Looking around www.irs.gov I found this:
Married and Co-Purchasing Homebuyers
Q. I am a long-time resident (have owned and used my current home as a principal residence for five consecutive years out of the eight-year period ending on the date of purchase of the new residence) but my spouse has lived there for only three years. Can we qualify for the long-time resident homebuyer credit if we purchase a new principal residence?
A. No. Both spouses must have owned and used the same previous principal residence for five consecutive years out of the 8-year period ending on the date of purchase of the new principal residence to qualify for the credit. (12/14/09)
Q. I am a long-time resident and current homeowner and my spouse is a first-time homebuyer (has had no ownership interest in a principal residence during the three-year period ending on the date of purchase of a new principal residence) and we purchased a new principal residence. Can we qualify for either the first-time homebuyer credit or the long-time resident homebuyer credit if we purchase a new principal residence?
A. No. Both you and your spouse must be first-time homebuyers in order to qualify for the first-time homebuyer tax credit. Since you had an ownership interest in a principal residence during the three-year period ending on the date of purchase, neither you nor your spouse qualifies for the credit. Similarly, both you and your spouse must be long-time homeowners of the same previous principal residence in order to qualify for the long-time resident homebuyer credit. Since your spouse is not a long-time homeowner of your current principal residence, neither of you qualify for the credit. (12/14/09)
Q. I am a long-time homeowner of a principal residence and my spouse is a long-time homeowner of a different principal residence. Can we qualify for the long-time resident homebuyer credit if we purchase a new principal residence?
A. No. Both spouses must have owned and used the same previous principal residence for five consecutive years out of the eight-year period ending on the date of purchase of the new principal residence to be eligible for the credit. Since you and your spouse owned and used different principal residences, neither of you qualify. (12/14/09)
Q. How does the allocation provision work when unmarried taxpayers purchase a home together and both qualify for the first-time homebuyer credit under different tests?
A. Co-purchasers who are not married may allocate the credit using a reasonable method. A reasonable method is any method that does not allocate any portion of the credit to a taxpayer who is not eligible for that portion of the credit. The maximum credit for a taxpayer who qualifies under the long-time resident test is $6,500, and the maximum credit for a taxpayer who qualifies under the first-time homebuyer test is $8,000. One example of a reasonable method is to allocate $6,500 to the long-time resident homebuyer and $1,500 to the first-time homebuyer. (12/14/09)
Married and Co-Purchasing Homebuyers
Q. I am a long-time resident (have owned and used my current home as a principal residence for five consecutive years out of the eight-year period ending on the date of purchase of the new residence) but my spouse has lived there for only three years. Can we qualify for the long-time resident homebuyer credit if we purchase a new principal residence?
A. No. Both spouses must have owned and used the same previous principal residence for five consecutive years out of the 8-year period ending on the date of purchase of the new principal residence to qualify for the credit. (12/14/09)
Q. I am a long-time resident and current homeowner and my spouse is a first-time homebuyer (has had no ownership interest in a principal residence during the three-year period ending on the date of purchase of a new principal residence) and we purchased a new principal residence. Can we qualify for either the first-time homebuyer credit or the long-time resident homebuyer credit if we purchase a new principal residence?
A. No. Both you and your spouse must be first-time homebuyers in order to qualify for the first-time homebuyer tax credit. Since you had an ownership interest in a principal residence during the three-year period ending on the date of purchase, neither you nor your spouse qualifies for the credit. Similarly, both you and your spouse must be long-time homeowners of the same previous principal residence in order to qualify for the long-time resident homebuyer credit. Since your spouse is not a long-time homeowner of your current principal residence, neither of you qualify for the credit. (12/14/09)
Q. I am a long-time homeowner of a principal residence and my spouse is a long-time homeowner of a different principal residence. Can we qualify for the long-time resident homebuyer credit if we purchase a new principal residence?
A. No. Both spouses must have owned and used the same previous principal residence for five consecutive years out of the eight-year period ending on the date of purchase of the new principal residence to be eligible for the credit. Since you and your spouse owned and used different principal residences, neither of you qualify. (12/14/09)
Q. How does the allocation provision work when unmarried taxpayers purchase a home together and both qualify for the first-time homebuyer credit under different tests?
A. Co-purchasers who are not married may allocate the credit using a reasonable method. A reasonable method is any method that does not allocate any portion of the credit to a taxpayer who is not eligible for that portion of the credit. The maximum credit for a taxpayer who qualifies under the long-time resident test is $6,500, and the maximum credit for a taxpayer who qualifies under the first-time homebuyer test is $8,000. One example of a reasonable method is to allocate $6,500 to the long-time resident homebuyer and $1,500 to the first-time homebuyer. (12/14/09)