A year ago this past week — July 4, 2025 — the One Big Beautiful Bill became law. Buried in it was a change that most investors are only now feeling, because this spring they filed their first full tax year under the new rule: 100% bonus depreciation is permanent again. Not phasing down. Not sunsetting in 2027. Permanent.

This is the strange new normal I'm watching play out on my clients' returns. A single-family rental that puts real money in the owner's pocket every month — a property that is, by any honest definition, profitable — reports a $50,000 loss to the IRS. Same property. Same rent check clearing the same account. One number for the bank, a very different number for the tax return.

That gap is legal and intentional — it's what the code is designed to do. But it creates a problem nobody warned these investors about: the harder you lean on the tax code, the stranger your return looks to a conventional mortgage underwriter. This piece is about that tension — and the one financing product that makes it disappear.

This is educational, not tax advice. I arrange financing; I'm not your CPA or your tax attorney. Every depreciation, cost-segregation, and passive-loss move below has to be run through your own tax advisor against your actual return before you act on it. The numbers here are illustrations to show you how the pieces fit — not a promise about your situation.

How a Profitable Rental Manufactures a $50,000 Loss

Depreciation is the IRS letting you deduct the wear-and-tear on a building over time, even though you're not writing a check for it. On a residential rental, the standard schedule spreads the building's value over 27.5 years. Slow and steady.

Cost segregation speeds it up. It's an engineering-based study that walks the property and reclassifies its components by their real useful life. The carpet, cabinetry, appliances, and specialty electrical aren't the building — they're 5- and 7-year property. The driveway, fencing, and landscaping are 15-year property. Only the structure itself — foundation, roof, load-bearing walls — stays on the 27.5-year schedule. On a typical long-term residential rental, a study reclassifies roughly 15–30% of the depreciable basis into those shorter-life buckets (an analysis of 8,000-plus studies published by Overline in 2026 puts the typical band around 20–28%, with a median near 24%; furnished short-term rentals run higher on furniture and fixtures).

Here's where the One Big Beautiful Bill matters. Anything with a MACRS class life of 20 years or less — which is exactly what cost seg carves out — is now eligible for 100% first-year bonus depreciation, permanently, for property acquired and placed in service after January 19, 2025 (IRS Notice 2026-11). So instead of depreciating that reclassified 20–30% of your building over 5 to 15 years, you deduct all of it in year one.

One trap worth knowing, because it's the kind of detail that separates real advice from a sales pitch: if your property was under a written binding contract dated before January 20, 2025, the IRS treats it as acquired on that earlier date. It does not get the 100% — it falls back to the old phase-down (40% for 2025). Check your contract date with your CPA before you assume you qualify.

The study itself isn't free. Engineering-based studies typically run $5,000–$15,000, and the rule of thumb across the industry is that the fee starts to pencil once you're above roughly $250,000–$500,000 of depreciable basis. Below that, the deduction may not justify the cost. It's a "does this pencil at my basis" question, not a universal yes.

The Claim You've Read Everywhere — and Why It's Wrong

Here's the myth that's all over investor forums: "Don't take too much depreciation or you'll wreck your debt-to-income and never qualify for another mortgage."

That's mostly wrong, and getting it right is the whole game. When a conventional underwriter calculates your rental income, they don't just read the loss off your Schedule E and call it a day. They use a worksheet — Fannie Mae's Form 1038, under Selling Guide B3-3.1-08 — and that worksheet adds depreciation back. It also adds back mortgage interest, taxes, insurance, and documented HOA, then subtracts your full housing payment. Depreciation is a non-cash deduction; the worksheet knows it, and it reverses it out.

I'll prove it with real numbers in the next section. The short version: plain-vanilla depreciation, by itself, largely washes in the conventional rental-income math. Anyone telling you a cost-seg year automatically tanks your mortgage qualifying doesn't know how the worksheet works.

Run the Numbers — One Deal, Three Sets of Books

Let me trace a single property all the way through. These are stated illustration inputs — your district's taxes and your actual land split will differ, and your CPA computes the exact figures — but every number below derives from this one scenario.

The deal (assumptions):

  • $300,000 single-family long-term rental, acquired and placed in service in 2026 (no pre-1/20/25 binding contract → 100% bonus eligible)
  • Land is 20% of price → depreciable basis $240,000
  • Cost seg reclassifies 20% of basis = $48,000 into 5-/15-year property (the conservative end of every published range)
  • Market rent $2,400/mo ($28,800/yr), supported by a Form 1007 rent schedule
  • 25% down → loan $225,000, 30-year fixed at 7.00% (representative; DSCR pricing the week of July 2026 ran roughly 6.125%–7.5% depending on FICO, LTV, DSCR, and points, priced off the ~4.49% 10-year Treasury on July 7 plus spread — your rate is set at application)
  • Taxes $400/mo ($4,800/yr), insurance $125/mo ($1,500/yr), other operating costs $2,900/yr

The derived numbers:

  • P&I on $225,000 at 7.00% over 30 years = $1,497/mo ($17,963/yr)
  • PITIA = $2,022/mo ($1,497 + $400 + $125)
  • Year-one mortgage interest ≈ $15,680 (principal ≈ $2,285)
  • Year-one depreciation: $48,000 bonus + straight-line on the remaining $192,000 ÷ 27.5 ≈ $6,982 = ≈ $54,982 (this illustration ignores the mid-month convention on the 27.5-year portion; the study and your CPA compute the exact figure)

Now watch the same property produce three completely different numbers.

