The SA105 property income form is where UK landlords report their rental income and expenses to HMRC. For the 2025/26 tax year, understanding how to complete the SA105 2026 property income pages correctly is essential for compliance and minimising your tax liability.

This comprehensive guide walks through each section of the SA105 form, explaining what information you need and how to avoid common mistakes that could trigger HMRC enquiries.

What Is the SA105 Property Income Form?

The SA105 comprises the property income pages of your self-assessment tax return. It's where you report rental income from UK residential and commercial properties, along with allowable expenses and deductions.

For 2026, the SA105 guide landlord requirements remain similar to previous years, but you need to be aware of key changes:

  • Section 24 mortgage interest restriction remains fully in place
  • Furnished Holiday Lettings regime abolished from April 2025
  • Making Tax Digital for Income Tax becomes mandatory for landlords with gross property income over £10,000
  • From April 2027, separate property income tax rates will apply (22% basic, 42% higher, 47% additional)

When Do You Need to Complete SA105 Property Income Pages?

You must complete the SA105 if you receive rental income from UK property, regardless of the amount. This includes:

  • Buy-to-let rental income
  • Income from lodgers (above the rent-a-room allowance)
  • Commercial property rental income
  • Holiday letting income (post-FHL abolition)
  • Income from property you own jointly with others

Even if your property made a loss, you still need to complete the SA105 to claim relief against other income or carry the loss forward.

SA105 Property Pages Tax Return 2026: Section-by-Section Guide

Section 1: Property Income

This section captures your gross rental income before any deductions. Include all income received in the 2025/26 tax year (6 April 2025 to 5 April 2026):

  • Rent received: Monthly rent payments, including any paid in advance
  • Premiums: Any lease premiums or key money received
  • Other property income: Parking fees, storage charges, or cleaning deposits retained

For example, if you own a BTL property generating £1,200 monthly rent, your annual income would be £14,400. Include any December rent received early in March within the tax year.

Section 2: Property Expenses

List your allowable expenses in the relevant boxes. Common categories include:

  • Letting agent fees: Management fees, tenant find fees, advertising costs
  • Legal and professional costs: Accountancy fees, legal fees for tenancy agreements
  • Property maintenance: Repairs, decorating, cleaning between tenancies
  • Insurance: Buildings and contents insurance, landlord liability cover
  • Other expenses: Safety certificates, council tax (when vacant), ground rent

Remember that improvements (capital expenditure) cannot be claimed as expenses. A new kitchen is typically an improvement, while fixing a broken boiler is maintenance.

Section 3: Mortgage Interest and Finance Costs

Due to Section 24 restrictions, mortgage interest is no longer deductible as an expense. Instead, you receive a basic rate tax credit (currently 20%) on qualifying finance costs.

Enter your total mortgage interest and loan interest in the designated box. HMRC will calculate your tax credit automatically. For a landlord paying £8,000 annual mortgage interest, the tax credit would be £1,600 (20% of £8,000).

Section 4: Capital Allowances

For furnished lettings, you can claim capital allowances on furniture, appliances, and equipment. The Annual Investment Allowance (AIA) allows you to claim 100% relief on qualifying expenditure up to £1 million per year.

Items eligible for capital allowances include:

  • Furniture and furnishings
  • Kitchen appliances (washing machine, fridge, oven)
  • Carpets and curtains
  • Garden equipment (lawnmowers, tools)

Note that fixtures integral to the building (fitted kitchens, bathroom suites) typically don't qualify for residential property capital allowances.

Section 5: Losses

If your property expenses exceed your rental income, you have a property loss. You can either:

  • Carry the loss forward to offset against future property profits
  • Offset against other income in the same tax year (with restrictions)

Property losses cannot be offset against employment income or other non-property income, except in specific circumstances like the first four years of trading.

Common SA105 Completion Mistakes to Avoid

Mixing Personal and Rental Expenses

Only claim expenses wholly and exclusively for rental purposes. If you live in part of a property you let, apportion expenses appropriately. For a house where you occupy 25% and let 75%, only claim 75% of mortgage interest and maintenance costs.

Claiming Capital Improvements as Revenue Expenses

Distinguish between repairs (allowable) and improvements (not allowable). Repairing a broken window is an allowable expense; installing double glazing where single glazing existed is typically an improvement.

Incorrect Treatment of Mortgage Interest

Don't deduct mortgage interest as an expense if you're affected by Section 24. Enter it in the finance costs section to claim the 20% tax credit instead.

Missing the Rent-a-Room Relief

If you let a room in your main home, you may qualify for rent-a-room relief, allowing you to receive up to £7,500 tax-free annually. You can choose between this relief and claiming actual expenses.

SA105 and Making Tax Digital Requirements

From 6 April 2026, landlords with gross property income over £10,000 must use Making Tax Digital for Income Tax. This affects how you prepare your SA105:

  • Keep digital records throughout the tax year
  • Submit quarterly updates to HMRC
  • Use MTD-compatible software
  • Submit final SA105 through digital channels

The SA105 2026 property income requirements will integrate with your quarterly MTD submissions, reducing the year-end compliance burden.

Property Types and SA105 Considerations

Buy-to-Let Properties

Standard residential BTL properties follow the main SA105 structure. Remember that from April 2027, property income will be taxed at separate rates (22% basic, 42% higher, 47% additional), not general income tax rates.

Commercial Property

Commercial properties aren't affected by Section 24 restrictions. You can still deduct mortgage interest as an expense and may be able to claim capital allowances on fixtures and fittings.

HMOs and Multi-Unit Properties

For HMOs, you can claim room-by-room expenses where appropriate. Communal area costs are deductible, and you may face business rates rather than council tax depending on the property configuration.

Holiday Lettings (Post-FHL)

Following the abolition of Furnished Holiday Lettings relief from April 2025, holiday lets are treated as standard property income. However, if your letting activities constitute a trade, you might complete different tax return pages.

Professional Help with SA105 Property Income Forms

Given the complexity of property taxation and recent changes, many landlords benefit from professional support. A specialist property accountant can:

  • Ensure accurate SA105 completion
  • Maximise allowable deductions
  • Handle Section 24 calculations correctly
  • Prepare for MTD compliance
  • Advise on tax-efficient structures

The cost of professional help often pays for itself through tax savings and reduced compliance risks.

SA105 Deadlines and Penalties

For the 2025/26 tax year SA105:

  • Paper return deadline: 31 October 2026
  • Online return deadline: 31 January 2027
  • Tax payment deadline: 31 January 2027

Late filing penalties start at £100, with additional penalties for extended delays. If you owe tax, late payment interest applies from 1 February 2027.

Key Changes for Future SA105 Returns

Looking ahead to 2027 and beyond, landlords should prepare for:

  • Separate property income tax rates from April 2027
  • Full MTD integration for eligible landlords
  • Potential further changes to property tax reliefs
  • Enhanced digital record-keeping requirements

Consider whether incorporation into a limited company might be beneficial given the changing tax landscape.

Getting SA105 Right

Completing your SA105 property income form accurately is crucial for compliance and tax efficiency. With Section 24 restrictions, MTD requirements, and future tax rate changes, the property tax landscape continues to evolve.

Take time to understand each section, keep detailed records throughout the year, and consider professional advice for complex situations. The investment in getting your SA105 right pays dividends in reduced tax liabilities and peace of mind.

Whether you're a first-time landlord or managing a large portfolio, accurate SA105 completion remains fundamental to successful property investment in the UK.