The NAR (National Association of Realtors) reported that sales of existing homes rose 6.8 percent in March as more buyers took advantage of the homebuyer tax credit, a government incentive program that expires next week.

Since the existing home sales data does not reflect contract signings but, rather, completed transactions and the upcoming expiration of the tax credit is for the former, not the latter, there should be three more months of relatively strong sales in April, May, and June.

With mortgage rates still quite low at just over five percent for 30-year fixed loans and lower priced housing likely having reached a bottom in many parts of the country, conditions have never been better for many buyers.

Of course, the big question is what happens when the $6,500 to $8,000 government incentive goes away and interest rates revert to more normal levels. At the low end, these two factors dramatically improve affordability – by 20 percent or more.

NAR chief economist Lawrence Yun notes the following:

Sales have been above year-ago levels for nine straight months, and inventory has trended down from year-ago levels for 20 months running. The home buyer tax credit has been a resounding success as these underlying trends point to a broad stabilization in home prices. This is preserving perhaps $1 trillion in largely middle class housing wealth that may have been wiped out without the housing stimulus measure.

We’ll have to remember this outlook later on in the summer when, in the absence of free money from the government, home sales are expected to do what they did last fall when the first round of tax credits was about to expire – plunge.

What impact this will have on home prices remains the critical question.

Of course, it wouldn’t be surprising to see the tax credits extended again, that is, until all of future demand is pulled forward. Why stop now?

It should be interesting to see what happens with housing inventory as more sellers are likely to think “the coast is clear” and banks will no doubt be looking to unload some of their growing backlog. The current 8.0 months of supply in March was down from the 8.5 month supply in February.

Distressed sales accounted for 35 percent of the total and the share of first time buyers rose from 42 percent in February to 44 percent in March. Investors accounted for 19 percent of all transactions and 27 percent of sales were all-cash (still a very high level), both of these unchanged from the month before.

The next three months of data from the NAR will be closely watched and for good reason – failure to reproduce the sales surge seen last fall will be a clear indication that too much demand has been pulled forward while another impressive sales performance will instill confidence in the housing market.