Who we helpIndustry guide

The landlord accountant who knows property tax.

Rental income, allowable expenses and your tax return, handled by a landlord accountant who understands property.

You bought property to build wealth, not to wrestle with HMRC every January. As a specialist accountant for landlords, we take your rental accounts, allowable expenses and Self Assessment off your hands. One flat, a buy-to-let portfolio, a furnished holiday let, or property held through a company? We get the numbers right, claim everything you are owed, and keep your property tax as low as the rules allow. Book a call with a landlord accountant who actually knows the difference between a repair and an improvement.

  • 4.9 Google · 63 reviews
  • ACCA-qualified
  • 30-day money-back
Modern apartment building exterior
The problem

Why a Generic Accountant Often Gets Landlords Wrong

Most accountants can file a tax return. Far fewer understand property, and with rental income that gap costs you money.

They treat a new boiler the same as fixing the old one. They miss the way mortgage interest relief now works. They never ask whether your portfolio belongs in a company. So you either overpay, or you claim something HMRC later disallows.

A specialist landlord accountant works the other way round. We know property tax, so we know where landlords lose money and where they get caught out. We do not just record your rents and costs. We make sure the numbers are right and the bill is as low as the rules allow.

Tailored services

What We Handle, So You Don't Have To

  • 01

    Rental accounts and tax return

    We pull your rents and costs into clean property accounts, then file your Self Assessment on time, every allowable expense claimed.

  • 02

    Allowable expenses, claimed in full

    Letting agent fees, insurance, repairs, service charges and finance costs. We claim what counts and flag what HMRC treats as capital.

  • 03

    Mortgage interest relief

    The relief on your buy-to-let finance costs is now a tax reduction, not a deduction. We apply it right so you pay the correct tax, not more.

  • 04

    Personal vs company ownership

    We model holding property personally against a limited company, including the transfer costs, so you make the call with the full picture.

  • 05

    Furnished holiday lets

    The separate FHL tax regime ended in April 2025. We handle the transition and tax your holiday property correctly under the rules that apply now.

  • 06

    Capital Gains on disposals

    When you sell, we calculate the gain, apply the reliefs you are due, and meet the property CGT reporting deadline for you.

Rental income and expenses

Rental Income and What You Can Actually Claim

Rental profit is your rent received, less the costs of letting the property. Get the costs right and you pay tax on the true profit, not a penny more.

The catch is the line between a repair and an improvement. A repair to put something back as it was is an allowable expense against your rental income. An improvement that betters the property is capital, and it counts later against Capital Gains Tax instead. Get this wrong and HMRC will, sooner or later, notice.

As an accountant for landlords, we sort your costs into the right boxes and claim everything you are genuinely owed.

  • Letting agent and management fees
  • Landlord and buildings insurance
  • Repairs and routine maintenance
  • Ground rent, service charges and council tax (when you pay it)
  • Safety certificates, gas and electrical checks
  • Accountancy fees and the cost of running the let
  • Replacing domestic items in a furnished let

We handle your Self Assessment and the bookkeeping behind it, so your rental records are ready long before the January deadline.

Finance costs

Mortgage Interest Relief: How It Really Works Now

This is where most landlords lose money, and where a generic accountant most often slips up.

You used to deduct your mortgage interest straight off your rental income before tax. That full deduction is gone. Instead, your buy-to-let finance costs now give you a tax reduction, applied after your profit is worked out.

For higher earners especially, that change can push more of your rental income into a higher tax band and leave you paying more than you expect. A good landlord accountant applies the relief correctly, shows you exactly what it costs you, and factors it into any decision about how you hold your property.

We do not pretend the old rules still apply. We work with the rules as they are and plan around them.

Ownership structure

Owning Property Personally vs Through a Company

Hold property in your own name and the rental profit is taxed through Self Assessment, alongside your other income. It is simple, and for many landlords it is the right answer.

Hold it through a limited company instead and the company pays Corporation Tax on its profit, with finance costs treated differently to personal ownership. You then draw money out as salary and dividends, which brings its own tax. Many landlords with larger or growing portfolios look hard at this route.

But incorporating is not free. Moving existing property into a company can trigger Capital Gains Tax and Stamp Duty, and a company means annual accounts at Companies House and tighter record-keeping. The benefit has to clear those costs.

