The Ministry of Defence wrote off more than £110 million in losses last year, including the cost of settling a dispute over furniture and donating helmets and body armour to Uganda.
The department's annual accounts also show that some £10.2 million of spending in 2010/11 was counted as "fruitless payments".
The losses come as the MoD is facing 17,000 job losses due to massive cuts in its £34 billion budget following the strategic defence and security review (SDSR).
The write-offs include a £1.7 million out-of-court settlement with a furniture company at the end of a contract.
A crash involving a warhead at the Naval Air Warfare Centre in China Lake, California, cost more than £1 million. The grounding of HMS Astute in Skye last October is expected to cost another £2.3 million, the accounts show.
This year's losses also include a "gift" of fibre glass helmets and body armour to the Ugandan government. It cost almost £1.7 million. Just over £57 million was written off as "constructive losses" - mainly cancelled projects.
As well as the £110 million lost in 2010/11, the accounts recorded further losses of £6.5 million which will be signed off in future years. They include the cost of scrapping Nimrod and the withdrawal of the Harrier fleet of jets - both announced by Defence Secretary Liam Fox in the SDSR.
TaxPayers' Alliance chief Matthew Elliott told The Sun: "MoD waste has been spiralling out of control for years, costing taxpayers an unbelievable amount of money while putting more pressure on budgets sorely needed to ensure frontline troops have the equipment they need.
"It's unbelievable that the MoD is still writing off billions of taxpayers' money. The figures for fraud, equipment losses and poor procurement decisions are eye-watering."
An MoD spokeswoman said: "As we acknowledged in our response to the NAO's (National Audit Office) report in June, the Ministry of Defence has not managed its resources well for many years. That said, the NAO has now rightly acknowledged that improvements have been made to the MoD's inventory processes."
