# HMRC £1,000 Trading Allowance vs Actual Allowable Expenses on SA103S: UK Sole Trader Guide (2026/27)

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- **Last Verified:** Sun Nov 01
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- **Summary:** HMRC £1,000 Trading Allowance vs actual allowable expenses on SA103S (Box 10.1 vs Boxes 17–30): when to register for Self Assessment & CIS rules for 2026/27.

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# HMRC £1,000 Trading Allowance vs Actual Allowable Expenses on SA103S: UK Sole Trader Guide (2026/27)

**Short answer: Under Trading Allowance HMRC rules (*ITTOIA 2005 Part 6A*), the UK £1,000 tax-free allowance gives sole traders and subcontractors two benefits: (1) if your total gross self-employed turnover across all trades is £1,000 or less in a tax year, it is tax-free and you usually do not need to register for Self Assessment; (2) if turnover exceeds £1,000, you can claim a flat £1,000 in `Box 10.1` of form `SA103S` instead of actual receipts and 45p/mile mileage in `Boxes 17–30`. Once real expenses exceed £1,000, claiming actual expenses saves more tax.**

> **⚡ Instant UK Sole Trader `SA103S` Expense, `45p/mile` Mileage & £1,000 Trading Allowance Calculator (£GBP):** Compare your £1,000 Trading Allowance against your actual tool receipts and 45p/mile van mileage in the interactive **GBP Deduction & SA103 Calculator** right below, save your first 5 invoices, CIS statements, or receipts in the **[iCloud Web Workspace (5 Free Saves)](/keel/workspace/)**, explore the **[UK Self Assessment SA103 App Store Edition](/keel/cpp/uk-self-assessment-sa103/)** and **[UK Sole Trader & VAT Edition](/keel/cpp/uk-sole-trader-vat/)**, or **[Download Keel Free on the App Store (£0/mo)](https://apps.apple.com/us/app/keel-invoice-maker-receipts/id6786659713?ppid=72e63a40-1434-4f95-a3dc-62eceeb19abd)** (`uk-self-assessment`). — click **`🔗 Embed / CSV Template`** to export

Every tax year before the **5 October registration deadline** and the **31 January online Self Assessment filing deadline**, thousands of UK sole traders, weekend tradies, CIS subcontractors, and freelancers make a costly mistake on their **`SA103S` (Self-employment Short)** pages: either they claim the **£1,000 Trading Allowance (`Box 10.1`)** when their van mileage alone is worth £2,700+, or they try to enter both `Box 10.1` and actual expenses in `Boxes 17–30`—which HMRC's online system automatically rejects.

Below is the official **[HMRC Tax-free allowances on property and trading income](https://www.gov.uk/guidance/tax-free-allowances-on-property-and-trading-income)** and **[SA103S Notes](https://www.gov.uk/government/publications/self-assessment-self-employment-short-sa103s)** guide for **2025/26 and 2026/27**. For related UK rules, see our [SA103S and SA103F box-by-box guide](/keel/uk-sa103s-and-sa103f-self-employed-form-guide/), [UK sole trader allowable expenses checklist](/keel/uk-sole-trader-allowable-expenses-and-receipt-rules/), and [45p/25p self-employed mileage allowance guide](/keel/uk-self-employed-mileage-allowance/).

## How does the HMRC £1,000 Trading Allowance work in 2026/27?

Introduced under *Part 6A of the Income Tax (Trading and Other Income) Act 2005 (ITTOIA 2005)*, the **£1,000 Trading Allowance** applies to **gross trading and miscellaneous income** (total sales before deducting any expenses, materials, or CIS deductions—**not** net profit):

