New-build SFR in Austin metro: builder buydown to 5.15%, but 2.7% taxes and negative

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New-build SFR in Austin metro: builder buydown to 5.15%, but 2.7% taxes and negative

Ronak Jain
Member since 2025 · 2 posts · 5 votes

First rental purchase. I've underwritten this to death and keep landing on "no," but the financing is unusually good and I want a sanity check from people who've actually done this in a Sunbelt market.

TL;DR — New-build 4 bed / 2 bath SFR in an Austin-metro exurb. Builder is at $272,999 with a 5.15% 30-yr fixed buydown (market investor rate is 7.3%+) plus a 2% closing credit. Great financing — but property taxes are 2.726% (there's a MUD in there), HOA is $119/mo, and 4-bed rents locally are $2,185 and falling 4% YoY. Assuming I pass the ~$70 internet portion through to the tenant, that shakes out to −$131/mo self-managed, −$299/mo with a property manager, a 4.24% cap rate and a 1.07 lender DSCR. My breakeven price is about $252K — a $21K gap to what they'll accept.

The question I'm stuck on: is a genuinely below-market, 30-year-fixed rate a good enough reason to buy at an above-market price? Or am I just paying the premium in a different envelope?

The property

  • Market: Hutto, TX — Austin MSA exurb, Williamson County, ~25 min NE of downtown Austin
  • Type: New construction SFR, 2026 completion, national production builder
  • Specs: 4 bed / 2 full bath (no half), two-story, 1,897 sqft, 0.10 acre lot, 2-car garage
  • Status: Still under construction, currently listed and unsold
  • HOA: $119/mo — includes high-speed internet, pool, playground, sport court
  • List history: listed $286,999 → cut to $276,999 → builder now offering $272,999

The deal on the table

Builder's offer$272,999 ($144/sqft)
Builder closing-cost credit2% (~$5,460)
Down payment25% — $68,250
Loan amount$204,749
Rate5.15%, 30-yr fixed (builder-lender buydown; market investor rate is 7.28–7.78%)
APR~5.20–5.28%
P&I$1,118/mo
Est. net closing + pre-rent holding~$6,600
Total cash to close~$74,850
All-in basis~$279,600

Income and expenses

Rent estimate: $2,100/mo ($1.11/sqft). Local 4-bed average is $2,185 and down ~4% YoY. I'm discounting because this is a 4/2 — three bedrooms upstairs sharing one bath, owner's suite down — so it competes below the 4/3 and 4/2.5 stock.

MonthlyAmount
Gross rent$2,100
Property tax @ 2.726%−$620
Insurance ($2,000/yr)−$167
HOA $119 less ~$70 internet passed to tenant−$53
Vacancy @ 6%−$126
Maintenance @ 2% (new build, 1-2-10 warranty)−$42
CapEx reserve @ 3%−$63
Leasing/turnover @ 2%−$42
NOI (self-managed)$987
Debt service−$1,118
Cash flow (self-managed)−$131/mo (−$1,572/yr)
Cash flow (with 8% PM)−$299/mo (−$3,588/yr)

Tenant's all-in housing cost is therefore $2,170/mo ($2,100 rent + $70 internet) — versus a local 4-bed average of $2,185. The logic is that the tenant would buy internet anyway, so bundling it is roughly cost-neutral to them. Tell me if that's wishful thinking.

The metrics

MetricSelf-managedWith PM
Cap rate (all-in basis)4.24%3.51%
Cash-on-cash−2.10%−4.79%
True DSCR (NOI / debt service)0.880.73
Lender DSCR (gross rent / PITIA)1.071.07
Rent-to-price (all-in)0.75%0.75%

Breakeven purchase price for $0 cash flow: ~$252,000 self-managed, ~$226,000 with a manager. That's $21K–$47K below what the builder will accept. (If the internet pass-through doesn't hold, those drop to $242K / $216K.)

Two things that surprised me

Taxes are 2.726% effective. Base stack here (school + county + city + ESD) is ~2.095%, so there's roughly 0.63% of MUD or PID on top — about $1,720/yr. Taxes eat 30% of gross rent. The listing shows $1,474/yr because that's the land-only assessment on an unfinished house; the real bill is ~$7,442.

