The Commons handed over responsibility for running expenses in May 2010 More than £3.2m in expenses was paid out to MPs in the first two months of 2011, according to official figures.
Almost 25,000 claims were submitted in January and February, but 84 MPs had a total of £4,633 they asked for rejected by Ipsa, the independent regulator.
Among those who did get paid was former Labour MP Eric Illsley who was jailed in February for expenses fraud.
Ipsa also said MPs had spent £880,000 on official payment cards – similar to credit cards – since May 2010.
The cards – which have a monthly credit limit of £4,000 – were originally meant to pay for travel alone, but can now also be used for hotels, utilities and other bills.
BBC Radio 5 live’s political correspondent Chris Mason said the figures should be treated with some caution because the totals relate to claims handled in the two-month window, rather than expenses actually run up in that period.
He also pointed out that a number of the rejected claims were thrown out on the grounds of administrative errors or technicalities.
In one case, Lib Dem Transport Minister Norman Baker had a £15 bill for a “restaurant meal” turned down because it was not categorised as a legitimate expense.
The reason was that MPs can claim for dinner if the House of Commons sits later than 7.30pm and on the day in question, it rose at 7.29pm.
Overall, the most common reason for claims being rejected was “insufficient evidence” – in other words, non-provision of receipts or tickets for travel.
Ipsa said Illsley was entitled to claim expenses up until the point he was no longer an MP.
He controversially refused to resign his seat after pleading guilty to expenses fraud on 11 January, only relinquishing it on 8 February, two days before he was jailed.
In total, Illsley was paid £6,766 for January and February, including £2,000 for photocopier hire on 20 January – more than a week after he admitted his guilt.
Ipsa was created after the expenses scandal in 2009.
Its rules was relaxed in March following complaints from MPs that it was too bureaucratic and “anti-family”.
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