High Income Child Benefit Charge - Calculator vs Actual Charge

Hi I used the online calculator to work out what I would owe for my 2 children. Calculator says £263. I then completed the self assessment and I see I owe £326.60. Why the difference? 2 kids, PAYE only, not claiming part years for either?

Hi

It is possible you have had expenses or benefits in your code but the actual amounts now due are higher than in your code.

Thank you