Income Limit for first home buyers tax credit

are there any circumstances for which buyers whose incomes are at or below the $75,000 limit for singles or the $150,000 limit for married taxpayers might not be able to claim the full $7,500 tax credit?

In general, the tax credit is equal to 10% of the qualified home purchase price, but the credit amount is capped or limited at $7,500. For most first time home buyers, this means the credit will equal $7,500. For home buyers purchasing a home priced less than $7,500, the credir will equal 10% of the purchase price.