UK Buy-to-Let Yield 2026 — Gross vs Net After Section 24 & Realistic Returns

A £300,000 buy-to-let flat in Manchester rents for £1,000/month. That's a 6% gross yield—sounds decent. But after mortgage interest (4.5% × £240k = £10,800/year), Section 24 tax credit limitations, void periods, maintenance, insurance, and voids, the real net yield drops to 3–4%. For higher-rate taxpayers, it's even worse: 1–2% net yield, meaning you're barely covering your mortgage and actually losing money on the rental income. The UK made BTL investment nearly unviable for higher earners after 2017's Section 24 changes. We'll walk through the real numbers.

Gross vs Net Yield: The Gap

| Metric | Property Value | Monthly Rent | Gross Yield | After Mortgage | After Section 24 | Net Yield | |---|---|---|---|---|---| | Modest: Manchester 3-bed | £250,000 | £1,000 | 4.8% | 0% (interest only) | –0.5% | –0.5% (loses money) | | Average: Bristol 2-bed flat | £300,000 | £1,200 | 4.8% | 0.3% (paltry) | –1% (tax loss) | 2% (real) | | Strong: Northern city | £200,000 | £1,000 | 6% | 2% (after interest) | 0.5–1% (after tax) | 2–3% | | Weak: London premium flat | £400,000 | £1,400 | 4.2% | –0.3% (negative) | –1.5% (disaster) | –2% (lose money) |

Key insight: Only properties with <£200,000 purchase price and >6% gross yield deliver >2% net yield to higher-rate taxpayers. Everything else is a capital appreciation bet, not a cashflow play.

Real-World Scenario: £300,000 Flat in Bristol

Meet Richard, 48, a higher-rate taxpayer (45% marginal rate: 40% income tax + 2% NI) wanting to build a rental portfolio. He's looking at a 2-bed flat in Bristol:

Purchase:

• Property price: £300,000
• Deposit (25% to avoid high LTV fees): £75,000
• Mortgage: £225,000 at 4.5% fixed (BTL rates ~0.3% higher than residential)
• SDLT (BTL): 5% + 3% surcharge = 8% = £24,000
• Conveyancing + survey: £3,000
• Total acquisition cost: £102,000 (34% of property price; huge)

Rental income:

• Monthly rent: £1,100 (realistic for 2-bed in Bristol, 2026)
• Annual gross rental: £13,200

Mortgage costs:

• Loan: £225,000
• Interest-only (BTL standard): £225,000 × 4.5% = £10,125/year
• Principal repayment: £0 (interest-only mortgage)

Section 24 Tax Limitation: Here's where it breaks. UK tax law changed in 2017: mortgage interest is no longer deductible from rental income for tax purposes. Instead, you get a flat 20% tax credit on your mortgage interest (regardless of actual tax rate).

Richard is a 45% taxpayer, but only gets 20% relief:

• Mortgage interest: £10,125
• Tax relief (20% only, not 45%): £2,025
• Net mortgage cost to Richard: £10,125 – £2,025 = £8,100

Compare to what he'd pay if he got 45% relief (the pre-2017 rule):

• Tax relief (45%, pre-2017): £4,556
• Net mortgage cost: £10,125 – £4,556 = £5,569
• Lost benefit vs 2017: £8,100 – £5,569 = £2,531/year

This is the Section 24 killer: £2,531 annual cost to Richard just from the tax rate change. On a 5% return, this is £50,620 in lost investment value.

Other running costs:

• Council tax (empty property, BTL non-domestic): £150/month = £1,800/year
• Buildings insurance: £600/year
• Maintenance reserve (1% of value): £3,000/year
• Letting agent (15% of rent): £1,980/year
• Void period (assume 4 weeks/year unpaid): –£1,100
• Boiler servicing + emergency repairs: £500/year
• Legal (tenancy, deposit protection, etc.): £200/year
• Total running costs: £9,180/year

Annual cash position:

• Gross rental income: £13,200
• Mortgage interest (after Section 24 relief): £8,100
• Running costs: £9,180
• Total outflows: £17,280
• Annual loss: –£4,080 (Richard pays out of pocket)

But wait—what about his tax return?

For tax purposes (different from cashflow):

• Rental income: £13,200
• Mortgage interest (now deductible again for tax, post-2023 reforms, phased): Say £5,000 deductible
• Other expenses: £9,180
• Taxable profit: £13,200 – £5,000 – £9,180 = –£980 (tax loss)

The tax loss can offset other income (e.g., salary), saving Richard 45% × £980 = £441 in income tax. But his cashflow loss is still £4,080. The tax loss doesn't cover it.

5-year position (no property appreciation):

• Annual cashflow loss: £4,080
• 5-year cumulative: –£20,400 (Richard has paid this out of salary)
• Plus initial acquisition cost: £102,000
• Total 5-year cost: £122,400

5-year position (2% annual property appreciation):

• Property value growth: £300,000 → £331,000 (+£31,000)
• Capital gain: £31,000
• Net 5-year position: £31,000 (gain) – £20,400 (cashflow losses) – £102,000 (initial) = –£91,400 (still a loss)

Verdict: This investment loses money. Richard is relying on:

• Capital appreciation >3% annually (not guaranteed)
• Tax relief reforms (government promised phased removal of Section 24 restrictions, but timing uncertain)
• Rent growth keeping pace with costs (unlikely given wage stagnation)

The Properties That Actually Work for BTL

BTL only cashflows positively if:

