If I use the same Bitcoin address twice, can payments be linked?

The answer

Yes. Address reuse makes it much easier to associate two receipts with the same on-chain destination, even when the sender identities are unknown.

What to do next

Use a fresh verified receiving address for each new payment when your wallet supports it, and avoid publishing a permanent address unnecessarily.

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Does address rotation make Bitcoin anonymous?

No. Transaction patterns and input combining can still create public links.