This is almost too good to be true for his opponents. SURELY he has an explanation, but on the face of things it appears he has made a hugely embarrassing mistake.
http://www.telegraph.co.uk/news/201...cing-questions-tax-return-amid-claims-failed/
To summarise, Corbyn today published his 15/16 tax return as a response to the Chancellor's refusal to publish his. The trouble is, it appears that he has failed to declare about £40k of income that he would have been expected to receive as Labour leader in 15/16 in addition to his MP's salary. The only way he can get out of this is if it turns out he refused to take the additional salary for being Labour leader, but there is no indication that this was ever the case. I'd say the most likely explanation is he/his accountant was too lazy to pay attention to the figures they were using on the Self Assessment form and overlooked the additional income somehow...which is a criminal offence.