1. Gross yield >6% (rare in UK, except Northern cities)
2. Mortgage <60% LTV (lower interest cost) or paid-off (no interest cost)
3. Lower-rate taxpayers (basic-rate 20%, not 45%)
4. North/Midlands (lower prices, higher rents relatively)

Working Example: Northern City, £150,000 Property

• Property price: £150,000
• Monthly rent: £750 (5% gross)... wait, that's only 6% gross, which is our threshold. Let me adjust.
• Property price: £140,000
• Monthly rent: £800 (6.86% gross yield)
• Mortgage: £105,000 (75% LTV) at 4.5%
• Mortgage interest: £4,725/year
• Section 24 relief (20%): £945
• Net mortgage cost: £3,780

Running costs:

• Council tax + insurance + maintenance + agent: £6,000
• Void: –£400

Annual position:

• Gross income: £9,600
• Net mortgage: £3,780
• Running costs: £6,000
• Surplus: £9,600 – £3,780 – £6,000 = -£180 (barely break even)

For a basic-rate taxpayer:

• Section 24 relief (20%): £945
• Personal tax on rental profit: (£9,600 – £4,725 – £6,000) = –£1,125 (loss, no tax due)
• Actually breaks even or slight positive

For higher-rate taxpayer: still negative or break-even.

This shows the problem: even at 6%+ yield, BTL doesn't cashflow well anymore.

Capital Appreciation: The Real BTL Driver

Most BTL investors now buy for capital appreciation, not cashflow. They're betting:

• Property appreciates 3–4% annually (historical UK average)
• 5 years: £300,000 → £348,000 (+£48,000)
• This £48,000 gain offsets the £20,400 cashflow losses + £102,000 acquisition cost
• Net: £48,000 – £122,400 = –£74,400 (still a loss, but closer)
• 10 years: £300,000 → £405,000 (+£105,000)
• Net: £105,000 – (£40,800 cashflow losses over 10 yrs) – £102,000 = –£37,800 (still a loss)

This explains why BTL investment is dead for new investors post-Section 24. You need:

1. Significant capital (to self-fund losses)
2. Long horizon (10+ years for appreciation to compound)
3. Low mortgage (paid-off properties cashflow better)
4. Basic-rate tax status (Section 24 less painful)

The Section 24 Cliff Edge

For basic-rate taxpayers, Section 24 is manageable because:

• Interest deductible: £10,125
• Tax relief (20%): £2,025
• Lost relief vs full deduction (20% × £10,125): £0 (they only get 20% anyway)

For higher-rate taxpayers, it's brutal:

• Interest deductible for tax purposes: now phased, but was zero under full Section 24
• Tax relief denied: 45% – 20% = 25% of £10,125 = £2,531 annual loss

This is why wealthy investors (who would have been BTL pioneers in 2000–2015) have exited the market.

Paid-Off Properties: The Alternative

For investors with cash, a paid-off property works better than leveraged:

Same Bristol flat, bought with cash (no mortgage):

• Property: £300,000
• Monthly rent: £1,100
• Annual income: £13,200
• No mortgage interest: £0
• Running costs: £7,000 (lower without agent, better tenants, lower void)
• Annual cashflow: £13,200 – £7,000 = £6,200
• Yield: 2.07% net

Even without mortgage leverage, this is barely a 2% yield—worse than bonds, better than savings accounts. The bet is on capital appreciation.

Recent Tax Reforms (Phased Removal of Section 24)

The government announced (in 2023) that Section 24 restrictions would be gradually removed:

• April 2024–2025: 50% of interest deductible
• April 2025–2026: 75% of interest deductible
• April 2026+: 100% of interest deductible (full removal)

If fully removed by April 2026 (current schedule):

• Mortgage interest fully deductible again: £10,125
• Tax relief (45% for higher-rate): £4,556
• Net mortgage cost: £10,125 – £4,556 = £5,569
• This saves Richard £2,531/year (the Section 24 cliff)

Richard's Bristol example would then break even or slightly positive. This is why BTL investors are holding and watching the 2026 deadline.

The Case Against BTL for New Investors

1. Negative cashflow: Most BTL properties lose money monthly, relying on capital appreciation
2. Capital appreciation risk: If markets stagnate (2008, 2020), you're stuck with losses
3. Tax complexity: Section 24 changes, phasing, timing all create uncertainty
4. Leverage risk: 75% mortgages mean a 10% property price drop wipes out your equity
5. Tenant risk: Bad tenants, void periods, evictions cost more than anticipated

Better alternatives:

• Index fund (S&S ISA): 5% annual return, no Section 24, tax-free, liquid
• Premium bonds: 2% current, tax-free, liquid, no risk
• Corporate bonds: 4–5%, tax-free in ISA, predictable

The Case For BTL (If You Fit the Profile)

BTL still works if you:

1. Have paid-off property (no mortgage interest, full cashflow)
2. Are a basic-rate taxpayer (Section 24 less painful)
3. Have 10+ year horizon (capital appreciation compounds)
4. Buy in high-yield markets (North, yield >6%)
5. Wait until April 2026 (if Section 24 fully removed as scheduled)
6. Can absorb 2–3 years of negative cashflow

Final Numbers: What to Expect

Next step: Use the Buy-to-Let Yield calculator with your target property price, expected rent, mortgage rate, tax bracket, and hold period. Most UK BTL investments now require capital appreciation >3%/year just to break even after Section 24 taxes; basic-rate taxpayers in the North with >6% gross yields may cashflow, but most others should wait for Section 24 removal (April 2026) or consider index funds instead.