Joint bitcoin wallet: who owns the coins for tax purposes?

Transferring bitcoin to a joint marital wallet: who the coins are attributed to for tax

A married couple manage their bitcoin together on a hardware wallet. Both know the seed, both can initiate transactions. Does that automatically mean each spouse owns 50 percent of the bitcoin?

For tax purposes the answer is: not necessarily.

In Austria, attributing an asset turns in principle on beneficial ownership and on the overall picture of the actual circumstances.

Technical access alone does not decide the question

The fact that both spouses know the seed or private key does not in itself prove ownership is split in half for tax purposes.

What can matter includes:

• who bought the bitcoin,
• whose assets financed the purchase,
• who is allowed to decide on sales,
• who benefits economically from gains and losses,
• what arrangements exist between the spouses.

The Austrian Administrative Court ties beneficial ownership in particular to the actual ability to dispose of an asset and to exclude others from interfering with it on a lasting basis.

Moving your own bitcoin to a joint wallet

Suppose spouse A has owned 1 BTC for years and moves it to a new hardware wallet whose seed spouse B will also know in future. The technical transfer to a new wallet on its own need not amount to a gift.

If A remains the sole beneficial owner and B merely gains technical access for administration or backup, the attribution for tax can continue to rest with A.

Different when half is genuinely transferred

If, by contrast, B is actually to receive half of the bitcoin and to dispose of that share freely in future, a transfer of assets may exist in economic terms. It then has to be examined whether a gift of 0.5 BTC has taken place.

With gifts between spouses the Austrian duty to report gifts can in turn become relevant once the statutory value thresholds are exceeded.

Keeping the tax history cleanly separated

A joint wallet can become particularly awkward where both spouses already hold their own bitcoin with different acquisition costs.

An example:

• A contributes 0.5 BTC with acquisition costs of 5,000 euros.
• B contributes 0.5 BTC with acquisition costs of 20,000 euros.

Merging them technically on one wallet should not lead to the different tax histories becoming impossible to follow.

On later sales the acquisition date and the cost basis can become decisive.

Which is why your own records matter

It makes sense to keep:

• the original wallet addresses in each case,
• the owner of each holding,
• purchase dates,
• acquisition costs,
• the date of the merger,
• an internal ownership agreement,
• later sales and withdrawals.

A joint hardware wallet should not be confused with a joint bank account.

Conclusion

Bitcoin on a joint marital wallet does not automatically belong to both spouses in equal shares for tax purposes. What counts is beneficial ownership: who can actually dispose of the bitcoin, and to whom are the opportunities and risks of the holding economically attributable? If the transfer is deliberately intended to pass ownership to the other spouse, a gift may additionally be involved.

(As of October 1, 2026. This article is not investment advice. Prices and fee structures change; check the terms with the provider before you buy.)