UK faces unsustainable debt burden unless taxes rise, watchdog warns
* OBR says UK debt could hit 320% of GDP by 2070s
* Ageing population and decarbonisation raise costs
* Risk of long-term higher defence and energy bills
* Government must fill budget hole from loss of fuel duty
* New UK finance minister under pressure to cut taxes (Updates after OBR briefing)
By David Milliken
LONDON, July 7 (Reuters) - Britain faces an unsustainable debt burden more than three times its current level unless future governments raise taxes to fund increasing costs from an ageing population and falling revenue from taxation on motor fuel, a watchdog warned on Thursday.
Britain's Office for Budget Responsibility (OBR), a government agency, said debt was on course to reach more than 320% of gross domestic product (GDP) in 50 years' time - up from 96% or 2.4 trillion pounds ($2.9 trillion) currently - if successive governments failed to tighten fiscal policy.
"The pressures of an ageing population on spending and the loss of existing motoring taxes in a decarbonising economy leaves public debt on an unsustainable path in the long term," the OBR said.
Britain's government has pledged to ban the sale of new petrol and diesel-powered cars from 2030. Fuel duties are currently a big source of tax revenue, while household electricity is fairly lightly taxed.
The watchdog's report just before Prime Minister Boris Johnson announced his resignation, sparking a contest for the Conservative Party leadership in which candidates will be under pressure to promise tax cuts.
"Tax cuts can of course be financed by spending reductions. But if they are financed by greater borrowing then, yes it puts more pressure on and arguably comes with additional risks in an economy that is running with high inflation," OBR board member Andy King told reporters.
OBR chair Richard Hughes said his main message to Britain's new finance minister, Nadhim Zahawi, was to prepare for unpredictable fiscal shocks such as the recent, hugely costly, COVID-19 pandemic.
The OBR's baseline forecast shows debt as a share of GDP falling over the next 20 years - partly due to short-run gains from a lower birthrate and slower increases in life expectancy - before rising to 267% of GDP in 50 years' time.
To return to pre-COVID debt ratio of 75% of GDP would require extra tax rises or spending cuts of 1.5% of GDP or 37 billion pounds every decade for the next 50 years, the OBR said.
Adding in the type of economic shocks that have hit Britain's economy since World War Two, and the debt burden would rise above 320% of GDP without corrective action.
The deteriorating global geopolitical situation - exemplified by Russia's invasion of Ukraine - could push debt even higher, the OBR said.
Debt could hit 430% of GDP in 50 years' time if Britain raised defence spending to 3% of GDP from 2%, suffered a big one-off hit from a cyber-attack and faced persistent damage from a global trade war. ($1 = 0.8347 pounds)
Reporting by David Milliken, Editing by Andy Bruce and Tomasz Janowski
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