One of the most frustrating aspects of Section 24 is how it can push landlords into higher tax brackets without increasing their actual income. This phenomenon, known as "phantom income," occurs because Section 24 restricts mortgage interest relief while requiring you to pay tax on rental income you may never actually receive.

Understanding whether Section 24 can push you into higher rate tax is crucial for portfolio planning, especially with property income tax rates changing to 22%/42%/47% from April 2027. Let's examine exactly how this mechanism works and what you can do about it.

How Section 24 Creates Phantom Income

Before Section 24, landlords could deduct mortgage interest as a business expense, reducing their taxable rental income. Now, mortgage interest is restricted to a basic rate (20%) tax credit, meaning you pay tax on income that goes straight to the mortgage lender.

Here's a practical example showing how this creates phantom income:

  • Rental income: £30,000
  • Mortgage interest: £25,000
  • Other expenses: £3,000
  • Net cash flow: £2,000

Under the old system, taxable profit would be £2,000. Under Section 24, your taxable rental income becomes £27,000 (£30,000 minus £3,000 other expenses), with a £5,000 tax credit (20% of £25,000 mortgage interest).

This means you're paying tax on £27,000 of income when your actual cash flow is only £2,000 - creating £25,000 of phantom income that exists purely for tax purposes.

Tax Rate Thresholds and Section 24 Impact

Section 24's phantom income effect becomes particularly problematic when it pushes you over tax rate thresholds. The current income tax bands for 2026/27 are:

  • Personal allowance: £0 - £12,570
  • Basic rate (20%): £12,571 - £50,270
  • Higher rate (40%): £50,271 - £125,140
  • Additional rate (45%): £125,140+

From April 2027, property income will be taxed at separate rates: 22% basic, 42% higher, and 47% additional rate. This makes the threshold crossing effect even more significant.

Real Example: Employment Income Plus Property

Consider Sarah, who earns £35,000 from employment and has a rental property generating £20,000 annual rent with £18,000 mortgage interest:

  • Employment income: £35,000
  • Phantom rental income (Section 24): £20,000
  • Total taxable income: £55,000

Despite having minimal actual rental profit, Sarah is pushed into the higher rate tax band on £4,730 of her income (£55,000 - £50,270). This costs her an additional £946 in tax (£4,730 × 20% difference between basic and higher rates).

The Section 24 tax relief complete guide explains these calculations in more detail.

Tax on Income You Don't Receive

The concept of paying tax on income you don't receive is particularly harsh when properties are highly leveraged. Many landlords find themselves in cash-flow negative positions while still owing significant tax bills.

This situation is especially common with:

  • High loan-to-value mortgages: Where interest payments exceed 80% of rental income
  • Interest-only mortgages: Where no capital is being repaid
  • Portfolio landlords: With multiple leveraged properties creating cumulative phantom income
  • Recent purchasers: Who bought when interest rates were lower but now face higher payments

The Cash Flow Trap

Many landlords discover they owe more in tax than their properties actually generate in cash. This creates a dangerous cycle where landlords must use personal funds or other property income to pay tax bills, potentially forcing property sales or portfolio restructuring.

For example, a landlord with 5 BTL properties each generating £15,000 phantom income could face tax on an additional £75,000 of income while receiving minimal actual cash flow. If this pushes them into higher rate tax, the additional cost could exceed their entire rental profit.

Personal Allowance Reduction

Section 24's phantom income can also trigger personal allowance reduction. Once your total income exceeds £100,000, you lose £1 of personal allowance for every £2 of income above this threshold, creating an effective 60% tax rate on income between £100,000 and £125,140.

This means Section 24 can push landlords not just into higher rate tax, but into the personal allowance reduction zone, creating an even more punitive effective tax rate on income they may never actually receive.

Strategies to Mitigate Section 24 Impact

While Section 24 cannot be avoided entirely, several strategies can help reduce its impact on your tax position:

Portfolio Restructuring

  • Reduce borrowing: Pay down mortgages to reduce interest payments and phantom income
  • Sell underperforming properties: Focus on properties with better rent-to-mortgage ratios
  • Increase rents: Where market conditions and tenancy agreements allow

Incorporation Consideration

Moving properties into a limited company can avoid Section 24 entirely, as companies can still deduct mortgage interest as a business expense. However, incorporation involves significant costs and complexity.

The buy-to-let limited company guide covers this option comprehensively, including the tax implications of transferring existing properties.

Income Smoothing

  • Timing of rental increases: Spread increases across tax years
  • Capital expenditure timing: Accelerate allowable expenses into high-income years
  • Pension contributions: Use carry-forward rules to reduce taxable income

Planning for April 2027 Changes

The introduction of separate property income tax rates from April 2027 adds another layer of complexity. Property income will be taxed at 22%/42%/47% rather than the general income tax rates, making the threshold effects even more pronounced.

Landlords should start planning now for these changes, particularly if Section 24 is already pushing them close to threshold boundaries. The phantom income effect will become more expensive when higher rate property income is taxed at 42% rather than 40%.

Consider reviewing your property investment tax position well before these changes take effect.

Professional Planning Importance

Section 24's interaction with tax thresholds creates complex scenarios that require careful planning. Many landlords underestimate the phantom income effect until they receive unexpected tax bills.

Professional advice becomes particularly important when:

  • Your total income approaches threshold boundaries
  • You're considering portfolio expansion
  • You have significant mortgage interest payments
  • You're planning major life changes affecting your income

A specialist property accountant can model different scenarios and help you understand the true tax cost of your investment strategy. Our property tax services include Section 24 impact analysis and planning strategies.

Record Keeping for Section 24

Accurate record keeping becomes crucial when Section 24 affects your tax position. You'll need to track:

  • All rental income received
  • Mortgage interest payments (separately from capital repayments)
  • Other allowable expenses
  • Total tax liability across all income sources

With Making Tax Digital becoming mandatory for landlords from April 2026, digital record keeping will be essential for managing Section 24 calculations and reporting requirements.

Summary: Managing Section 24's Tax Rate Impact

Section 24 can indeed push landlords into higher tax rates through phantom income, creating tax liabilities on income never actually received. This effect is particularly harsh when it triggers threshold crossings, personal allowance reduction, or the upcoming separate property tax rates from April 2027.

The key to managing this impact is understanding your total tax position across all income sources and planning accordingly. Whether through portfolio restructuring, incorporation, or other strategies, addressing Section 24's phantom income effect should be a priority for any landlord approaching tax threshold boundaries.

Given the complexity of these interactions and the significant financial implications, seeking specialist advice is often the most cost-effective approach to managing Section 24's impact on your tax position.