UK Limited Company Accounting 101: A Beginner’s Guide to Your First Year (Deadlines, Records, VAT)

by Ariful | Mar 17, 2026 | UK Accounting

Understand Your First Accounting Period (It Sets Every Deadline)

Your first accounting period starts on your incorporation date and usually ends on the last day of the same month the following year. This often makes your first period slightly longer than 12 months. That date then drives your statutory accounts deadline and your corporation tax timeline.

For example, if you incorporated on 15 May 2025, your accounting reference date would be 31 May 2026. Set this date in your calendar now. Everything else follows from it.

Mark These Deadlines (Penalties Are Automatic)

Missing deadlines triggers automatic fines from Companies House and HMRC. They escalate. Protect your cash flow by treating these as non-negotiable:

1. File Statutory Accounts (Companies House): In your first year, you must file within 21 months of incorporation. After that, it’s 9 months after your year end.
2. Pay Corporation Tax (HMRC): You must pay Corporation Tax 9 months and 1 day after your accounting period ends. Payment is due even if your final accounts filing is still in progress.
3. File Your Company Tax Return (CT600): You must file within 12 months of your accounting year end.

Do this monthly: update bookkeeping, reconcile the bank, and review taxes. This prevents last-minute errors and helps you file on time, every time.

Keep These Records for 6 Years (HMRC Will Expect Proof)

HMRC requires you to keep business records for at least 6 years. If HMRC asks, you must be able to evidence income, costs, and taxes with clear documentation. No gaps. No “best guesses”.

Keep these records consistently:

• Sales evidence: invoices and platform reports for Shopify, Amazon, and B2B sales.
• Purchase receipts and bills: including software, advertising, subscriptions, freight, and professional fees.
• Bank statements and card statements: always use a dedicated business account to keep transactions clean.
• Payroll records: payslips, RTI submissions, and director salary documentation where applicable.

This is where structured systems pay off. With a proper setup, you capture transactions monthly, attach source documents, and keep a complete audit trail—so your year-end is fast, accurate, and far less stressful.

VAT: Register on Time (Or You Create Backdated Risk)

VAT is one of the fastest ways a growing business becomes unintentionally non-compliant. If your taxable turnover exceeds £90,000 in any rolling 12-month period, you must register for VAT. This is not optional. Late registration can mean backdated VAT bills, penalties, and hours of clean-up.

Many businesses also choose voluntary VAT registration before the threshold. The benefits are straightforward:

• Reclaim VAT: claim back VAT on eligible business purchases.
• Look established: helpful for B2B credibility and supply chain conversations.
• Scale smoothly: you implement the right process before growth forces it.

With a structured VAT workflow, you track the rolling threshold monthly and prepare returns with clean reconciliations—so VAT doesn’t become a surprise problem.

Why Structure Matters: Cross-Border Considerations

Many accountants can file UK accounts. The difference is whether your accounting system is built for modern, cross-border trading from day one.

If you sell on Amazon Germany, run Shopify in the USA, or operate across multiple jurisdictions, you need a process that keeps records consistent across platforms, currencies, and tax rules.

Why This Matters in Your First Year (Not “Later”)

• Cross-border VAT: EU selling can trigger OSS/IOSS considerations. Getting it wrong can delay goods at customs and create unexpected VAT liabilities.
• Multi-currency bookkeeping: USD/EUR/GBP must be reconciled properly so your reports reflect real margins, not distorted FX noise.
• International compliance: you need to spot where you may create additional tax obligations, so you avoid duplicate reporting and expensive fixes.

A structured system now prevents painful rework later. Choosing an accountant with cross-border experience means you build clean accounts that scale with you.

Your First Year Checklist: A Step-by-Step Guide

To ensure a smooth first year, follow this simple checklist:

1. Appoint a Professional: Don’t DIY your accounts. A qualified accountant will likely save you more in tax than they cost in fees.
2. Set Up Cloud Accounting: Connect your bank feeds and sales channels (Amazon, eBay, Shopify) immediately.
3. Review VAT Monthly: Track your rolling 12-month turnover. Don’t wait for the end of the year to see if you’ve crossed the £90,000 limit.
4. Set Aside Tax Money: As a rule of thumb, move 20-25% of your profit into a separate savings account so you aren’t caught short when the Corporation Tax bill arrives.
5. Plan for International Growth: Even if you only sell in the UK now, structure your accounts to handle cross-border VAT later.

FAQ (New UK Limited Company Owners)

When is my first set of accounts due at Companies House?

Your first statutory accounts are due 21 months after incorporation. After your first year, accounts are due 9 months after your company year end. File on time to avoid automatic late-filing penalties.

When do I have to pay Corporation Tax?

You must pay Corporation Tax 9 months and 1 day after your accounting period ends. Pay on time to avoid interest and late payment consequences.

When is my Company Tax Return (CT600) due?

Your CT600 must be filed within 12 months of your accounting period end. File on time to avoid HMRC late filing penalties.

How long must I keep business records?

You must keep all business records for at least 6 years. HMRC can request evidence of income, costs, and taxes at any point during this period. Use a cloud system to store and organize documents consistently.

What happens if I miss a deadline?

Missing Companies House filing deadlines triggers automatic penalties starting at £150 and escalating for each month of delay. Missing Corporation Tax payment deadlines results in interest charges and late payment penalties. Missing HMRC filing deadlines incurs penalties starting at £100. Set reminders and file early whenever possible.

Do I need to register for VAT immediately?

