Birmingham's 7.2% yield claim hides a £159 monthly loss

Six years of Section 24 have already thinned your Yorkshire margins, and every EPC deadline since has taken another slice off what's left. So when the West Midlands gets marketed as the region to redeploy into, with yields quoted "to 7.2%", you don't take the number at face value, you check it. Good instinct. The West Midlands is genuinely England's second-fastest growing region this year, and Birmingham is the obvious first stop for anyone expanding a portfolio there. Run the actual numbers on an average purchase, though, and the picture is far tighter than the marketing suggests.

At Birmingham's real average price and rent, that 7.2% becomes 5.61% gross and 4.06% net, before Section 24 has even been applied. Add the tax, and a higher-rate taxpayer buying at the city average ends up roughly £159 a month worse off than break-even, on a purchase that was barely covering its own mortgage interest to begin with.

The West Midlands is growing. Birmingham itself is not.

Average house prices across the West Midlands rose 2.9% in the year to May 2026, from £241,000 to £248,000 (HM Land Registry/ONS UK House Price Index, May 2026, published 22 July 2026). That's a genuinely strong regional number, well ahead of the roughly 1.8% national annual change reported by Nationwide for July 2026. But Birmingham, the region's largest city and the name most portfolios search for first, didn't share in that growth: the average house price in the city was £233,000 in May 2026, "in line with" the £233,000 recorded a year earlier, a change of just 0.3% (ONS, May 2026). The regional growth story is real. It's being driven by towns and boroughs around Birmingham, not by the city itself.

Splitting the West Midlands numbers further, the average price for a mortgaged purchase in the region was £249,000 in May 2026, up from £242,000 (ONS, May 2026), while in Birmingham specifically it was £237,000, "similar to" £238,000 a year earlier. First-time buyers in Birmingham paid an average of £211,000, and home-movers paid £275,000 (ONS, May 2026). Property type matters too: Birmingham's average flat price fell 3.5% over the year to £145,000, while terraced houses held at £220,000 and detached homes averaged £439,000 (ONS, May 2026).

So if you're being pitched "the West Midlands" as a growth story, ask whether that growth is actually happening in the specific city or postcode you're being shown, because on the headline number, Birmingham itself is flat.

Birmingham's marketed 7.2% yield, checked against reality

Property investment portals currently market Birmingham buy-to-let yields of up to 7.2% (PropertyInvestmentsUK, 2026), and specific postcodes genuinely do reach that range: the Jewellery Quarter (B18) has been quoted at 6.5-7.6% across several 2026 sources, driven by strong demand from young professionals wanting walkable city-centre living. That's not the number a landlord buying at the city's actual average price and rent will see.

Birmingham's average private rent was £1,090 a month in June 2026, up 3.0% on the year from £1,059 (ONS Price Index of Private Rents, June 2026). Set that against the city's average sold price of £233,000 (ONS UK House Price Index, May 2026) and the real gross yield is 5.61%, well below the marketed headline. This is the same claim-versus-reality gap already logged in Manchester's marketed 9% yield, which calculated to an actual 6.6% once checked against the city average, and in the Nottingham spotlight earlier this month, where a marketed 9.2% calculated to just 4.67%.

So treat any Birmingham postcode yield you're shown as a claim to verify, not a number to trust, the same discipline that already applied to Manchester and Nottingham.

The cash flow at 75% LTV, before tax

Buy at Birmingham's average price of £233,000 with a 75% loan-to-value buy-to-let mortgage and you're putting down a £58,250 deposit against a £174,750 loan. At the current average buy-to-let fixed rate of 5.42% (Moneyfacts, 1 July 2026), that's £789 a month in interest on an interest-only basis, the standard structure for most buy-to-let lending.

Against £1,090 a month in rent, strip out a 12% management fee (£131), a maintenance reserve of 5% of rent (£55), landlord buildings insurance of £312 a year (£26 a month, ABI Premium Tracker, early 2026) and a one-month annual void allowance (£91), and you're left with £788 a month in net operating income before the mortgage is paid. Set that against the £789 monthly interest bill and the property is, to the nearest pound, exactly break-even before any tax is due.

So this isn't a purchase with room to absorb a rate rise, a void month, or an unexpected repair bill: it starts at break-even and every extra cost comes straight off the bottom line.

Section 24: what it costs at each tax band

Because mortgage interest can no longer be deducted as a business expense, a landlord pays income tax on the full rental profit before interest relief and claims only a 20% credit against the interest paid, capped at that profit figure whenever interest exceeds it. On this purchase, annual mortgage interest of £9,471 is marginally larger than the £9,454 profit before interest relief, so the credit is capped at 20% of £9,454, which is £1,891 a year, or £157 a month.

For a basic-rate (20%) taxpayer, tax due on the £9,454 profit is also £1,891, exactly matching the capped credit, so no further cash leaves the account and the loss stays at roughly break-even. For a higher-rate (40%) taxpayer, tax due is £3,782, leaving £1,891 after the credit, roughly £157 a month, which takes the total loss to £159 a month, or around £1,908 a year.

So being a basic-rate taxpayer doesn't turn this into a winning purchase, it just stops Section 24 from tipping an already marginal deal into a loss; a higher-rate taxpayer doesn't have that protection.

Stamp duty adds another £13,810 before you have collected a penny in rent

The West Midlands sits entirely in England, so Stamp Duty Land Tax applies, not Scotland's Land and Buildings Transaction Tax or Wales's Land Transaction Tax. Additional residential properties, including every mortgaged buy-to-let purchase, carry a 5% surcharge on top of the standard bands, raised from 3% on 31 October 2024 at the Autumn Budget. On a £233,000 purchase, that means 5% on the first £125,000 and 7% on the remaining £108,000, a total bill of £13,810.

Set that against the monthly cash flow figures above and the stamp duty bill is worth roughly seven years of the higher-rate shortfall, paid upfront before the first month's rent has landed, on a property that was already close to break-even. Run your own numbers through our stamp duty calculator and our Section 24 tax calculator before making an offer.

So on a deal this tight, treat the upfront stamp duty bill as years of the eventual monthly shortfall paid in one go, not a rounding error, because that changes how quickly this purchase can realistically pay you back.

What this means for you

The West Midlands' 2.9% regional growth is real, but it's not Birmingham's story on the numbers above, and the maths points toward treating the city average as a marginal, tax-sensitive purchase rather than the income play the marketing implies. If you're pursuing this city, target a verified outperforming postcode such as the Jewellery Quarter, where 6.5-7.6% yields are backed by more than one source, or buy meaningfully below the £233,000 average with rent confirmed against comparable local lets, not an agent's projection. Frankly, if you're a higher-rate taxpayer, a purchase that can't clear the roughly break-even pre-tax position calculated here by a reasonable margin isn't worth the £13,810 stamp duty bill, because Section 24 will turn a thin surplus into a loss, not the other way round. Much of Birmingham's cheaper stock is older terraced and flatted housing, the kind most likely to need EPC upgrades before the 1 October 2030 deadline, with costs capped at £10,000 per property and fines of up to £30,000 for non-compliance (Warm Homes Plan, GOV.UK, published 21 January 2026, subject to final legislation), so check the current rating before you factor a property into your numbers, not after you've exchanged. Most landlords who run this specific calculation end up looking at the surrounding boroughs actually driving the region's 2.9% growth, or at a named outperforming postcode, rather than the Birmingham city average.