Now Self Assessment Is Done… How Much Did Landlords Actually Make?

For most landlords, January ends the same way every year.

You submit the return.

You breathe out.

You see the number.

And then quietly you ask yourself:

“Is that really what all that hassle added up to?”

From the outside, property still looks like a solid game. Rent landing monthly. Assets growing in the background. But self assessment has a habit of cutting through the story we tell ourselves and replacing it with something far less emotional. Facts.

And from both an accountancy and letting agency perspective, those facts are revealing.

Rent looks healthy. Profit tells a different story.

One of the biggest misconceptions we see is this: If the rent is coming in, the property must be doing well. In reality, rent is just the headline figure.

Across the UK, average gross rental yields often sit around 5–6%. On paper, that looks respectable. But once you factor in mortgage interest, compliance, repairs, management, voids, and tax, net returns frequently fall closer to 2–3%.

That gap is where most of the surprise comes from.

Self assessment doesn’t care what the rent felt like month to month. It forces landlords to look at what actually remained once everything else had taken its share.

Where margins quietly disappear

Looking across returns this year, the same pressure points keep appearing.

1. Mortgage costs

Many landlords are still adjusting to interest costs that are 30 - 50% higher than they were just a few years ago. In many cases, rent hasn’t moved at the same pace.

2. Compliance and regulation

Compliance is no longer an occasional cost, it’s a fixed one. Gas safety, EICRs, EPCs, licensing, insurance, and safety works regularly total £500–£1,500 per property per year, before any repairs are even considered.

3. Repairs cost more than they used to

Since 2022, contractor and materials costs have increased by around 20 - 30%. One boiler, one electrical issue, one roof repair and a year’s profit can vanish in a single invoice.

4. Voids and inefficiency

One empty month doesn’t feel dramatic until you realise it’s roughly 8 - 9% of your annual rent gone. Two months materially change the year’s performance. Pricing, turnaround time, and tenant selection matter far more than most landlords realise.

Are landlords pushing rents enough?

This is where the numbers get uncomfortable.

Manchester rents have increased by roughly 7 - 10% year on year in many areas, driven by strong demand and limited supply. Yet many landlords are still charging rent based on what feels “fair” or what they charged several years ago.

From a letting agent’s perspective, correctly priced properties:

• Let faster

• Attract stronger tenants

• Reduce arrears risk

• Experience fewer voids

  
  

From an accountant’s perspective, failing to review rent while costs rise guarantees one thing... shrinking margins.

Avoiding rent increases doesn’t protect an investment it slowly weakens it.

There’s a difference between fair pricing and underpricing, and January is usually when that difference becomes visible.

“Doing fine” vs actually being profitable

Another phrase we hear a lot after self assessment is: "We’re doing fine.”

Rent covers the bills. Nothing’s gone wrong. The property hasn’t caused stress.

But profitability isn’t about whether things are okay, it’s about whether they’re resilient.

If a property only works when:

• Nothing breaks

• Tenants always pay on time

• Interest rates behave

• Tax doesn’t surprise you

then the margin is fragile.

From an accounting view, sustainable investments show consistent surplus after tax and costs. From a letting view, profitable properties are the ones that can absorb issues without panic decisions.

Management isn’t just maintenance

This is where the distinction matters most.

Maintenance keeps a property compliant. Management protects profitability.

Effective management includes:

• Regular rent reviews aligned to the market

• Minimising void periods

• Proactive maintenance planning

• Cost control on repairs

• Selecting the right tenants

• Understanding cash flow and tax exposure

  
  

Poor management can quietly cost landlords one to two months’ rent per year through inefficiency alone. Strong management can improve net returns by 5 - 10% without adding risk or buying more property.

A positive outlook with clearer expectations

Despite tighter margins, property remains a strong long term investment:

• Consistent tenant demand in regional cities

• Inflation linked income

• Long term capital growth

• Leverage opportunities few other assets offer

But the landscape has changed.

Success today isn’t about passive ownership. It’s about understanding the numbers and adjusting early, not reacting late.

The landlords who perform best aren’t the ones with the most properties. They’re the ones who review, question and adapt.

Self assessment isn’t just a tax obligation. It’s a mirror.

At The Gilbert Group, we see both sides, the rent coming in and what actually stays. That combined view is what allows landlords to move from “doing fine” to investing with confidence.

January brings clarity every year.

What you do with it determines whether the next one feels better or exactly the same.