j jarsl

For everyday real estate investors

Underwrite Your Next Real Estate Deal — and Keep More at Tax Time.

Run the numbers with our free calculators, no signup needed. Then grab the free Rental Deal Pack: a deal-screening cheat sheet, due-diligence checklist, and offer-analysis worksheet, plus the plain-English breakdowns the hype gurus leave out.

✓ You're in. Check your inbox for your Rental Deal Pack and your first breakdown.

Free forever. No spam. Unsubscribe anytime.

✓ For rentals, flips, BRRRRs & short-term rentals ✓ Underwriting + tax planning 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 the details that decide the deal.
✕ 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 and tax rules, including the 2026 depreciation changes.
✓ Tax and underwriting know-how from years advising on real estate and wealth.
✓ 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 any rental and get cash flow, cash-on-cash, DSCR, and a clear go / no-go read in minutes.

Open the calculator →

🧾

Rental Depreciation Calculator

See your yearly depreciation deduction and the tax it saves, with the 27.5-year and IRS mid-month math handled for you.

Open the calculator →

💵

Cash Flow Calculator

Project a rental's cash flow year by year and watch rising rents pull away from a fixed mortgage, with a cumulative total and the year it repays your down payment.

Open the calculator →

🧮

Capital Gains Tax Calculator

See the real tax bill on selling a rental: depreciation recapture, 2026 capital gains rates, the 3.8% surtax, and state tax, plus your net cash at closing.

Open the calculator →

✅

Due-Diligence Checklist

Free · sent by email

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

Join to get it →

📬

Weekly Investor Breakdowns

Free · sent by email

One concrete lesson a week: how to underwrite a rental, cut your tax bill, or avoid a costly mistake. No fluff.

Join the list →

NEW · 2026

The 2026 Real Estate Tax Playbook

The July 2025 tax law made 100% bonus depreciation permanent — and quietly made almost every depreciation guide online wrong. Our 2026 edition is verified to the IRS source and built around one question: should you take this deduction, on this property, this year, and what's it worth? 38 pages, plain English. Arriving October 15. Get on the list →

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 → See details & images →

STR Underwriting Kit

$97

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

Coming soon

The 2026 Tax Playbook

$39

Depreciation, bonus depreciation, and cost segregation for small rental owners — verified to the IRS source and built around "should you, on this property, this year." 38 pages.

Coming Oct 15 · get notified →

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
✓ Tax-strategy vault + quarterly updates
✓ 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 isn't built from blog posts. For years I've been hands-on with a private real estate portfolio — around $50 million in property — and involved in close to $25 million of transactions. I keep the books in QuickBooks, manage the insurance, work the capital-improvement decisions, and sit alongside the CPAs and attorneys who turn a deal into a done deal.

That's where real money is made and lost: the land-versus-building allocation on a purchase, the repair-versus-improvement call on a renovation, a lease structured right, a refinance timed well. It's unglamorous, and it's exactly what the free calculators and the hype gurus skip. That's the perspective built into every tool and playbook here.

~$50M portfolio $25M+ in transactions Books, tax & insurance Deals & allocation

FAQ

Common questions

What is Jarsl?

Jarsl builds deal-analysis tools, plain-English underwriting resources, and real estate tax guides for everyday investors — from single-family rentals to small multifamily and short-term rentals. It's built by someone hands-on with a private real estate portfolio (~$50M in property, ~$25M in transactions) — handling the books, taxes, insurance, and deal decisions day to day.

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?

Everyday real estate investors — people buying single-family rentals, 2–4 unit small multifamily, or short-term rentals, or doing a flip or BRRRR — who want lender-grade numbers, clear tax guidance, and a confident go or no-go.

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.

Get the Free Rental Deal Pack

The calculators are free, no signup needed. Drop your email and we'll send the Rental Deal Pack: a deal-screening cheat sheet, due-diligence checklist, and offer-analysis worksheet, plus the weekly investor breakdowns the hype gurus leave out.

✓ You're in. Check your inbox for your Rental Deal Pack and your first breakdown.

Free forever. No spam. Unsubscribe anytime.