After-Tax Cash Flow Calculator for Real Estate Investors

Turn a property's net operating income into before-tax and after-tax cash flow in one step. Enter the purchase price, down payment, closing costs, rehab, annual gross rent, annual operating expenses, loan terms, your marginal tax rate, whether the property is residential or commercial, the building's share of value, and the month it is placed in service. The calculator returns debt service, before-tax cash flow, year-one depreciation, taxable income, tax impact, after-tax cash flow, cash-on-cash return on total cash invested, cap rate, debt coverage ratio, and operating margin.

This tool uses the classic real estate pro-forma that lenders and analysts use for any income property. For a detailed single-family rental model with vacancy, management, and CapEx as separate lines, use the rental property after-tax cash flow calculator instead. The formulas are explained in depth in calculating after-tax cash flow.

The after-tax cash flow formula

After-tax cash flow (ATCF) starts from NOI and works down two parallel tracks: one for cash, one for tax.

Cash track

• NOI = gross rental income − operating expenses
• Before-tax cash flow (BTCF) = NOI − annual debt service (principal + interest)

Tax track

• Taxable income = NOI − mortgage interest − depreciation
• Tax = taxable income × marginal rate (negative tax means a saving)

Result

• ATCF = BTCF − tax

The two tracks differ by exactly two items: principal (in the cash track, not deductible) and depreciation (in the tax track, not a cash cost). Everything else matches.

The results are estimates for informational purposes only. They describe year one and use a single marginal rate, as described below.

Worked example: the default inputs

Inputs: price $400,000; down payment $80,000; no closing costs or rehab; gross rental income $48,000 a year; operating expenses $15,000 a year; 6.5% for 30 years; 24% marginal rate; residential; 80% building; placed in service in January; straight-line.

Related metrics on the same inputs:

Depreciation and interest absorb almost all of the $33,000 NOI, so only $1,154 is taxable even though $8,729 of cash comes in. That is the main reason income property is described as tax-sheltered. Year-one depreciation is slightly less than a full year ($11,636.36) because of the mid-month convention: a building placed in service in January is treated as in service from the middle of that month.

Closing costs, rehab, and the building share

Three inputs change both sides of the analysis.

• Closing costs that are added to basis (title, recording, transfer taxes, not loan fees) raise the depreciable basis by the building share and raise the cash you invested.
• Rehab before renting is capitalized: it is depreciated with the building rather than deducted, and it also counts as cash invested.
• The building share is the part of price and closing costs that is not land. Use your county assessor's ratio or an appraisal.

Add $8,000 of closing costs and $12,000 of rehab to the default example. The depreciable basis becomes ($400,000 + $8,000) × 80% + $12,000 = $338,400, year-one depreciation rises to $11,792.73, taxable income falls to $512.58, and ATCF rises to $8,605.57. But cash invested is now $100,000, so after-tax cash-on-cash drops from 10.56% to 8.61%. Leaving those costs out of the denominator would overstate the return by almost two points.

Lowering the building share works the other way. At 75% the default property's year-one depreciation is $10,454.55 and ATCF is $8,284.40; at 70% it is $9,757.58 and $8,117.13. Each 5 points of building share is worth about $167 of ATCF a year at 24%.

Residential vs. commercial: 27.5 vs. 39 years

Residential rental buildings are depreciated straight-line over 27.5 years, per IRS Publication 527. Nonresidential real property — offices, retail, warehouses — uses 39 years under MACRS, as set out in IRS Publication 946. Both use the mid-month convention. Switching the default example to "Commercial Property":

Same rent, same expenses, same loan: the commercial building keeps $789 less a year because it shelters less income. When you compare a small apartment building with a small retail strip at the same cap rate, this difference belongs in the comparison.

The cost segregation estimate

A cost segregation study splits a building into components. Carpet, appliances, cabinetry and some electrical work can be 5- or 7-year property, and parking lots, fencing and landscaping 15-year property. Property acquired after January 19, 2025 qualifies for permanent 100% bonus depreciation under the One Big Beautiful Bill Act, so those components can be written off in year one (IRS Notice 2026-11).

Choose "Cost segregation + 100% bonus (estimate)" and enter the share of basis you expect to be reclassified; the default is 20%. On the default property, 20% of $320,000 is $64,000 of bonus depreciation, plus $8,921.21 on the remaining 80% of the building, for $72,921.21 in year one. Taxable income becomes a $60,615.90 loss and, if the whole loss were usable, the 24% tax saving would lift ATCF to $23,276.40.

