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Six units, two cities, three purchase years, one bank. Ask how to value a rental property and most owners with more than a couple of them are holding values from different eras: the purchase price on one, a refinance appraisal on another, a portal figure on the third. This guide covers one method for one unit and for all of them, the portfolio metrics your lender reads, the revaluation cadence, and a one-page sheet, with a six-unit example in Los Angeles and Phoenix. Rent is half of every rental's value, so if a unit's achievable rent is still open, the guide to how much can I rent my house for is the place to begin.
Why every unit needs the same method
Consistency is what turns a stack of numbers into a rental property valuation you can act on, for three reasons.
For comparison. A 2021 appraisal, a 2024 purchase price and a 2026 portal estimate cannot be added, ranked or compared. Only values produced by one method on one date tell you which unit carries the equity and which one earns the least on it, and therefore which to borrow against and which to sell.
For the bank. Portfolio and blanket loans test loan-to-value and debt service coverage against current values, usually once a year. Rates make this urgent: Freddie Mac's survey of September 24, 2026 showed a 30-year fixed rate of 7.03 percent, against 6.30 percent a year earlier1, so a loan that reprices carries more debt service against the same rent.
For insurers and owners. Insurers price replacement cost, not market value, and the two drift apart; a property manager reporting to owners needs a value the owner can trace to a method. The requirement is always the same: one method, one rent basis, one expense treatment, one date.
How to value a rental property: sales comparison, income or cost
The question "what is my rental property worth?" has a different answer for a house than for a fourplex, because different buyers set their prices.
| Approach | Logic | Inputs | Fits | Trap |
|---|---|---|---|---|
| Sales comparison | Recent sales of similar units, adjusted for differences, older sales moved to today with an index | Closed sales, county records, the FHFA metro or ZIP index2 | Houses and condos, whose buyers are owner-occupiers | Valuing a rented house by its rent when an occupier would pay more |
| Income | Net operating income divided by the market cap rate; gross rent multiplier as a screen | Actual and market rent (HUD Fair Market Rents as the floor3), vacancy (7.3 percent nationally in Q2 20264), operating expenses, local cap rates | Buildings of two units and more, whose buyers are investors | Using asking rents, skipping reserves, treating depreciation as an expense |
| Cost | Land value plus depreciated replacement cost of the building | Land sales, construction costs, age and condition | New buildings, insurance, unusual properties | Cost is not value where land is scarce: in the Los Angeles sample report the land alone is $1,120,000 to $1,260,000 of the value |
A single-family rental in a suburb sells to a family, so its value comes from what families paid for neighboring houses, and its rent is a return on that value rather than the source of it. A fourplex sells to an investor, so its value is its income capitalized. Where a submarket has both buyers, investment property valuation means running both approaches; the gap between them is information about which buyer to sell to.
Valuing by income: cap rate, GRM and where the expenses hide
Net operating income
Start with the rent the unit earns under its leases, or the market rent if a lease is far off market. Deduct a vacancy and collection allowance (7.3 percent nationally in the second quarter of 20264; your submarket may differ), then the operating expenses: property tax, insurance, repairs and maintenance, management, utilities you pay, and a reserve for roofs and systems. Publication 527 lists the deductible categories5 and doubles as a checklist for expenses landlords forget. Two items stay out: mortgage payments, because value is independent of financing, and depreciation, which lowers taxable income over 27.5 years for residential rental property56 but is not a cash cost.
Cap rate
Value equals NOI divided by the capitalization rate, and the cap rate comes from the market: the NOI of rentals that recently sold nearby, divided by their prices. A unit with $30,000 of NOI where similar buildings sold at a 6 percent cap rate is worth $500,000; at 5 percent, $600,000. A one-point move in the cap rate changes the value by roughly a sixth, so the cap rate deserves the same evidence as a comparable sale. Rents drift too: Realtor.com put the August 2026 median asking rent for studio to two-bedroom units across the 50 largest metros at $1,699, 0.9 percent below August 20257, so an income value built on last year's rent roll overstates today's.
Gross rent multiplier
Price divided by one year of gross rent. A $600,000 duplex renting for $4,000 a month has a GRM of 12.5. It compares listings in a minute and hides everything between rent and profit, starting with property tax: effective rates run 0.67 percent of value in Los Angeles County and 1.89 percent in Cuyahoga County8, so two buildings at the same GRM can earn very different returns. Formulas and benchmarks are in the guide to gross yield, net yield and cap rate.
How to value a rental portfolio: the four numbers lenders read first
Once every unit has a value on the same date, four numbers describe the portfolio.
- Loan-to-value (LTV): total debt divided by total current value. It protects the lender in a default and rarely binds in a portfolio held for years, since amortization and appreciation push it down.
