining amount after costs is lower.

That means you are above the £1,000 gross-income threshold.

Does earning over £1,000 mean you owe tax?

Not necessarily.

Going above £1,000 may mean you need to tell HMRC about your income, but the amount of tax due depends on factors including:

• Your allowable expenses
• Whether you claim the trading allowance
• Your total taxable income
• Your Personal Allowance
• Other employment or self-employment income

Selling Personal Possessions vs Trading

Selling personal possessions is not automatically treated as trading.

Examples may include selling:

• Clothes you no longer wear
• An old mobile phone
• Unwanted furniture
• Children’s toys
• Household items
• Used electronics

However, your activity is more likely to resemble trading when you regularly:

• Buy products specifically to resell
• Make products to sell
• Source stock from charity shops or wholesalers
• Sell similar products repeatedly
• Operate with the intention of making a profit
• Reinvest proceeds into more inventory
• Maintain an organised stock system

No single factor automatically determines whether you are trading. HMRC may consider the overall pattern and commercial nature of your activity.

Mixed selling activity

Many sellers use platforms such as eBay or Vinted for both:

• Personal decluttering
• Profit-focused reselling

In that situation, keep separate records for each type of sale.

Your trading-income figure should not automatically include every pound received from selling your own unwanted possessions.

A simple spreadsheet can record:

Date	Item	Sale type	Amount received	Item cost	Fees	Postage
12 May	Old winter coat	Personal item	£35	—	£0	£3.50
14 May	Sourced trainers	Trading	£60	£18	£6	£4

This separation makes it much easier to explain your figures if HMRC ever asks for supporting records.

What Are the Online-Platform Reporting Limits?

Digital platforms may be required to collect and report information about sellers to HMRC.

For sellers of goods, the usual reporting exclusion applies where the seller:

• Makes fewer than 30 sales in a calendar year, and
• Receives no more than €2,000, which HMRC describes as approximately £1,700

A seller who reaches 30 sales or exceeds the amount condition may have their details reported by the platform. (GOV.UK)

Platform reporting is not a tax threshold

This is one of the most important points on the page:

Being reported by eBay, Vinted or another platform does not automatically mean that you owe tax.

The platform rules determine whether seller information may be shared with HMRC.

They do not decide:

• Whether you are trading
• Whether the sales were personal possessions
• Whether you made a taxable profit
• How much tax you owe
• Whether you must register for Self Assessment

HMRC has also stated that there was no new tax introduced specifically for people selling unwanted possessions online. (GOV.UK)

For platform-specific guidance, read:

• Vinted HMRC Tax Rules 2026: What Casual UK Sellers Need to Know
• HMRC “Side Hustle Tax” 2026: What Vinted & eBay Sellers Need to Know

Why 30 Sales Does Not Mean “30 Sales Tax-Free”

The 30-sale figure is frequently misunderstood.

It is not:

• A tax-free allowance
• A limit below which profit is always tax-free
• Permission to operate a business without telling HMRC
• A replacement for the £1,000 trading allowance

It relates to whether a digital platform may exclude a seller from its reporting obligations.

For example, a seller could make:

• 20 sales
• £4,000 in trading income

The platform amount condition may be exceeded even though the seller completed fewer than 30 transactions.

Alternatively, a seller could complete:

• 35 low-value sales
• £900 received

The transaction condition may still mean the seller’s information is reportable, even though the money received is relatively low.

Neither scenario automatically determines whether tax is owed.

The Difference Between Revenue, Profit and Taxable Profit

Understanding these terms is essential when checking HMRC thresholds.

Revenue

Revenue is the total amount received from customers.

Example:

Selling price: £50
Buyer postage: £4
Total revenue: £54

Gross profit

Gross profit is revenue minus the cost of the item.

Revenue: £54
Item cost: £18
Gross profit: £36

Net profit

Net profit deducts additional selling expenses.

Gross profit: £36
Marketplace fees: £6
Postage: £4
Packaging: £1
Net profit: £25

Taxable profit

Taxable profit is calculated under HMRC rules after applying relevant allowable expenses, reliefs and allowances.

The £1,000 trading allowance and platform-reporting rules generally look at gross amounts rather than the profit you keep.

Use the SellerStack Reseller Profit Calculator to calculate the commercial profit from an individual sale before assessing your wider tax position.

When Might You Need to Tell HMRC?

You may need to review your position when:

• Your gross trading income exceeds £1,000
• You regularly buy products to resell
• You manufacture products for sale
• You operate multiple online shops
• Reselling forms part of an organised business
• You receive income from several side hustles
• HMRC contacts you about platform-reported information

The £1,000 allowance applies across relevant trading and miscellaneous income rather than providing a separate £1,000 allowance for every marketplace or activity. HMRC’s guidance notes that the allowance can apply across more than one business, but the overall allowance remains limited. (GOV.UK)

Example: selling on several platforms

Suppose your annual trading income is:

Platform	Gross trading income
eBay	£700
Vinted	£450
Facebook Marketplace	£300
Total	£1,450

You cannot normally treat each platform as having its own £1,000 trading allowance.

Your combined gross trading income is £1,450.

VAT Registration Threshold for UK Sellers

VAT is separate from the trading allowance and platform-reporting rules.

Businesses generally need to register for VAT when their VAT-taxable turnover exceeds £90,000.

HMRC currently applies two main tests:

1. Taxable turnover over the previous rolling 12 months
2. An expectation that taxable turnover will exceed £90,000 in the next 30 days

The registration threshold remains £90,000 under current GOV.UK guidance. (GOV.UK)

VAT uses turnover, not profit

A business could have:

• £95,000 in taxable sales
• £70,000 in stock and operating costs
• £25,000 remaining before tax

The VAT test is generally based on taxable turnover, not the £25,000 remaining after costs.