Two cautions. First, the share is your assumption until a study is done; studies cost money and the reclassified share varies widely by property. Second, a $60,616 loss is far above the $25,000 passive loss allowance, and most investors cannot use it right away (see below). The calculator flags this whenever taxable income is negative. Bonus depreciation also increases the depreciation recaptured when you sell.

What the calculator assumes

• Year-one figures. Interest comes from the first 12 months of the amortization schedule and depreciation from the mid-month convention, so later years differ (see the five-year table).
• Every loss is deductible. The tax saving on a loss assumes you can use it. Rental losses are passive; see the passive loss note below.
• One flat tax rate. No state tax, no NIIT, no bracket changes.
• Operating expenses are all deductible. If your expense figure includes a capital reserve, take it out for the tax view; reserves are not deductible until spent and are usually capitalized.

How after-tax cash flow changes over five years

Using the default property with rent growing 3% a year and expenses growing 2% a year. Year one has the mid-month depreciation of $11,152; later years have the full $11,636:

Five-year cumulative ATCF is $51,060, and the loan balance falls from $320,000 to $299,555, adding $20,445 of equity that never shows up in cash flow. Taxable income grows more than fivefold because interest falls while depreciation stays fixed at $11,636. Tax is still small, but the shelter is clearly wearing off.

How leverage changes the answer

Same property and rate, different down payments:

More equity raises dollar cash flow but lowers the percentage return, because the property's 8.25% cap rate is only modestly above the 6.5% loan rate. When the cap rate falls below the loan rate, the effect flips: borrowing more reduces the percentage return.

When a higher rate creates a tax loss

Change only the interest rate in the default example, from 6.5% to 7.5%:

• Monthly payment rises to $2,237.49; debt service to $26,849.84
• BTCF falls to $33,000 − $26,849.84 = $6,150.16
• Year-one interest rises to $23,899.97
• Taxable income: $33,000 − $23,899.97 − $11,151.52 = −$2,051.48
• Tax at 24%: −$492.36 (a saving, if the loss is usable)
• ATCF: $6,150.16 + $492.36 = $6,642.52
• Debt coverage ratio drops to 1.23

A one-point rate increase costs $2,578 of before-tax cash flow, but only $1,809 after tax, because the extra interest is deductible. That cushioning effect is real only when you can deduct the loss, which brings the passive loss rules into play.

Reading the result: four checks

1. Debt coverage ratio comfortably above 1.0. Below 1.0, NOI does not cover the mortgage. Commercial and DSCR lenders set their own minimums above that, so ask for the figure in writing; at 1.36 the default deal leaves a cushion.
2. Taxable income near zero is normal early on. If taxable income is a large negative number, confirm you can use the loss (below).
3. Compare ATCF with BTCF. A big gap in your favor means the deal is leaning on depreciation, which will be recaptured at sale.
4. Watch operating margin. Residential properties with landlord-paid utilities and management often run lower margins than the 68.75% in the example; an unrealistically high margin usually means expenses are missing.

Passive loss limits and recapture

Rental losses are passive. Under IRS Publication 925, up to $25,000 of loss from rentals you actively participate in can offset other income if your modified AGI is $100,000 or less. The allowance shrinks by 50 cents per dollar of MAGI above $100,000 and is gone at $150,000, unless you qualify as a real estate professional. Losses you cannot use carry forward and are generally released when you sell. This calculator does not ask for your MAGI, so if it shows a tax saving on a loss, check that saving against your allowance; the rental property after-tax cash flow calculator applies the phase-out for you.

When you do sell, the depreciation you took (or were allowed to take) reduces your basis. That portion of the gain is unrecaptured section 1250 gain, taxed at a maximum of 25% according to IRS Topic 409. After five years of the default schedule, that is $57,697 of depreciation and up to $14,424 of tax at sale. Model the exit with the real estate capital gains tax calculator, or defer it with the 1031 exchange tax calculator.

Where to go next

For a single-family rental with separate vacancy, management, and reserve lines, the step-by-step rental after-tax cash flow guide explains each deduction and the passive loss phase-out with three investor profiles. For pre-tax screening metrics, use the rental property ROI calculator.