Bank of England policymakers said their first interest rate rise in over a decade was likely to be needed in the "coming months" if the economy keeps growing and inflationary pressures continue to build.
Bank of England officials voted 7-2 to keep rates on hold at a record-low 0.25% as expected.
But they said that their tolerance for above-target inflation was lessening and that all of them thought rates could rise faster than financial markets expect.
The UK's vote to leave the European Union in March 2019 has created long-term doubts about the health of the economy but also strong short-term inflation pressures.
"A majority of MPC members judged that, if the economy continued to follow a path consistent with the prospect of a continued erosion of slack and a gradual rise in underlying inflationary pressure then some withdrawal of monetary stimulus was likely to be appropriate over the coming months," the Bank of England said.
Sterling up as Bank of England says rates likely to rise in 'coming months' pic.twitter.com/ZED6hqyscI— RTÉ Business (@RTEbusiness) September 14, 2017
The Bank of England said the economy was doing a little better than it had expected last month, and that inflation was likely to exceed 3% in October - slightly above previous forecasts - after reaching 2.9% last month.
But it said it was "unclear how sustained any increase in GDP growth might be over the medium term", citing unknowns about how households and businesses would react to the Brexit process.
The Bank of England has previously signalled rate hikes ahead, only to be caught out by unexpected changes in the economy.
Economists polled by Reuters had mostly expected a 7-2 vote in favour of keeping the extra stimulus brought in in August 2016 when the economy appeared to be reeling from the shock of the Brexit vote.
But a minority had seen a chance that Bank of England chief economist Andy Haldane would join Ian McCafferty and Michael Saunders in backing an immediate increase in rates to 0.5%.
Haldane had said in June that he expected to support a rate rise later in 2017.
After performing better than the Bank of England expected in 2016, the UK economy slowed in the first half of 2017 to grow at roughly half its long-term average rate as the highest inflation in four years squeezes consumer demand.
However, the bank is concerned that Britain's ability to grow strongly over the medium term without generating excessive inflation has weakened.
It said the immediate surge in inflation above its 2% target is due to the fall in the pound after the Brexit vote.
Sterling fell to a nine-month low on a trade-weighted basis on August 29, though it has since recouped these losses and is little changed from its level at the time of the Bank of England's last rate decision on August 3.
This strengthening partly reflects growing market expectations of a Bank of England rate rise, which according to strategists are now priced in for around August of next year.
The Bank of England said that wage growth of 2.1% in the three months to July was stronger than it had expected, although it was still unclear if there would be the sustained pick-up it is forecasting.
Unemployment at a 40-year low of 4.3% is also a more positive development than the BoE had expected.
There is no news conference following this month's policy decision. Governor Mark Carney is due to give a major speech at the International Monetary Fund in Washington on Monday.