Most tools price what it costs to buy a property. RendiScore prices what it costs to own one.
Every listing and every other calculator shows you the investment case: price, financing, expected rent. RendiScore is built around the one thing they all leave out — the real ongoing cost of running the property, maintenance and reserves included — because that's what actually decides your cash flow and return.
Free to use on one property at a time. €39 one-time purchase unlocks saving & comparing properties.
A real listing, run through RendiScore
Not a cherry-picked success story — an honest example of the gap between what a listing implies and what the numbers actually say.
On paper this looks like an ordinary Leipzig-style buy: €300k for 70 m², renting at €12/m². Run it through RendiScore and the picture sharpens: the breakeven rent is €1,346/month — €531 more than the €815 you'd realistically collect. That gap shows up immediately as negative cash flow, and the first year needs €95,863 in cash once closing costs and reserves are counted, not just the €60,000 downpayment. It isn't a bad property — the 10-year return is real — but it's not what the listing implied, and you'd want to know that before making an offer.
RendiScore also has a dedicated section for modeling renovation costs and their own tax deductibility, for properties that need work before they're rentable — not used in this particular example.
Why we show three return numbers, not one
CAGR (2.85%) is the naive number — but it understates the cash actually tied up, because it ignores the reserve fund sitting alongside your equity. CAGR incl. reserves (5.11%) counts that reserve as capital invested — more honest, but still assumes it earns nothing. MIRR incl. reserves (7.93%) also credits that reserve for compounding at a bank rate while it waits to be used. Your realistic expected return sits between the two reserve-aware numbers, not at whichever single figure looks best on a listing.
Why the blended score, not a cap rate
RendiScore's headline number blends CAGR, CAGR incl. reserves, and MIRR incl. reserves — plus your cash-flow cushion and leverage risk — into one 0–100 score. A property with an attractive rent-per-m² can still score low if it needs more leverage or thinner reserves to get there; a plainer-looking one can score higher on cash-flow safety alone. That's the point: two properties that look similar on paper can score very differently once reserves and risk are priced in.
Full 3-property comparison, every section expanded (PDF) →
Four things nothing else does — everything else is table stakes
Cash flow, financing, and tax handling are things any decent calculator should get right. These are the parts that actually change your decision.
Real cost calculationThe big one
Every listing and most calculators stop at mortgage vs. rent. RendiScore also prices in the maintenance and reserve fund every rental actually needs — which is usually the difference between a listing's numbers and the real ones. See it in the worked example above: a €266/month shortfall becomes €965 once reserves are counted honestly.
MIRR, not just cap rateReturn
RendiScore blends CAGR, CAGR incl. reserves, and MIRR incl. reserves into one return figure — instead of the single flattering number a cap rate or simple ROI gives you. It's the difference between a return that looks good on a listing and one you'd actually get.
Every KPI, one screenClarity
Breakeven rent, year-1 cash needed, 10-year return, cap rate — computed and laid out clearly, instead of buried across tabs in a spreadsheet you built yourself.
Save & compare propertiesCompare
Save every property you evaluate and compare them side-by-side on the metrics that matter — the same real comparison view shown further up this page.
Stress testRisk
Model a one-off unplanned cost in any year — a special assessment, a boiler replacement, a vacancy gap — and see exactly how it moves your cash flow and returns, drawn from your reserve fund first.
Sondertilgung modelingFinancing
Model real extra principal payments against a specific loan, in specific years, the way German mortgages actually let you pay them down — and see the compounding effect on your equity.
Capital-gains-tax timingTax
Germany's §23 EStG exempts private property sales from capital gains tax after 10 years. RendiScore tracks that date for every property and flags the first CGT-free year to sell.
Refinancing calculationsStrategy
See your equity pull-out potential at any year — how much you could refinance out of a property as it appreciates and your loan amortizes, without selling.
30-year projectionCore
Year-by-year cash flow, loan balance, property value, and after-tax returns for up to 30 years — not just a single "cap rate" snapshot.
Renovation & deductions modelingTax
Add each renovation item with its own year, cost, and financing. RendiScore tracks Germany's 15%-Grenze (§6 Abs. 1 Nr. 1a EStG) automatically, so you know whether a cost is immediately deductible (Sofort) or has to be capitalized into the AfA basis — and models the effect on your cash flow and returns either way.
One purchase. Yours for good.
No subscription, no recurring fee, no account required to start.
- Full 30-year projection engine, unlimited use
- Stress test, Sondertilgung modeling, CGT timing, refinancing calculations
- Save unlimited properties & compare them side-by-side
- Works on up to 5 devices
- One-time purchase — no subscription, ever
The calculator itself is free to try on one property. Purchase only unlocks saving & comparing multiple properties.
Built by expats who bought German property themselves — and got burned by realtor numbers first
RendiScore was built and reviewed by a small group of expats from different countries, all living in Germany, all real estate investors ourselves. Between us we've read the books, researched the market, and bought property here — and before this, each of us had already built our own spreadsheet or tool just to make sense of a listing.
Every one of us found real mistakes along the way — return figures that quietly left out reserves, cash-flow projections that assumed the mortgage was the only cost, a "great deal" that stopped looking great once maintenance was priced in. We combined what we'd each learned — and each gotten wrong the first time — into one tool.