TOKYO--The Bank of Japan on Thursday kept its policy on hold and stuck to its optimistic economic assessment despite a dramatic slowdown in economic activity after the government raised the sales tax in April.

The Japanese economy is veering further away from the central bank's rosy growth projections as additional tax burdens worth some $80 billion send household spending plummeting, raising doubts over Prime Minister Shinzo Abe's growth-revival plan.

But in a statement released after a two-day policy meeting, the central bank's nine-member policy board reiterated that the world's third-largest economy "continues to recover moderately." The only area that it downgraded in its economic assessment was housing.

As was widely expected, the board led by Gov. Haruhiko Kuroda unanimously voted to keep monetary policy on hold. The BOJ will continue with its policy of buying Yen60 trillion to Yen70 trillion in government bonds--the equivalent of 70% of newly issued JGBs--as well as other assets every year to keep the economy awash with cash, looking to eradicate over a decade of deflation.

The decision to stand pat demonstrates officials' confidence that they will be achieve their stated 2% inflation target by sometime next year, despite the growing skepticism of private economists. Officials have promised to ramp up easing program only if they are certain that they will miss the price goal.

The bank's leadership believes that the price goal is achievable as long as the economy grows above a modest 0.5% annually. Japan's supply constraints, such as a shortage of workers in the construction and services industries, mean that the jobs market will tighten further even if growth remains moderate. Companies will raise paychecks to attract qualified workers, which will spur consumption, officials say.

At his regular post-meeting news conference that will be held Thursday afternoon, Gov. Haruhiko Kuroda will likely face a grilling from reporters over why inflation has to accelerate from late this year, as projected by the BOJ, when the economy is expanding at a much slower rate than estimated by the central bank.

The Japanese economy contracted sharply in the quarter through June, as household spending fell at a record rate following the increase in the national sales tax rate to 8% from 5% on April 1. Spending dropped by some 6% in July, causing inventories to build up at auto makers and dealing a blow to the housing market.

Private economists slashed their Japanese growth projections for the year through March to 0.5% recently in response to a slew of gloomy indicators. That is half of what the BOJ forecast in early summer. Central bank officials will likely have to revise down their growth forecast in late October, when the bank releases its three-year growth and price outlook, although they are expected to stick to their bullish price projections, according to people familiar with the matter.

Toko Sekiguchi contributed to this article.

Write to Takashi Nakamichi at takashi.nakamichi@wsj.com and Tatsuo Ito at tatsuo.ito@wsj.com

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