Bank-issued certificates of deposit rates are inching up, but if your one-year CD is maturing, you’re probably not going to like what’s being offered. That’s because CD rates took a dramatic drop in the past year as the Federal Reserve marched through a series of reductions starting last summer. The downward spiral was triggered by a belt-tightening credit crunch and a pervasive housing downslide.

Rates plunged as much as 325 basis points in the past year, dropping to as low as 2 percent from 5.25 percent.

Early last summer, it was not uncommon to see banks offering 5 percent interest or more on certificates of deposit. Then came the steady stream of rate cuts, and CDs were paying in the neighborhood of 2 percent. Now we’re seeing rates flirting with 3 percent, and teasers that are a tempting couple of percentage points higher.

Does the move to higher ground indicate that an economic turnaround has begun? Not necessarily, say banking experts.

“Rates are down considerably from what a consumer could have gotten last summer,” says Herb Kaufman, professor of finance and vice chair of the Department of Finance at Arizona State University’s W. P. Carey School of Business. “Now they’ve come back a little bit. They’re trending up as banks try to rebuild their deposit base and retain the deposits they have.”

Kaufman and Rick Robinson, regional investment manager for Wells Fargo Wealth Management Group, agree that one of the reasons for the modest increase is the perception that the Fed is not likely to reduce interest rates anytime soon. Another factor is inflation.

Robinson says the Fed is taking a wait-and-see approach to determine how the economy responds to seven rate cuts and whether inflation will remain somewhat subdued or will increase.

Kaufman notes that inflation, fueled by gasoline and food prices, appears to be accelerating.

“As that happens — and the feds are very conscious of that — you can expect banks will have to reflect the rise in inflation with their CD rates,” Kaufman says.

A significant improvement in the credit market adds to the likelihood of CD rates continuing to drift upward through summer, Kaufman says. He expects to see CD rates somewhat higher than they were last spring.

Is the inching up of CD rates a good or bad sign for the economy?

“I’d say it’s a little bit of a good sign,” Kaufman says. “It wouldn’t happen if the Feds weren’t comfortable with the credit market. Concerns have eased. Banks are comfortable to bid up rates, which means some of the constipation in the credit market has eased.”

The rise in interest rates could be tied to various factors.

“It’s usually a signal that the economy is beginning to do well or that the Federal Reserve wants to slow down the economy,” Robinson says. “Or it could mean that interest rates go higher because of supply and demand, because of inflationary pressures.”

But Robinson cautions: “A small uptick in rates is not a signal that we’re out of the woods or that economic growth is turning around. I still think it will be subdued in the second half of 2008. We expected low growth for the first portion of this year, and we expect to pick up the pace slightly in the second half.”

Another word of caution for investors: “Some banks might offer teaser rates of 5 percent for three months,” Robinson says, “but when it matures and resets, the rate will be consistent with what other banks are offering. Any bank in Arizona must remain competitive with the bank on the opposite corner.”

The creep upward of CD rates is a good sign for aging investors who rely on income from these investments to maintain their lifestyle. Conversely, the drastic decrease in rates since last summer was hurtful, especially for seniors.

“There is less money in their pocket,” Robinson says. “As their CDs matured, if they reinvested their money they’re more likely earning less than they earned previously. They have less to live on.”

Kaufman, too, says the increase is a good sign for retirees, so long as the rise does not pose a threat to economic recovery. Because of the roller-coaster ride the stock market has been on, some investors seeking a safe haven switched to CDs covered by the FDIC.

The collapse of investment bank Bear Stearns & Co. in March spawned some movement to CDs and safer, less volatile investments, including government-backed bonds. Robinson calls it “a flight to quality.”

“In the summer of 2007, banks went through a confidence crisis,” Robinson says. “Investors were worried. Some banks experienced an outflow of deposits, given investor concerns over their viability. That concern seems to have lessened. As the crisis grows longer, more information becomes available, which lessens the panic. People can understand the viability of their institution.”

The reason for the subtle increase in CD rates is anybody’s guess.

“Some banks might be willing to take a loss on deposits to shore up their capital base,” Robinson says. “They may want to increase deposits because they see opportunities to make loans. There are myriad reasons why rates go up, fluctuating in small increments of five to 10 basis points. It could be strategic or market related.”