Is Zakat Owed on Wealth Gained Before Converting to Islam?

No, Zakat is only obligatory for Muslims. 

Any wealth acquired before embracing Islam is not subject to Zakat. 

Here is Why:

• Zakat is a Religious Obligation
• Zakat is a duty prescribed for Muslims as an act of worship and purification of wealth.
• Since it does not apply to non-Muslims, any wealth owned before converting to Islam does not incur Zakat.
• Zakat Becomes Due After Accepting Islam
• Once a person accepts Islam, they become responsible for fulfilling all religious obligations, including Zakat.
• However, the calculation of Zakat only begins after conversion, meaning past wealth is not taken into account for previous years.
• Nisab and Hawl Conditions
• Zakat is due only if one's wealth exceeds the nisab (minimum threshold) and has been held for a full lunar year.
• Since a non-Muslim is not liable for Zakat, the one-year holding period (hawl) starts after embracing Islam.
• No Retroactive Obligation
• Islam does not impose financial or religious duties retroactively.
• Even if a person possessed Zakatable assets before converting, they are only accountable for Zakat on wealth held after accepting Islam.
• When to Start Paying Zakat
• If a convert’s wealth meets the Zakat nisab after conversion, the one-year period begins.
• Once this duration is completed, Zakat is due on the eligible assets.

Hence, Zakat is not required on wealth before becoming Muslim. The obligation begins only after accepting Islam. 

And Allah knows best!