If your income is not enough for a loan then your husband could guarantee the loan and still stay off title.
This is probably a good way to proceed:
1. Get a preapproval for husband to buy wife's share. Borrow 100% for this if possible, ie costs too. Get IO loan with 100% offset.
2. Do this while continuing to live in house
3. Get lawyer going and loan full approval.
4. transfer title. Get your cash paid to your bank account.
5. You transfer your cash into your husband's offset account.
6. Keep living there while you look for the new property. No tax issues as it is not rented
7. work out your finances and get a loan pre-approval if needed
8. Find new property
9. Buy new property
10. Put up existing home for rent while waiting to settle on new property
11. settle and move in.
I dont' see any tax issues - as long as you don't pay down the husband's loan and redraw it later etc.