The 1% rule says the monthly rent a property can earn should be at least 1% of its total purchase price. It is the fastest way to decide whether a listing deserves your time. This guide covers the 1% rule and seven other filters investors use, with worked examples in naira.
Every serious property investor has the same problem: too many listings and too little time. Before you commission a survey, negotiate with a seller or engage a lawyer, you need a fast way to decide whether a property deserves your attention at all.
These rules of thumb are not a substitute for due diligence. Think of them as a sieve. They remove the obvious non-starters so you can spend your energy on the deals that might actually build wealth.
The 1% rule
The 1% rule is the most famous screening tool in rental property investing. The monthly rent a property can earn should be at least 1% of its total purchase price, including any renovation costs needed to make it rentable.
If you buy and refurbish a property for ₦100 million, the rule suggests it should rent for at least ₦1 million per month, or ₦12 million per year. A property that passes the test is likely to produce enough income to cover its costs and leave a profit. One that falls far short will probably struggle.
A note for Nigerian investors: the rule was designed for markets where rent is paid monthly. Here, tenants commonly pay annually, so convert the figures. A 1% monthly rule equals a 12% gross annual yield.
Be realistic, though. In many prime locations, including parts of Abuja, gross yields are often lower than 12% because prices are high relative to rents. Our own reference point for documented residential property in established Abuja areas is 6% to 10% gross a year. A property that misses 1% is not automatically a bad investment, especially if you expect strong capital appreciation. It means income alone will not carry the deal, and you should know that going in. Many local investors adjust the benchmark to a yield that reflects their own market and goals.
The 2% rule
The 2% rule is the more aggressive cousin of the 1% rule. It asks for monthly rent of 2% of the purchase price. Deals that meet it are rare in most markets today, and when they appear they usually come with trade-offs: older buildings, weaker locations, higher vacancy or heavier maintenance.
Treat the 2% rule as a signal of an unusually high-yield opportunity, then investigate carefully why the numbers look so good. A price that makes no sense is a warning, not a bargain.
The 50% rule
The biggest mistake new landlords make is assuming that rent equals profit. It does not. The 50% rule offers a corrective: assume that roughly half of your rental income will go to operating expenses, excluding your mortgage or loan repayments.
Those expenses include:
- Maintenance and repairs
- Service charges
- Property management fees
- Insurance
- Taxes and levies
- The periods when the property sits empty between tenants
If a property earns ₦10 million a year in rent, the 50% rule suggests you should plan on about ₦5 million being available before financing costs. The true figure may be lower for a new building with a low-maintenance finish, and higher for an old one, but the rule keeps your expectations grounded.
Gross rent multiplier
The gross rent multiplier (GRM) is simple: divide the purchase price by the annual gross rent. A property priced at ₦150 million that earns ₦15 million a year has a GRM of 10.
A lower GRM generally means you are paying less for each naira of income. The real value of GRM is comparison. When you are weighing several similar properties in the same area, the one with the lowest multiplier is often the better value on paper. Like the 1% rule, it ignores expenses, so use it to shortlist, not to decide. The gross rent multiplier is a standard measure if you want a second explanation.
Capitalization rate
The capitalization rate, or cap rate, is a step more rigorous. It divides the property's net operating income (annual rent minus operating expenses, but before financing) by its price.
If a property earns ₦12 million a year, spends ₦4 million on operating costs and costs ₦100 million to buy, its net operating income is ₦8 million and its cap rate is 8%. Because the cap rate accounts for costs, it is a more honest measure of a property's income performance. It also lets you compare very different assets, such as a block of flats against a commercial unit.
A higher cap rate usually means higher return but also higher perceived risk. Neither high nor low is automatically good. What matters is whether the rate is fair for the location, condition and tenant demand. Investopedia has a full explainer on the capitalization rate.
Cash-on-cash return
If you are using borrowed money, or simply want to know how hard your own cash is working, look at cash-on-cash return. Divide your annual pre-tax cash flow (after loan repayments) by the actual cash you invested, including deposit, fees and renovation.
Suppose you put ₦40 million of your own money into a deal and it generates ₦4 million a year after all costs and repayments. Your cash-on-cash return is 10%. This metric helps you compare a property against other uses of your money, such as treasury bills, fixed deposits or a different property altogether. Our guide to financing an investment property in Nigeria covers the borrowing side.