- Debt service coverage ratio (DSCR): portfolio NOI divided by annual principal and interest. It shows whether the rent pays the bank, and it moves with rates: a refinance at 7.03 percent1 can turn a comfortable ratio into a thin one while LTV barely changes.
- Yield spread: the portfolio cap rate minus the borrowing rate. When the spread is negative, borrowing costs more than the assets yield, and additional debt lowers the return on your equity.
- Concentration: the share of value in one metro, one ZIP code, one building or one tenant. A portfolio that is 80 percent Los Angeles rises and falls with Los Angeles.
The expense side of these ratios, from taxes to reserves, is itemized in the real cost of owning a home.
How often to revalue, and how to roll values forward in between
A full revaluation of every unit once a year, on a fixed date aligned with your lender's reporting or your insurance renewal, is the backbone. Trigger events add interim updates: a refinance, a major renovation, a tenant turnover that resets the rent, storm or fire damage, or a nearby sale that changes the comparables.
Between full updates, roll each value forward with an index. The FHFA publishes its repeat-sales index for states and metro areas, and once a year for counties and five-digit ZIP codes2; multiply last year's value by the index change and mark the figure as a roll-forward, not a fresh valuation. On the rent side, HUD's Fair Market Rents update each fiscal year (FY2026 values took effect October 1, 2025)3, and Realtor.com's monthly rent report7 together with the Census Bureau's quarterly vacancy figures4 tell you whether the income assumptions still hold. Write the method down once: a method you can describe is one a lender, a partner or a buyer can audit.
A six-unit Los Angeles and Phoenix portfolio valued on one date
Every figure below is a hypothetical example, not a real portfolio. In August 2026 the median single-family home in Los Angeles County sold for $946,950 and the statewide condo median was $640,0009; Maricopa County's median home value was $452,800 in the Tax Foundation's 2026 county table (2024 data), with effective property tax rates of 0.67 percent in Los Angeles County and 0.44 percent in Maricopa County8. Vacancy is set at the national 7.3 percent4.
| Unit | Market | Type | Value and method | Rent a month | Gross yield | Property tax at the county rate |
|---|---|---|---|---|---|---|
| A | Los Angeles | 3-bed house | $960,000, sales comparison | $4,400 | 5.5 % | $6,400 |
| B | Los Angeles | 2-bed condo | $640,000, sales comparison | $3,150 | 5.9 % | $4,300 |
| C | Los Angeles | Duplex, two 2-bed units | $1,150,000, income, checked against sales | $5,900 | 6.2 % | $7,700 |
| D | Los Angeles | 1-bed condo | $470,000, sales comparison | $2,350 | 6.0 % | $3,100 |
| E | Phoenix | 3-bed house | $455,000, sales comparison | $2,250 | 5.9 % | $2,000 |
| F | Phoenix | 4-bed house | $520,000, sales comparison | $2,600 | 6.0 % | $2,300 |
| Total | $4,195,000 | $20,650 | 5.9 % | $25,800 |
Portfolio math, valuation date September 2026: gross rent is $247,800 a year; after 7.3 percent vacancy the effective income is about $229,700. Operating expenses: $25,800 in property tax, an assumed $14,000 in insurance, maintenance at 8 percent of effective income ($18,400) and management at 7 percent ($16,100), about $74,300 in all. Net operating income is about $155,400, a 3.7 percent return on the current value. Against $1,750,000 of debt at 7.03 percent over 30 years1, annual debt service is about $140,100: LTV is 41.7 percent, comfortable, and DSCR is 1.11, eleven cents of cushion per dollar of debt service. At $2,100,000 of debt the ratio drops to 0.92, which is why the coverage ratio, not LTV, decides how much this portfolio can refinance at today's rates.
The same table answers the sale question. Unit A earns the lowest gross yield because a South Bay family would pay more for that house than its rent supports, which makes it the natural sale candidate; but 77 percent of the portfolio's value sits in Los Angeles County, so selling a Phoenix house instead would raise the concentration. Decisions like that are only possible when every unit was valued the same way on the same day.
Three CheckValue Pro features that matter more for a portfolio than a house
Three features of the report matter more for a portfolio than for a single house.
Reproducibility. A unit valued in January and one valued in July must stand on the same footing, or the totals row is fiction. Every CheckValue valuation is stored in a registry, calculated in two separate runs that have to agree, and tested for plausibility, so an address with unchanged inputs returns an unchanged value. Keep your inputs equally disciplined (living area from one source, condition on one scale) and the method is consistent by construction.
