TaxCalcTaxCalc 
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TaxCalc (AvitusTaxCalc.exe). You can see your tax liability as you progress through the program and even create 'what if'...
TaxCalc is designed to guide you through your tax return—whether it’s your own or an immediate family member’s—using a clear, step-by-step process. With free email and telephone support, you always have help on hand. This easy HMRC tax return app shows your tax liability as you go and lets you run quick “what-if” scenarios to plan for future income.
Thoughtfully built to bridge the gap between taxpayers and HMRC forms, the TaxCalc Personal range makes self assessment straightforward and stress-free. Enjoy simple tax filing software for the UK that keeps you fully in control, calculating liabilities or rebates instantly as you progress. It’s one of the best self assessment tools for anyone seeking clarity, accuracy, and peace of mind.