Altersteilzeit is Germany’s phased-retirement model: from age 55 you halve your working time, the employer tops up your pay and pension contributions, and you glide — or, in the popular block model, jump — into retirement. The point most employees miss: there is no statutory right to Altersteilzeit, and in the block model you become your employer’s creditor for years of already-earned wages — which the law obliges the employer to protect against insolvency (§ 8a AltTZG), a protection you should actively verify. Altersteilzeit can be an excellent deal, but only if the entitlement basis, the top-ups and the security of your deferred pay are nailed down before you sign.
The mechanics under the AltTZG
The Altersteilzeitgesetz frames the model. Core conditions for a recognised Altersteilzeit arrangement (§§ 2, 3 AltTZG):
- You are at least 55 when the arrangement starts.
- You have been in insurable employment for at least 1,080 calendar days within the last five years.
- Your working time is halved compared to your previous weekly hours, and the arrangement runs until you can claim an old-age pension.
- The employer pays the statutory top-ups (below).
Crucially, the AltTZG does not grant you a claim: Altersteilzeit exists only where a collective agreement (Tarifvertrag), works agreement (Betriebsvereinbarung) or your individual contract provides for it. Many TVs and BVs create real entitlements — often with quotas (e.g., 3% of the workforce) and selection rules. Step one is always: find the applicable instrument and read its eligibility terms.
Block model vs. continuous model
- Continuous model (Teilzeitmodell): you work half your previous hours throughout — e.g., 20 instead of 40, or full days in alternating weeks — until pension start.
- Block model (Blockmodell): the dominant choice. Phase 1 (Arbeitsphase): you work full hours but are paid the halved Altersteilzeit salary. Phase 2 (Freistellungsphase): you stop working entirely and continue receiving the same pay. Distribution over up to three years is possible without further basis; longer arrangements — the classic 3+3 or 5+5 — require a collective-agreement foundation (§ 2(2) AltTZG).
The block model’s comfort hides a risk: during the work phase you earn value you are not yet paid — a Wertguthaben (value credit) the employer owes you through the release phase. That credit is the insolvency issue below.
The money: statutory top-ups and collective upgrades
During Altersteilzeit you receive the pay for your halved working time (Regelarbeitsentgelt), plus two statutory minimum top-ups from the employer (§ 3(1) AltTZG):
- 20% wage top-up on the Regelarbeitsentgelt — tax-free and contribution-free (§ 3 no. 28 EStG), though subject to Progressionsvorbehalt (it raises the tax rate on your other income).
- Additional pension contributions on at least 80% of the Regelarbeitsentgelt — so your pension account accrues at roughly 90% of your former level rather than 50%, cushioning the pension effect of half pay.
Because the 20% top-up is net-effective, the statutory minimum typically yields somewhere around two-thirds of your former net for half the work — the widely-quoted „70% net” is not a statutory guarantee but the product of the tax-free top-up plus, in many sectors, collective agreements that raise the top-up (to 30% and more, or to a defined net percentage such as 80–85%). Check your TV or BV for the real number; the spread between statutory minimum and collective upgrade is often several hundred euros per month.
§ 8a AltTZG: insolvency protection of your Wertguthaben — check it
In the block model, the employer must protect your accrued value credit (including the employer’s social-contribution share) against its own insolvency from the moment the credit exceeds three months’ Regelarbeitsentgelt (§ 8a(1) AltTZG). Two points employees must know:
- Not everything counts as protection. Suitable instruments are bank guarantees, surety insurance (Kautionsversicherung) or trust models (CTA). Expressly insufficient: group-company guarantees between affiliated companies and mere balance-sheet provisions.
- You are owed proof. The employer must demonstrate the protection measures to you in text form with the first credit and every six months thereafter (§ 8a(3) AltTZG). If it fails to provide adequate security, you can demand security after a written request with a one-month deadline (§ 8a(4) AltTZG) — enforceable in court.
