Ian Paisley Junior is among more than a dozen MPs who have had their Commons credit cards blocked after running up expenses debts of up to £27,000.
The DUP MP was £27,766 in the red when his card was stopped last November, and the deficit was £20,337 by last month.
Five SNP politicians – including Westminster leader Angus Robertson and deputy Stewart Hosie – were among those who were subject to action by the Independent Parliamentary Standards Authority (Ipsa).
Four of the party’s representatives have since repaid sums ranging from £33 to £3,446 in full.
Natalie McGarry, who has been suspended from the SNP amid allegations relating to missing donations, owed £2,270 when her card was blocked on January 25, according to the figures released to the Press Association under Freedom of Information rules.
She had £2,370 outstanding as of February 23.
Her office blamed a “mix up” and said the situation had now been “rectified”.
Shadow work and pensions secretary Owen Smith, former minister Liam Byrne and backbencher Simon Danczuk are on the list, having owed £953, £1,189 and £595 respectively.
The amounts have all since been cleared.
Commenting on the Ipsa action, on Friday Mr Paisley said the figures were a “snapshot in time position” rather than the full picture.
“This card is used exclusively for House of Commons travel expenses etc. It is cleared each quarter. To my knowledge it was not stopped last year.
“The information published appears to give a snapshot in time position. Last June when an issue arose it was quickly resolved and all invoices reconciled with the card,” he said.
Labour ex-policy chief Jon Cruddas was subject to action before Christmas over £2,967 of expenses.
Mr Cruddas said he exceeded the printing and postage budget for last year and had now agreed to settle the overspend by April 1.
Tory backbencher John Stevenson had his card blocked in December over £608 of debt, but has since settled the amount.
Fellow Conservative David Morris’s card was suspended the same month, when he owed £12,240. He said Ipsa had initially failed to process the transactions properly and later discovered an overspend in office costs of nearly £5,000.
“This overspend happened due to numerous admitted errors by Ipsa with their system, but under the scheme any budget overspends must be personally reimbursed by the member from their own pocket,” he said.
“This issue has now been resolved and the amount agreed as owed is being paid back by myself from my own pocket.
“I must stress that these expenses claimed for were all permissible claims and were legitimate office costs incurred by carrying out my parliamentary duties to my constituents.”
Ms McGarry’s office said her card was currently operational. “There was a mix up in the payment of the deposit for accommodation, but this has since been rectified, and Ipsa are satisfied with the repayment,” a spokeswoman said.
Ipsa issues MPs with credit cards to pay for a variety of items such as travel, accommodation and stationery.
The politicians then have to prove the spending was allowable within a month, or they build up debts to the watchdog.
The sums are recouped by suspending the cards and not paying out valid expenses claims, or in instalments from the MP’s salary.
The latest details date from the end of June, when a previous disclosure sparked a furious row between Work and Pensions Secretary Iain Duncan Smith and Ipsa about whether his card had been suspended over a £1,000 debt.
Some of the new cases involved disputed claims, with energy select committee chairman Angus MacNeil building up a £950 tab after charging a series of hotel bills for more than £250 a night. He insisted the rooms were the cheapest available, but has now repaid the difference above Ipsa’s £150-a-night maximum rate.
Angela Crawley is the only SNP MP listed as having had her card suspended and still being in debt as of last month, owing £2,152.
An SNP spokesman said: “By its very nature the operation of the expenses system means that Ipsa often owes outstanding amounts to MPs and MPs often owe outstanding amounts to Ipsa. Outstanding amounts are then repaid.”
The watchdog was challenged about the credit card rules by SNP MP Pete Wishart at a hearing of the Speaker’s Committee that oversees it this week.
Mr Wishart complained that having to provide evidence for spending within a month could be “burdensome” and highlighted that new SNP MPs had seen their cards suspended.
“Ipsa had made such a fantastic impression on our new groups of MPs when they were newly elected,” he said.
“There was goodwill towards Ipsa. Totally gone after that.”
But the watchdog’s chief executive Marcial Boo responded: “I am obviously very sorry that it has cost a lot of goodwill. But it is part of the role that we have to make sure that payments that we make are supported by evidence.
“As soon as MPs provide us with that evidence the card is turned back on again.”
He added: “We cannot allow ourselves to be in a position where an MP is making thousands of pounds of payments on a card and failing to give us evidence to support that payment, without taking any action.”
Mr Byrne said he was appealing after Ipsa refused to pay for leaflets to let constituents know about surgeries and other events.
“Ipsa is disputing whether they should pay for the invitations to residents’ meetings and leaflets with information about my surgeries,” he said. “But I think this is a point of principle.
“So, having discussed it with Ipsa’s chief executive, I’m taking it to tribunal. Ipsa does a really difficult and important job and I will always defend it.
“But, MPs need to be at the service of their constituents – and that means residents must know how to get hold of the people they elect.”