HMO Yield Calculator: Gross & Net Rental Yield

HMO yield calculator criteria: what lenders look for

Lenders do not underwrite a brochure yield. They take the rents the valuer will accept, strip rooms that fail size or licence tests, and stress what is left. A 12% gross yield that depends on seven occupiers in a C4 house is not a lender yield. Confirm occupancy against the licence and the planning use before you treat this HMO yield calculator as a buying case. Experience, ICR and LTV sit on the named lender’s page — TMW, Paragon and Aldermore publish those tests; this tool does not.

A first-time landlord with a thin deposit will be judged on cover, not on a high gross yield. Do not call a lender first-time-friendly unless that lender’s own HMO page says so. See HMO mortgages and HMO investment.

HMO yield calculator costs and fees

Net yield only works if the cost line is honest. Include utilities and broadband if the let is bills-inclusive, management or the hours you spend instead, insurance, licence fees, safety certificates, voids, maintenance and a sinking fund for fire doors and boilers. Purchase costs — stamp duty, legal, broker — belong in the capital figure, not in annual cost, or you double-count. Finance interest can sit in net yield if you want a cash-on-cash view; say which version you are modelling.

There is no unsourced “typical 25% cost ratio” presented as a limit on this page. Bills-inclusive professional houses often run hotter than a rent-exclusive let. If you do not know the bills, model a conservative allowance and tighten it when you have invoices.

How valuation affects HMO yield calculator

Yield is rent divided by value (or cost). Change the denominator and the percentage moves even if the rooms let the same. A bricks-and-mortar valuation can sit below an income valuation on a well-let larger HMO; the same rent on a higher value is a lower yield. That is arithmetic, not a better house. Read how HMO valuations work and use the HMO valuation calculator when you are asking what the house is worth, not what it yields.

On a remortgage the new lender’s valuation becomes the denominator. If they drop two rooms, yield on their figure can look higher while your borrowing falls. Do not celebrate a higher yield that came from a down-valuation.

How the calculation works

Gross rental yield = (annual rent ÷ total property cost) × 100. Net rental yield = ((annual rent − annual costs) ÷ total property cost) × 100. Annual rent is the sum of the room rents you enter, times twelve, after any void you apply. Cost is price plus the purchase costs you include. The methodology card above this section repeats those formulas. The tool does not insert a live mortgage rate.

Returns, rent and yield

Gross yield is a marketing number. Net yield is closer to what you live on. Cash flow after finance can still be thin on a high net yield if you bought at a high LTV. Run the HMO mortgage calculator on the same inputs so the monthly loan sits next to the monthly rent. A house that yields 9% net and fails ICR is not a deal.

Room mix matters. Five large rooms that let to professionals can beat seven small rooms that fail the licence. Yield per square metre is a better check than yield per brochure bedroom.

HMO yield calculator vs alternatives

A single-let yield uses one tenancy and usually lower bills. An HMO yield uses room rents and higher operating cost. Do not compare a gross HMO figure with a net single-let figure. A holiday-let or serviced-accommodation model is a different tax and licensing stack; this tool is for a residential HMO.

Versus the mortgage calculator: that tool answers “what do I pay the lender?”. This one answers “what does the house return on cost?”. Versus the valuation calculator: that one capitalises rent into a value. Use all three on one scheme, then the matching guide pages, so Google and a human can tell them apart.

Remortgaging and refinancing

A remortgage revalues the house and restresses the current rent. If rents have risen and the occupancy is still lawful, the new loan can release capital. If you have drifted above the licence, the yield you show this calculator will not be the yield the new lender uses. Start with HMO remortgages. Product transfer will not usually revalue; it will not improve a yield that is stuck on an old bricks-and-mortar figure.

Development and bridging exits should be modelled on the finished rent and the exit lender’s valuation basis, not on the land cost alone. A high development yield on paper that needs a 9% exit cap rate will fail if the term lender uses bricks-and-mortar.

Worked example

Six rooms at £140 a week is £43,680 a year if every week is let. At 4 weeks void that is about £40,320. Running costs of £12,000 leave £28,320 net. On a £360,000 all-in cost, gross yield is about 12.1% and net about 7.9%. That is a method, not a forecast. Change one room to empty for a term or add a second kitchen’s electricity and the net figure moves first.

HMO council tax: who pays and how it is charged

Council tax is a running cost that belongs in net yield when the landlord pays it. Who is liable depends on the let and the dwelling. Official guidance is GOV.UK: who has to pay council tax, checked 22 October 2026. In many licensed HMOs the owner is liable; in a joint tenancy of a whole house the tenants often are. Do not assume one rule for every HMO. If you pay it, put the bill in annual costs. If the tenants pay it, do not.

What the result means for your mortgage

A strong net yield helps the story; it does not pass ICR on its own. The lender stresses their rent and their rate. If this calculator shows 8% net and the stressed cover fails, the mortgage fails. Use the result to decide whether to instruct a valuer, not as a promise of the loan.

FAQs

HMO yield calculator questions.

Next step: quote / speak to a specialist

Send the room rents, the bills you actually pay and the valuation basis you expect. We will not treat a brochure yield as cover. Your property may be repossessed if you do not keep up repayments on a mortgage or any other debt secured on it.