Rent and yield beside the value. Each report estimates the rent and the gross yield on the value it has just derived, alongside the ownership costs. For a house valued by sales comparison this is the income-side check: when a rented house yields well below the rest of the portfolio, it is worth more to an occupier than to you, and the sale column of your sheet starts to fill itself in. The price index and market tempo printed with it are the two figures next year's roll-forward needs.
A ledger, not a folder. Reports stay in the account by date, so the history becomes the portfolio's valuation record. The PDF carries your letterhead for the owner report, and an owner abroad can receive it in German, French, Spanish or Italian.
For US addresses the report also states the county's owner of record, a first check on an acquisition target's title. It may not be used for credit, employment, insurance or tenant-screening decisions.
Where the report stops: it reads neither your leases nor your expense ledger, so NOI, LTV and DSCR stay your own calculation on the portfolio sheet; nor is it an appraisal that a lender will put in a loan file. The Pro page describes the plan; single reports are on the pricing page.
The one-page portfolio sheet for owners, banks and partners
This sheet is the whole of portfolio tracking for a landlord. One line per unit, one date for all of them, and these columns: unit, property type, valuation method, value date, value and range, source of the value (report, appraisal or index roll-forward), lease rent, market rent, vacancy assumption, operating expenses, NOI, loan balance, LTV, DSCR, next revaluation date. A totals row for value, rent, NOI, debt and the two ratios, and a change column against last year's sheet. The supporting report for each address goes in an appendix, so anyone who doubts a line can open the evidence behind it.
Two disciplines keep the sheet honest. Never mix methods in the totals row without a footnote saying which units were rolled forward and which were revalued. And never let a lease rent far above market flatter the NOI without a note on when that lease ends, because the bank will ask. Agents face the mirror image of this problem, one house and one seller at a time; the pre-listing valuation guide for agents covers that side.
When a lender needs a licensed appraisal instead
Internal valuations run the portfolio; they do not go in the loan file. A federally related transaction requires an appraisal by a state-licensed or certified appraiser unless an exemption applies, and the two exemptions that matter here are residential transactions of $400,000 or less and commercial transactions of $500,000 or less, for which the lender may rely on an evaluation instead10. The same regulation counts a transaction as residential only when it is secured by a single one-to-four-family property (§ 34.42), so a building of five or more units falls on the commercial side, and a portfolio refinance above the lines will bring an appraiser to each property10.
Your sheet still earns its keep at that moment. An appraisal that lands far from your consistently derived value is a signal: either your comparables or the appraiser's need a second look, and a documented method gives you standing to ask. The official series behind both sides of that conversation are described in the guide to official data sources for home values. This is general information, not legal or tax advice.
Owners with several units in Tenerife asked me the same thing every winter, and it was never what one particular unit was worth. It was why this one had been valued differently from that one. Once every unit was valued the same way on the same date, the question disappeared, and the conversation moved to what to sell and what to refinance.
Frequently asked questions
How do you value a rental property?
Use the approach that matches the likely buyer. Houses and condos sell to owner-occupiers, so recent sales of similar homes, adjusted for differences, set their value. Buildings with several units sell to investors, so net operating income divided by the local cap rate sets theirs. Rent inputs come from your leases and HUD Fair Market Rents, vacancy from the Census Bureau's quarterly survey, and the same method should be applied to every unit on the same date.
How do you value a rental property based on rental income?
Take the annual rent the unit earns, deduct a vacancy allowance (7.3 percent in mid-2026) and the operating expenses (not mortgage payments or depreciation) to get net operating income, then divide by the capitalization rate at which similar rentals have sold nearby. A unit with $30,000 NOI at a 6 percent cap rate is worth $500,000. Check the result against comparable sales; asking rents in August 2026 were 0.9 percent below a year earlier.
What is the gross rent multiplier?
The gross rent multiplier is price divided by one year of gross rent: a $600,000 duplex renting for $48,000 a year has a GRM of 12.5. It is only a screen for listings, because it ignores everything between rent and profit. Property tax alone runs 0.67 percent of value in Los Angeles County and 1.89 percent in Cuyahoga County, so two buildings with one GRM earn very different returns. Use cap rate for decisions.
How often should a landlord revalue properties?
Once a year on a fixed date, timed to your lender's reporting or insurance renewal, plus after trigger events: a refinance, a major renovation, a tenant turnover that resets the rent, storm or fire damage, or a nearby sale that changes the comparables. Between full revaluations, roll each value forward with the FHFA metro or ZIP-code price index and note that you did so. The value date and the method belong on the sheet next to the number.
Why do lenders and insurers ask for current values?
