What are the upfront costs of buying a buy-to-let?

Beyond the deposit: stamp duty at the additional property rates, conveyancing and searches, a survey, mortgage arrangement and valuation fees, possibly a broker fee, plus initial works and compliance certificates before the first tenant. On a typical 150,000 pound purchase these extras commonly total 11,000 to 15,000 pounds on top of the deposit.

How big should a landlord's cash buffer be?

Hold three to six months of total property costs, meaning the mortgage payment plus insurance, and an allowance for maintenance. Single-property landlords should sit at the top of that range because one void affects 100% of their portfolio.

Can any purchase costs be added to the mortgage?

Some lenders allow the arrangement fee to be added to the loan, increasing interest paid over the term. Stamp duty, legal costs, survey fees and works cannot be mortgaged; they are cash on or before completion day.

Are upfront costs tax deductible?

Most acquisition costs, including stamp duty, legals and survey fees, are capital costs: not deductible against rent, but deductible against capital gains when you sell. Genuine repairs after purchase are usually revenue costs deductible against rental income, while improvements are capital. Keep every completion statement and invoice.

Upfront costs and buffers

The part of the deal nobody advertises: what completion actually costs and how much cash should still be in the account afterwards.

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A buy-to-let purchase costs the deposit plus roughly 8% to 10% of the price in unavoidable extras: stamp duty, legal work, survey, lender fees and pre-letting compliance. After all of it clears, you should still hold three to six months of mortgage and running costs in cash. If a deal only works with that buffer spent, the deal does not work.

Acquisition costs, itemised

Typical acquisition costs, 150,000 pound purchase in England
Item	Typical cost	When paid
Stamp duty (additional rates)	8,000	Completion
Conveyancing and searches	1,200 to 1,800	Exchange to completion
Survey (HomeBuyer level)	400 to 600	Before exchange
Mortgage valuation	0 to 300	Application
Lender arrangement fee	0 to 2,000 or 1% to 2% of loan	Completion or added to loan
Broker fee	0 to 500	On offer

Figures in pounds, indicative for 2026. Stamp duty shown for a 150,000 pound additional dwelling; see our stamp duty lesson for the bands.

The single biggest line is stamp duty, which we break down fully in stamp duty on buy-to-let property. The most commonly forgotten line is the arrangement fee, because percentage-based fees on limited company products can quietly exceed the legal bill several times over. Price every line before you offer; none of them is negotiable after exchange.

Setup and compliance before the first tenant

Budget before the property can legally earn

Gas safety record, EICR and an EPC rated E or better if the existing certificates are missing or stale: roughly 300 to 500 pounds combined.
Smoke alarms on every storey and carbon monoxide alarms where required: under 100 pounds, fitted.
Cleaning, locks, small repairs and decoration between purchase and listing: realistically 500 to 1,500 pounds even on tidy stock.
Furnishing if you let furnished: highly variable, frequently underestimated.
Letting agent tenant-find fee if you use one: typically two to four weeks' rent.

None of these items is large alone. Together they are commonly a month or two of rent spent before the first month of rent arrives, and they land in the same weeks as the completion payment. The full recurring picture, including voids, lives in running costs and void periods.

Sizing the buffer: three to six months, held, not hoped

The buffer is not what happens to be left over; it is a deliberate line in the budget, sized before you set your maximum price. Three months of mortgage plus running costs is the floor for an experienced landlord with multiple properties. A first property deserves six, because every risk lands on one asset: the void, the boiler, the rate rise at refix, and the tenant who stops paying all draw on the same account.

Treat the buffer as untouchable for anything except the property. It is not the holiday fund, and it is not the deposit on the next deal until property one has a year of stable history behind it. The investors who survive bad quarters are rarely the cleverest; they are the ones who were never forced to sell.

Worked example: the full cash requirement

150,000 pound purchase, 75% loan to value

Deposit: 37,500. Stamp duty: 8,000. Legals, searches and survey: 2,000. Setup and compliance: 1,200. Subtotal committed: 48,700 pounds. Add a five-month buffer of roughly 4,000 pounds and the true cash requirement is about 52,700 pounds, which is 35% of the purchase price.

That ratio, a third of the price in cash, is a useful sanity check for any quick mental budget. It is also exactly the calculation the Clarity affordability calculator runs in reverse: cash in, honest maximum price out.

Frequently asked questions

What are the upfront costs of buying a buy-to-let?: Beyond the deposit: stamp duty at the additional property rates, conveyancing and searches, a survey, mortgage arrangement and valuation fees, possibly a broker fee, plus initial works and compliance certificates before the first tenant. On a typical 150,000 pound purchase these extras commonly total 11,000 to 15,000 pounds on top of the deposit.
How big should a landlord's cash buffer be?: Hold three to six months of total property costs, meaning the mortgage payment plus insurance, and an allowance for maintenance. Single-property landlords should sit at the top of that range because one void affects 100% of their portfolio.
Can any purchase costs be added to the mortgage?: Some lenders allow the arrangement fee to be added to the loan, increasing interest paid over the term. Stamp duty, legal costs, survey fees and works cannot be mortgaged; they are cash on or before completion day.
Are upfront costs tax deductible?: Most acquisition costs, including stamp duty, legals and survey fees, are capital costs: not deductible against rent, but deductible against capital gains when you sell. Genuine repairs after purchase are usually revenue costs deductible against rental income, while improvements are capital. Keep every completion statement and invoice.

Sources and further reading

Written by the Clarity Property Investments research team. Last reviewed 12 June 2026. This article is general information, not financial or tax advice.