Making Tax Digital for Self-Employed Workers and Landlords: A Practical Guide to Avoiding Reporting Errors, Software Mistakes and HMRC Compliance Risks

This working draft presents a practical guide to HMRC's Making Tax Digital for Income Tax Self Assessment (MTD-ITSA) regime, written for self-employed workers, landlords, and their professional advisers. From April 2026, self-employed workers and landlords with gross qualifying income above £50,000 are required to maintain digital records and submit quarterly updates to HMRC using approved software. The book covers: the distinction between quarterly updates and tax returns; scope and threshold calculations; the full MTD compliance year including quarterly submissions and year-end adjustments; common income and expense recording errors; software misclassification risks across QuickBooks, FreeAgent, and Xero; legitimate expense claims frequently under-claimed; capital allowances and year-end adjustments; compliance risk signals and HMRC's Connect system; record-keeping templates; and a thirty-day action plan for the first quarterly deadline. The manuscript draws on HMRC's published administrative data, including the Measuring Tax Gaps 2025 report, and situates MTD within the broader context of UK tax gap reduction policy. WORKING DRAFT NOTICE: This manuscript is pending technical review by a qualified UK tax adviser. All figures, thresholds, deadlines, and rules should be verified against current HMRC guidance at gov.uk before being relied upon.