Interplay with your pension: deductions still apply
Altersteilzeit is a bridge to a pension, not a pension improvement scheme. If your Altersteilzeit ends at an early pension start — say, the Altersrente für langjährig Versicherte at 63/64 — the standard actuarial deduction of 0.3% per month of early claiming applies, permanently (up to 14.4%). The employer’s extra pension contributions during Altersteilzeit soften, but do not eliminate, the combined effect of half pay and early claiming. Before signing, obtain a pension projection (Rentenauskunft) for the planned start date and compare the deduction-free option (45 insurance years) if within reach. Also keep your company pension (bAV) in view: check how the plan treats halved salary — some plans keep contributions at the pre-ATZ level per collective agreement, many do not.
Exit, dismissal and disruption (Störfall)
- Dismissal protection is unchanged. Altersteilzeit contracts can only be terminated under general rules — and during the release phase, an operational dismissal is close to impossible to justify, since your work is already performed. Some collective agreements exclude ordinary termination during ATZ altogether.
- Premature end = Störfall. If the employment ends early (death, termination, agreed exit), the block model unwinds: the Wertguthaben must be recalculated and paid out — you worked more than you were paid, and the difference is yours or your heirs’.
- Aufhebungsvertrag caution. Terminating an ATZ by mutual agreement can trigger benefit blocking periods (Sperrzeit) and pension complications; the severance mathematics also change because part of „your” money is simply the Wertguthaben you already earned. Never sign without netting out the value credit separately from any severance — the framework is in severance calculation.
- Unemployment after ATZ is a construction-site of its own: the halved salary can depress the assessment base for ALG 1 if things go wrong mid-model; see ALG 1 for expats for how the benefit is computed.
Worked example
A production planner in Bonn, 58, earns €5,200 gross on 40 hours. Her employer’s works agreement offers a six-year block model (3 years work, 3 years release) with the statutory minimum top-ups.
- Pay during ATZ: Regelarbeitsentgelt €2,600 + 20% top-up €520 = €3,120, of which the €520 is tax- and contribution-free. Net effect: roughly 65–70% of her former net for the whole six years (illustrative; her TV would raise this if it applied).
- Pension accrual: contributions continue on €2,600 plus additional contributions on 80% × €2,600 = €2,080 — together contributions as if she earned €4,680, about 90% of her old level.
- Wertguthaben: by the end of the work phase she has performed 3 years of full work for half pay — a credit of roughly 36 × €2,600 = €93,600 plus the employer’s social-contribution share. Her employer must show her a bank-guarantee or trust-based security in text form twice a year; when proofs stop arriving in year 2, we demand security in writing — the employer produces an updated Kautionsversicherung within the one-month deadline.
- Pension start: she retires at 64 with 12 months of early-claiming deduction: 3.6% off a projected €1,850 pension = −€66.60/month — a figure she accepted knowingly after comparing a later, deduction-free start.
Frequently asked questions
Do I have a legal right to Altersteilzeit?
Not from the AltTZG itself. A claim exists only if a collective agreement, works agreement or your contract grants one — usually with age, tenure and quota conditions. If no instrument applies, Altersteilzeit is a pure negotiation; employers with restructuring needs are often more willing than employees expect.
Can my employer dismiss me during Altersteilzeit?
Only under the general rules — the KSchG applies fully, and many collective agreements add exclusions of ordinary termination. In the release phase, operational dismissals lack a credible basis because no employment need exists to eliminate. Any dismissal during ATZ deserves an immediate legal check; deadlines are short.
What exactly happens if my employer goes insolvent in my release phase?
Your salary claims for the release phase are, economically, deferred wages from the work phase. With proper § 8a security, the guarantee or trust pays them out. Without it, you are largely an unsecured insolvency creditor — recoveries are typically small percentages. That asymmetry is why the six-month proofs and, if necessary, the enforceable demand for security are not formalities.
Can I work a side job during the release phase?
Within limits. Side employment beyond the Geringfügigkeit threshold can jeopardise the recognised ATZ status and its benefits, and most ATZ agreements restrict additional work expressly. Have any planned side job checked against both the AltTZG rules and your contract before starting it.
Is the block model or the continuous model better for me?
The block model front-loads risk (Wertguthaben, insolvency, Störfall) but delivers a clean early exit from working life. The continuous model carries almost no deferred-pay risk and suits those who want to stay engaged with reduced load. Health, pension timing, employer stability and the collective top-up level decide — model both before choosing.