Does a DBA need to appear alongside my LLC name on agreements?

Typically no, you don't list both. If the DBA is properly registered under the LLC, the LLC is the legal entity and the DBA is just a trade name. But I've seen banks and some vendors get picky.

Curious what state the DBA is filed in? That can change the answer a bit.

I always put "LLC d/b/a Trade Name" in the signature block. It's a small extra line and avoids any ambiguity about who is actually bound. Doesn't expose your personal name at all.

Agree with RivetAndStone on the signature block. The only place I've had a real issue was a lease where the landlord's attorney insisted the DBA appear on the first page too.

Does the DBA itself even have to be registered in the state where the contract is signed, or just where the LLC is formed?

Usually where you're doing business, not just formation state. But enforcement varies.

To add: If you sign only as the DBA and the DBA isn't linked to the LLC on paper, a plaintiff could argue you're personally liable. That's the main risk I'd worry about. The signature block fix is the simplest tbh.

I've used just the DBA on invoices and PO's for years with no problem. Contracts I keep the LLC d/b/a format.

That makes sense., So basically never sign as the DBA alone if the contract is substantial.

Right. And if a counterparty drafts the agreement with only the DBA name, ask them to add the LLC. Most will. If they won't, that's a red flag.

One more thi ng: some states require the DBA to be on file before you use it in contracts. So check that first. Otherwise the d/b/a designation might not hold up.

This thrdad is helpful. I was about to sign a vendor agreement as just my DBA. Going to revise it.

Same. I hadn't thought about the personal liability angle.

Also worth noting: if you're using a registered agent, they don't need to be on contracts at all. That's separate from the DBA question.