As the 5th of April 2026 slowly approaches, property developers and landlords across the UK start asking the same question:

“Have I done everything I should to keep HMRC happy and my tax bill under control?”

The good news is that a bit of tax planning before the financial year ends can make a meaningful difference. The not-so-good news is that property tax rules are fiddly, and they’ve changed a lot in recent years. Whether you’re developing property, running a buy-to-let portfolio, or doing a bit of both, here are a few accounting and tax must-dos before 5 April 2026.

Buy-to-let income and allowable expenses

Rental income must be declared in full, but allowable expenses can be deducted to reduce the taxable profit.

Typical allowable expenses include letting agent fees, repairs and maintenance, landlord insurance, service charges, accountancy fees, and replacement domestic items such as fridges or washing machines. The distinction between repairs and improvements is crucial. Repairs generally qualify for immediate tax relief, while improvements are usually treated as capital expenditure.

Before the 5 April 2026, review whether any necessary repairs can be completed and paid for in the current tax year. Timing alone can shift your tax position more than expected.

Record-keeping HMRC actually expects

HMRC expects clear, accurate records that support the figures on your tax return.

This includes invoices, receipts, loan statements, bank statements, and mileage logs where relevant. Good records are not just about surviving an inquiry. They also help you spot missed expenses and reduce stress when deadlines approach.

With Making Tax Digital for Income Tax becoming more relevant for landlords, having reliable systems in place now will save a lot of hassle later.

Mortgage interest tax relief realities

If you own rental property personally, mortgage interest is no longer deducted as an expense. Instead, you receive a basic rate tax credit.

For higher-rate and additional-rate taxpayers, this often means paying more tax despite a less than healthy-looking rental surplus (or even loss) on paper. Before the financial year ends, it’s worth checking whether your current structure still works for you and whether longer-term planning might be needed.

This is one of the most common areas where landlords are caught off guard.

Lodger income and Rent a Room relief

If you rent out a room in your own home, Rent a Room relief allows up to £7,500 per year to be earned tax-free, provided the conditions are met.

Once income exceeds that threshold, you must choose whether to use the relief or deduct actual expenses instead. That choice can significantly affect your tax bill.

Before 5 April, check your total lodger income and confirm that the method you are using is still the most tax-efficient option.

Property development and Capital Gains Tax

Property developers face different tax treatment from long-term investors. Depending on the nature of the activity, profits may be subject to Income Tax rather than Capital Gains Tax.

If you have sold property during the tax year, reporting deadlines can be much shorter than expected, and the way the transaction is structured matters. Intention, frequency, and level of activity all play a role.

Before year-end, it is essential to understand how any disposals will be taxed and whether any reliefs or allowances remain available.

VAT on building works and developments

VAT is one of the most misunderstood areas of property development.

New builds may qualify for zero-rating, certain conversions can attract reduced VAT, and standard-rated VAT often applies elsewhere. Errors in VAT treatment can quickly erode profit margins.

If you are mid-project or planning works around year-end, review how VAT is being applied, ensure invoices are correctly issued, and confirm whether VAT registration or reclaim opportunities apply.

What you should do before the 5th of April 2026

The end of the tax year can creep up quickly, especially if you are juggling tenants, developments, and day-to-day cash flow. The good news is that a bit of focused action before the 5th of April 2026 can make a real difference to your tax position and your stress levels.

Here’s a breakdown of our year-end tips for property developers and landlords in the UK:

1. Get your records in order

Before anything else, make sure your numbers are up to date. This means:

• Logging all rental income received to date
• Recording development costs accurately, including materials, labour, professional fees, and finance costs
• Making sure bank statements, invoices, and receipts are complete and accessible

Good records are not just about HMRC compliance. They give you clarity. When your figures are clean, planning becomes much easier and mistakes are far less likely.

2. Review allowable expenses carefully

Not everything you spend is treated the same for tax. Before the financial year ends, review what you have claimed and what you might be missing.

For landlords, this can include:

• Repairs and maintenance
• Letting agent and management fees
• Insurance, safety certificates, and professional costs

For developers, this may involve:

• Capital versus revenue expenditure
• Costs that should be added to the base cost of a property for future capital gains calculations

Claiming correctly matters. Overclaiming can trigger problems later, but underclaiming means paying more tax than necessary.

3. Check how finance costs and relief apply to you

Mortgage interest relief for landlords continues to be an area of confusion. The rules are different depending on whether you operate personally or through a company.

Before 5 April 2026, it is worth reviewing:

• Whether you are claiming finance costs in the correct way
• How the basic rate tax credit affects your personal tax bill
• Whether your current structure still makes sense going forward

This is often where small planning tweaks can lead to meaningful savings.

4. Consider capital gains and timing

If you have sold, or are planning to sell, a property or development, timing matters.

Before year end, look at:

• When disposals took place and which tax year they fall into
• Whether losses from other disposals can be used to offset gains
• How annual exemptions or reliefs might apply

In some cases, accelerating or delaying a transaction by a short period can change the tax outcome significantly.

5. Review VAT on building works and property use

VAT can be one of the trickiest areas for property developers.

Now is the time to:

• Check whether building works qualify for zero-rating or reduced rates
• Confirm VAT treatment on conversions versus new builds
• Review partial exemption issues if you have mixed taxable and exempt supplies

Mistakes around VAT are common, and they can be expensive. A pre-year-end review can help catch issues before they snowball.

6. Think ahead, not just back

Finally, do not treat the 5th of April 2026 as a finish line. Use it as a planning point.

Ask questions like:

• Is your current structure still tax-efficient?
• Are you planning acquisitions or developments in the new tax year?
• Do you need better systems for record-keeping and reporting?

A short conversation now can help set you up for a far smoother year ahead.

How Your Digital Accountant can help

We can support property developers and landlords across the UK with clear advice, year-end reviews, and practical tax planning. We help you stay compliant, avoid surprises, and make confident decisions about your property finances.

If you would like help preparing for 5 April 2026 or want a trusted partner to guide you through the numbers, please get in touch with us. We are here to make property accounting feel far less stressful and far more useful.

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