--- title: "Error Prevention Review in Cardiff | TCK Accounting" description: "A careful check of your self-employed tax return figures and records to reduce errors, support claims and lower the risk of HMRC penalties." canonical: "https://www.tckaccounting.co.uk/services/error-prevention-review-self-employed-returns" --- ![A person at a desk reviewing business documents and a checklist, reflecting preparation for accounting tasks.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fquickbooks-mtd-preconnection-checklist-hero.png%3Fv%3D1769183245309&w=1536&q=75&dpl=dpl_HkjxAMLz8SoKDEaYz6gDcGJLMf1v) Self-employed & partnership accounts # Error Prevention Review (Self-Employed Returns) [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) If you’re self-employed, small mistakes on your Self Assessment return can lead to avoidable tax, penalties, or time spent answering HMRC questions. An Error Prevention Review is a pre-submission check of your figures and supporting records, designed to spot common issues early and help you file with confidence. ## What the review covers A practical, compliance-focused review of your Self Assessment return and the evidence behind it, to help you submit accurate figures. - Sense-checking income and expense totals against your records. - Reviewing expense categories for common disallowable or misclassified items. - Checking treatment of capital items and one-off purchases. - Reviewing claims and reliefs (where relevant) for completeness and consistency. - Identifying missing information, duplicates, or timing issues (wrong tax year). - Flagging areas that may need clearer records if HMRC ever asks. ### Who this is for This service is designed for sole traders, freelancers and contractors who prepare their own figures or bookkeeping but want a professional safety check before filing. It is especially useful if you have had a busy year, mixed business and personal spending, multiple income streams, or you are filing self-employed pages for the first time. ### How the review works You share your draft return figures and the supporting records (for example, bookkeeping reports, bank statements, invoices, mileage logs, and expense evidence). We review for errors, inconsistencies, and missing items, then come back with a clear list of queries and recommended corrections. You stay in control of the final submission, with clarity on what to change and why. ### What you get afterwards You receive a concise summary of findings, the adjustments we recommend, and any record-keeping improvements that will reduce future risk. If anything needs deeper work, you will also get a clear next step, such as tidy-up bookkeeping, expense policy guidance, or a fuller tax review. [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) ## Frequently Asked Questions What do I need to provide for an Error Prevention Review? Usually your draft Self Assessment figures plus the records that support them, such as bookkeeping reports, invoices, and bank statements. If you track mileage or use your home for work, include those logs too. We will tell you exactly what is needed based on your setup. Will you submit my Self Assessment tax return to HMRC? This service is a pre-submission review, so the filing is typically done by you. We highlight what to correct and what evidence to keep. If you want us to handle the submission, ask about a full Self Assessment service. How long does the review take? Timing depends on how complete your records are and how complex your income and expenses are. Most reviews are completed quickly once we have everything we need. If we find gaps, we will confirm what is required to finish the check. What kinds of errors do you look for? Common issues include missing income, duplicated expenses, mixed personal and business costs, and items claimed in the wrong tax year. We also look for misclassified capital purchases and incomplete or inconsistent records. The aim is to help you file accurately and defensibly. Does this reduce the risk of an HMRC enquiry or penalty? No service can remove HMRC risk entirely, but an accurate return with good supporting records reduces avoidable red flags. If HMRC asks questions, clear evidence makes responding simpler. The review is designed to lower the chance of errors that trigger penalties. [Book a free consultation](https://www.tckaccounting.co.uk/redirect-contact) ## Related Services Complete your experience with these services - Self-Employed Deadline Support [View](/services/self-employed-deadline-support) - Self-Employed Tax Efficiency Support [View](/services/self-employed-tax-efficiency-support) - Self-Employed Accounts for Self Assessment [View](/services/self-employed-accounts-for-self-assessment) - Expense Categories Guidance (Travel, Rent, Supplies) [View](/services/expense-categories-guidance-travel-rent-supplies) Show more services - Allowable Expenses Review (Self-Employed) [View](/services/allowable-expenses-review-self-employed) - Self-Employed Record Collection Checklist [View](/services/self-employed-record-collection-checklist) - Self-Employed Profit Calculation [View](/services/self-employed-profit-calculation) - Partnership Accounts Preparation [View](/services/partnership-accounts-preparation) - Sole Trader Accounts Preparation [View](/services/sole-trader-accounts-preparation) ## Related Blog Posts - [![A computer on a desk in a small business office setting, displaying accounting software.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fhmrc-vat-software-editorial-uk-small-business.png%3Fv%3D1769183233536&w=1536&q=75&dpl=dpl_HkjxAMLz8SoKDEaYz6gDcGJLMf1v) ### MTD for VAT Penalties: What HMRC Says About Filing Without Functional Compatible Software HMRC says it may charge a penalty of up to £400 for every VAT return filed without functional compatible software under MTD for VAT. 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