Net Passing Income Calculator
Net passing income is a property term: the rent a leased property is actually passing to its owner under the leases in place, adjusted for lease incentives. Read this page carefully, because the calculator below does not take rent inputs. It works out three equity figures from a property’s current value, its original purchase price, the mortgage balance still owing, and the cost of home improvements, and both calculations are covered honestly here: the equity tool first, then the rent formula it cannot run.
Naming warning, stated plainly: despite this page’s title, the tool takes no rent, tax or deduction inputs and cannot compute passing income. Its own copy-results text even titles the output “Net New Equity Calculator Results”. The rent-based net passing income formula is covered in its own section below so you can work it by hand.
Quick Answer
For a property now worth $650,000, bought for $400,000, with $250,000 still owing and $30,000 spent on improvements, this tool reports total current equity of $400,000, original equity of $400,000, and net new equity of $30,000. True net passing income is a different number entirely: annualized rental income minus the amortized cost of lease incentives, worked by hand in the rent section below.
- Quick Answer
- How to use this calculator, and what each field really does
- The three equity formulas the tool actually runs
- Worked example: the pre-filled property, checked line by line
- What net passing income actually means, and how to work it
- What competing calculators miss, and what this page used to claim
- Frequently asked questions
- Add This Calculator to Your Website
- References
How to use this calculator, and what each field really does
Enter the four property figures and click Calculate; the three equity outputs appear below the button. Only one field is checked, and the two quirks below change how the results should be read.
- Current property value is the anchor. Enter a defensible market value, not the price you hope for. If this field is zero, blank or non-numeric, the tool stops with the message "Please enter the current property value" and shows nothing.
- Original purchase price is subtracted in full later in the formula. There is no field for your down payment or original loan, which is the single biggest caveat on this page.
- Outstanding mortgage balance comes off the current value to give current equity. Only one balance fits; combine a second mortgage or equity line into this figure yourself.
- Home improvements cost is added at the end, at cost. Leaving a field blank counts it as zero, negative entries are not rejected and flow straight into the arithmetic, and each field quietly reformats itself to two decimal places when you click away from it.
Nothing on the page asks for rent, lease terms, taxes or deductions, because the tool never uses them. If those are the numbers you have, skip to the passing income section: the formula there takes under a minute by hand.
The three equity formulas the tool actually runs
The math is three lines long, and two of the three lines are sound. Reading them literally is the fastest way to see both the value and the defect of the headline figure.
Total current equity = current property value − outstanding mortgage balance
Original equity = original purchase price
Net new equity = total current equity − original equity + home improvements cost
The first line is the standard home equity definition, and it is correct: what the property is worth minus what is owed on it. The second line is where the tool goes wrong. Your original equity in a property is the cash you actually put in at purchase, normally the down payment, not the full purchase price. By setting original equity equal to the whole price, the tool quietly assumes you bought the property for cash. The third line then subtracts that inflated figure and adds improvement costs back at full price, so net new equity mixes three unlike things: genuine appreciation, mortgage principal you have paid down, and renovation spending valued at cost rather than at what it added to the price.
Put numbers on it. Suppose you bought for $400,000 with 20% down: $80,000 of your own money and a $320,000 loan. Years later the property is worth $650,000 and the balance is $250,000, so current equity is $400,000 and your true equity gain is $400,000 minus your $80,000 stake, which is $320,000. The tool reports net new equity of $30,000 on those same facts (with $30,000 of improvements entered), understating the gain by $290,000, almost exactly the original loan it never asked about. Use the first output freely; treat the third as an artefact of the formula, not a measure of your position. A cleaner equity build-up comes from tracking the balance itself, which is what our mortgage payment calculator breaks down payment by payment.
Worked example: the pre-filled property, checked line by line
The pre-filled values reproduce exactly in the tool. A property bought for $400,000 is now worth $650,000; $250,000 remains on the mortgage; $30,000 has been spent on improvements.
| Output | Calculation | Result |
|---|---|---|
| Total current equity | $650,000 − $250,000 | 400,000.00 |
| Original equity | purchase price, as entered | 400,000.00 |
| Net new equity | $400,000 − $400,000 + $30,000 | 30,000.00 |
Notice what the third line collapses to on these inputs: because current equity happens to equal the purchase price, net new equity is just the improvement cost. The checks below are further real runs of this calculator, verified against its code, including the case that exposes the formula: a property that rose $70,000 in value still reports a deeply negative net new equity.
| Inputs (value / price / mortgage / improvements) | Current equity | Original equity | Net new equity |
|---|---|---|---|
| $450,000 / $380,000 / $290,000 / $25,000 | 160,000.00 | 380,000.00 | -195,000.00 |
| $500,000 / $350,000 / $0 / $15,000 | 500,000.00 | 350,000.00 | 165,000.00 |
| $300,000 / $320,000 / $310,000 / $0 | -10,000.00 | 320,000.00 | -330,000.00 |
| $400,000 / blank / blank / blank | 400,000.00 | 0.00 | 400,000.00 |
What net passing income actually means, and how to work it
Net passing income is a valuation term from leased commercial and investment property. Passing rent is the contracted rent currently being paid under leases already in place, as opposed to market rent, which is what the space might achieve on a new lease. Net passing income adjusts that rent for lease incentives, the rent-free periods and landlord contributions used to secure the tenant, spread (amortized) over the lease term.
The formula is net passing income = annualized rental income − net effects of amortization of lease incentives. Annualizing simply puts the contracted rent on a yearly footing, the same convention behind annualized rent definitions in lease documents: monthly rent multiplied by 12. On the figures above, a small commercial unit passing $12,500 a month shows $150,000 of annualized rental income; a $60,000 incentive package (say a fit-out contribution plus a rent-free period) amortized over the five-year lease takes $12,000 a year off, leaving net passing income of $138,000. Valuers use that figure, not the headline rent, when they capitalize income into a value, which is why the next step for an investor is usually to run the income through our cap rate calculator. Rental income of this kind is also taxable income with its own record-keeping rules, set out in IRS Publication 527, Residential Rental Property.