What actually hits your bank account: $28,800 rent − $17,963 P&I − $4,800 taxes − $1,500 insurance − $2,900 operating = +$1,637/yr (about +$136/mo). The property makes money.

What the IRS sees (Schedule E): $28,800 − $15,680 interest − $4,800 − $1,500 − $2,900 − $54,982 depreciation = −$51,062 paper loss. At a 32% marginal rate, that loss is worth roughly $16,300 in federal tax — if the passive-loss rules let you use it this year (more on that gate below; it's real, and it's not a footnote).

What Fannie's worksheet sees (Form 1038, done correctly): −$51,062 + $54,982 depreciation + $15,680 interest + $4,800 taxes + $1,500 insurance = $25,900/yr = $2,158/mo. Subtract the $2,022 PITIA → +$136/mo qualifying income.

Look at what just happened. The add-backs reconstruct the real cash flow almost exactly: +$136 qualifying = +$136 actual. The worksheet works. The $51,062 loss did not destroy the file.

What the IRS sees What Fannie's worksheet sees What a DSCR lender sees
−$51,062 paper loss +$136/mo qualifying income DSCR 1.19

Same property. Three books, all correct.

Where the Conventional File Actually Breaks

So if the worksheet handles the depreciation, why do I keep watching write-off-heavy investors get bounced from conventional financing? Because the loss isn't the problem — the file around it is. The +$136 qualifying number only survives if five things all go right:

  1. You have two years of returns, and an underwriter executes the worksheet correctly. New acquisition with no history? Then you're on the lease method, and Fannie counts only 75% of gross rent — a 25% haircut for vacancy and expenses that can push a thin deal underwater before your real numbers ever get considered.
  2. Your passive-loss carryovers don't trigger special adjustments. Selling Guide B3-3.6-05 tells underwriters to pay particular attention to passive-loss limitations and prior-year carryovers. A big cost-seg year hands a human underwriter a judgment call on your file — and judgment calls don't always break your way.
  3. The property isn't buried in an entity return. Hold rentals in an LLC or partnership and you're on Form 8825 and K-1s, which pulls business returns and liquidity documentation into the underwrite.
  4. Your other paper losses don't drag your qualifying income. A self-employed borrower's return is a stack of write-offs. Even when the rental math survives the worksheet, the rest of the 1040 can sink the DTI.
  5. You're under 10 financed properties. This is the wall nothing gets you around. Fannie's B2-2-03 (updated 11/05/2025) caps you at 10 financed 1–4-unit properties for second-home and investment loans, with reserve requirements that escalate as you climb — roughly 2% of the aggregate unpaid balance on your other financed properties at 1–4 properties, 4% at 5–6, and 6% at 7–10 (B3-4.1-01). The cleanest returns in the world don't move that ceiling.

That's five "whens." Every one of them is a place I've watched a good deal die — not because the property was bad, but because the borrower's tax strategy and the conventional underwriting box were pulling in opposite directions.

The DSCR Resolution

Now the same deal through a DSCR lender.

Qualification is one division: gross rent ÷ PITIA. $2,400 ÷ $2,022 = DSCR 1.19. One appraisal with a rent schedule, and the property clears. No tax returns, no DTI, no property-count cap, standard LLC vesting — the mechanics I walk through in the DSCR loan complete guide. The −$51,062 never enters the room — because the room doesn't have a chair for it.

That's the strategic point, and it's bigger than any single closing. On a DSCR loan, your write-offs and your leverage stop fighting each other. Your CPA maximizes every deduction the code allows — cost seg, bonus depreciation, the works — to shrink your tax bill. Your lender, meanwhile, never reads any of it, because the property qualifies on its own rent. For the first time, the guy minimizing your taxable income and the guy deciding whether to lend you money aren't looking at the same page and reaching opposite conclusions.

This is the same engine behind scaling past the 10-property wall and the reason DSCR keeps beating conventional for investors who file the way their CPA tells them to — a thread I ran through in DSCR loan vs. conventional mortgage.

The Honest Ledger

I won't sell you the upside without the costs. Here's what has to sit next to the tax savings:

Bonus depreciation is deferral, not free money. When you sell, you settle up. The accelerated depreciation on your 5-, 7-, and 15-year cost-seg components is Section 1245 property, recaptured at ordinary income rates — not the friendly capital-gains rate. The straight-line depreciation on the building itself is unrecaptured Section 1250 gain, taxed up to 25%. Don't let anyone hand you the sloppy "recapture is 25%" line — the cost-seg portion is ordinary-rate. A 1031 exchange defers both if you roll into another property.

