The Employed and Self-Employed Tax Calculator is a practical tool for individuals in the UK who earn income from both employment and self-employment. It’s ideal for people with side hustles, freelancing gigs, or part-time businesses alongside a regular job. The calculator helps you estimate how much tax and National Insurance you’ll owe by combining your PAYE (Pay As You Earn) salary with self-employed earnings. For example, if you earn £25,000 from your job and £15,000 from self-employment, the calculator applies your personal allowance and adjusts tax bands accordingly to give you an accurate tax liability. It also factors in deductible business expenses such as home office costs, equipment, or travel. Even if you’re unsure about all the expenses you can claim, the tool offers guidance and estimates to help you plan ahead. It’s especially helpful for people new to mixed-income tax rules and looking to avoid unexpected tax bills.