Get a complete rental property profit and loss statement in one screen — rent income against every real operating cost, with annual cash flow included.
Ask a landlord what their rental brings in and you'll get the rent figure, instantly, to the dollar. Ask what it nets and you'll get a pause. That pause is where $600 to $1,200 a month hides on a typical single-family rental — quietly bled out by property tax, insurance, the vacancy you don't budget for, the water heater you didn't reserve for, and a management fee if you don't self-manage. It stays invisible until someone runs the math, and most owners never do. This tool builds the full P&L. You enter each expense category against the monthly rent and it calculates your monthly cash flow, total expense ratio, annual P&L, and a monthly average breakdown.
The goal is to stop running the property in your head and start running it on paper. An owner who knows their exact monthly net cash flow makes better decisions — about rent increases, repair investments, capital expenditures, and whether adding a second property makes sense. An owner operating from a rough sense of 'rent minus mortgage' is flying with limited instruments.
The expense categories most landlords undercount
Mortgage Payment — principal and interest — is loaded first. Most landlords have this number memorized. Property Tax (monthly) and Insurance (monthly) come next, and these are where the first surprises usually appear. Annual property taxes on a $280,000 rental at a 1.8% effective rate are $5,040 — $420/month. Annual landlord insurance typically runs $1,200–2,000 — another $100–167/month. Add those two to the PI payment and you are already $520–590 above the mortgage line before a single repair happens.
Maintenance Reserve is where most new landlords get hurt. The conventional rule — budget 1–2% of the property's value annually for repairs and replacements — translates to $2,800–5,600/year on a $280,000 home, or $233–467/month. Skipping this line does not make it zero; it just turns future repairs into emergencies. Roofs, water heaters, HVAC systems, and appliances all eventually need replacement, and they do not wait for a month when cash flow is comfortable.
Vacancy reserve: planning for empty months
Vacancy Reserve % — typically 5–8% for a well-managed single-family or small multifamily rental — accounts for the months when a unit sits empty between tenants. A rental generating $1,800/month at 7% vacancy reserve is effectively netting $1,674/month in expected rental income over the course of a year because one month in fourteen will likely be vacant.
New landlords who model at 0% vacancy tend to be shocked by their first turnover. Cleaning, repainting, and re-renting a unit typically takes two to four weeks, and in competitive markets it can extend to six. Setting a realistic vacancy reserve in the model does not guarantee that vacancy will occur — it just builds the expected cost of vacancy into the annual cash flow projection so you are not surprised when it does.
Property management: what the fee actually costs
Property Management % — typically 8–12% for single-family rentals, 6–10% for larger multi-family — is one of the most significant expense variables for landlords who do not self-manage. On a $1,800/month rental, a 10% management fee is $180/month — $2,160 per year. Over a 30-year hold, that is $64,800 if rent never increases. Most landlords who self-manage are implicitly taking that $180/month as compensation for their time.
Whether that trade-off is worth it depends entirely on the landlord. The calculator lets you toggle the management percentage between 0% (self-managed) and a realistic market rate to see the net cash flow difference. If professional management costs $180/month but eliminates 5 hours of landlord time monthly, the implicit hourly rate is $36 — the owner should decide whether their time is worth more or less than that elsewhere.
Total expense ratio: the real picture of property efficiency
Total Expense Ratio — all monthly expenses divided by monthly rent — is a useful benchmark for evaluating how efficiently a property runs. A total expense ratio of 55% means $0.55 of every rent dollar goes to expenses before the owner keeps anything. Ratios below 45% indicate a well-capitalized, low-overhead property; ratios above 70% suggest the rent is too low relative to costs, expenses are out of control, or the property has a structural problem with its cost base.
Experienced real estate investors use this metric to compare properties on equal footing regardless of size. A $2,400/month rental with a 48% expense ratio produces $1,248/month cash flow. A $1,600/month rental with a 38% ratio produces $992/month. The higher-rent property wins — but that comparison shifts entirely if the property taxes or maintenance burden change the expense ratio.
