For serious-but-small real estate investors

Underwrite Your Next House-Hack or Small Multifamily Deal Like a Pro.

Get the free Rental ROI Calculator — plus the plain-English breakdowns, checklists, and compliance know-how the generic calculators and hype gurus leave out.

✓ You're in. Check your inbox for your ROI calculator link and first breakdown.

Free forever. No spam. Unsubscribe anytime.

✓ Built for 2–4 unit deals & ADUs ✓ Underwriting + compliance in one place

Why Jarsl

Free Calculators Give You a Number. They Don't Tell You if It's a Good Deal.

Most investors are stuck between generic tools that oversimplify and gurus selling hype. Serious money is made in the details — the ones nobody hands you for free.

The Free-Tool & Guru Trap

✕ A calculator spits out a cap rate with no context on whether the deal actually clears.
✕ Advice that ignores financing rules, taxes, and local compliance.
✕ Courses that sell a dream but skip the underwriting math.
✕ Nobody to ask when a real deal gets complicated.

The Jarsl Way

✓ Underwriting that tells you go / no-go, not just a raw number.
✓ Numbers grounded in real financing rules — including the 2026 ADU income change.
✓ Compliance know-how from a background in wealth management & PropTech.
✓ A community and expert to check your thinking before you wire a deposit.

Start free

Everything You Need to Screen Your First (or Next) Deal

Join the email list and get instant access to the tools that turn a listing into a confident decision.

📊

The Rental ROI Calculator

Drop in a small multifamily or house-hack property and get cash flow, cash-on-cash, DSCR, and a clear go / no-go read in minutes.

✅

Due-Diligence Checklist

The exact steps to vet a property before you make an offer — so nothing expensive surprises you at closing.

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Weekly Investor Breakdowns

One concrete lesson a week: how to underwrite a duplex, read an STR market, or use the new ADU rule. No fluff.

NEW · 2026

The ADU Rule Just Changed the Math on House-Hacking

As of Fannie Mae's Desktop Underwriter 12.1 update (March 2026), rental income from an accessory dwelling unit can now count toward qualifying on a one-unit primary residence — up to 30% of your total qualifying income. That means deals that didn't pencil last year might qualify today. We'll show you exactly how to model it.

Go deeper

Pro Tools for When You're Ready to Move on a Deal

Professional, ownable resources — priced to pay for themselves on a single good decision.

Deal Analyzer Pro — compare three deals side by side — Compare three deals side by side

Deal Analyzer Pro — automatic Buy / Consider / Pass score — An automatic Buy / Consider / Pass score

FLAGSHIP

Deal Analyzer Pro

$79

The full underwriting spreadsheet: multi-scenario modeling, financing toggles, sensitivity analysis, and a lender-ready summary.

Get it · $79 →

STR Underwriting Kit

$97

Screen a short-term rental market and property before you buy — revenue modeling, seasonality, and regulatory-risk checks.

Coming soon

Reg D Compliance Starter

$249

Plain-English starting templates for raising from investors the right way. Built from real compliance experience.

Coming soon

The Everything Bundle

$399

Every tool above, plus priority updates — the complete investor toolkit at the best value.

Coming soon

Every purchase includes a founding-member invite to the Jarsl community.

Coming soon

The Jarsl Membership

The tools, the monthly deal breakdowns, and the community of investors doing exactly what you're doing. Founding-member pricing locks in for life.

Free

✓ Weekly newsletter & public content
✓ Free Rental ROI Calculator & checklists
✓ Community-lite access

Start free

★ Founding waitlist

Investor

$39/mo · $390/yr

✓ Full tool & template library
✓ Monthly deal breakdowns
✓ Member community + live Q&A

Join the waitlist

Pro

$99/mo · $990/yr

✓ Everything in Investor
✓ Compliance vault (Reg D edge)
✓ Live underwriting sessions + market data

Join the waitlist

Join the Founding-Member Waitlist

Lock in founding-member pricing for life. No charge now — we'll email you the moment doors open.

✓ You're on the founding-member waitlist. We'll be in touch before launch.

No charge now. Unsubscribe anytime.

Built by an Operator, Not an Influencer

Jarsl comes from a background where the details actually matter — compliance, wealth management, and property technology. The kind of experience most people building "real estate tools" simply don't have.

That's the whole point: anyone can ship a calculator. Very few can speak credibly to underwriting and Reg D compliance and wealth strategy in the same breath. That's the edge you get here.

Underwriting Reg D compliance Wealth strategy PropTech

FAQ

Common questions

What is Jarsl?

Jarsl builds deal-analysis tools and plain-English underwriting resources for serious-but-small real estate investors — house-hackers and buyers of 2–4 unit and small multifamily properties. It's built by an operator with a background in compliance, wealth management, and proptech, not an influencer.

Is the Rental ROI Calculator really free?

Yes. The Rental ROI Calculator is free to use right in your browser — no signup required to run the numbers. It estimates cap rate, monthly cash flow, cash-on-cash return, NOI, and the 1% rule, and gives a clear Buy / Consider / Pass verdict.

What is Deal Analyzer Pro?

Deal Analyzer Pro is a $79 one-time underwriting workbook (Excel + Google Sheets) that analyzes rentals, flips, and BRRRRs, stress-tests the downside, and produces a lender-ready one-page report. It's the paid upgrade to the free calculator.

Who is Jarsl for?

Serious-but-small investors — people buying house-hacks, single-family rentals, 2–4 unit small multifamily, short-term rentals, or doing their first BRRRR or capital raise — who want lender-grade numbers and a clear go/no-go, not hype.

Is this financial or investment advice?

No. Jarsl's tools and content are educational estimating and information resources only — not financial, legal, tax, or investment advice. Verify every figure with your own qualified professionals before making a decision.

Start With the Free ROI Calculator

Drop your email and we'll send the calculator, the plain-English breakdowns, and the checklists — the underwriting edge the hype gurus leave out.

✓ You're in. Check your inbox for your ROI calculator link and first breakdown.

Free forever. No spam. Unsubscribe anytime.