HOA is $119/mo, not the $60–70 I'd budgeted — it bundles high-speed internet. I'm modeling ~$70 of that as recovered from the tenant, so my net carry is ~$53/mo after adjusting for vacancy months when I eat the full fee. Sensitivity on how much actually sticks, self-managed:

Internet recoveredNet HOACash flow
$0 (can't pass it through)$119−$197/mo
$35$86−$164/mo
$70 (my base case)$53−$131/mo

Why I'm not counting on tax benefits

I'm underwriting this as if the tax shelter is worth zero in the early years. Passive activity loss limits apply in my situation, so rental losses suspend and carry forward rather than offsetting ordinary income, and there's no real estate professional status in the household.

Over a long hold the suspended losses do release at sale — but they get largely offset by depreciation recapture at 25%. Net of both, I treat the tax treatment as roughly neutral, not as a subsidy. Cost segregation plus bonus depreciation would throw off a large year-one number, but in my case it would just add to the suspended pile.

If your view is that I'm being too conservative here, I'd like to hear it — but I'd rather a deal stand on its own cash flow than lean on a shelter I can't currently use.

What's actually good here

  • 5.15% fixed vs a 7.28%+ market investor rate — about $290/mo cheaper than market, equivalent to roughly $55K off the price in payment terms.
  • Brand new: 1-2-10 warranty, low repair variance for several years.
  • The builder ran ~12.9% incentives company-wide last quarter against a stated 4–6% "normal," so I believe I'm buying into real builder distress, not a fake discount.
  • Price has moved $14,000 off original list and they're still negotiating.

What worries me

  1. Rents are falling (−4% YoY) while any pro forma I write assumes growth.
  2. The builder is still delivering homes on the same street — I compete with new inventory on rent and on eventual resale, and they can discount in ways I can't.
  3. Build-to-rent operators may hold the same floorplan in the community. Haven't confirmed how many.
  4. 4/2 configuration limits the tenant pool vs nearby 4/3 stock.
  5. Retail price, zero instant equity, from a seller publicly cutting prices.
  6. A 3.5–4.2% cap rate is barely above what T-bills pay, with none of the risk.

My questions

  1. Does a ~4% cap with negative carry ever make sense if the financing is genuinely below market and fixed for 30 years? 
  2. Or is "below-market rate on an above-market price" just the premium repackaged?
  3. What reserve % do you actually use on new construction? 
  4. I used 2% maintenance + 3% CapEx. Too light for a long hold? Should I phase it (near-zero years 1–3, ramping later) rather than use a flat rate?
  5. Can you actually recover a bundled internet fee from a tenant? 
  6. I'm assuming ~$70/mo of the HOA comes back to me, on the theory the tenant would buy internet anyway. Does that hold in practice, or do tenants just treat it as rent and push the total back down?
  7. How do you underwrite MUD/PID risk? 
  8. Does the rate reliably decline as district debt amortizes, or should I assume it holds? What should I ask about the service plan?
  9. Am I wrong to discount the 4/2? 
  10. How much rent penalty vs a 4/2.5 or 4/3 in a family-rental submarket?
  11. Anyone bought new construction in an Austin-metro exurb in the last 18 months — how did rents and vacancy actually come in vs your pro forma?
  12. Would you walk, or hold at ~$252K and let them say no?
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Ricky TrinidadPro Member
Pittsburgh, PA · Member since 2026 · 21 posts · 7 votes
1mo

I build for a living, 28 years and about 20 of them on new construction, so let me answer this from the other side of the table, because the one thing your very thorough analysis cannot see is how the builder is thinking.

The buydown is not a discount. It is comp protection. When I cut price on one house, I reset the appraisal comp for every unsold lot on the street and invite every buyer already under contract to demand the same cut. When I pay for a rate buydown or closing credits instead, the recorded price stays high and the comps stay intact. That is why you were offered $290 a month instead of $21,000 off. It also costs the builder less than it is worth on paper, because builder-lender forward commitments buy rate cheaper than you ever could.

