How Much Money Will I Make From My Rental Property?

This is a short, simple, down-and-dirty tutorial to so you’ll know how much money your rental property will make before you buy it.

Going from simple to complicated, the first thing to understand is the 1% rule, which is easy to do in your head, and can save you the trouble of breaking out the calculator for properties that are overpriced.

1% Rule

The 1% rule is quick and easy. Monthly rent should be at least 1% of the acquisition price. The acquisition price may be a higher number than the purchase price. It’s purchase price plus the money to get the house ready to rent.


$80,000          to purchase house                plus

$20,000          remodeling                            equals

$100,000        acquisition cost.

$100,000 home should rent out for at least $1,000 a month, or it would not be a good investment.

          What is the logic behind the 1% rule?

If a house will give you 1% of the purchase price each month in rent, then it gives you 12% of the purchase price each year.   That apparently means the investment makes 12% a year!!!!


 Not so fast!!! It’s not 12%.

Here’s where things can get tricky. We haven’t deducted our expenses from the rent yet!

We’ll use another shortcut to simplify it.

The 50% Rule

According to this rule, approximately 50% of your rent will go to expenses:

Generically, these expenses are: maintenance, taxes, insurance, property manager, and vacancy losses

This means that in our now fictional example of a house that should rent for $1,000 a month, approximately $6,000 of the $12,000 you collect in rent annually is actually profit. The other $6,000 is expenses.

Which means that if a house meets the 1% rule, it doesn’t actually make 12%. Half of that (50% rule) is eaten up in costs and the house is actually making you 6%.

Rental property that meet the 1% rule will give you a return on investment of 6%.

Houses also appreciate in value, typically at the rate of inflation. It is generally agreed that inflation averages at 3% a year.

You can add another 3% a year (appreciation) to the 6% (cash flow).

So, all said and done, a rental property that meets the 1% rule will make roughly 6% cash flow and 3% appreciation, for a total of 9%. This puts it on par with what the S&P 500 will supposedly earn you historically.

So up until now, we’ve used the 1% and 50% rule, which are so easy, you can do it in your head.

But when you are about to actually buy an investment property, it is worth it to break out and dust off that calculator, do the more complicated math, and calculate your estimated capitalization rate or cap rate.

roi rental property

Cap rate

The cap rate is your return on investment on a cash real estate deal. I know many of you will not be able to do a cash deal, but I recommend you calculate your investment this way first.

Evaluate each rental property as if it were a cash deal.   That way you can separate the quality of the house investment from the quality of the loan you are getting.

Two VERY different things.

If the deal makes sense to do in cash, it’ll also make sense to do with a mortgage. You’ll just have some added costs.

Sometimes there is confusion about the difference between cap rate and return on investment (ROI) on a real estate deal.  Cap rate calculates your return on investment assuming a cash deal (no mortgage).

ROI calculates your return on investment including mortgage related expenses.

Both are useful numbers. My advice, if the house has a good cap rate and is a good purchase as a cash deal, then it’s worth buying.

At this point, you find the best way to finance the property you can.

That way you consider the rental property and the loan separately.

Here is how you figure the cap rate.

  1. Gross income from the rental property (add up how much rent you get in a year)
  1. Subtract operating expenses (this is tricky, but worth the time. Taxes, insurance, maintenance, property manager, vacancy losses)
  1. Divide the net income (after subtracting expenses) by the property’s acquisition price (ready to rent condition).

The number you get is a percentage. 2-3% would be low. 15% or higher would be awesome!

Rich on Money’s Real Numbers

Let’s use the 1% and 50% rule, and calculate the cap rate from my second rental property in Alabama.

rental property investment

I bought this property for $45,000 cash.

It was a 4 bedroom, 2 bath home that was move-in ready. This was a huge reversal from the fixer-upper/money pit that was my first property!


1% Rule on my property

According to the 1% rule, this house should rent out for $450 a month to be “worth it”. That would mean it would be an investment that cash flows about 6% a year.

Supposedly, my rental property was going to rent for about $900. Double.


50% Rule on my property

If this house rents for $900 a month, I’ll get $10,800 a year (not bad, if you consider the purchase price of the house!)

With the 50% rule, half of that gets eaten up in expenses of one kind or another. I am left with $5,400 cash flow a year.

