Japan's central bank scrapped on Tuesday its negative interest rate as it finally began unwinding one of the world's most aggressive monetary easing programs.

After announcing its first increase in 17 years, the Bank of Japan said it was changing its short-term policy rate from -0.1 percent to between zero and 0.1 percent.

Officials "assessed the virtuous cycle between wages and prices, and judged it came in sight that the price stability target of two percent would be achieved in a sustainable and stable manner towards the end of the projection period of the January 2024 Outlook Report", it said.

The bank also said it would call an end to other unorthodox policies including its yield curve control programme on bonds and the purchase of risk assets such as exchange-traded funds (ETFs) and Japan real estate investment trusts.

The Federal Reserve and other central banks yanked up rates to rein in galloping inflation after Russia's 2022 invasion of Ukraine.

But haunted by the country's "lost decades" of stagnation and deflation, the BoJ kept its main rate negative, as it has been since 2016. The last hike was in 2007.

Raising the rate will make loans more expensive for consumers and businesses.

It will also increase Japan's bill for servicing the national debt, which at around 260 percent of national output is one of the world's highest.

Because negative interest rates mean banks lose out by parking capital with the BoJ, the policy was aimed at encouraging them to lend to businesses and thereby jump-start the economy and inflation.

The BoJ has also spent vast amounts buying up bonds and other assets to pump liquidity into the financial system.

The policy has sharply weakened the yen against the dollar, which is good news for exporters but not for consumers as it made imports more expensive.

Inflation has been at or above the BoJ's target of two percent for almost two years.

But despite some tweaks around the edges -- such as more flexibility with regard to its target range for bond yields -- the main interest rate has remained negative.

This is because the BoJ wanted more evidence of a "virtuous cycle" of rising wages and inflation driven by demand and not temporary factors.

The final piece of the jigsaw appears to have come on Friday when Japan's largest trade union secured a wage hike of 5.3 percent from employers, the biggest since 1991.

"Japan's in the ballpark of what's needed to sustain two percent inflation domestically," Stefan Angrick at Moody's Analytics said Monday.

The BoJ was also set to scrap other unorthodox measures including its yield curve control programme on bonds and the purchase of risk assets, the Nikkei reported on Tuesday.

"We trust the BoJ," the paper quoted a source close to Japanese Prime Minister Fumio Kishida as saying. The decision "is in their hands".

But moving too aggressively could also see large volumes of capital attracted to Japanese assets, potentially destabilising financial markets.