Following the case of a family that purchased a townhouse in Annandale and rented it out, the confusion between net operating income and total returns becomes clear. They initially judged the investment to be good based solely on the cap rate, but later realized they had not separately calculated the total returns, which included loan repayments and market fluctuations, leading to issues.

Looking at the rental market in Annandale, the average rent as of August 2026 is $2,242 (RentCafe). At the same time, the median home value is around $678,900 (Ownwell, as of April 13), and the effective property tax rate is 1.16%, which translates to over $8,000 in annual taxes for the county.

The total return rate, calculated by dividing the annual rental income of $26,904 by the purchase price, is 3.96%. If we apply the 50% rule, the net operating income is set at $13,452, which brings the cap rate down to 1.98%. This was the initial figure the family saw, but the issue did not end there.

With a 25% down payment and closing costs, the actual investment amount is around $190,000, and if they borrow the rest at an interest rate in the 7% range, the annual repayment amount significantly exceeds the net operating income, resulting in a cash-on-cash return that is in double-digit negatives. In high purchase price areas like Fairfax County, this means that just looking at cash flow can be burdensome in the initial years.

One concept that is easy to overlook is total returns. Even if cash flow is negative at the moment, the principal on the loan is gradually being repaid each month, building equity, and when combined with capital appreciation, the overall picture can change. In this case, the family shifted their strategy to long-term holding and actual residence, based on the stable demand in the Fairfax County school district that Annandale belongs to, which they might have missed if they had only judged based on rental income.

Annandale is a densely populated area near Washington DC, where demand for actual residence is steady due to the school district and convenience of living. If approached purely as a rental investment, the cap rate being below 2% suggests that it is more realistic to focus on long-term appreciation and asset growth rather than cash flow. It is advisable to refer to ratings from GreatSchools or the Virginia Department of Education, but be sure to check the assigned school before purchasing.

The difference between judging solely based on the cap rate and recalculating with the total returns concept was significant. While a cap rate of 1.98% may seem unattractive for investment, when factoring in principal repayment, capital appreciation, and stability from actual residence, the criteria for judgment change. This case reaffirms that pure rental investment and actual residence combined with investment are fundamentally different comparisons.

In areas like Annandale, where purchase prices have already risen to the upper $600,000s, judging profitability based solely on cash flow will likely result in negative returns. Therefore, when looking at properties in such areas, it is essential to clearly define whether the purpose is investment or actual residence from the start, as this will be the starting point for calculations.

Annandale has good accessibility to downtown Washington DC and a well-established Korean business community, so rental demand remains steady. However, it is also important to note that this location premium is already significantly reflected in the purchase price. If the goal is purely investment, it is helpful to compare with neighborhoods within Fairfax County that have relatively lower purchase prices and decide in advance whether to prioritize cap rate or convenience of living. Ultimately, as in this case, it is necessary to emphasize the importance of making decisions based on total returns and purpose rather than relying solely on the cap rate.

Property taxes and rental conditions may vary depending on the county and individual circumstances, and there is no guaranteed calculation method for investment returns. This article does not constitute investment or legal advice, and it is recommended to consult with a professional before entering into any actual contracts.