Two contrasts keep the terms straight. Passing income is about rent under contract today; it says nothing about what you own. Equity is about ownership after debt; it says nothing about rent. A property can have high passing income and almost no equity (recently bought with a large loan) or large equity and no passing income at all (an owner-occupied home). If you are weighing a rental purchase itself, our buying rental property calculator starts from the purchase side, and if you are deciding whether an improvement is worth funding, compare its cost with the value it is likely to add using our home addition value calculator rather than assuming cost and value match.
Use this tool when you need
- A fast current-equity figure for a refinance, sale or net-worth check (the first output is the standard definition)
- A rough sense of how paydown and price moves have changed your position since purchase
- Numbers you will then correct by hand for your actual down payment
Do not use it when you need
- Net passing income or any rent-based figure: there is no rent input anywhere on the page
- Your true equity gain since purchase: the formula subtracts the full price, so financed purchases are understated by roughly the original loan
- A valuation: improvement costs are added at cost, and selling costs, taxes and second loans are absent
What competing calculators miss, and what this page used to claim
The honest starting point is that this page's own previous text was the worst offender found in the research. It defined net passing income as gross salary minus taxes and deductions, gave worked examples about employees and freelancers, and never mentioned the property tool sitting above it. That definition is wrong for this term, and it has been replaced.
- CalculatorUltra's net passing income calculator is the one rival that computes the real thing: annualized rental income minus the net effects of amortization of lease incentives. Its gap is scope: no equity figures, no passing-versus-market rent guidance, and a two-line explanation that leaves the incentive amortization unexplained.
- Savvy Calculator's home equity tool computes equity and an equity ratio properly, and its FAQ gives the correct treatment of improvements: fold them into the current value, do not add the cost separately. That is the opposite of what the tool on this page does, and the comparison is a fair criticism of this tool, not of Savvy's.
- Standard home equity guides (Loans101 and similar) deduct every equity-based balance, first mortgage plus home equity loans and lines of credit, from market value. This tool has a single balance field, so anyone with a second lien must combine balances by hand first, a step the guides state explicitly and this page now does too.
- Corporate-finance "net new equity" tools, including the version for share issuance, use the same three words for something unrelated: equity issued minus equity repurchased. Searchers land on the wrong concept constantly, which is exactly why this page spells out which formula its tool runs.
The winning move available here is candour plus completeness: one page that shows the equity tool's real formulas with their defect quantified, and the genuine passing income formula with a worked rent example, so both groups of searchers leave with the right number for the question they actually had.
Frequently asked questions
Net passing income is the rent a leased property is actually passing to its owner under leases already in place, adjusted for lease incentives. It equals annualized rental income minus the net effects of amortization of lease incentives, so a property passing $12,500 a month with $12,000 a year of incentive amortization has net passing income of $138,000.
No. Despite the page title, the tool has no rent, lease or incentive inputs. It takes a property value, a purchase price, a mortgage balance and an improvement cost, and returns equity figures. The rent-based net passing income formula is set out in its own section above so you can work it by hand in under a minute.
Three equity figures. Total current equity is the current property value minus the outstanding mortgage balance. Original equity is reported as the full original purchase price. Net new equity is total current equity minus original equity plus the home improvements cost, each formatted to two decimal places.
Because that is what the code does: it assigns the purchase price to original equity with no adjustment. There is no down payment or original loan field, so the figure is only correct for a cash purchase. If you financed the purchase, your real original equity was your down payment, and the tool overstates original equity by roughly the amount you borrowed.
Because the formula subtracts the full purchase price from current equity. On a property worth $450,000, bought for $380,000 with $290,000 owing and $25,000 of improvements, the tool reports net new equity of -$195,000.00 even though the property appreciated by $70,000. The negative sign is an artefact of the missing down payment, not a loss.
This tool adds them at full cost, but that is not how equity works. An improvement raises equity only if it raises the property's value, and the value added is rarely equal to the cost. Standard home equity guidance folds improvements into the current value estimate instead of adding their cost as a separate line.
Take the tool's first output, total current equity, and subtract the cash you actually put in at purchase, normally your down payment plus any cash closing costs you want to count. On the worked example's facts with a 20% down payment, that is $400,000 minus $80,000, a true gain of $320,000, instead of the $30,000 the tool's third output reports.
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References
- Internal Revenue Service. Publication 527: Residential Rental Property (Including Rental of Vacation Homes). Accessed October 22, 2026.
- Internal Revenue Service. Topic No. 415: Renting Residential and Vacation Property. Accessed October 22, 2026.
- Internal Revenue Service. Publication 551: Basis of Assets. Accessed October 22, 2026.
- Internal Revenue Service. Publication 936: Home Mortgage Interest Deduction. Accessed October 22, 2026.
- Internal Revenue Service. Publication 523: Selling Your Home. Accessed October 22, 2026.
- Law Insider. Annualized Rent: Definition in Lease and REIT Documents. Accessed October 22, 2026.
- International Valuation Standards Council. International Valuation Standards: Income Approach and Leased Property Valuation. Accessed October 22, 2026.
- Federal Housing Finance Agency. FHFA House Price Index (HPI): U.S. Home Value Trends. Accessed October 22, 2026.
- Consumer Financial Protection Bureau. Owning a Home: Tools and Resources for Homeowners. Accessed October 22, 2026.
- Legal Information Institute, Cornell Law School. Wex: Equity (Ownership Value Remaining After Debts). Accessed October 22, 2026.