If I my husband's PC to my Apple license and he buys a new computer will it transfer?

Licenses never expire and they are good for as many as six family members living in the same household. A license may be used on as many devices of the same platform as a licensee uses. So your husband will be able to use the Windows license, even if he buys a new computer in a few months. There may come a time when operating system upgrades make an old version unusable, though, so if he (or you, for that matter) are using a discontinued version, you may have to obtain an upgraded version of 1Password. Major upgrades sometimes do require an additional payment.

The title of your post makes me want to be sure you understand that licenses are sold per platform, as well as per individual. Your Mac license won't allow your husband to run the Windows version. But there is a Mac-Windows bundle available from AgileBits that gives you a discount on the pair, which helps ease the pain a bit. If you bought your license for your Mac from the Mac App Store, you can send your Mac App Store receipt to support+licenses@agilebits.com with a request for bundle pricing for Windows. You'll get a discount that brings your total cost to the bundle price. Do include a link to this thread in that email, if you pursue this. And, you'll receive an automated reply with a support ticket number. It would also help if you post the ticket number back here in this thread. If your Mac license came from AgileBits, check their upgrade pricing, which you can do by clicking on the appropriate button in the AgileBits web store using the link I posted.