Rent or buy calculation: 30 years, 3 tested scenarios, 11 tips — is buying worth it in 2026?

TVS News AI, editorially supervised, presents Rent or buy calculation: 30 years, 3 tested scenarios, 11 tips — is buying worth it in 2026.

“Rent is wasted money” is not a calculation—and “concrete doesn’t pay” is not one either. If you are choosing between renting and owning a home in Germany, the real question is which small change to an assumption flips the result. One published model leaves the buyer €69,913 ahead after 30 years; lower the monthly cold rent by €400, and the renter ends €280,032 ahead. Your deposit, tax band and returns on your savings matter more than the slogan.

The useful approach is a repeatable stress test, not an anecdotal account of one buyer’s experience. Start with the published standard case, change one input at a time, and see who wins. That turns “buy versus rent” into something you can inspect.

Updated 2026. The examples come from a German model in euros. If you are comparing property elsewhere, keep the method but replace the German purchase tax, financing and tax treatment with local rules. Modelled outcomes are not guaranteed returns.

Rent or buy calculation: the standard case starts with a 23.8 ratio

Calcuro’s standard case combines a purchase price of €400,000 with monthly cold rent of €1,400. That is €16,800 a year, so the price equals 23.8 times annual cold rent.

What 23.8 tells you—and what it does not

It is a scale check, not a break-even rent. Keep the price at €400,000 and cut cold rent to €1,000; annual rent becomes €12,000 and the same ratio becomes 33.3. The property did not change. The rent assumption did.

The €69,913 endpoint

Calcuro reports that the buyer is around €69,913 ahead after 30 years in this standard case. That is a gap between two modelled wealth paths at one endpoint. It is not cash in an account, nor is it a guaranteed return. It also gives you a clear baseline for the stress tests that follow.

A €400 rent change reverses the winner

Calcuro’s sensitivity table is more useful than the base result because it shows which input the answer actually depends on.

Cold rent at €1,000: renter ahead by €280,032

The monthly cash difference is €400, or €4,800 a year. In the lower-rent scenario, the renter finishes €280,032 ahead after 30 years. Do not confuse that endpoint with €4,800 of extra cash: the model also tracks the renter’s deposit and monthly savings, alongside the money the buyer has tied into the property.

Return at 7%: renter ahead by €683,177

Change the assumed investment return from 4% to 7% and the same 30-year comparison swings to a €683,177 renter lead. Seven percent is a scenario assumption, not a promise. The lesson is precise: the winner depends heavily on what happens to money that is not tied up in the home.

Your deposit must exist before it can earn anything

The renter’s case is strongest when the deposit and monthly savings are real and invested. If delivery work is meant to build that deposit, compare the cash you actually keep rather than relying on a gross-pay headline. The Amazon Flex block guide, the Wolt driver earnings report and the Uber Eats earnings breakdown are useful when building that cash-flow view.

The calculator opens with €75 for 3 hours as a default. Replace it with your own realistic net earnings; a default is not a forecast.

The €400,000 price hides a €14,000–€26,000 tax spread

Germany’s property transfer tax (Grunderwerbsteuer) has a rate of 3.5% to 6.5%, depending on the federal state. Applied to €400,000, that is €14,000 to €26,000—a €12,000 spread before other acquisition costs. Calcuro also mentions a legal deduction for inventory; that is a case-specific rule, not an automatic discount.

The three factors UMSgeld says are often missed

UMSgeld identifies three factors that housing comparisons often underestimate:

• Purchase ancillary costs beyond the advertised price.
• Ongoing maintenance that remains with the owner.
• Opportunity cost of the deposit and savings.

Leaving maintenance at zero does not make ownership free; it simply hides the repair bill outside the horizon. A proper comparison is only useful when both sides keep every relevant cost visible.

Subtle model choices can outrank the property

Lazyinvestors says its estimate includes taxes, costs and inflation and uses daily compounding over 365 days. Those disclosures matter because two calculators using different methods can produce different winners without either one being wrong.

The 10-year sale assumption

In the calculation cited by Lazyinvestors, a property sold after 10 years is treated as tax-free at sale, so no sale tax is deducted. That treatment is only valid if your exit date and tax position match the calculation. If your horizon is different, make the exit treatment visible instead of inheriting it silently.

ETF tax timing and negative savings rates

The renter’s ETF wealth is shown before a hypothetical one-off disposal tax because the model assumes that withdrawals are spread across many years. With negative savings rates, the model mathematically reduces the ETF holding without adding another deemed-disposal tax. That is a transparent simplification, but it must still reflect how you would actually make withdrawals.