Rolling 12 months explained

The VAT test is not limited to:

• January to December
• April to April
• Your company accounting year

You generally need to monitor taxable turnover over each continuous 12-month period.

For example:

1 August 2025 to 31 July 2026
1 September 2025 to 31 August 2026
1 October 2025 to 30 September 2026

This is why growing sellers should update turnover records monthly.

Making Tax Digital for Income Tax

Making Tax Digital for Income Tax introduces digital record-keeping and reporting requirements for eligible sole traders and landlords.

The rollout is based on qualifying income:

Start date	Relevant qualifying-income threshold
6 April 2026	Over £50,000
6 April 2027	Over £30,000
6 April 2028	Over £20,000

HMRC determines the start date using qualifying income shown on an earlier Self Assessment return. (GOV.UK)

What counts as qualifying income?

Qualifying income can include gross income from:

• Self-employment
• Property

Where someone has both sources, HMRC may look at the combined qualifying income.

Example

Suppose someone receives:

• £24,000 gross self-employment income
• £10,000 gross property income

Their combined qualifying income may be £34,000.

That could place them above the £30,000 threshold for the relevant MTD implementation stage, subject to HMRC’s detailed rules.

What MTD may require

Affected users may need to:

• Keep digital records
• Use compatible software
• Send quarterly updates
• Complete the required year-end process

HMRC began the mandatory phased rollout from 6 April 2026 for eligible sole traders and landlords with qualifying income above £50,000. (GOV.UK)

Worked Example: Part-Time eBay Reseller

Consider a seller with the following figures:

Detail	Amount
Gross trading income	£4,800
Number of eBay sales	72
Amount received through eBay	£4,800
VAT-taxable turnover	£4,800
MTD qualifying income	£4,800

Trading allowance

The seller’s gross trading income is above £1,000.

They may need to tell HMRC about the activity and assess whether claiming actual expenses or the trading allowance produces the appropriate taxable-profit calculation.

Platform reporting

The seller completed more than 30 transactions and received more than approximately £1,700.

The platform may therefore report their information to HMRC.

VAT

Turnover of £4,800 is well below the current £90,000 VAT registration threshold.

Making Tax Digital

Qualifying income of £4,800 is below the scheduled mandatory MTD thresholds shown in the checker.

SellerStack takeaway

A seller can trigger the trading-income and platform-reporting checks while remaining far below the VAT and MTD thresholds.

That is why these rules must be assessed separately.

Common HMRC Mistakes Online Sellers Make

Assuming platform reporting means tax is owed

Reporting only means the platform may share seller information with HMRC.

It does not calculate taxable profit.

Using profit for the £1,000 check

The trading allowance threshold generally refers to gross income before expenses.

Counting personal sales as trading automatically

Selling your own unwanted possessions is not necessarily trading.

Treating each marketplace separately

Income from eBay, Vinted, Etsy, Amazon and other trading activities may need to be considered together.

Ignoring postage paid by buyers

Amounts received from customers may form part of gross receipts, even where some of that money is used to pay postage.

Waiting until year-end to organise records

Reconstructing hundreds of transactions months later is difficult and increases the risk of missing costs or reporting incorrect figures.

Confusing VAT turnover with profit

VAT registration looks at taxable turnover, not the amount remaining after expenses.

Assuming a platform statement is a tax return

A platform sales statement may help with record-keeping, but it does not replace your responsibility to determine the correct figures for HMRC.

Records UK Online Sellers Should Keep

Keep records of:

• Sale dates
• Item descriptions
• Selling prices
• Buyer postage received
• Refunds
• Marketplace fees
• Advertising charges
• Payment-processing costs
• Original purchase costs
• Postage expenses
• Packaging costs
• Mileage and sourcing expenses
• Personal-item sales
• Trading sales
• Platform statements
• Bank and payment-provider records

Where possible, label each transaction as:

• Personal sale
• Trading sale
• Unsure—review needed

This makes it easier to separate genuine business income from casual decluttering.

SellerStack HMRC Checklist

Before deciding whether you may need to tell HMRC, check that:

• □ I have separated personal sales from trading activity.
• □ I know my total gross trading income.
• □ I have combined relevant income across multiple platforms.
• □ I understand that the £1,000 threshold uses gross income.
• □ I know how many platform transactions I completed.
• □ I know the gross amount received through each platform.
• □ I understand that platform reporting does not mean tax is owed.
• □ I have calculated my actual selling expenses.
• □ I am monitoring VAT-taxable turnover on a rolling basis.
• □ I have checked whether Making Tax Digital could apply.
• □ I have retained invoices, receipts and platform statements.
• □ I will seek professional guidance where my position is unclear.

What to Do When the Checker Shows “Action May Be Required”

Do not panic.

A warning does not automatically mean you have made a mistake or owe a specific amount of tax.

Take these steps:

1. Review the figures entered

Confirm that you have not mixed:

• Personal-item proceeds
• Trading income
• Profit
• Turnover
• Calendar-year sales
• Tax-year income

2. Download your platform statements

Obtain sales records from each marketplace you use.

3. Separate personal and trading transactions

Classify each sale based on what was sold and why.

4. Calculate your business expenses

Record costs such as:

• Stock
• Fees
• Postage
• Packaging
• Advertising
• Software

5. Check official HMRC guidance

Rules can change, and individual circumstances differ.

6. Speak to a tax professional where necessary

Professional advice may be particularly useful where you:

• Sell through several businesses
• Trade internationally
• Are approaching the VAT threshold
• Have both property and self-employment income
• Operate through a partnership or company
• Have historic income that was not reported