QuarterPerfect – UK Tax Compliance Bookkeeping

A bookkeeping tool designed specifically for UK sole traders and landlords to comply with MTD ITSA quarterly filing requirements. Built by a junior developer using AI, it solves the pain of managing tax deadlines and quarterly submissions.

HMRC's Making Tax Digital for Income Tax Self Assessment rollout — now confirmed for sole traders and landlords earning above £50k from April 2026, with lower thresholds following — creates a hard compliance deadline that forces behaviour change, which is the best kind of forcing function for fintech adoption. FreeAgent and QuickBooks both serve this space but are generalist tools with pricing and complexity that overshoots what a sole trader with a few rental properties actually needs. The $2k–10k/mo revenue band is realistic for a niche compliance tool if priced around £10–20/month, but it requires meaningful volume — hundreds of paying users — which is the constraint. The biggest risk is that HMRC's own free MTD-compatible tools, or low-cost bolt-ons from existing accountancy software, commoditise the core filing feature before the product builds enough retention around broader bookkeeping workflows.