Buy-to-Let Costs UK: Buying, Running and Selling

Buy-to-let costs fall into three budgets: money needed to acquire the property, money needed to keep it running and money needed when you refinance or sell. The deposit is only the beginning. A useful appraisal shows all three, while keeping invested capital, operating expenses and cash reserves separate.

I want to know what a property will demand from my bank account as well as what rent it might produce. An attractive purchase can become uncomfortable if the budget includes the mortgage but misses the costs between completion and the next dependable rent payment.

Start with three budgets, not one headline figure

Some money is spent permanently and some remains yours in a different form. A deposit becomes equity, subject to changes in value. A reserve remains cash until used. Legal fees are a transaction cost. All need funding, but treating them as the same thing makes return calculations harder to understand.

What belongs in the purchase budget?

Start with the price and a mortgage illustration appropriate to your circumstances. Add the deposit, solicitor, searches, survey, valuation, broker and product fees where applicable. Check whether each fee is paid upfront, deducted from the advance or added to the loan. A fee financed through borrowing still has a cost.

Then include any sourcing fee, essential repairs, refurbishment, furniture and letting setup. An inventory, initial marketing or tenant-find fee may sit outside ongoing management. List it separately unless the written agreement clearly includes it.

Purchase tax depends on the property location and buyer circumstances. For the worked example below, a UK-resident individual buying an additional residential property in England pays illustrative SDLT of £8,000 on £150,000. Scotland and Wales use different purchase taxes. Check the official residential SDLT rates and have your solicitor confirm the actual position.

The cash tied up in the purchase is £54,000 here, with £3,000 retained separately. If you quote a return on cash invested, explain which denominator you use. If you are assessing whether you can fund the plan, the full £57,000 matters. Your household emergency fund should be considered separately.

What my Rugby walkthrough taught about a “light refurb”

In my published Rugby and Kettering case studies, I revisit a 2021 Rugby project bought for £165,000. During the discussion, the renovation allowance moved from around £10,000 to £12,000, with electrical work still an uncertainty.

Those were historical estimates, not a final set of invoices. That distinction is the lesson: “light refurbishment” describes an intention, not a fixed price. A kitchen that looked retainable and electrical work needing further checks could change the scope.

I would carry an unresolved item visibly in the appraisal, with an allowance and a next action to investigate it. Removing uncertainty from the spreadsheet does not remove it from the building. The existing refurbishment mistakes guide goes deeper into how that happens.

TRY YOUR OWN ASSUMPTIONS

Buying costs and running costs need separate budgets

This £150,000 additional-property illustration uses a 25% deposit. Change the works, rate and maintenance allowance to see both the starting cash and ongoing surplus.

Initial works (£)

£5,000

Interest-only mortgage rate (%)

5.5%

Monthly maintenance allowance (£)

£100

Starting cash, including £3,000 reserve£57,000

Monthly mortgage interest£515.63

Monthly surplus after allowances£170.38

Annual surplus before tax£2,044.50

Move a slider to explore the model.

Fixed assumptions: £112,500 debt, £8,000 additional-property SDLT for a UK-resident individual buying in England, £3,500 buying fees, £1,000 monthly rent, 5% void allowance, 12% management including VAT on collected rent, and £50 monthly insurance/compliance. Excludes service charges, sourcing fees, major works after purchase and tax. Replace assumptions with property-specific figures. Figures stay on this page and are not submitted or saved.

Reset example

Enable JavaScript to use the sliders. The default worked example remains readable below.

Where £1,000 of monthly rent goes

At the default tool settings, £1,000 rent is reduced by a 5% void allowance. Management is charged at an assumed 12% including VAT on the £950 collected. Mortgage interest is based on £112,500 at 5.5%, interest-only.

