A real estate investor received advice in Springfield and presented a table claiming to have calculated the rental yield. The total yield was over 5%. However, upon closer inspection, the management fees were completely omitted.

The median home price in the Springfield 22150 area is about $680,000 (Realtytrac, 2026). The monthly rent is around $2,995 (Zillow Rental Manager). The annual rental income is $35,940. Dividing by the purchase price gives a total yield of 5.29%. At first glance, this seems acceptable.

The problem starts here. Springfield is part of Fairfax County. The property tax rate for the 2026 fiscal year in this county is $1.1225 per $100 of assessed value. The effective tax rate is about 1.01%. The median annual tax bill reaches $7,669. To get the real numbers, management fees, insurance, maintenance costs, and vacancy losses must also be included.

This investor's calculation only included property taxes, leaving out management fees, insurance, and maintenance costs. Applying the 50% rule and recalculating, the net operating income is about $17,970 per year. The cap rate drops to 2.64%, which is more than half the initial 5.29% shown.

If a mortgage is involved, the gap widens further. Assuming a 25% down payment and a 30-year mortgage at an annual rate of 6.75%, the annual principal and interest payments exceed the net operating income. In this case, the cash-on-cash return turns negative. This means that missing just one management fee in the calculations can completely overturn the investment decision.

Springfield is a convenient commuting area with steady demand among Korean families. Many neighborhoods also have decent school districts. However, school district boundaries change frequently. It is advisable to check the assigned school for the specific address before purchasing.

When compared using the 1% rule, the investor's misunderstanding becomes clearer. 1% of the purchase price is $6,800 per month, but the actual rent is $2,995, which is only 0.44% of the purchase price. The omission of management fees in the initial calculation does not bridge this gap.

The net operating income will also vary depending on whether management fees are set at 8% or 12% of the rent. While managing directly reduces management costs, it requires time and effort, and outsourcing will lower the cap rate, which should be factored into the calculations from the start.

Springfield has good access to Virginia Rail Express and highways, ensuring consistent commuting demand. However, this demand can vary significantly based on the location and condition of the properties, so it is safer to check the vacancy records for specific complexes or addresses.

I placed the investor's initial calculation table alongside the recalculated one and pointed out where the differences occurred. After seeing that the cap rate dropped by more than half due to the omission of just one management fee, the investor began to understand why relying solely on total yield for investment decisions is not advisable.

The investor later reported that they started organizing their spreadsheet to update management fees, insurance, and maintenance costs monthly. Once they properly addressed this the first time, they could avoid making the same mistake when reviewing future properties.

The longer the holding period, the more cumulative the impact of such calculation errors becomes. If one only considers the first year's numbers without accounting for the gradual increase in property taxes and insurance, the actual net operating income is likely to remain lower than expected over ten years. It is essential to develop a habit of comparing actual expenses with calculated figures at least once a year.

Comparing with nearby areas clarifies the location's standing. While the total yield is relatively better than areas like Fairfax City or Bellevue, where purchase prices are much higher, it is not absolutely high. Ultimately, it remains true that total yield alone is insufficient to gauge actual profitability in any area.

Omitting just one calculation item can lead to significantly different results. It is safer to calculate total yield, cap rate, and cash-on-cash return separately, while also considering potential appreciation. This article does not constitute investment or legal advice, and it is recommended to consult a professional before making any contracts.