The 70% rule for flippers
Investors who buy, renovate and resell use a different filter. The 70% rule says you should pay no more than 70% of a property's after-repair value (ARV), minus the cost of repairs.
If a house will be worth ₦200 million once renovated and needs ₦30 million of work, your maximum offer is ₦140 million minus ₦30 million, which is ₦110 million. The 30% margin is meant to cover purchase and selling costs, holding costs and, crucially, the surprises that nearly every renovation produces.
The rule only works if your ARV estimate is accurate, so base it on genuine recent sales, not on asking prices.
Debt service coverage ratio
If you plan to finance a purchase, lenders will look at the debt service coverage ratio (DSCR): net operating income divided by annual loan payments. A ratio of 1.25 means the property earns 25% more than needed to service the debt. Anything close to or below 1.0 means the property cannot pay for itself, which is a warning sign for both you and your lender. Here is a short explainer on the debt service coverage ratio.
The limits of rules of thumb
Quick filters are valuable because they are quick, but their weakness is the same: they flatten complicated realities into a single number. Before committing to any deal, remember what the rules do not tell you.
- Location quality. Access to good roads, power, water, security and amenities drives both rents and resale value.
- Title and documentation. A fantastic yield means little if the title is defective or disputed. Always verify ownership and documentation independently. Our guide to verifying land ownership in Nigeria shows the order.
- Tenant demand. Check who actually rents in the area and how quickly similar units are let.
- Condition and hidden costs. A building survey can turn a promising deal into an expensive one.
- Growth prospects. Planned infrastructure and neighbourhood development can shape long-term returns. See the best areas to invest in Abuja.
Do not use any of these filters if you may need the money back within 12 months. Property is not liquid, and no ratio changes that.
Putting the filters together
A sensible approach is to use the filters in sequence:
- Start with the 1% rule or GRM to cut a long list of listings down to a handful.
- Apply the 50% rule to estimate real income.
- Calculate the cap rate and cash-on-cash return for your shortlist.
- If you are borrowing, check the DSCR.
- Only then invest in a full inspection, legal due diligence and negotiation.
The goal is not to find the perfect number. It is to make faster, better-informed decisions and avoid emotional ones. For the wider picture, read what to know before you invest in real estate in Nigeria and how to build a real estate portfolio.
Want a second opinion on a deal?
Send us the listing, the asking price and the rent you expect. We will run the numbers with you and check the title against the registry before you pay anything. We would rather tell you a deal fails the filters than sell you one that does.
Pentagon Homes & Properties Limited is RC 9023084. Call or WhatsApp +234 (90) 48098852, Monday to Friday 08:00 to 17:00 and Saturday 09:00 to 14:00.
What buyers usually ask us
What is the 1% rule in real estate?
The 1% rule says the monthly rent a property can earn should be at least 1% of its total purchase price, including any renovation needed to make it rentable. On a ₦100 million property, that means ₦1 million a month, or ₦12 million a year.
Does the 1% rule work in Nigeria?
As a first filter, yes, if you convert it. Tenants here commonly pay annually, so the rule becomes a 12% gross annual yield. Many prime locations, including parts of Abuja, come in lower than that. Missing 1% does not make a property a bad buy. It means income alone will not carry the deal.
What is the 50% rule in real estate?
The 50% rule assumes roughly half of your rental income goes to operating expenses, before any mortgage or loan repayment. A property earning ₦10 million a year in rent leaves about ₦5 million before financing costs.
How do you calculate cap rate?
Divide net operating income by the purchase price. Net operating income is annual rent minus operating expenses, before financing. A property that earns ₦12 million, spends ₦4 million on costs and costs ₦100 million has a cap rate of 8%.
What is a good gross rent multiplier?
There is no universal good number. GRM is the purchase price divided by annual gross rent, and a lower figure means you pay less for each naira of income. Use it to compare similar properties in the same area, not to make the final decision.
What is a good DSCR for a rental property?
A DSCR of 1.25 means the property earns 25% more than it needs to service the debt. A ratio close to or below 1.0 means the property cannot pay for itself, which is a warning sign for you and for your lender.