Buying Through a Limited Company: The Trade-offs Behind the Tax Headline

"Just buy it through a company" is the most repeated piece of advice in landlord circles, and the least often accompanied by the arithmetic.

It genuinely solves one significant problem. It also introduces costs and frictions that are usually skipped over, and for some landlords those outweigh the saving entirely.

This is the honest version of the trade-off. It is mainly a UK question, because it is largely driven by a UK tax change, though the structural points apply more widely.

The problem it solves

In the UK, individual landlords can no longer deduct mortgage interest from rental income - they receive a basic-rate credit instead. For a higher-rate taxpayer this is materially worse, and it can produce a taxable profit that exceeds the actual cash the property generated. See Mortgage Interest and Your Tax Bill.

Companies are not subject to that restriction. A company deducts mortgage interest as an ordinary business expense, then pays corporation tax on what is left.

That is the whole headline, and it is real. The question is what it costs to get it.

The costs nobody puts in the comparison

Worse mortgage terms

Fewer lenders offer limited company buy-to-let, rates are typically higher than personal equivalents, and arrangement fees are often larger. That gap eats into the tax saving every single month.

Most lenders will also require a personal guarantee from the directors - so the limited liability that people associate with a company is substantially reduced for the borrowing itself.

Getting money out is taxed twice

This is the one most often missed. Profit inside the company is taxed at corporation tax. When you take it out as a dividend, it is taxed again in your hands.

If you intend to spend the rental income, that second layer can cancel most of the advantage. If you intend to retain and reinvest it, the second layer is deferred and the company looks far better.

That single question - are you living off this income or compounding it? - decides more than any other.

Ongoing administration

• Annual accounts and a corporation tax return
• A confirmation statement
• Directors' duties and filing deadlines with real penalties
• An accountant who handles company work, which costs more than personal self-assessment
• Often a separate business bank account

Budget several hundred a year minimum, before any advice.

Less flexibility

The property is the company's, not yours. You cannot simply move in, gift it, or sell it and keep the proceeds personally without tax consequences at each step.

Moving existing properties in is usually the expensive mistake

Landlords hear the tax argument and ask how to transfer properties they already own. In most cases this is the worst version of the idea, because the transfer is treated as a sale at market value:

• Capital gains tax on the gain since you bought it
• Purchase tax or stamp duty payable by the company on the way in
• Early repayment charges on your existing mortgage
• New mortgage costs in the company's name
• Legal fees on both sides

A five-figure bill to save a few thousand a year is a long payback, and it can easily never pay back at all. There are reliefs that sometimes apply to genuine property businesses, but they are narrow, contested, and absolutely not something to assume.

The realistic version: keep what you own personally, and consider a company for future purchases. That avoids the transfer cost entirely.

When it genuinely wins

The pattern is clear enough: companies suit accumulation, personal ownership suits income.

How to actually decide

Do not decide from a forum post, including this one. Do this instead:

1. Work out your real cash flow under personal ownership, at your actual tax rate
2. Get a company mortgage quote for the same property - the rate difference is a real, recurring number
3. Model both over ten years, including whether you will draw the income out
4. Price the admin - accountant, filings, bank account
5. Then pay an accountant for an hour. This is one of the highest-return hours you will buy, because the answer depends on your income, your plans and your horizon

If the gap after all of that is small, personal ownership wins on simplicity alone.

Frequently asked questions

Does a company protect me from liability?

Partially, and less than people expect. Lenders usually require personal guarantees on the borrowing, which is the largest liability. Property owner's liability is handled by insurance either way - see Landlord Insurance.

Is it harder to get a mortgage?

Fewer lenders, higher rates, larger fees, and often a slightly lower interest cover requirement to compensate. The affordability arithmetic works the same way otherwise.

Can I pay myself a salary from it?

Yes, and it interacts with your other income and with corporation tax in ways worth planning rather than improvising. An accountant's territory.

What if I only ever buy one property?

For one property, the administration and worse mortgage terms usually outweigh the tax saving unless you are a higher-rate taxpayer with significant borrowing.

Does this apply outside the UK?

The specific driver - the interest relief restriction - is a UK feature. The structural trade-offs, double taxation on extraction, worse lending terms, administration, apply broadly. The conclusion may be completely different where you are.

The numbers you need before that accountant meeting

Every step above starts from the same figures: real cash flow per property, and mortgage interest separated from capital.

The Rental Property Tracker produces both, per property, across up to twenty properties - which is exactly the schedule an accountant will ask you to bring. $27 once.

To model a purchase before you decide the structure, the free Rental Yield & Cash Flow Calculator gives you the cash flow at any rate.

General information for landlords, not tax, legal or financial advice. Corporate and personal tax treatment, available reliefs, stamp duty and lending criteria differ substantially between countries and change frequently. This is a simplified summary of a genuinely complex area and must not be relied on for a decision. Speak to a qualified accountant about your own circumstances.