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Self‑assessment tax places responsibility on sole traders to calculate and declare their own income tax and National Insurance. Understanding registration deadlines, allowable business expenses, payment on account rules, and digital record‑keeping is essential. Accurate bookkeeping and timely submissions help minimise liabilities, avoid penalties, and keep cash flow predictable and stable. ~ https://www.slideshare.net/slideshow/how-to-calculate-tax-as-a-sole-trader-for-self-assessment/275769056