TOKYO, Aug 4 (Reuters) - Japan's benchmark 10-year

government bond yield rose on Tuesday after a weak auction,

reversing earlier declines and heading for a one-month high, as

concerns over Japan's fiscal health and the central bank's

rate-hike path kept investors on edge.

The 10-year JGB yield rose 3 basis points

(bps) to 2.850%, after earlier slipping to 2.790%. Yields move

inversely to bond prices.

"Appetite for the 10-year bonds was dented because of the

uncertainties over sources of funding for the consumption tax,

while yields are under upward pressure (because of the Bank of

Japan's possible early rate hike)," said Yuki Kimura, a bond

strategist at Okasan Securities.

The auction's bid-to-cover ratio, a measure of demand, fell

to 2.56 times from 3.13 times at the previous sale, the lowest

since May 2025.

Its tail, the gap between the lowest and average accepted

prices, widened to 0.46, the highest in two years. A wider tail

signals weaker investor demand and indicates that buyers

required higher yields.

On Monday, JGB yields rose as some investors took joint

intervention by the U.S. and Japan to support the yen as a

signal for an accelerated pace of BOJ policy tightening.

Investors also remained concerned over Japan's fiscal

situation after the ruling party approved the government's plan

for a temporary cut in sales tax on food and beverages.

Bond prices were up earlier Tuesday because some investors

tried to reduce their short positions ahead of the auction, said

Takashi Fujiwara, chief fund manager at Resona Asset

Management's fixed income investment division.

The 20-year JGB yield climbed 1 bp to 3.695%.

The 30-year yield sank 2.5 bps to 3.955%.

The 2-year yield, the most sensitive to BOJ

policy rates, was flat at 1.56%. The 5-year yield

was flat at 2.085%.