Treasury Minister Alex Allinson says he doesn't know how much a 2 per cent rise in income tax, ringfenced for healthcare, has raised.
He faced a question for written reply from Douglas North MHK John Wannenburgh about the rise imposed last year.
Dr Allinson said Treasury had estimated the rise would generate around £20 million of extra income tax.
But he said until all last year's tax returns had been submitted, it wasn't possible to give an exact figure.
Former Motor Museum goes on the market
No Onchan Park plan, say commissioners
Laxey campsite to get campervan improvements
Local authority: don't suffer in silence at Xmas
Government reminder over salt bins
Weather warning in place for high tides
White Boys touring Island today
Road closed after crash