| Your Annual Gross Self-Employed Turnover (`Box 9` on `SA103S`) | Do You Need to Register for HMRC Self Assessment? | Should You Claim `Box 10.1` (£1,000 Trading Allowance) or `Boxes 17–30` (Actual Expenses & Mileage)? |
|---|---|---|
| **£1,000 or less** *(full exemption)* | **No** — unless HMRC sends you a notice to file, you want to claim a trading loss, or you need to reclaim **20% CIS tax deducted** at source | Tax-free automatically; if you do file a return (e.g., to get a CIS refund), enter turnover in `Box 9` and claim the matching amount (up to £1,000) in `Box 10.1` so taxable profit (`Box 28` / `Box 31`) is **£0** |
| **Over £1,000, with total actual expenses & mileage UNDER £1,000** *(partial relief)* | **Yes** — must register with HMRC for Self Assessment by **5 October** following the end of the tax year (`5 April`) | **Claim `Box 10.1` (£1,000 Trading Allowance)** and leave `Boxes 17–30` (`SA103S`) and capital allowances (`Boxes 23–26`) completely blank |
| **Over £1,000, with total actual expenses & mileage OVER £1,000** | **Yes** — must register and file `SA103S` (or `SA103F` if turnover is £90,000+) by **31 January** | **Do NOT use `Box 10.1`** — leave `Box 10.1` blank and claim your actual allowable expenses, tools, materials, and **45p/mile mileage** in **`Boxes 17–20`** (or the single total in **`Box 20`** if turnover is under £90,000) |
| **Over £1,000, where actual expenses exceed turnover (Trading Loss)** | **Yes** | **Do NOT use `Box 10.1`** — the £1,000 Trading Allowance can never reduce your profit below £0 to create a loss; claim actual expenses in `Boxes 17–20` so you can set your trading loss (`Box 29` / `Box 33`) against PAYE wages or future profits |

## What are the 4 strict HMRC exclusions where you CANNOT use the £1,000 Trading Allowance?

Even if your expenses are under £1,000, HMRC prohibits claiming the Trading Allowance (`SA103S Box 10.1`) in four situations:

1. **You cannot combine `Box 10.1` with ANY actual expenses, 45p/mile mileage, or Annual Investment Allowance (AIA):** It is strictly an **either/or election** each tax year. You can switch between `Box 10.1` in one tax year and actual expenses (`Boxes 17–30`) in the next tax year as your business grows.
2. **One £1,000 allowance across all sole trader trades combined:** If you have two self-employed trades (for example, weekend electrical work and a delivery side hustle), you only get **one £1,000 Trading Allowance in total** across both `SA103` pages—not £1,000 per trade. *(However, the £1,000 Property Allowance on `SA105` is separate and can be claimed alongside the Trading Allowance).*
3. **No partnership income:** You cannot claim the £1,000 Trading Allowance against income from a business partnership (`SA104`).
4. **Connected-company / employer rule (*ITTOIA 2005 s.783AO*):** You cannot use the £1,000 Trading Allowance if ANY part of your self-employed trading income comes from:
   - An **employer** (or a spouse/civil partner's employer) for whom you also work on PAYE, OR
   - A **close company** (such as a limited company) in which you—or a person connected to you—are a shareholder or director.

## Why do CIS subcontractors & van-driving tradies almost always beat the £1,000 allowance?

If you are a construction subcontractor under the **[Construction Industry Scheme (CIS)](/keel/uk-cis-deduction-calculator-and-20-percent-tax-guide/)** or a mobile tradesperson driving to customer sites, two numbers show why tracking actual receipts and mileage beats `Box 10.1` almost immediately:

1. **Just 2,223 Business Miles Beats £1,000:** Under HMRC's [simplified mileage rate of **45p per mile**](/keel/uk-self-employed-mileage-allowance/) for the first 10,000 business miles, driving just **45 miles a week** (`2,223 miles/year × £0.45`) equals **£1,000.35** in tax-deductible travel (`SA103S Box 12` / `Box 20`)—before you even add a single Screwfix tool receipt, public liability insurance policy, safety boots, or mobile phone bill.
2. **CIS Subcontractors With Gross Turnover Under £1,000 Still Need to File to Reclaim 20% Tax:** If a contractor paid you £900 gross for a week's labour and deducted **£180 (20% CIS)**, your gross turnover (`Box 9`) is under £1,000—meaning you owe **£0 tax**—but HMRC will only refund that **£180 CIS deduction** after you submit `SA103S` with `£900` in `Box 9`, `£900` in `Box 10.1`, and `£180` in **`Box 38` (Total CIS deductions taken from your payments)**.

