Getting Started with Making Tax Digital (MTD) for Income Tax

Overview

Making Tax Digital (MTD) for Income Tax Self Assessment (ITSA) is a major initiative by HM Revenue & Customs (HMRC) to modernize the UK tax system. Under MTD, paper-based accounting and annual tax returns are being replaced with mandatory digital record-keeping and regular online updates.

Instead of filing a single, retroactively compiled Self Assessment tax return (SA100) at the end of the tax year, MTD requires eligible individuals to maintain digital financial records and submit periodic updates to HMRC directly through recognized software like Maxim Money.

Who Does MTD Apply To?

MTD for Income Tax applies to self-employed individuals (sole traders) and individual property landlords who meet specific gross income thresholds:

Note on Limited Companies: MTD for Income Tax applies exclusively to unincorporated individual income. Limited companies pay Corporation Tax and are not subject to MTD ITSA rules.

The MTD Reporting Cycle: How It Works

Under MTD, the annual tax reporting process is split into two primary components: Quarterly Updates throughout the year and a Final Declaration at year-end.

       [ 1. Digital Record Keeping ]

   Continuous income & expense logging in Maxim Money

               ↓

       [ 2. Cumulative Quarterly Updates ]

               ↓                    

       [ 3. Final Declaration (Crystallisation) ]

   Submit non-business income, claim reliefs & lock the tax year

1. Continuous Digital Record Keeping

Under HMRC guidelines, taxpayers must maintain digital records of every business transaction (income and expenses). Hand-written ledgers or paper receipts alone are no longer compliant. Maxim Money acts as your central digital repository, logging transactions in real time.

2. Cumulative Quarterly Updates

Every three months, you submit a summary of your income and expenses to HMRC directly through Maxim Money.

Quarterly updates under MTD ITSA are cumulative, meaning each submission covers your financial activity from the start of the tax year (6 April) up to the end of that quarter:

•        Quarter 1: 6 April – 5 July (3 months)
•        Quarter 2: 6 April – 5 October (6 months cumulative)
•        Quarter 3: 6 April – 5 January (9 months cumulative)
•        Quarter 4: 6 April – 5 April (12 months cumulative)

Because updates are cumulative, any expenses or income missed in Quarter 1 are automatically captured in Quarter 2 without needing to formally amend earlier submissions.

3. Final Declaration & Tax Calculation

At the end of the tax year, once all quarterly updates have been submitted, you finalize your tax year in three simple steps:

1. Review Your Full Tax Picture: Review your year-to-date summary and add any non-business income streams (such as employment income, UK savings interest, or dividends) along with any applicable tax reliefs.
2. Fetch Your Official Tax Calculation: Request an official, real-time Tax Calculation directly from HMRC, giving you complete clarity and peace of mind over your final liability before filing.
3. Submit Your Final Declaration: Formally sign off on your tax year with a single submission, seamlessly replacing the traditional paper/online SA100 tax return.

Maxim Money Product Roadmap:

Maxim Money fully supports digital record-keeping and direct Quarterly Updates today. Because Maxim Money already tracks your complete financial ecosystem, we are uniquely built to automate your End-of-Year Calculations and Final Declarations well ahead of the April 2027 MTD threshold expansion.

The Maxim Money Advantage: Built for Your Entire Financial World

Most bank-led MTD tools only see a single business bank account. While that works for basic quarterly updates, it leaves a massive blind spot at year-end when HMRC requires you to report your non-business income, dividends, savings interest, capital gains, and charitable giving.

Maxim Money is fundamentally different:

• Your Complete Financial Ecosystem in One Place: Because Maxim Money tracks your wider financial world — from investment portfolios to personal savings and donations — you won't have to manually gather spreadsheets, dividend vouchers, or bank statements when tax season arrives.
• Direct HMRC API Integration: Securely connect your Government Gateway account to submit updates directly to HMRC’s live servers with a single click.
• Real-Time Tax Visibility: Get ongoing estimates of your upcoming tax position after every update — eliminating year-end tax bill surprises.
• Seamless Year-End Transition: By linking your day-to-day business tracking with your broader personal finances, moving from quarterly updates to your final tax calculation becomes a natural, effortless process.

Next Steps: Setting Up MTD in Maxim Money

Now that you understand the MTD requirements, follow the guides below to connect your account and start filing:

1. Connecting Maxim Money to HMRC
2. Setting up your MTD Business
3. Submitting your first Quarterly Update