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How to Know If Your Rental Property Is Really Making Money: The 4-Number Test Every Owner Should Run

April 15, 20269 min read

Real Estate Investing, Rental Property Performance

How to Know If Your Rental Property Is Really Making Money

You own rental property to build wealth, create income, or fund your retirement. The key question often stays fuzzy. Is each rental you own really making money after all costs and inflation?This guide uses the P in the PLAN framework from Property Decisions by Dan and Julie Ihara. You will learn four simple numbers that give you a clear picture for every property you own.

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The Four Numbers You Need to Know

Most rental owners can tell you two things. What they paid. What they think the property is worth today. That is a start. It does not tell you if the property still earns its place in your portfolio.

For that, you need four clear numbers for each rental you own.

  1. Current value

  2. Cost basis

  3. Capital gains exposure if you sold

  4. Cap rate

Line these up, and you see if the property grows your wealth or quietly holds you back. You can track all four on one simple worksheet. Pull the Asset Performance worksheet at free.danihara.com/asset-tool to keep the same format for every property.

1. Current value

Current value is what you could sell the property for in today's market. Estimate this from recent sales of similar homes. You can also use a broker price opinion or appraisal for more detail. Use a number you could reasonably expect, not the best case.

This matters because it tells you how much equity is locked in that property. Your returns should match the size of that equity.

2. Cost basis

Cost basis is what you have into the property for tax purposes. It starts with your purchase price. Add buying costs, like closing costs and major improvements. You may subtract items like land value when you calculate depreciation.

For this exercise, keep it simple. Use your purchase price plus big upgrades like a new roof, kitchen, or addition. Cost basis matters because the tax law uses it to figure your capital gain when you sell.

3. Capital gains exposure if sold

Capital gains exposure is the gain you would show if you sold today. In plain language, it is your current value minus your cost basis, minus selling costs. Selling costs include commission, escrow, and other fees. This number does not include taxes you would pay. It shows how much gain sits inside the property.

A large gain can feel good. It also means more tax exposure if you sell without a plan. That is why the Ihara PLAN framework ties property choices to your bigger life goals.

4. Cap rate

Cap rate is the one number most rental owners skip. It tells you how hard your equity works for you. Cap rate looks at the income the property produces. It compares that income to the current value. You ignore the loan in this number. You focus on the property itself.

This helps you compare one rental to another, and to other investments. You will learn how to calculate cap rate in under ten minutes in the next section.

How to Calculate Cap Rate in Under 10 Minutes

To find cap rate, you need two pieces of information. Net operating income, or NOI, and the current value of the property. You can do this with a simple calculator and last year's numbers. Set aside ten minutes. Pull your rent roll and your expense records. Walk through it step by step.

Step 1. Find your annual gross rent

Take the monthly rent your tenant pays. Multiply by 12. If you had any months vacant, subtract that lost rent.

For example, your tenant pays 2,500 dollars per month. You had one empty month. Your collected rent for the year equals 2,500 times 11, or 27,500 dollars. This is your gross rental income for the year.

Step 2. List your operating expenses

Operating expenses are the costs to run the property. They include property taxes, insurance, repairs, maintenance, utilities you pay, property management fees, and HOA dues. Do not include your mortgage payment. Do not include income taxes or major one-time upgrades. Add up these operating costs for the same year as your rent number.

For example, your yearly costs look like this:

  • Property tax: 4,000 dollars

  • Insurance: 1,200 dollars

  • Repairs and maintenance: 1,800 dollars

  • Management: 2,200 dollars

  • HOA: 1,000 dollars

Your total operating expenses equal 10,200 dollars.

Step 3. Calculate your NOI

Net operating income, or NOI, is your gross rent minus your operating expenses. Using the example above, your gross rent is 27,500 dollars. Your operating expenses are 10,200 dollars. Your NOI equals 27,500 minus 10,200, or 17,300 dollars. This is the income the property produces before debt service and income tax.

Step 4. Divide NOI by current value

Take your current value from the earlier step. Say the property is worth 700,000 dollars today. To find cap rate, divide NOI by current value. In this case, 17,300 divided by 700,000 equals 0.0247. Move the decimal two spots to the right. Your cap rate is about 2.5 percent. That is the yearly return your property produces before debt and tax, based on its current value.

Step 5. Repeat for each property

You now have a simple process. Repeat it for every rental you own. Once you list all your cap rates side by side, you see which properties pull their weight and which ones lag. You also see how your rentals compare to other options, like bonds or different properties.

Why NOI and Adjusted Cash Flow Matter More Than Rent

Many owners focus on gross rent. You might say, my tenant pays 3,000 dollars per month, so this property works great. The problem: rent alone ignores the cost side. A property with high rent and even higher expenses can drain you. NOI and adjusted cash flow give you a clearer picture.

