KfW Subsidies 2026: All 6 Programs Explained

KfW funding is one of the strongest levers for cheap real-estate financing in Germany. It pairs low-interest loans with real repayment grants — meaning money that reduces your remaining debt and never has to be paid back.

Finanz Kompass supports all six KfW programs that are relevant today. This post walks through which program fits which life situation, how KfW interacts with a regular bank loan, and where you can run the numbers for your own case.

How KfW financing works: the blended-loan principle

A KfW loan rarely replaces your full mortgage — it complements it. You combine a regular bank loan at the bank's nominal rate with a subsidized KfW tranche at a discounted rate. The result is a blended financing with a weighted-average rate that sits clearly below the market level.

Blended rate = (bank loan × bank rate + KfW loan × KfW rate) / total loan

Example: €200,000 bank at 3.5 % + €100,000 KfW at 1.5 % = a blended rate of about 2.83 %. The effect over 30 years is substantial — and that is exactly what the blended-financing calculator makes visible for your case.

Important: KfW loans are applied for through your house bank before you sign the purchase contract. Reverse the order and most programs will reject the application.

The 6 KfW programs in detail

KfW 261 — Residential Building Loan (Renovation)

KfW 261 is the central program for energy-efficient renovation of existing buildings. You modernize a house or apartment toward Effizienzhaus 85, 70, 55 or 40 — and KfW rewards that on two layers: a low interest rate plus a repayment grant of 5 % to 45 % of the loan amount.

• Maximum loan: up to €150,000 per residential unit
• Typical advantage: roughly 1 % below market rate
• Repayment grant: up to €67,500 wiped from the remaining debt at the highest tier
• Required: an accredited energy-efficiency expert must accompany the project

The lower the efficiency tier, the bigger the grant. To see how that flows through to your monthly payment and remaining debt, use the KfW 261 calculator.

KfW 297 — Climate-Friendly New Construction

KfW 297 funds climate-friendly new builds only. The minimum standard is Effizienzhaus 40; with the additional QNG sustainability seal the maximum loan amount goes up.

• Maximum loan: up to €100,000 (tier 1) or €150,000 (with QNG)
• Rate advantage: up to ~3 % below market — historically one of the cheapest subsidy programs
• No repayment grant, but an extremely low rate
• Target audience: builders who already plan a high energy standard

If you are weighing whether the extra construction cost for EH 40 + QNG pays off, the KfW 297 calculator lets you put both variants side-by-side.

KfW 300 — Home Ownership for Families

KfW 300 is the strongest program if you have children and either build new or buy for the first time. The rate advantage is the largest of any KfW program — up to 4 % below market — and the maximum loan is the highest.

• Maximum loan: up to €270,000
• Income limit: taxable household income ≤ €90,000 + €10,000 per additional child
• Requirements: at least one minor child, owner-occupancy, no prior ownership
• Energy standard: at least Effizienzhaus 40

A family with two kids and €85,000 of income can use the full envelope. The 30-year impact becomes obvious in the KfW 300 calculator.

KfW 308 — Young Buys Old

KfW 308 targets families who buy an existing property and renovate it afterwards. You get a discounted rate — but you commit to bringing the building up to Effizienzhaus 85 EE within 4.5 years.

• Maximum loan: up to €150,000
• Rate advantage: ~3 % below market
• Renovation obligation: EH 85 EE within 4.5 years — or the subsidy is clawed back
• Target audience: families taking over an older home

Tip: KfW 308 can often be combined with KfW 261 — purchase subsidized, renovation subsidized. Run the combined effect in the KfW 308 calculator.

KfW 124 — Home Ownership Program

KfW 124 is the broadly-available, no-frills program: no hard energy requirement, no family condition — only the rule that the property must be owner-occupied.

• Maximum loan: up to €100,000
• Rate advantage: small (~0.1 %), in exchange for a low barrier
• Owner-occupancy required
• Common use: first-time buyers who want to top up their equity

KfW 124 is rarely the star, but often the pragmatic building block — especially in combination with the bank loan. See the impact on your payment and remaining debt in the KfW 124 calculator.

KfW 134 — Cooperative Housing

KfW 134 is the specialist: subsidized financing for the acquisition of cooperative housing shares for owner-occupancy — for people joining a Wohnungs­genossenschaft and living there.

• Maximum loan: up to €150,000
• Rate advantage: ~1.5 % below market
• Repayment grant: 15 % of the loan amount
• Requirements: owner-occupancy, registered cooperative

On a €100,000 share that already amounts to €15,000 of free money. The full payoff path is in the KfW 134 calculator.

At-a-glance comparison

Embedding KfW correctly into your bank loan

The KfW tranche is only half the story. Three concepts decide whether the overall structure holds up:

• Nominal rate (Sollzins) — the bank's pure interest rate, before fees.
• Effective rate (Effektivzins) — the honest comparison rate that includes processing costs.
• Fixed-rate period (Zinsbindung) — how long the bank and KfW rates stay locked. KfW programs have their own fixed-rate windows, typically 10 years.

When the fixed-rate period ends, you refinance — see follow-up financing. A repayment rate on the KfW loan that's too high can leave the remaining debt unevenly distributed at the end of the fixed period; one that's too low stretches the term unnecessarily. The blended-financing calculator is built exactly to expose that trade-off.

Worked example: family with a renovation case

Setup: a family buys an older house for €450,000 and brings €90,000 of equity. They combine:

1. Bank loan: €210,000 at 3.7 % nominal, 10-year fixed period, 2 % repayment
2. KfW 308 (Young Buys Old): €150,000 at 1.12 %, with the EH 85 EE renovation commitment

Blended rate ≈ (210,000 × 3.7 + 150,000 × 1.12) / 360,000 ≈ 2.62 %.

Compared to a pure €360,000 bank loan at 3.7 %, the family saves a five-figure sum in interest over the first 10 years — before KfW 261 is even added on top for the later renovation. Run the scenario yourself in the KfW 308 calculator.

Common mistakes

• Applied too late. KfW applications go in before the contract is signed — never reverse the order.
• Underestimating the energy standard. EH 40 vs. EH 55 decides the subsidy size for KfW 297 and KfW 300 — and the construction-cost premium has to pencil out.
• Forgetting the repayment grant. It is not cashback — it reduces remaining debt at the end of a phase. The calculator wires it in; the gut feeling tends to skip it.
• Ignoring the renovation obligation. Anyone drawing KfW 308 and missing the EH 85 EE deadline within 4.5 years has to repay the subsidy.
• KfW repayment too low. The KfW tranche rarely ends at the same time as the bank loan — its remaining debt has to fit into the follow-up financing.

Run your own numbers

Each program has its own calculator — with rate path, remaining debt, and blended rate:

• KfW 261 — Renovation loan
• KfW 297 — Climate-friendly new construction
• KfW 300 — Home ownership for families
• KfW 308 — Young Buys Old
• KfW 124 — Home Ownership Program
• KfW 134 — Cooperative Housing

If you want to put KfW directly against a bank loan, the blended-financing calculator is the right entry point. For background on individual terms, see the glossary.