Prompt Details
Model
(claude-5-5-sonnet)
Token size
830
Example input
[income and expenses list]: Vinted/eBay sales £2,400; bought stock (clothing to resell) £950; eBay fees £180; postage £210; printer ink and shipping labels £35; mobile phone bill £420 (used roughly 30% for business)
[VAT registered yes or no]: No
[home working hours per month]: 40
[business mileage this tax year]: 0
Example output
Input: income and expenses list: "Vinted/eBay sales £2,400; bought stock (clothing to resell) £950; eBay fees £180; postage and packaging £210; printer ink and labels £35; phone bill £420/year, used about 30% for business"; VAT registered: No; hours worked from home per month: 40; business mileage this tax year: 0
1. TRADING ALLOWANCE CHECK
Allowable expenses come to £1,621 (see Box table below), which beats the £1,000 trading allowance, so claim actual expenses, not the trading allowance.
2. EXPENSE CATEGORISATION
Box 15 Turnover: £2,400
Box 17 Cost of goods bought for resale: £950
Box 22 Phone, stationery and office costs: £35 (ink/labels) + £126 (30% of £420 phone) + £120 (use of home, see step 4) = £281
Box 28 Other allowable business expenses: £180 (eBay fees) + £210 (postage/packaging) = £390 — platform fees and postage don't have their own box, so they sit here.
3. COMMONLY-MISSED EXPENSES
You haven't mentioned: any paid listing/boost fees on Vinted or eBay, a card-reader or PayPal processing fee if you take payments that way, or storage/stationery for packing materials beyond labels. Worth checking your bank statement for these.
4. USE OF HOME CALCULATION
40 hours/month falls in the 25–50 hour band: £10/month × 12 = £120/year, added into Box 22 above.
5. MILEAGE CALCULATION
No business mileage given, so £0 added to Box 18.
6. SUMMARY
| Box | Category | Total (£) |
|---|---|---|
| 15 | Turnover | 2,400.00 |
| 17 | Cost of goods | 950.00 |
| 22 | Phone/office/use of home | 281.00 |
| 28 | Other allowable expenses | 390.00 |
Total turnover: £2,400.00
Total allowable expenses: £1,621.00
Estimated net profit: £779.00 (before personal allowance and tax)
This is an organisational aid, not formal tax advice — check current rates and thresholds on gov.uk or with an accountant before filing.
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CLAUDE-5-5-SONNET
Turns a messy list of income and expenses into HMRC Self-Employment (SA103S) box-by-box totals — ready to enter into Self Assessment or hand to your accountant. Built for UK sole traders, freelancers and online sellers (eBay, Etsy, Vinted). Flags commonly-missed allowable expenses, compares the £1,000 trading allowance against your actual expenses, and calculates mileage and use-of-home deductions automatically.
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Added 4 days ago
