How do I file US taxes as a citizen abroad? It's asking me for a US billing address, and I don't have one

[mark-blaauwhara]

We live in Canada and had no income in the US in 2024. We just need to fulfill our tax obligations.

[SusanY1]

US citizens must report all of their worldwide income annually, not only the income earned in the US.  You will need to file a return if meet the filing thresholds, even if the income is from Canada.  

You may be able to exclude your earned income from work and/or take a credit against any US tax calculated for taxes paid to Canada on the same income.  You can use whichever of these methods (or in some cases a combination of them) that gives you the best result. 

Learn more about this topic here: Filing Taxes While Overseas.