That tells you two things. First, the sticker will bend less than the incentives will. A builder running 12.9% community-wide incentives is motivated, but cutting your recorded price to $252K is the last lever they will pull. If you counter, structure it as a package: some price, a bigger closing credit, buydown intact. You can often reach the same all-in math without making them touch the comp.

Second, and I would weigh this heaviest: the same comp protection blocking your discount today becomes your competition tomorrow. The builder is still delivering on your street. Every future appraisal, resale, and rent listing you post competes against a brand-new version of your house with fresh incentives attached. You are not buying the bottom of that street. The builder sets the bottom, and they are not done selling.

Your $252K discipline is right. I would add one input to it: how many lots the builder has left. Fifty to go, I walk at any price. Five to go, the comp pressure ends soon and $252K as a package number is a real conversation.

The buydown lives only as long as the loan. The basis lives as long as you own the house.

Ricky Trinidad

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  • Robin SimonBusiness Member
    Lender · Austin, TX · Member since 2022 · 5k+ posts · 4k+ votes
    1mo

    I think there are way way better opportunities than this with your capital - the below market rate and negative cash flow is not worth it IMO.  Austin certainly has some opportunities for appreciation plays like this - but this is Hutto, not Austin, and I'd doubt that it its going to see extreme supply-constrained appreciation even if thats a good bet in Austin in general -- I think those are going to come from great locations near the water/downtown, not suburbs (just all my opinion)

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  • Costin I.
    Rental Property Investor · Round Rock, TX · Member since 2016 · 1k+ posts · 971 votes
    1mo

    That's one nice alligator you are looking to buy there...and it seems to be in an alligator farm too. You can do better.

    That's the simple fast answer. Some answers to your questions:

    1. No, it doesn't IMO. Your property needs to cashflow positive from the start, not hope it will get better in time.

    2. Make sure that rate discount is real, not temporary.

    3. I use 5% for maintenance, and 5% for CapEx. With a brand new property, wih warranty, you might be able to go down a bit, to 3%. But with the quality of construction these days (just search YT for "home inspection" videos on new builds to see some scary movies) and if you plan on holding long term (5yr+), both annual maintenance and CapEx will eventually move into 5%+ territory. It's just that it's more unlikely you'll have to deal with that right from the start, for the first few years - it doesn't mean you'll not have those expenses forever.

    5. To recover the internet, first you need to have that tenant. They have to like that particular provider and accept the cost of that internet package. And you have to be ok with them running on the internet on a connection you pay for, with all the liabilities associated. And deal with what happens if the service goes down, or gets more expensive, etc. Generally speaking, in the rental business, IMO, if it's not making you money, it's getting removed.

    7. The taxes, and MUD/PID...are eternal. And rarely go down. You can pay off the mortgage, but the taxes will be forever and rarely go down significantly (and if the appraisal value goes down, the officials will raise the tax rate...your property tax dollar amount will stay the same at best in a lousy year, and increase in a good appreciation year). Sometimes, MUD fees have a lifetime, and you can hope for their expiration. Key word is hope.

    9. I wouldn't discount 4/2 vs 4/2.5

    11. Did not buy new because the numbers don't make sense. Especially in a BTR community, where you'll have to compete with a bunch of other similar rentals in a race to the bottom.

    12. Make them an offer at the price that makes sense to you. Asking price is irrelevant for an investment property.

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  • Ricky TrinidadPro Member
    Pittsburgh, PA · Member since 2026 · 21 posts · 7 votes
    1mo

    I build for a living, 28 years and about 20 of them on new construction, so let me answer this from the other side of the table, because the one thing your very thorough analysis cannot see is how the builder is thinking.

    The buydown is not a discount. It is comp protection. When I cut price on one house, I reset the appraisal comp for every unsold lot on the street and invite every buyer already under contract to demand the same cut. When I pay for a rate buydown or closing credits instead, the recorded price stays high and the comps stay intact. That is why you were offered $290 a month instead of $21,000 off. It also costs the builder less than it is worth on paper, because builder-lender forward commitments buy rate cheaper than you ever could.