Annual cash flow and the long-hold calculation
Annual Cash Flow — twelve times your monthly net — is the number that matters for long-term rental investment analysis. A property generating $340/month cash flow produces $4,080/year. Against a down payment of $56,000 (20% of a $280,000 purchase), that is a 7.3% cash-on-cash return. Whether that is good depends on alternative uses for that $56,000 and what appreciation, principal paydown, and tax benefits add to total return.
The annual P&L output also makes rent increase decisions concrete. Raising rent $100/month on this property adds $1,200/year to cash flow, improving cash-on-cash return from 7.3% to 9.4%. If the market supports the increase and you are not at risk of losing a good tenant, the calculator shows you the year-one gain from making it. Landlords who avoid rent increases to preserve goodwill rarely realize how much they cost themselves over five and ten years.
How to use it
- Enter Property Name to track multiple properties if you run the tool more than once.
- Enter Monthly Rent — the actual rent currently charged, not the market rate.
- Fill in Mortgage Payment (P&I), Property Tax (monthly), and Insurance (monthly) from your actual bills.
- Set Maintenance Reserve (monthly) to 1–2% of property value divided by 12 — or your actual trailing average.
- Enter Vacancy Reserve %, Property Management %, and Other Monthly Costs, then read Monthly Cash Flow, Total Expense Ratio, and Annual Cash Flow.
Who it's for
- First-time landlord evaluating their first rental — A new owner renting a $1,650/month unit builds the full expense model and discovers their actual monthly cash flow is $210 after all real costs — lower than expected but enough to justify the hold given appreciation.
- Experienced landlord deciding whether to raise rent — An owner with a long-term tenant models the annual cash flow difference between a $125 rent increase and no increase — sees $1,500 in annual difference and decides whether the relationship risk is worth it.
- Portfolio landlord comparing two properties — An investor with two properties runs each through the calculator and identifies that Property B has a 12-point higher expense ratio due to older HVAC and high maintenance reserves — a capital improvement case to present.
- Owner evaluating self-management versus hiring a PM — A self-managing landlord models the 9% property management fee on their $1,900/month rental and sees exactly how much monthly cash flow they would give up — then decides whether the time savings justifies the $171/month cost.
Key terms
- Cash flow
- Monthly rent collected minus all operating expenses. The actual dollars that flow to the landlord each month after all costs are paid.
- Total expense ratio
- Total monthly expenses divided by monthly rent. A benchmarking metric for comparing property efficiency — lower ratios indicate a greater share of rent reaching the owner.
- Maintenance reserve
- A monthly amount set aside for future repairs and capital replacements. Standard guidance is 1–2% of property value annually, reserved monthly to smooth out irregular large-ticket costs.
- Cash-on-cash return
- Annual cash flow divided by total cash invested (typically the down payment and closing costs). A common metric for evaluating rental property investment performance independent of leverage.
Frequently asked questions
What should I enter for Maintenance Reserve if I do not know my property's value?
Use 1.5% of an estimated market value divided by 12 as a starting point. If the property is newer construction (under 10 years old), 1% may be reasonable. Older properties, especially those with aging roofs, plumbing, or HVAC, should be modeled at 2% or higher. The key is to use a number that reflects real expected costs, not zero.
Should I include principal paydown in my cash flow calculation?
The calculator tracks cash flow — actual dollars flowing in and out. Principal paydown is a form of equity building, but it is not cash in hand. Most landlords find it useful to track cash flow separately from equity accumulation and total return. This tool focuses on cash flow; the net worth tracker or investment ROI tools are better suited for total return analysis.
What counts as Other Monthly Costs?
HOA fees if applicable, water/sewer/trash if landlord-paid, lawn care or snow removal, pest control, and any other recurring costs not captured in the dedicated fields. For properties where you pay utilities, include your typical monthly bill here.
How do I handle a property where rent varies month to month, such as a short-term rental?
Use your trailing 12-month average rent as the Monthly Rent input and run the fixed expenses at their actual monthly amounts. For seasonally variable short-term rentals, the STR vs LTR Comparison tool provides a better framework than this one. Enter your rental's real numbers now and see the monthly cash flow, expense ratio, and annual P&L in one screen — free to use, no account required.