All calculators & tools
12 free tools and counting — each one shows its working, states its assumptions, and links the official source.
UK Contractor & Tax Tools
View category →CIS Tax Refund Calculator
If you work under the Construction Industry Scheme, your contractor takes tax off before you're paid — and most subcontractors have paid too much. This works out a rough estimate of what you might be owed.
Open calculatorCompany Car BIK Calculator
A company car is a taxable perk. How much you pay depends on the car's value, its emissions and your own tax band — electric cars are taxed far more lightly than petrol or diesel.
Open calculatorCorporation Tax Calculator
Company profit isn't taxed at a single flat rate. This works out your corporation tax including marginal relief, and shows the effective rate you'll actually pay.
Open calculatorIR35 Take-Home Calculator
An IR35 determination can be worth thousands a year. This compares your estimated take-home pay inside versus outside IR35, so you can see exactly what the decision costs you.
Open calculatorLate Filing & Late Payment Penalty Calculator
Missed the Self Assessment deadline? Penalties stack up the longer you leave it. This estimates what filing and paying late is likely to cost you.
Open calculatorPayment on Account Calculator
That bigger-than-expected January bill is usually payments on account. This works out what you'll owe in January and July, and whether they apply to you in the first place.
Open calculatorSide Hustle Tax Calculator UK
Selling online, freelancing at weekends or doing a bit of tutoring? Here's a rough idea of how much of your side income to keep back for tax.
Open calculatorUmbrella vs Limited Company Calculator
Two contractors on the same day rate can end up with very different take-home pay depending on how they're set up. This compares the two routes side by side.
Open calculatorDividend Tax Calculator
Dividend tax rates went up in April 2026, so a strategy that worked last year might cost you more now. Enter your figures to see what you'll actually pay this tax year.
Open calculatorSalary vs Dividend Calculator
For a single-director company, how should you take money out — all salary, or a small salary plus dividends? Enter the profit you want to extract and see which leaves more in your pocket this tax year.
Open calculatorHome Project Cost Tools
View category →Concrete & Gravel Calculator
Running short mid-pour is every DIYer's nightmare. Enter your slab dimensions to get the volume in cubic yards, the number of bags, and a rough cost — with a waste allowance built in.
Open calculatorFence Cost Calculator
Before you ring a contractor or load up the trolley, get a grounded estimate. Enter your fence length and material to see the posts and concrete you'll need, the material cost, and an installed price range.
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