A rent receipt is not the same as spendable income

Mortgage interest£515.63

Management including VAT£114

Void allowance£50

Maintenance allowance£100

Insurance and compliance£50

Surplus before tax£170.38

That leaves £170.38 monthly, or £2,044.50 annually before rounding, tax and any omitted costs. A two-percentage-point increase in the interest-only rate adds £187.50 monthly on this debt, turning the model negative if nothing else changes.

Neither rate is a prediction or a mortgage quotation. The exercise shows how a thin surplus responds to a change you cannot ignore. Use the Mortgage Stress Calculator to explore a fuller range of assumptions.

Make recurring and irregular costs visible

Recurring charges are easier to see: mortgage payments, agent fees and a regular service charge. Irregular costs need deliberate planning: a replacement appliance, roof work, safety checks, decoration between tenancies and a period with no rent.

For a leasehold flat, review service charges, ground rent where payable and known major works. For an HMO, consider landlord-paid utilities, council tax, common-area cleaning, furniture, licensing and the appropriate finance and management arrangements. For a single let, establish who pays bills during an empty period.

A cost paid once a year can still be divided by twelve for planning. Keep its due date in a cash calendar, because averaging does not create money when the bill arrives. If insurance is already included in a service charge, avoid counting the same building cover twice.

Ask agents for the whole fee schedule rather than only the monthly percentage. Our letting-agent fees guide explains why tenant finding, inspections, contractor charges and other items can change the comparison.

Reserves and tax need separate treatment

Setting £100 aside monthly for maintenance is a sensible modelling choice only if it fits the property and the money actually remains available. It is not the same as a tax-deductible £100 expense having occurred that month. Similarly, a mortgage capital repayment reduces debt, but still consumes cash.

Taxable profit can differ from cashflow, particularly where finance costs, capital work and ownership structure are involved. HMRC's rental-income guidance distinguishes allowable running expenses from capital expenditure and explains that interest treatment differs between individual landlords and companies. Have an accountant model your actual position before deciding what income you can withdraw.

Budget for refinancing and selling before you need them

A refinance can involve early repayment charges, product fees, broker fees, valuation and legal costs. Compare the full transaction cost with the benefit, and include any additional interest if fees increase the borrowing. Cash released is not automatically the headline increase in valuation.

A sale can involve agent and legal fees, preparation work, a final void period, mortgage redemption and applicable tax. Equity before a sale is not the same as net proceeds after completing it. Keep a clear distinction between an estimated asset value and cash you could actually use.

You do not need to predict every invoice across twenty years. You do need to recognise which future events could require material cash, then avoid a plan that only works if none occurs.

A practical way to build the budget

1. Write every cost once. Put it under purchase, ownership or exit, and record whether it is paid in cash or financed.
2. Label the evidence. Separate confirmed charges, written quotes and your own allowances.
3. Keep the timing. Note when money leaves the account, not only its monthly average.
4. Protect the reserve. Decide what remains after completion and how it will be replenished.
5. Stress the weak points. Test repairs, vacancies and finance together, then reconsider the price or project if the result is uncomfortable.

When reviewing a property, I would rather discover a missing cost before making an offer than defend an attractive number afterwards. A properly funded deal gives you choices when the building or market behaves differently from the original plan.

Is the deposit a cost or an investment?

It is cash you need to fund, but it becomes equity rather than an immediate operating expense. Transaction fees are different. Show both when assessing affordability and explain what you include in any return calculation.

How much should I allow for repairs?

There is no reliable universal allowance for every property. Use condition, age, survey findings, known works and contractor input. Separate planned replacements from a reserve for surprises, and update the budget with actual experience.

Should I count a void as a cost?

It is lost rental income rather than an invoice, but it still affects cashflow. Budget separately for any bills, council tax or other expenses you must meet while the property is empty.

Prepared using information checked on 30 September 2026. Check the linked product pages for current availability and terms. This is general property education, not personal financial, mortgage, tax or legal advice. Models and examples are illustrative. Property values and income can fall, and outcomes are not guaranteed.