The Department of Health and Social Care says it needs another £2.3 million to cover the costs of a Douglas care home.
In April, minister Lawrie Hooper will ask Tynwald to approve the extra cash.
Summerhill View on Victoria Road had a budget of just over £12.5 million, but actually cost £14.9 million.
Earlier this year, Manx Care revealed it would need an extra £1.5 million to employ the extra staff needed to run the 60-bed facility.
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