Lenders test two covenants against current values: loan-to-value, which protects them if you default, and the debt service coverage ratio, which shows whether net operating income covers the payments. With the 30-year rate at 7.03 percent in late September 2026, coverage is usually the tighter constraint in a refinance. Insurers ask because replacement cost and market value drift apart, and an underinsured building is a claim they will contest. Both want a date and a method.
Should I value my rentals by comps or by income?
By comps for single-family houses and condos, because the buyer who sets their price lives in them and pays for the kitchen rather than the yield. By income for buildings of two units and more, because their buyers pay for the net operating income. Where a market has both kinds of buyers, run both approaches and treat the gap as information: a house worth more to an occupier than its rent supports is a sale candidate, not a hold.
How do property managers value properties for owners?
The good ones value every managed unit the same way on the same date each year and report it on one page: value and range, method, rent, vacancy assumption, net operating income, debt, loan-to-value and coverage, with the supporting report for each address attached. Internal valuations serve decisions and covenant reporting; when an owner refinances above the federal thresholds, the lender orders a licensed appraisal and the manager's sheet becomes the document that checks it.
This article is general information, not legal, tax or investment advice. Figures and rules carry the year they were published; check the cited source for the current version.
Josef Eckmair MBA is co-founder of CheckValue and managing director of CBDNOL GmbH (Ansfelden, Austria). He has more than 20 years of real estate experience in Tenerife and Austria and writes about appraisals, taxes, selling costs and valuations for professionals.
Articles by Josef Eckmair →Sources
- 1statisticsPrimary Mortgage Market Survey (PMMS), weekly mortgage ratesFreddie Mac · 2026The 30-year fixed rate averaged 7.03 percent in the week of September 24, 2026, up from 6.95 percent the week before and 6.30 percent a year earlier; the rate behind the debt-service math.freddiemac.com ↗
- 2statisticsFHFA House Price Index Datasets (states, metros, ZIP codes, expanded data)Federal Housing Finance Agency · 2026The repeat-sales index tables by state, metro area and five-digit ZIP code used to roll a portfolio's values forward between full revaluations.fhfa.gov ↗
- 3statisticsFair Market Rents (40th percentile rents)U.S. Department of Housing and Urban Development (HUD User) · 2026FMRs are estimates of 40th-percentile gross rents for standard-quality units by metro area or county, effective each October 1 (FY2026 from October 1, 2025); the official floor for a market-rent assumption.huduser.gov ↗
- 4statisticsHousing Vacancies and Homeownership (CPS/HVS), second quarter 2026U.S. Census Bureau · 2026Released July 28, 2026: a national rental vacancy rate of 7.3 percent and a homeowner vacancy rate of 1.2 percent in the second quarter of 2026; the vacancy assumption for the income approach.census.gov ↗
- 5officialPublication 527 (2025), Residential Rental PropertyInternal Revenue Service · 2026The deductible rental expense categories (maintenance, insurance, taxes, interest, management, depreciation) that define the operating-expense lines of a rental's net operating income.irs.gov ↗
- 6officialPublication 946 (2025), How To Depreciate PropertyInternal Revenue Service · 2026Residential rental property is depreciated over 27.5 years under the general depreciation system; depreciation lowers taxable income but is not an operating expense in a valuation.irs.gov ↗
- 7statisticsRealtor.com Research: housing data and market trends (monthly listing, rent and days-on-market figures)Realtor.com · 2026The August 2026 rental report: a median asking rent of $1,699 for studio to two-bedroom units in the 50 largest metros, down 0.9 percent year over year; the reason an income value built on last year's rents drifts.realtor.com ↗
- 8statisticsProperty Taxes by State and County, 2026Tax Foundation · 2026Effective property tax rates by county (2024 data): 0.67 percent in Los Angeles County, 0.44 percent in Maricopa County, 1.89 percent in Cuyahoga County; the five highest-burden counties (in New York, New Jersey and Wisconsin) exceed 2.95 percent and the five lowest fall below 0.18 percent.taxfoundation.org ↗
- 9statisticsAugust 2026 home sales and price report (county medians)California Association of REALTORS® (C.A.R.) · 2026Los Angeles County median single-family price of $946,950 and statewide condo median of $640,000 for August 2026 (released September 16, 2026); the price level of the worked example.car.org ↗
- 10law12 CFR 34.43, Appraisals required; transactions requiring a State certified or licensed appraiserOffice of the Comptroller of the Currency (eCFR) · 2026Federally related transactions need a state-licensed or certified appraiser unless exempt; residential transactions of $400,000 or less and commercial real estate transactions of $500,000 or less may rely on an evaluation instead, and the subpart's definitions (§ 34.42) class a transaction as residential only when a single one-to-four-family property secures it.ecfr.gov ↗
