Rental Property Cash Flow: A Northern Virginia Example, Line by Line

Rental property cash flow is what is left each year after you collect rent and pay every cost of owning the property, including the mortgage. In Northern Virginia, where purchase prices are high relative to rents, many financed rentals produce little or negative cash flow at first, even when they are good long-term investments. The example below walks through a hypothetical townhouse line by line so you can see exactly where the money goes and which assumptions move the result.

The formula, in plain English

1. Gross scheduled rent: monthly rent times 12.
2. Minus vacancy and credit loss: the weeks a unit sits empty between tenants, plus any rent you cannot collect.
3. Equals effective gross income.
4. Minus operating expenses: real estate taxes, insurance, HOA or condo dues, property management, leasing fees, repairs and a reserve for big replacements.
5. Equals net operating income (NOI). NOI divided by price is the cap rate.
6. Minus annual mortgage principal and interest (debt service).
7. Equals before-tax cash flow.

Our investment deal analysis tool follows this same structure, so you can plug in your own figures as you read.

The property and assumptions

Every number below is illustrative, chosen to be plausible for a three-bedroom townhouse in an outer Northern Virginia suburb. They are not a quote, an appraisal or a promise about any specific property.

• Purchase price: $450,000
• Down payment: 25% ($112,500), loan of $337,500
• Interest rate: 7.0% on a 30-year fixed investor loan (investment property rates usually run above owner-occupied rates; check Freddie Mac’s weekly survey and your lender for current pricing)
• Rent: $2,900 per month
• Real estate taxes: 1.1% of value, a stand-in for the combined rate in your jurisdiction (look up the real rate and assessment on your county’s tax site, such as Fairfax County’s)
• HOA dues: $100 per month
• Property manager: 8% of collected rent plus a leasing fee of half a month’s rent each year

The example, line by line

Line item (illustrative, annual)	Amount	Notes
Gross scheduled rent	$34,800	$2,900 x 12
Vacancy and credit loss (5%)	minus $1,740	About 2.5 weeks a year
Effective gross income	$33,060
Real estate taxes	minus $4,950	1.1% of $450,000
Landlord insurance	minus $1,200	Dwelling policy, not a homeowners policy
HOA dues	minus $1,200	$100 x 12
Property management (8%)	minus $2,645	Of collected rent
Leasing fee	minus $1,450	Half a month’s rent
Repairs and maintenance (5% of rent)	minus $1,740	Plumbing calls, appliance fixes, turnover paint
Capital reserve (5% of rent)	minus $1,740	Roof, HVAC, water heater, flooring over time
Total operating expenses	minus $14,925
Net operating income	$18,135	Cap rate of about 4.0%
Mortgage principal and interest	minus $26,945	About $2,245 a month
Before-tax cash flow	minus $8,810	About $734 a month out of pocket

That negative number surprises a lot of first-time investors, but it is the honest math for many financed Northern Virginia rentals. The rent covers every operating cost and most of the mortgage, and the owner covers the rest.

Why people still buy: the rest of the return

Cash flow is only one piece. Here is what else happens in year one of this example:

• Principal paydown: roughly $3,400 of the year’s mortgage payments reduce the loan balance. That is equity, but not cash in hand.
• Depreciation: under IRS Publication 527, the building (not the land) of a residential rental is depreciated over 27.5 years. If $330,000 of this purchase were allocated to the building, that would be about $12,000 a year of deductions, which can offset the rental income on paper. Passive loss limits and recapture at sale apply, so talk with a CPA.
• Appreciation: if the property rises in value, that gain comes at sale. It is not guaranteed, and it is not cash flow.
• Rent growth: if rent rises over time while the fixed mortgage payment stays the same, cash flow improves.

What changes the math

Same property, same rent, different choices. Each row changes one assumption from the base case.

Scenario (illustrative)	Monthly cash flow	What changed
Base case	About minus $734	25% down, 7.0%, professionally managed
Self-managed	About minus $393	No management or leasing fees, more of your time
Rate of 6.0% instead of 7.0%	About minus $512	Lower payment, same everything else
40% down instead of 25%	About minus $285	Smaller loan, much more cash tied up
All cash	About plus $1,511	No mortgage; a 4.0% cap rate on $450,000

Notice that even the all-cash version earns about 4% on the money invested before appreciation. Compare that with what the same cash could earn elsewhere before you decide. If you are weighing a smaller first step, my posts on house hacking and furnished vs. unfurnished rentals explore alternatives, and my property manager guide helps you decide whether to self-manage.

Common mistakes in rental cash flow estimates

• Leaving out vacancy because the current tenant is staying.
• Using the seller’s old tax bill instead of the assessment and rate that will apply going forward.
• Skipping a capital reserve. A roof or HVAC system will need replacing eventually.
• Using an owner-occupied interest rate for an investment loan.
• Ignoring HOA rules on leasing caps, registration fees or minimum lease terms.
• Counting principal paydown and appreciation as if they were monthly income.
• Assuming rent from an online estimate without checking recent leases of similar homes.

Frequently asked questions

Do rental properties in Northern Virginia cash flow?

Some do, especially when bought with a large down payment or at a favorable price, but many financed rentals here show little or negative cash flow at first. Investors often rely on appreciation, principal paydown and tax benefits for the rest of the return.

What is a good cap rate for a rental in Northern Virginia?

There is no single right number, and cap rates here tend to be low compared with many other markets because prices are high relative to rents. Compare the cap rate with your financing cost and other investment options.

How much should I budget for repairs on a rental property?

A common planning approach is to set aside a percentage of rent for routine repairs plus a separate reserve for big-ticket replacements. Older homes and systems near the end of their life need more.

Is negative cash flow ever acceptable on a rental?

Some investors accept it when they expect appreciation and can comfortably cover the gap for years. It is a personal financial decision, so review it with a CPA or financial advisor.