Just as an example, assume that a married couple has a modified adjusted gross income of $160,000. The applicable phaseout to qualify for the tax credit is $150,000, and the couple is $10,000 over this amount. Dividing $10,000 by $20,000 yields 0.5. When you subtract 0.5 from 1.0, the result is 0.5. To determine the amount of the partial first-time home buyer tax credit that is available to this couple, multiply $8,000 by 0.5. The result is $4,000.
Here's another example: assume that an individual home buyer has a modified adjusted gross income of $88,000. The buyer's income exceeds $75,000 by $13,000. Dividing $13,000 by $20,000 yields 0.65. When you subtract 0.65 from 1.0, the result is 0.35. Multiplying $8,000 by 0.35 shows that the buyer is eligible for a partial tax credit of $2,800.
Please remember that these examples are intended to provide a general idea of how the tax credit might be applied in different circumstances. You should always consult your tax advisor for information relating to your specific circumstances.