After 4 years of freelancing in the UK, I kept building small tools to solve problems I hit repeatedly. They're all free, browser-based, and don't need an account.
Here's the full set:
1. Day Rate Calculator
Input your target salary, expenses, holidays, and tax rate. Get a recommended day rate that actually covers everything.
→ landolio.com/tools/day-rate-calculator
2. Self-Employed Tax Calculator
Full UK tax breakdown: Income Tax bands, Class 2 + Class 4 NI, student loan, and take-home. Updated for 2025/26.
→ landolio.com/tools/self-employed-tax-calculator
3. Late Payment Interest Calculator
Most UK freelancers don't know they can legally charge interest on overdue invoices. This calculates exactly what a client owes under the Late Payment of Commercial Debts Act 1998.
→ landolio.com/tools/late-payment-interest-calculator
4. Invoice Generator
Create a proper invoice, preview it, download PDF. Handles VAT, multiple line items, UK date format.
→ landolio.com/tools/invoice-generator
5. Payment Reminder Generator
Paste invoice details, pick escalation level (friendly / firm / final notice), get a copy-paste email.
→ landolio.com/tools/payment-reminder-generator
6. Client & Project Tracker
Track clients, projects, invoices. Dashboard with revenue, outstanding, overdue. CSV export. All in localStorage.
→ landolio.com/tools/freelancer-client-tracker
7. Cash Flow Forecast
3/6/12 month forecast. Enter expected income and expenses, see gaps before they happen.
→ landolio.com/tools/cash-flow-forecast
8. Business Expense Tracker
Track by HMRC category. Spending breakdown, running totals, CSV export for tax return time.
→ landolio.com/tools/expense-tracker
9. Mileage Calculator
HMRC-approved rates for cars (45p/25p), vans, motorcycles, bicycles. Shows actual tax saving.
→ landolio.com/tools/mileage-allowance-calculator
10. MTD Readiness Checker
8 questions. Tells you if Making Tax Digital affects you, what software you need, and your deadlines. MTD goes live 6 April 2026 — 20 days away.
→ landolio.com/tools/mtd-readiness-checker
All vanilla HTML/JS. No frameworks, no backend, no tracking. Your data never leaves your browser.
Built these for myself originally. Published them because I kept emailing links to freelancer friends who asked the same questions.
What tool do you wish existed? Happy to build it if there's demand.
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