A portfolio has three exits and they do not fetch the same number. You can sell it whole to one investor, split it into individual lots, or sell the company that owns it.
The route decides who can buy, how long it takes, and how much tax the buyer pays. That last one matters more than sellers expect, because a buyer prices their own tax bill into the offer, so it comes out of your price.
Tax rates and legal positions below were last checked in September 2026.
In short
- A portfolio has three exits: whole to one investor, split into lots, or sold as a company.
- Six or more dwellings sold as one lot can mean non-residential stamp duty, for example £89,500 on a £2m, ten-house portfolio.
- Split into ten lots sold to investors, the same portfolio carries £115,000 of stamp duty between the ten buyers, which shows up in their offers.
- Selling the company as shares means just 0.5% stamp duty, but the buyer takes on full due diligence and the latent tax on unrealised gains.
- A buyer prices a portfolio hard against its weakest unit.
If you would rather have the answer for your own portfolio, send us the schedule and the rent roll and we will tell you, free and honestly, which route pays.
Selling it whole, as one lot
One buyer, one completion, and a deal that either happens or does not. The pricing tension is that one buyer takes everything, including the units you would struggle to sell alone, and will typically price in a discount for doing so, larger the weaker those units are.
The offset is the buyer’s tax. Section 116(7) of the Finance Act 2003 treats six or more separate dwellings bought in a single transaction as not being residential property, which moves the purchase onto the non-residential stamp duty rates: nothing up to £150,000, 2% on the portion to £250,000, and 5% above that, with no additional property surcharge on top.
On a £2m portfolio of ten houses that is £89,500. Below six dwellings there is no equivalent, because Multiple Dwellings Relief was abolished for transactions completing, or substantially performing, on or after 1 June 2024.
Splitting the portfolio into lots
Selling unit by unit reaches owner-occupiers as well as investors, and an owner-occupier will usually pay more than an investor pricing the same house on yield. On the right stock that gap is the argument for splitting.
It costs time and it costs the six-dwelling rule. Those same ten houses at £200,000 each, sold separately to investor buyers, carry residential stamp duty plus the 5% additional property surcharge, which is £11,500 a house and £115,000 across the portfolio, against £89,500 sold as one lot.
Every sale is its own chain, survey and set of fees, and any tenanted unit is back to an investor buyer unless you take vacant possession first, which is a decision with its own arithmetic. Which route makes the most money depends on the stock: the owner-occupier premium has to outweigh the extra £25,500 of buyer-side stamp duty and the slower timeline, not just exist.
Most portfolios are not uniform, so a sensible move is to split the lots unevenly rather than evenly: block-sell the units an investor would take as one parcel, and market the rest individually. The six-dwelling rule decides whether that works.
Block-sell six of those ten houses for £1.2m and the buyer pays £49,500. Hold one back and sell five for £1m, and the block falls outside the rule, onto residential rates with the surcharge, at £93,750.
Block of six houses at £1.2m
£49,500
Block of five houses at £1m
£93,750
The smaller block costs the buyer £44,250 more on a parcel worth £200,000 less, and that lands on your price.
So count the block first: six is the number, they have to move as a single transaction to one buyer, and that buyer must stay unconnected to whoever buys the rest. Sell any of the remaining houses to the same buyer, or to someone connected to them, and HMRC links the deals under section 108 of the Finance Act 2003, recalculating the tax on the combined price.
Selling the company, not the buildings
Where the portfolio sits in a company, the buyer can buy the shares instead of the buildings. Stamp duty on a share purchase is 0.5%, so £10,000 on a £2m deal against £89,500 for the same portfolio as assets. That saving is why share sales get proposed, and it is not free.
The buyer inherits the company entire, so expect full due diligence and a warranty package. The unrealised gain on the buildings stays inside the company, and corporation tax on it falls due when the company eventually sells, so a buyer prices a discount against that latent liability.
Corporation tax is 19% on profits up to £50,000 and 25% above £250,000, with marginal relief between. On your side, if you hold the shares personally, a share sale is a disposal of shares rather than of property, and capital gains tax runs at 18% or 24% depending on where the gain falls against the basic rate band.
If you hold them through a holding company instead, that is corporation tax on the gain rather than capital gains tax, and the sums are different. We compare the routes in share sale or asset sale. Both computations belong on the table before anyone talks price, and both need your accountant’s numbers.
| Route | Who buys it | Buyer’s stamp duty, £2m portfolio |
|---|---|---|
| Whole, as one lot | One investor | £89,500 |
| Split into ten lots | Ten investors (owner-occupiers can buy vacant units) | £115,000 if all ten go to investors |
| The company, as shares | An investor buying the company | £10,000 |
Ten houses at £200,000 each. Stamp duty is the buyer’s cost, priced into their offer. A home mover replacing their main home with one of the houses would pay £1,500 at standard residential rates, with no surcharge.
What a buyer checks first
A buyer starts with the paperwork:
- The rent roll with twelve months of evidence.
- The tenancy agreements.
- The deposits and their prescribed information.
- The certificates.
Our handover checklist sets out that list from the buyer’s side, and a seller can work through it to prepare.
Then they find the weakest unit, because a portfolio is priced hard against its worst asset. One unlicensed HMO or one flat with a short lease drags the price of everything around it.
So does one property that will struggle to meet the higher EPC standard the government intends to require of rented homes by 2030. That standard still needs new legislation before it takes effect.
What this means for property investors
For an owner, pick the route before the portfolio is marketed, not after the first offer: the routes attract different buyers and switching mid-process costs months. Get the schedule complete and evidenced, because every gap becomes a discount.
Then set the sum of the parts against the whole-lot offer with both stamp duty positions in front of you, and take tax advice before you assume the 0.5% saves anyone anything. If the properties are in your own name, selling them is also a capital gains tax event for you, which our guide to capital gains tax on property covers.
For a buyer, the three routes are three different prices for the same bricks, and the six-dwelling rule is what makes a whole portfolio cheaper to buy than the sum of its units.
If you are weighing up selling a portfolio, get a free desktop valuation: send us the schedule and the rent roll and you will have an evidence-backed range, yours whether you sell or not. If you are buying, the portfolios on our books come with the schedule checked.