Free tools for the self employed.
Everything a UK sole trader needs to stay on top of the money and the tax, free to use, no account, no card. Built by the team behind Lekhio, the back office on your phone or in your browser.
Tax calculator
Your tax, National Insurance, take home and what to set aside. See how much your expenses save you.
Open tax calculator →CIS tax refund estimator
Subcontractor? CIS is taken off your pay before you see it, and most subbies are owed money back. See your likely refund in seconds.
Open cis tax refund estimator →Mileage claim calculator
Every business mile comes off your profit. See what yours are worth on the 2026/27 rates, and whether mileage beats buying the vehicle through the business.
Open mileage claim calculator →Invoice & quote generator
A clean, professional invoice or quote in two minutes. Ready made templates by trade. Save as PDF.
Open invoice & quote generator →Can I claim it?
The real rules on what you can and cannot claim, the grey areas included. All within the law.
Open can i claim it? →National Insurance checker
Class 1, 2 and 4 explained with your numbers, and whether your State Pension year is safe. The £190 decision nobody tells you about.
Open national insurance checker →Student loan checker
Every plan, the real thresholds, and the January lump the self employed never see coming. Know it before it lands.
Open student loan checker →Landlord tax calculator
Rent out property? Your bill under the current rules and under the new 22%, 42% and 47% property rates from April 2027, a year before they bite. Section 24 included.
Open landlord tax calculator →Rent a Room checker
A lodger in your own home can earn you £7,500 tax free. Over the limit there is an election most people never make. Check yours in seconds.
Open rent a room checker →Sole trader vs limited
The honest 2026/27 comparison: corporation tax, the new dividend rates, employer NI, and the costs the folklore forgets. Your number decides.
Open sole trader vs limited →File your own return
A step by step walkthrough by trade, so you can do your Self Assessment yourself and stop paying for a short job.
Open file your own return →MTD prep, for the basics
For a straightforward return, profits, losses and the essentials, we will get your quarterly update ready free. You send it to HMRC yourself. Join the list.
Open mtd prep, for the basics →Register your business
Sole trader, limited, VAT, PAYE and CIS, explained simply with the real 2026 costs and deadlines.
Open register your business →The tax dates that matter, 2026 to 2027.
Miss one and HMRC charges a penalty. Your figures for every one of these are kept ready inside your Lekhio, so when the date comes the work is already done.
A general guide, not tax advice. MTD quarterly dates apply if you are within Making Tax Digital. Always check your own deadlines with HMRC.
Free tools are the start. Lekhio does the rest.
It reads your receipts, finds your reliefs, makes your invoices for you to send, and keeps you ready for tax. You always approve before anything reaches HMRC.
Start free