Three filters before you trust a winner

1. Break-even rent

Deltaeffekt’s rule works well as a first filter: if the calculated break-even rent is far above the rent you would actually pay, the normal case no longer applies. If the two figures are close, errors in maintenance, returns or tax treatment can decide the answer.

2. One endpoint for both paths

Immoson warns that comparing the mortgage payment with rent is too short a test because it ignores what each side owns and owes. Compare final assets minus liabilities on the same date; the 30-year endpoint is useful only if it resembles your plan.

3. One variable per test

Do not lower rent, raise returns and shorten the horizon in the same run. Change one input, record the new winner, then undo it. A conclusion that survives that sequence is worth more than a headline number.

Worth it for you if… not for you if…

Buying is worth it for you if the buyer still leads after the applicable 3.5%–6.5% purchase-tax band, purchase ancillary costs, maintenance and opportunity cost—and if ownership is part of what you want. UMSgeld is right that this is a life decision, not just a spreadsheet calculation.

Buying is not for you if the result only works with an unrealistic rent or return, or if a plausible lower rent flips the winner to the renter by €280,032. A purchase price is not evidence that the purchase wins.

Renting is worth it for you if your actual cold rent is lower than in the standard case, the renter’s path stays ahead under defensible assumptions and keeping the deposit liquid matters. Financially, renting is weaker when the standard inputs apply: Calcuro’s base case still leaves the buyer €69,913 ahead.

The strongest argument on each side deserves a hearing. Against buying: the lower-rent and 7% cases favour the renter by €280,032 and €683,177. Against renting: the standard buyer leads by €69,913. Neither slogan settles your inputs.

11 questions to ask before you sign

Is 23.8 a buy signal?

No. €400,000 ÷ €16,800 = 23.8 is a scale check. At €1,000 cold rent, it becomes 33.3. It does not decide the winner.

Which property transfer tax band applies?

Use the 3.5%–6.5% band for your federal state, not a midpoint. On €400,000, that is €14,000–€26,000. Check separately whether the legal inventory deduction applies to your case.

Are the purchase ancillary costs visible?

UMSgeld names them as one of three underestimated factors. Keep them separate from the advertised price. If they disappear into one adjustment, you cannot see what changed the result.

What maintenance allowance did you use?

Name a number or a documented method. A zero allowance does not remove maintenance; it postpones the repair cost outside the 30-year comparison.

What return do the deposit and savings receive?

Calcuro shows why this matters: moving from 4% to 7% turns the €69,913 buyer lead into a €683,177 renter lead. Use an assumption you can defend; neither return is guaranteed.

Do both paths end on the same date?

Compare final assets minus liabilities at one endpoint. A 30-year horizon is useful only if it resembles your plan; Immoson’s point is that payment versus rent alone is too short.

Is the compounding method identical?

Lazyinvestors uses 365-day daily compounding and includes taxes, costs and inflation. Align those choices before treating another calculator’s output as a second opinion.

Does the 10-year sale assumption fit?

The cited calculation deducts no sale tax after 10 years. If your likely sale date differs, show how the exit is treated rather than letting the model decide silently.

Does ETF tax timing match your withdrawals?

The model uses ETF wealth before a hypothetical one-off disposal tax because withdrawals are spread across years. Its negative-savings simplification also removes the holding without adding another deemed-disposal tax. Match the real plan.

Is break-even rent close to what you would pay?

Deltaeffekt says a break-even rent far above the actual rent means the normal case does not apply. If the figures are close, a small change in maintenance, return or tax treatment may flip the winner.

Which single input reverses the winner?

Write it down. The base case favours the buyer by €69,913; lower rent favours the renter by €280,032; a 7% return favours the renter by €683,177. Your decision should name its fragile input.

A seven-day test before you commit

1. Day 1: Record the purchase price, contractual cold rent, ancillary charges and deposit.
2. Day 2: Add the applicable 3.5%–6.5% purchase-tax band and the purchase ancillary costs.
3. Day 3: Add financing, maintenance, and the renter’s deposit and monthly savings.
4. Day 4: Give both paths the same endpoint and the same compounding method.
5. Day 5: Change one input—rent or return—and record the new winner.
6. Day 6: Compare final assets minus liabilities and identify the input that flips the result.
7. Day 7: If one realistic input change flips the winner, keep both paths open rather than treating the model as a verdict.

The bottom line: do not pick the winner before testing it

Buying is worth it for you if it survives your realistic cost assumptions and matches the life you want. Renting is worth it for you if the lower-cost path and the renter’s investment case are genuinely stronger. If you cannot name the one assumption that reverses the result, you do not have a decision yet—you have a number.