Corporation Tax
Director's Loan Accounts Explained in Plain English
A simple guide to director's loans, the s455 tax charge, what changes from April 2026, and how to file your CT600A correctly.
News · Ideas · Explainers
The Tax Optimiser journal
Plain-English writing on Making Tax Digital, software updates, deadlines and the UK tax changes that affect sole traders, landlords, small businesses and accountants.
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Accountancy Practice 5 min read
Working Papers Are Now Built Into TaxOptimiser
Attach documents to balances, raise review points in context and run fully customisable question sets - all inside the Trial Balance screen you already use.
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17 May 2026
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Corporation Tax
Limited Company Expenses You're Probably Forgetting to Claim
From home office costs to software subscriptions, here are the everyday limited company expenses owners miss - and how to capture them properly before you file.
Corporation Tax
Corporation Tax Marginal Relief: A Plain English Guide for Small Businesses
Marginal relief softens the jump from 19% to 25% Corporation Tax for companies with middle-band profits. Here's who gets it and how to claim it.
Company Accounts
What Is a Trial Balance? A Plain English Guide for Business Owners
A trial balance is just a tidy list of your bookkeeping totals - and it is the starting point for every set of company accounts and Corporation Tax return.
Making Tax Digital
Why HMRC Is Modernising UK Tax - And What It Means for You
HMRC's Transformation Roadmap is reshaping UK tax for sole traders, landlords and small businesses - here is the why, the global picture, and how spreadsheets still fit in.
Company Accounts
Companies House Presenter ID: What Business Owners Need to Know
Companies House has retired its old free filing portal and now wants a Presenter ID. Here's what that means, and how it differs from your HMRC code.
Company Accounts
FRS 105, FRS 102 Section 1A and FRS 102: Which One Is For You?
A plain-English guide to the three main UK financial reporting standards - what they are, who they are for, and how to choose the right one for your company.
What is bridging software for Making Tax Digital — and do you need it?
Bridging software connects your existing records to HMRC's systems, so you can meet your Making Tax Digital obligations without overhauling how you work
Making Tax Digital
MTD for ITSA
Quarterly updates are replacing the annual Self Assessment for many sole traders and landlords from April 2026 — here's what's changing, when it hits you, and how to get ready.
Company Accounts
Big Thresholds, Big Impact: What the 2025 Reporting Changes Mean for Your Busines
From 6 April 2025, UK company size thresholds rise by around 50%, and we explain what that means for your reporting, audit needs and day-to-day compliance.
Big Changes Are Coming: Get Ready to File Corporation Tax with Software from 2026
CT600 Companies House Corporation tax
Making Tax Digital
TOP 5 MTD FOR VAT MYTHS
Busting the biggest misunderstandings about Making Tax Digital (MTD) for VAT, so you know what really applies to your business and what you can safely ignore.
Accountancy Practice
We are so excited to win XDHAX : Xero’s most innovative use of their API.
TaxOptimiser has won Xero's first global developer challenge for the most innovative use of their API, and here's what that means for the accountants and small businesses we build for.
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