## How much tax does claiming actual expenses save vs `SA103S Box 10.1` (worked example)?

Suppose Callum is a PAYE electrician in Manchester earning £38,000/year (20% Basic Rate taxpayer) who also does weekend domestic jobs under his sole trader UTR, bringing in **£8,500 gross turnover (`Box 9`)** in **2025/26**:
- He drove **3,600 business miles** to weekend jobs (`3,600 × 45p` = **£1,620** mileage deduction).
- He spent **£940** at CEF and Screwfix on consumer units, cable, test leads, and public liability insurance (**£2,560 total actual expenses**).

| Tax Calculation on `SA103S` | If Callum Lazily Ticks **`Box 10.1` (£1,000 Trading Allowance)** | If Callum Scans Receipts & Logs Mileage in **`Box 20` (£2,560 Actual Expenses)** |
|---|---|---|
| **Gross Turnover (`Box 9`)** | £8,500 | £8,500 |
| **Deduction Claimed on `SA103S`** | **£1,000** (`Box 10.1`) | **£2,560** (`Box 12` + `Box 17` / single total in `Box 20`) |
| **Taxable Net Profit (`Box 28` / `Box 31`)** | **£7,500** | **£5,940** |
| **Income Tax (`20%`) + Class 4 NIC Impact** | **£1,500+ tax bill** | **£1,188 tax bill — Callum saves £312+ in cash tax** just by photographing his receipts and logging his mileage |

## How does Keel compare with QuickBooks and FreeAgent for UK sole traders?

| Feature | **QuickBooks Self-Employed / Sole Trader UK** | **FreeAgent UK** | **Keel (`£0/mo` UK Self Assessment Edition)** |
|---|---|---|---|
| **Monthly Price (£GBP)** | **£10 to £28+/month + VAT** | **£19 to £33+/month + VAT** (unless tied to specific bank accounts) | **£0/mo Core App** (No mandatory monthly subscription; no bank link required) |
| **`SA103S` Box-by-Box Expense & `Box 10.1` Comparison** | Basic | Yes | **Yes — automatically compares your actual receipts + 45p mileage against the £1,000 Trading Allowance** |
| **CIS Subcontractor (`20%` / `30%`) Invoices & Quotes** | Extra tier required | Yes | **Yes — built-in CIS labour/material split invoices, Screwfix receipt OCR & 45p/25p mileage log** |

## Frequently asked questions

**Is the HMRC £1,000 Trading Allowance based on turnover or profit?**

It is based on **gross turnover (total sales before any expenses or CIS deductions are taken off)**, not net profit. If you invoice clients £1,400 and spend £600 on materials (leaving £800 profit), your gross turnover is **£1,400**—so you **must** register for Self Assessment by **5 October** and file a tax return, even though your net profit is under £1,000.

**Can I claim both the £1,000 Trading Allowance and the £12,570 Personal Allowance?**

Yes. If you have no other PAYE employment income, you can use the **£1,000 Trading Allowance** (`SA103S Box 10.1`) on top of your **£12,570 Personal Allowance**, allowing up to **£13,570 of gross self-employed income** before any 20% Income Tax or 6% Class 4 National Insurance (`above £12,570`) is due—though if your actual expenses are over £1,000, claiming actual expenses alongside your £12,570 Personal Allowance saves even more.

**Can I switch from the £1,000 Trading Allowance to actual expenses next year?**

Yes. The election in `Box 10.1` of `SA103S` is made year by year. You can claim `Box 10.1` in your first part-year of trading when expenses are small, and switch to actual expenses and 45p/mile mileage in `Boxes 17–30` the following tax year without asking HMRC for prior permission.

**Do I still need to keep receipts if I plan to claim the £1,000 Trading Allowance?**

Yes. Under HMRC Self Assessment record-keeping rules, even if you elect `Box 10.1` on `SA103S`, you must still keep records of all your **sales invoices, bank receipts, and CIS payment and deduction statements** for at least **5 years after the 31 January filing deadline** to prove your gross turnover figure in `Box 9`.

**Why should a CIS subcontractor file SA103S even if their gross turnover is under £1,000?**

When a contractor deducts **20% or 30% CIS tax** from your labour payments, HMRC holds that money on account. Even if your total gross turnover is under the £1,000 Trading Allowance and your tax bill is £0, filing `SA103S` with your CIS deductions entered in **`Box 38`** is the only way to trigger your **HMRC CIS tax refund**.

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