Net operating income shows the engine

NOI strips out the noise. It looks at the income the property produces after normal operating costs. It ignores how you chose to finance the property. This lets you compare two different rentals on equal terms.

One property might have a lower mortgage payment because you put more down. That does not mean the property itself performs better. NOI focuses on the property's own engine, not the loan you used to buy it.

Adjusted cash flow shows what lands in your pocket

Adjusted cash flow takes the next step. It starts with NOI. Then it subtracts your mortgage payments, both principal and interest. It may also subtract reserves you set aside for future capital items, like a roof or major system.

The result shows what actually lands in your pocket each year. This is the number you feel in your monthly budget. It tells you if the property supports you, or if you support the property.

When you look at both NOI and adjusted cash flow, you see two angles. NOI shows how strong the asset itself performs. Adjusted cash flow shows how your financing choice and reserves affect your monthly life. Both matter. Both matter more than gross rent alone.

The 2 Percent Inflation Test

Now you know how to find cap rate. You still need a way to judge if that number is good enough. The Ihara PLAN framework uses a simple rule of thumb. The 2 percent inflation test.

Over time, prices rise. Your dollars lose some buying power each year. If your property returns less than 2 percent, it does not even keep up with that slow rise in prices. It loses ground in real terms.

Look back at the example cap rate of about 2.5 percent. That property passes the 2 percent test by a small margin. It may still not reach your long-term goals. It at least keeps pace with basic inflation.

Now think about a property with a cap rate of 1 percent. On paper, it may show a profit. In real life, after inflation, your buying power shrinks each year. The property feels safe. Really, it slowly erodes your wealth.

Use the 2 percent test as a first filter. If a rental does not clear 2 percent on cap rate, ask hard questions. Can you raise rents in a fair and legal way? Can you trim expenses without cutting quality or safety? If not, you may need to look at a sale or an exchange into a stronger property that better fits your PLAN.

What to Do Once You Have the Numbers

At this point, you know your four key numbers for each rental. Current value. Cost basis. Capital gains exposure if sold. Cap rate. You also understand your NOI and adjusted cash flow. You have a clear, honest picture of how each property performs. The next step is to line these numbers up with your life goals and your time frame.

Start by grouping your properties into three buckets:

  • Strong keepers have solid cap rates, healthy adjusted cash flow, and pass the 2 percent test with room to spare.

  • Clear underperformers fall below 2 percent and show weak cash flow.

  • Middle cases sit near your minimum standard. They may improve with focused action.

For each underperformer, ask three questions.

First, can you improve income? That might mean better tenant screening, modest rent increases within local rules, or small upgrades that justify higher rent.

Second, can you reduce expenses? Review insurance, shop management fees, or address recurring repair issues with one smart upgrade.

Third, if you cannot improve it enough, does it still earn its place in your PLAN? Sometimes the best move is to reposition that equity into a property with stronger income, or into a structure that better supports your retirement or legacy goals.

For your strong keepers, your job is simpler. Protect them. Keep good records. Plan for capital items. Make sure your financing still fits your stage of life. You may adjust loans to improve cash flow or reduce risk as you near retirement.

The key point: you now make these choices with clear numbers, not with guesswork or habit.

Put It All in One Place

You do not need complex software to manage this. You need a repeatable system and the discipline to update it at least once a year.

Pull the free Asset Performance tool at free.danihara.com/asset-tool.

List each property. Enter your four numbers: current value, cost basis, capital gains exposure, and cap rate. Add your NOI and adjusted cash flow. In one place, you will see which rentals truly move you toward your goals, and which ones need a new plan.

Before the decision. Not after.

Dan Ihara is a Real Estate Wealth Planner, national speaker, and co-author of Property Decisions: Avoid Painful Taxes & Family Disputes to Build a Legacy That Lasts. Over 20 years, he has guided more than 1,600 families through the property decisions that shape wealth, protect relationships, and build lasting legacies. His guiding belief: the most important real estate conversations happen before the decision — not after.

Dan Ihara

Dan Ihara is a Real Estate Wealth Planner, national speaker, and co-author of Property Decisions: Avoid Painful Taxes & Family Disputes to Build a Legacy That Lasts. Over 20 years, he has guided more than 1,600 families through the property decisions that shape wealth, protect relationships, and build lasting legacies. His guiding belief: the most important real estate conversations happen before the decision — not after.

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How to Know If Your Rental Property Is Really Making Money: The 4-Number Test Every Owner Should Run

Published on: 15/04/2026

Most rental owners track rent and hope for the best. Learn the four numbers that tell you if your property is really making money, plus the 10-minute cap rate calculation.

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