If you divides cash flow / purchase price, you will get my approximate cap rate or ROI without doing all the heavy math.

$5,400 / $45,000 = 12%

It’s an investment that returns 12% from cash flow.

This 12% is an estimate of what the cap rate would be. You’ll get the actual cap rate by calculating more accurately your operating expenses instead of just assuming it’s half of rent.

Remember, the rental property should also appreciate at approximately 3% per year, just keeping up with inflation.

That makes it an estimated 15% investment. That’s quite a bit better than the typical S&P 500 rate that people love to compare investments to, and with much less volatility.

Capitalization Rate on my property

Even though this house was bought move-in ready (I didn’t even have to vacuum!), there are expenses that go into the acquisition cost.

Purchase price                                             $45,000

Closing costs                                                 $488

Repairs                                                            $1,060

Inspection                                                      $250

Acquisition cost                                            $46,798

We need to calculate gross income. The property rents for $925 a month.   A little bit better than I originally estimated.

$925 X 12                                                        $11,000

Next we subtract operational expenses from the gross rent.

Taxes                                                                $301

Insurance                                                       $644

Maintenance (10% of rent)                      $1100

Property manager (10% of rent)            $1100

Vacancy losses (estimate 10%)               $1100


Total operating expenses                          $4,245


Gross rents minus                                       $11,000

operating expenses                                     $4,245

Net yearly income                                        $6,755

Now divide this number by the acquisition cost for Cap rate

$6,755 / $46,798                                          14.4% Cap rate

Add 3% for appreciation (only realized when you sell the house)


Not bad at all!

Let’s see how accurate the 50% rule was in calculating what my expenses would be

I’ll divide my operational expenses by the yearly gross rents and get a percentage (hopefully close to 50%)

Operating expenses                                         $4,245

Yearly gross rents                                            $11,000

Percentage of rent going to expenses        38.6%

In this particular case, using the 50% rule is an overestimate.

Nothing wrong with overestimating expenses when deciding to buy real estate!

I could calculate this value on a few more rental properties, and then come up with a percentage more suitable for my market and situation. Maybe it’ll be closer to 40%.


As you can see, I used 10% of rents for vacancy costs. You will be able to get a good idea of what the vacancy rates are from talking to a management company or other investors in the area you are buying.

I used 10% of rents for maintenance costs. It’s probably in the 10-15% range. If the house is newer and/or newly renovated, it could be lower.

Conversely, if the house is old, or in need up much remodeling, it could be higher.

How’d you like this posts?   Your thought on evaluating rental property?  Leave a comment.

Rich on Money

So know you calculate how much you will make.  How about the actual steps to buying a house?

Check out my Complete Guide to Real Estate Investing


Prospective Tenant? When in Doubt, Just Say No!


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  1. Paul

    This post is really helpful for beginning RE investors like myself. I have always been confused by the definition of a cap rate, but your explanation about it being the ROI for an all-cash deal is very helpful.

  2. Excellent post Rich! I love how you tied the 1% Rule, 50% Rule, ROI, and inflation concept all together. I don’t think I’ve seen anyone describe these concepts so clearly. Great work!

  3. Paul

    Rich, would you still have considered the acquisition a success if you had only been able to rent for 1% of the house’s acquisition cost (say $450 for ease of calculation)? That would have provided you with $5,400 of gross income. After subtracting expenses of $2,835 ($301 for taxes, $644 for insurance and $540 each for prop mgt, vacancy and maintenance), your net yearly income would be $2,565. This would equate to a pre-appreciation cap rate of 5.5%, and a post-appreciation cap rate of 8.5%.

    • Personally, I’m shooting for at least 1.5% to be happy. 5.5% post appreciation, i feel like I should leave my money in the s&p500 and take my chances. Real estate is more work (but not a lot more) than leaving your money in index funds, so I want a higher rate of return.

  4. Terry

    Hey there, love the formula, been years since deaed in real estate but it all came back and I must say your way is a lot easier than the old way! My wife is much more settled on going into the rental business, of course she is leaving everything up to me! But your articles have put her at ease!! Thanks for the refresher course!!

    • Jump back into it. There is money to be made in any point in the cycle. I don’t wait for dips or crashes, you might wait forever.

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