Checkout is where address mistakes cost money. A rejected card, an undeliverable parcel, or a tax field that shows the wrong rate can all trace back to the address form.
Ask for the country first
The country determines the rest of the form. Ask for it before the street address so the labels and validation can adapt.
Keep billing and shipping separate
Do not copy the shipping address into billing without showing the user. A gift order or a corporate card can legitimately have two different addresses.
Do not promise tax from an address alone
Tax depends on the seller, the product, the destination, and local rules. An address can change the estimate, but it is not the whole calculation.
Questions
- It can reduce typing, but test the manual path too. Autocomplete can hide the field order and make it harder to correct a wrong suggestion.
- Two lines cover most cases: street and unit. Add a company or attention field only if your labels and carriers support it.
Should I use an address autocomplete?+
How many address lines do I need?+
Examples are synthetic. Do not use a generated address for identity checks, account registration, or delivery.