About SoloTaxKit

SoloTaxKit is a set of free online tools for UK freelancers, sole traders and anyone with self-employed income. We want working out tax, VAT and invoices to take seconds, not an afternoon of spreadsheets.

What we offer

• UK Self-Employed Tax Calculator: Work out your Income Tax, Class 4 National Insurance and take-home pay from your profit.
• UK VAT Calculator: Add or remove VAT at 20%, 5%, 0% or a custom rate. Includes Flat Rate Scheme mode.
• Invoice Generator: Create a professional invoice, preview it live and download a PDF. Nothing leaves your browser.

How our tools work

Every tool runs entirely in your web browser. When you type a number, the calculation happens on your own device. Nothing is sent to our servers, and we have no database of users or figures. If you save an invoice draft, it is stored in your browser's local storage on your device, and you can clear it at any time.

Where our figures come from

Tax rates, thresholds and allowances come from official gov.uk guidance. Each calculator shows the tax year it uses. We review the figures when HMRC announces changes, usually after the Budget and before each new tax year starts on 6 April.

What we are not

We are not accountants, and SoloTaxKit is not a tax adviser. Our tools give estimates to help you plan. For decisions about your own tax affairs, check with HMRC or a qualified accountant. See our disclaimer for details.

Contact

Spotted a mistake, or have an idea for a new tool? Email us at hello@solotaxkit.com.