Many W-2 investors can't use the loss this year. Rental losses are passive by default (IRC §469, IRS Pub 925). They offset passive income, not your W-2 wages — unless you qualify as a real estate professional (750-plus hours and material participation), run the property as a short-term rental (average stay of 7 days or less, with material participation), or fit the $25,000 active-participant allowance, which itself phases out between $100,000 and $150,000 of income. If none of those fit you, the loss isn't wasted — it's suspended, carried forward indefinitely, and released when you sell. Still valuable. Just timed differently than the year-one headline suggests. Your CPA confirms whether you can use it this year.

Several states decouple from federal bonus depreciation — your CPA confirms how your state treats it. I won't guess at your state's conformity here.

DSCR pricing runs above best-case conventional. You're paying a spread for the simplicity and the scalability — name it and decide if it's worth it. For an investor who genuinely qualifies conventionally with clean returns, it may not be. For one who's scaling, or self-employed, or actually using the losses, it usually is.

Who This Is For — and Who It Isn't

This is for you if: you're self-employed and your return is built to minimize income; you're scaling past a handful of doors and eyeing the 10-property ceiling; or you run short-term rentals or qualify as a real estate professional and are genuinely using the passive losses. For you, cost seg plus a DSCR loan is a clean fit — deduct everything, borrow against the property, no collision.

This isn't for you if: you're a W-2 earner buying door number one with two years of clean returns and a DTI with room to spare. Conventional may well price better, and the worksheet will treat your depreciation just fine. I'll tell you that to your face rather than sell you a product you don't need.

Run Your Next Deal Both Ways

Before you order a cost seg study, run your next acquisition both ways: what does it look like as a conventional file, and what does it look like as a DSCR file? Half the time the answer is obvious once the numbers are on the table — and it's a lot cheaper to find out before the study than after.

Send me the property details — price, rent, taxes, insurance, and how you file — and I'll run the DSCR, tell you the rate tier you're in, and give you a straight read on whether conventional or DSCR fits your situation better. No application, no commitment, just the math. Then take it to your CPA and make the tax call with real financing numbers in hand.

Educational only — not tax, legal, or investment advice. Bonus depreciation, cost segregation, passive-loss usage, and recapture all turn on facts specific to your return and your state. Confirm every strategy here with your own CPA or tax attorney before acting. Loans are for business purposes only.

FAQ

Does depreciation hurt my ability to get a conventional mortgage on a rental? Mostly no — on the rental-income calculation itself. Fannie Mae's worksheet (Form 1038, per Selling Guide B3-3.1-08) adds depreciation, mortgage interest, taxes, and insurance back to your Schedule E result before subtracting the housing payment, so plain-vanilla depreciation largely washes out. Where a write-off-heavy file actually breaks is elsewhere: passive-loss carryover adjustments the underwriter has to make (B3-3.6-05), entity returns and K-1s, the 25% haircut on lease income for new acquisitions, other reported losses dragging your qualifying income, and the hard cap of 10 financed properties (B2-2-03). A DSCR loan sidesteps that entire analysis — it qualifies on the property's rent versus its payment, and never opens your return.

What is 100% bonus depreciation after the One Big Beautiful Bill? The One Big Beautiful Bill, signed July 4, 2025, made 100% first-year (bonus) depreciation permanent for qualified property with a MACRS class life of 20 years or less — acquired and placed in service after January 19, 2025 (IRS Notice 2026-11). A cost segregation study is what carves the 5-, 7-, and 15-year components out of a building so they qualify. Property under a written binding contract dated before January 20, 2025 is treated as acquired on that earlier date and does not get the 100% — it falls to the old phase-down. Confirm your acquisition date and eligibility with your CPA.

Do DSCR lenders look at my tax returns? No. A DSCR loan qualifies on the property's income versus its full payment (principal, interest, taxes, insurance, and any HOA) — not on your personal income, your debt-to-income ratio, or your tax returns. Whatever paper loss cost segregation and bonus depreciation produce on your 1040 never enters the underwriting file.

Do I pay the depreciation back when I sell? In part — this is deferral, not free money. On sale, the accelerated depreciation taken on 5-, 7-, and 15-year cost-seg components is Section 1245 property, recaptured at ordinary income rates. Straight-line depreciation on the building itself is unrecaptured Section 1250 gain, taxed at up to 25%. A 1031 exchange can defer both. Your CPA computes the actual recapture on your specific sale — plan for it before you order the study.

Get Straight Numbers on Your Deal

If your CPA just introduced you to cost segregation on your 2025 return and you're wondering what it does to your ability to keep borrowing — that's the exact question I answer all day. Send the property numbers and how you file. I'll tell you what the DSCR comes out to, what it would take conventionally, and which one actually fits. If conventional is the better deal, I'll say so and point you to someone who can close it.

Dominick Prevete — 31 years in real estate finance. Founder, National Loan Provider. 25 Main Street, Unit B, Sparta NJ.

Run your deal both ways →