The honest answer is: it depends on your income, your borrowing and your plans. We model both before you commit, so you decide with real numbers in front of you, not a rule of thumb from a forum.

Holiday lets

Furnished Holiday Lets: What Changed in April 2025

Furnished holiday lets used to get their own tax treatment, but that regime was abolished from 6 April 2025. There is no longer a special FHL category to qualify for.

If you let a holiday property, it is now taxed like any other rental business. The old advantages have gone: the separate capital allowances on furnishings, the more generous Capital Gains reliefs, and counting the profits as earnings for pension purposes.

If you held an FHL, the job now is handling that transition cleanly, so your mortgage-interest treatment, your expenses and any future sale are all dealt with correctly under the rules that actually apply today. We do exactly that.

Selling up

Capital Gains Tax When You Sell

Sell a rental property for more than you paid and you have a capital gain, and HMRC wants its share. For residential property there is a tight deadline to report the gain and pay the tax after completion, separate from your normal tax return.

The gain is not simply your sale price less your purchase price. You can take off buying and selling costs and the capital improvements you made over the years, which is exactly why we track those improvements as they happen rather than scrambling for receipts at the end.

Reliefs may also reduce the bill, particularly if the property was once your own home. We work out the gain, apply every relief you are due, and make sure you meet the reporting deadline so a late filing penalty never lands on top.

Making Tax Digital

MTD and Managing a Portfolio

Making Tax Digital for Income Tax is coming for landlords. Once your property income passes the threshold, you will keep digital records and send HMRC updates through the year, not just a single return each January.

For a landlord with several properties, that only works if your bookkeeping is tidy from the start. We set you up with compliant software, get your rents and costs flowing in property by property, and keep you ready well ahead of the deadline.

With a portfolio, the small things add up: tracking each property separately, splitting jointly owned lets correctly, and keeping the capital improvements logged for the day you sell. We carry that load so you can keep buying and letting, not bookkeeping.

Simple, fixed fees

Fixed Monthly Pricing & Packages for Landlords

Most landlords pay between £99 and £199 a month, with the fee set by the size of your portfolio, not by the hour.

No hourly rates. No surprise bills at year-end. One fixed fee, a named, qualified accountant who knows property, and a 30-day money-back guarantee.

  • Essentials

    Startups and small companies that need essential compliance and year-end support without VAT or payroll.

    £99/month
    • Preparation of Company Year-End Financial Statements
    • Year End Corporation Tax Computation
    • Submission of CT600 to HMRC
    • Statement of Account submissions to Companies House
  • Premium Plus

    Growing businesses that need complete accounting services, VAT return management, and payroll handling.

    £199/month
    • Everything in Essentials
    • Quarterly VAT return calculation and submission
    • Payroll and benefits management
  • Enterprise

    Established businesses that want strategic mentoring, business planning, and a part-time finance director driving growth.

    £499/month
    • Everything in Premium Plus
    • Business mentoring
    • Part-time finance director
    • Business plan
Trusted by landlords

What Our Clients Say.

