Who pays the penalty if AI software gets my tax return wrong?

Who pays the penalty if AI software gets my tax return wrong? You do. HMRC charges penalties to the taxpayer, not the software. If you took reasonable care there is no penalty; a careless error costs 0% to 30% of the extra tax, so check every figure before your 2026-27 return goes. Not as a defence on its own. HMRC's penalty factsheet says that if you ask someone else to do something for you, you must still do everything you reasonably can to prevent inaccuracies. What counts is whether you took reasonable care. No. HMRC's factsheet says that if you took reasonable care, you will not be charged a penalty for the inaccuracy. You still pay any extra tax that is due. Between 0% and 30% of the extra tax due if you tell HMRC before it finds the error, and between 15% and 30% if HMRC finds it or you tell it later. HMRC can also suspend a careless penalty for up to 2 years. Read the full answer, with every source, at rightotax.co.uk.