Marie Woolf, Whitehall Editor
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Alistair Darling is facing a Commons challenge this week over plans to increase car tax for millions of motorists.
MPs are to vote on a retrospective rise for drivers who have cars registered between 2001 and 2006.
The Tories have tabled an amendment to the final stages of the finance bill, which will be debated this week, to force the government to scrap plans to backdate the tax.
Forty Labour backbenchers have signed a motion opposing the tax, which they say will hit low-income families when fuel costs are spiralling.
Some are threatening to vote for the Tory amendment unless the whips give them firm undertakings that the decision will be reviewed by the Treasury this autumn.
Yesterday the Treasury denied that Darling was preparing a climbdown, despite indications at a recent meeting with backbenchers that there might be a rethink.
A Treasury spokesman said: “The chancellor did meet backbenchers but made no promises of any concessions.”
Darling’s hand could be forced if Labour rebels join forces with the Tories to try to scrap the changes.
Ronnie Campbell, Labour MP for Blyth Valley, who is leading the drive to get the government to think again, said he and other Labour MPs would be forced to vote with the Tories if the government remain intransigent.
“I want some guarantee that he [Darling] is acting on our argument to scrap it,” he said yesterday.
“If there is no commitment to review then we will have to vote for the Tory amendment.
It would be silly not to vote for the amendment if we agree with it.”
The Tories have calculated that more than 1m motorists will face increases of more than £200 under the plans, which will come into force next April.
Justine Greening MP, the Tory Treasury spokesman, who has tabled the amendment, said it was unfair that motorists were being penalised for decisions on cars they had bought before the tax changes.
She said: “It is unacceptable to introduce a tax on a pretence of changing people’s behaviour when that behaviour was in the past. This tax is nothing to do with the environment as the Treasury claims. It is everything to do with raising more cash.”

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Actually the govt. are getting very good at introducing retrospective taxes.
This is not the first tax they have tried to backdate a tax. What they are doing is illegal under Human Rights law! It means that you will never know your tax position because the goalposts can be moved in the future.
Simon, London,
"Until your average bloke can no longer afford to run a 2.0 litre car we won't see an end to congestion and pollution."
Not true. We're already being strangled by massive taxes on fuel, so how will retrospectively taxing middle and low income earners on cars they bought six years ago help?
Paul, London,
Being an OAP driving a car is a necessity but Darling wants us off the road by his exhorbitant tax increases.This governments attitude is " if it moves,if it dies,if it drives,if it stops,if it earns money then WE will tax it.We do not earn meggabucks with lavish expense accounts.
Peter Scott, Southend on Sea, U.K.
A simple solution - scrap car tax competely. Put a proportionate increase onto petrol. The higher petrol use; the higher contribution. High mileage drivers will pay per CO2 unit, and low users wil pay less. Pay as you go. Car tax dodgers will have no option but to pay their way.
paul gaskell, coventry, england
This is not a retrospective tax. People with gas guzzling cars are making a daily choice to keep them on the road instead of getting something smaller and more economical instead. Until your average bloke can no longer afford to run a 2.0 litre car we won't see an end to congestion and pollution.
C McDonald, London,
MP's have to go never mind Brown, I have not been on holiday since 1997, and wont be going any where any time soon, Thanks to brown.
Yet they swan round Europe living the good life Taxing the life out of us!
We need a Government of the people, by the people for the People, not of rich toffs!
MR W Jones, Liverpool, England
I Have just read in todays Times about MEPs having so called Binges across Europe in the pretence of meetings which is costings the taxpayer £100 of thousands ,this is where our money goes.
I believe a revolution is in order to rid ourselves of these criminal MPs
Mike B, Lincoln, uk
Its time to get rid of these's crooks,Gobal warming is a sham,just an excuse to steal money,we don't need this farce anymore,PM's Parliament,smoke and mirrors,
it time for a new direction
KENNETH BOWRY, LONDON,
Those MP's not rebelling are can either afford the rise, or are using pool cars or are claiming back through expenses.
seve tea, manchester, cheshire
Whats the point of working any more, why dont we all run up loads of debt and let the C A B offer £1 a month, lets join the rest and stop working????????
Jenny, manchester,
There really should be a mechanism in place to allow us to remove Rogue Governments, instead of having to wait for the next general election.
So much damage is being done by this Government, the lies deceit and fraud, not to mention broken promises and the signing of treaties without Consent.
Clive Burghard , LANCING, ENGLAND
If MPs are to vote on retrospective vehicle taxes, where will it end? Such a vote will set a precedent for all taxes to be reviewed and changed retrospectively. This should not be allowed to happen more stealth taxes, but backdated by 8 years!!!!
Richard, salisbury, England
Another tax grab that has gone wrong for Stalin Brown and his Scottish side kick, "Robbin" Darling. Brown got away with his tax pilfering for so long as TB was in the spotlight.Now its on him and the country doesn't like what is sees.
Time for him to go home.
Andy M, London,
All this moaning.
Just do want MP's do and put the cost on your expense claim form
Ray Harvey, Hitchin, uk
First of all the government fails to act years ago to install nuclear power stations to reduce our reliance on fossil fuels especially with the new hydrogen vehicles now being road tested by Honda, and now they want to tax the populace for their failings. Get this failed government out now.
B J Deller, Marbella, Spain
i bought a ford focus 2.0 saloon family car 9 years ago and all of a sudden i will have to pay more tax on it ? wont be long before they back tax me for petrol ive bought to run it for 9 years
steve eason, nottingham, uk
Why does this government think all people have money ? they are sucking the life blood out of the country with Direct Taxes and stealth Taxes, we cannot afford to live now so why are they intent on destroying everything we work very hard for? As one Twit said, we should all be Happy?? Yeah right.
John Hackett, Nr Louth, England
im to sick to think this england as gon for ever
ken, hernebay, england
we keep getting taxed but have nothing to show for it, oh silly me, i forgot it costs nearly a million pounds to keep each drug user happy, and of course there's the rise for mp's expenses for their "other "houses, and lets not forget the money we waste on scroungers every year, and the list goes on
cc, liverpool, uk