Assets
What is divided in the equalisation of accrued gains (Zugewinnausgleich)?
Not your assets, but your increase.
Under the statutory regime of the Zugewinngemeinschaft (community of accrued gains, § 1363 BGB) each spouse’s property stays separate – only what was added during the marriage is divided: Endvermögen (final assets) minus Anfangsvermögen (initial assets) (§ 1373 BGB). Whoever achieved the higher increase pays the other half of the difference (§ 1378 BGB). The cut-off date (Stichtag) for the final assets is service of the divorce petition (§ 1384 BGB).
You have to assert it actively. Unlike pensions, assets are not equalised automatically – without an application the court does not rule on it. Inheritances and gifts count towards the initial assets and remain exempt from equalisation (§ 1374 Abs. 2 BGB); their increases in value during the marriage, however, do count.