You must register for VAT if your taxable turnover exceeds £90,000 in any rolling 12-month period. Many businesses choose to register voluntarily before reaching this threshold to reclaim VAT on purchases and appear more established to B2B customers. Monitor your rolling turnover monthly.

MTD for Landlords 101: A Beginner’s Guide to Mastering Property Accounting

by Ariful | Mar 17, 2026 | UK Accounting

Understanding the MTD Timeline: When Do You Need to Act?

Compliance is not a choice; it is a requirement with strict deadlines. HMRC has phased the rollout of MTD for ITSA to allow landlords time to prepare. It is essential to know exactly where you stand based on your annual rental income.

• April 2026: If your total business or property income exceeds £50,000 annually, you must be compliant with MTD for ITSA by this date.
• April 2027: If your income is between £30,000 and £50,000, your deadline follows a year later.

Don’t wait until the final month to scramble for a solution. Establishing digital habits now will save you from the stress of last-minute filing and the risk of non-compliance penalties.

The Three Pillars of MTD Compliance

Mastering property accounting under MTD rules boils down to three core requirements. Understanding these will help you visualize your new workflow.

1. Digital Record Keeping

Under the new rules, you are required to keep a digital record of all your income and expenses. This doesn’t mean just scanning a PDF of an invoice. It means using “functional compatible software” that can record every transaction digitally. This creates a clear, unalterable audit trail that HMRC can verify if necessary.

2. Quarterly Updates

Instead of one big tax return at the end of the year, you will now provide HMRC with a summary of your income and expenses every three months. This provides a more real-time view of your tax liability. Quarterly updates are due within one month of the end of every quarter:

• Quarter 1: 6 April to 5 July (Deadline: 5 August)
• Quarter 2: 6 July to 5 October (Deadline: 5 November)
• Quarter 3: 6 October to 5 January (Deadline: 5 February)
• Quarter 4: 6 January to 5 April (Deadline: 5 May)

3. Final Declaration and End of Period Statement (EOPS)

After the fourth quarterly update, you will submit a final declaration. This is where you finalize your business income and claim any reliefs or adjustments (such as the mortgage interest tax credit) before confirming your final tax bill for the year.

Digitize Your Paper Trail: The Death of the Spreadsheet

For years, many landlords relied on complex Excel spreadsheets. While spreadsheets can still play a role, they must be “bridged” to HMRC via software to be MTD-compliant. However, the most efficient way to manage your property accounting is to move away from manual entry entirely.

By using a dedicated digital system, you can link your business bank accounts directly to your accounting platform. Every time a tenant pays rent or you pay a contractor for repairs, the transaction is automatically captured. This reduces human error and ensures you never miss a deductible expense.

Common deductible expenses you should track digitally include:

• Mortgage interest (applied as a tax credit)
• Property repairs and maintenance
• Landlord insurance premiums
• Professional fees (accounting, legal, and management)
• Utility bills (if not paid by the tenant)
• Cleaning and gardening services

Navigating Jointly Owned Properties

Many landlords own properties with a spouse, partner, or business associate. MTD rules apply to each individual’s share of the income. If your share of the gross rental income exceeds the £50,000 threshold (or £30,000 in 2027), you must register for MTD individually.

This is a common point of confusion. For example, if a property generates £80,000 in rent and is owned 50/50 by two people, each person has a qualifying income of £40,000. Under the current 2026 rules, they would not be required to join MTD until April 2027. However, if the income was £120,000, both would need to comply by April 2026.

Why Real-Time Accounting is a Game Changer

While the transition to MTD requires an initial investment of time and resources, the benefits for your property business are significant.

• Better Cash Flow Management: By updating your records quarterly, you always know exactly how much tax you owe. There are no more nasty surprises in January when a massive tax bill arrives that you haven’t budgeted for.
• Reduced Errors: Automation minimizes the risk of transposing numbers or forgetting to claim an expense. Every pound saved in legitimate deductions is a pound back in your pocket.
• Easier Financing: If you plan to expand your portfolio, having up-to-date, digital financial records makes it much easier to provide lenders with the data they need for mortgage approvals.

Checklist: Preparing Your Property Business for MTD

To help you get started, here is a simple checklist to ensure you are ready for the 2026 deadline.

1. Calculate Your Total Income: Review your total gross income from all business and property sources for the last tax year.
2. Separate Your Finances: If you haven’t already, open a dedicated bank account for your rental income and expenses. This is the single most important step for clean digital records.
3. Choose Your Software: Select an HMRC-compatible software or partner with a compliance suite.
4. Digitize Past Records: Start uploading receipts and invoices now to get into the habit before the mandatory deadline.
5. Talk to an Expert: Ensure your setup is correct to avoid penalties. An expert can help you see how to handle the heavy lifting for you.

Simplifying Your Compliance

At Sterlinx Global, we provide a complete Global Tax Compliance Suite. We understand that as a landlord or property manager, your time is best spent finding new investment opportunities or managing tenant relationships, not wrestling with quarterly tax updates.

Our operating model is simple and effective. You provide us with your raw financial data: bank statements, invoices, and rent rolls: and we take care of the rest. We handle:

• Ongoing Bookkeeping: Keeping your digital records up to date in real-time.
• Tax Calculations: Ensuring every deduction is applied correctly.
• MTD Filings: Submitting your quarterly updates and final declarations directly to HMRC.
• Year-End Accounts: Finalizing your position so you stay fully compliant with UK law.

Whether you are a UK resident landlord or an international investor with a UK property portfolio, our team is equipped to manage your end-to-end compliance.