    That tells you two things. First, the sticker will bend less than the incentives will. A builder running 12.9% community-wide incentives is motivated, but cutting your recorded price to $252K is the last lever they will pull. If you counter, structure it as a package: some price, a bigger closing credit, buydown intact. You can often reach the same all-in math without making them touch the comp.

    Second, and I would weigh this heaviest: the same comp protection blocking your discount today becomes your competition tomorrow. The builder is still delivering on your street. Every future appraisal, resale, and rent listing you post competes against a brand-new version of your house with fresh incentives attached. You are not buying the bottom of that street. The builder sets the bottom, and they are not done selling.

    Your $252K discipline is right. I would add one input to it: how many lots the builder has left. Fifty to go, I walk at any price. Five to go, the comp pressure ends soon and $252K as a package number is a real conversation.

    The buydown lives only as long as the loan. The basis lives as long as you own the house.

    Ricky Trinidad

    1Reply
  • Yvinson Pierre
    Member since 2021 · 8 posts · 0 votes
    1mo

    Hey Ronak — I ran the numbers the way you laid them out.

    The 5.15% buydown is real (about $290/mo vs a 7.3% investor rate). It does not close the $21k gap you already found. At $272,999 you're at 0.75% rent-to-price and a 0.88 true DSCR. The 1.07 lender DSCR is the gross-rent version — it ignores tax, HOA, and reserves. Your −$131/mo self-managed is the honest number.

    I would not take the rate as a reason to pay $21k above your own $0-cash-flow price. Hold $252k or walk. If they will not move, the financing is just the premium in another envelope — which is the question you already asked.

    If you want a second pass at $252k next to $273k, reply here and I’ll run it.

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  • Ashish AcharyaBusiness Member
    CPA, CFP®, PFS · FL · Member since 2017 · 5k+ posts · 3k+ votes
    1mo

    Ronak, I think your underwriting is pointing you in the right direction: the rate should improve a good deal, not be the reason a weak deal becomes acceptable.

    A 5.15% fixed rate absolutely has value, but I’d still make the property earn its keep at the actual purchase price. If you’re negative before management, have little or no equity going in, rents are soft, and the builder is still adding competing inventory, I would be very hesitant to pay a premium just because the financing is attractive. You’re effectively choosing between paying more for the house or paying more for the debt.

    I’d also treat the internet recovery conservatively. If tenants will pay $2,170 all-in because the comparable alternatives cost the same or more, great. But I wouldn’t assume they mentally separate “rent” from “internet.” What matters is the total monthly housing cost they compare against competing rentals.

    On reserves, I like your instinct to underwrite the long hold rather than pretend a new build has no future CapEx. The warranty may reduce early repair volatility, but roofs, HVAC, appliances, turnover, and exterior items eventually show up. I'd rather have slightly conservative reserves and be pleasantly surprised.

    Your tax thinking is also mostly where I’d land. Cost segregation can still accelerate depreciation, but if you cannot currently use the losses, I would not let a large year-one deduction influence whether you buy. Suspended passive losses can have future value, but that is very different from receiving an immediate tax subsidy. I’d do the cost-seg analysis only after the underlying investment works.

    At $252K, I’d be much more interested. At $273K, I’d want a very compelling reason to accept negative carry and no immediate equity. I would be comfortable holding your number and letting the builder say no.

    Happy to connect!

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  • Jay HinrichsBusiness Member
    Real Estate Consultant · Summerlin, NV · Member since 2014 · 45k+ posts · 66k+ votes
    1mo

    probably good deal for owner occ..  keep in mind unless they are building these developments for 100% investors.. Its hard to approach these simply as cash flow investments with the minimum down.  Put more down to get to brake even. ? 

    Also keep in mind developments that are loaded with rentals even though they are new will not appreciate like developments with little to no renters.. Renters just do not care for homes like owners do and it shows after a few years. And then the resale value is like any other rental its only worth what an investor will pay for a given cash flow.. 

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