  1. I’ve used several accountants in the past, but hands down there is no one better than Harvey at Zmartly. He really understands exactly what advice you’re looking for and explains everything clearly and professionally. Nothing ever feels rushed…
    Google reviewer Heena
    HeenaVerified Google review · 4 months ago
  2. I’ve had an excellent experience working with Zmartly. Harvey and the team are professional, responsive, and genuinely supportive. They explain things clearly, stay on top of deadlines, and always look for practical ways to save tax and improve…
    Google reviewer land4 success (chill feel good)
    land4 success (chill feel good)Verified Google review · 5 months ago
  3. I started working with Zmartly Accountants after having serious issues with my previous accounting firm. They were missing deadlines, incorrectly calculating VAT, constantly late, and extremely difficult and frustrating to communicate with. Switching to Zmartly was a huge…
    Google reviewer Jorge Carballo Gomez
    Jorge Carballo GomezVerified Google review · 5 months ago
  4. Great proactive service always up to date regarding accounting legislation. Harvey and Team will be always helping you with advise how to make your books look good. Already over 4 years using their service very happy.
    Google reviewer Auris Property Academy
    Auris Property AcademyVerified Google review · 8 months ago
  5. I've had a terrible experience with multiple accountants. Zmartly have been incredible. If you do ecommerce / Amazon FBA you definitely need to go with someone who understands the complexities with it. Thanks to Harvey and his amazing…
    Google reviewer Sean Barrington
    Sean BarringtonVerified Google review · 5 months ago
  6. I’ve used several accountants in the past, but hands down there is no one better than Harvey at Zmartly. He really understands exactly what advice you’re looking for and explains everything clearly and professionally. Nothing ever feels rushed…
    Google reviewer Heena
    HeenaVerified Google review · 4 months ago
  7. I’ve had an excellent experience working with Zmartly. Harvey and the team are professional, responsive, and genuinely supportive. They explain things clearly, stay on top of deadlines, and always look for practical ways to save tax and improve…
    Google reviewer land4 success (chill feel good)
    land4 success (chill feel good)Verified Google review · 5 months ago
  8. I started working with Zmartly Accountants after having serious issues with my previous accounting firm. They were missing deadlines, incorrectly calculating VAT, constantly late, and extremely difficult and frustrating to communicate with. Switching to Zmartly was a huge…
    Google reviewer Jorge Carballo Gomez
    Jorge Carballo GomezVerified Google review · 5 months ago
  9. Great proactive service always up to date regarding accounting legislation. Harvey and Team will be always helping you with advise how to make your books look good. Already over 4 years using their service very happy.
    Google reviewer Auris Property Academy
    Auris Property AcademyVerified Google review · 8 months ago
  10. I've had a terrible experience with multiple accountants. Zmartly have been incredible. If you do ecommerce / Amazon FBA you definitely need to go with someone who understands the complexities with it. Thanks to Harvey and his amazing…
    Google reviewer Sean Barrington
    Sean BarringtonVerified Google review · 5 months ago
4.9
Google · based on 63 reviews
Common questions

Frequently Asked Questions

Because of the Section 24 finance-cost restriction, fully in force since April 2020. Mortgage interest is no longer an allowable expense against rental income, instead you get a tax reduction worth 20% of the lower of your finance costs, your property profits, or your income above the personal allowance. For higher-rate taxpayers this is far less generous than the old deduction, and it can push your taxable income into a higher band, which is exactly where we recalculate to make sure nothing extra is paid.

Within 60 days of completion you must file a UK property CGT return and pay the tax due, separately from your annual Self Assessment. For 2025/26 residential property gains are taxed at 18% within your basic-rate band and 24% above it, after your £3,000 annual exempt amount. Late reporting attracts penalties and interest, so we prepare the figures the moment a sale is agreed.

If your qualifying gross property (and self-employment) income is over £50,000, MTD for Income Tax applies from April 2026; the threshold falls to £30,000 from April 2027 and £20,000 from April 2028. Once mandated you must keep digital records and send quarterly updates plus a final declaration through compatible software. We get you set up early so it's routine, not a panic.

It depends. The first £1,000 of rental income can be tax-free under the property allowance, but if you claim it you cannot also deduct actual expenses or replacement of domestic items relief for that property. For most landlords with mortgages, agent fees and repairs, claiming real expenses wins easily. We test both each year and use whichever leaves you better off.

Genuinely incurred, wholly-and-exclusively revenue costs: letting and management fees, repairs and maintenance (not improvements), buildings and contents insurance, ground rent and service charges, accountancy fees, allowable travel, and the cost of replacing, but not initially buying, furnishings and white goods under replacement of domestic items relief. Capital improvements aren't deductible against income but reduce your eventual CGT, so we track them carefully.

Buying an additional residential property in England or Northern Ireland normally carries a higher-rate surcharge of 5 percentage points above the standard SDLT rates, in force since 31 October 2024 (up from 3%). It applies on top of the standard bands, so on portfolio purchases it adds up fast, we factor it into any incorporation or acquisition decision before you commit.

Yes. UK-resident landlords must declare overseas rental income on their Self Assessment, with relief for foreign tax under double-taxation rules. If you're a non-resident landlord, we register you under the Non-Resident Landlord Scheme so your agent or tenant doesn't withhold 20%, and we handle your UK CGT on any disposal.

Stop guessing. Stop overpaying. Let's sort your tax once and for all.

Zmartly Ltd · 20–22 Wenlock Road, London N1 7GU · 020 8175 5145 · info@zmartly.co.uk

ICAEW, ACCA and AAT qualified accountants.