Increase professional use of car

You can open a previous financial year, but you need to know exactly what you are doing, otherwise a number of things will no longer be correct. Be sure to print your diaries first so that you can use them as a backup. Simply adjusting your percentage to correct the expenses is not that difficult. If you also want to recover more vAT, you will have to calculate this yourself and fill it in manually on your next vAT declaration. I would not do this unless it involves a large amount. In any case, you can adjust the percentage for the next invoices. You can also adjust this percentage per invoice. For example, if you believe that a particular invoice is entirely for professional purposes.

Hello,

The most practical and logical thing to do is to apply the higher percentage from the new financial year onwards. As a self-employed person, that percentage can logically increase or decrease as your income increases or decreases.

Unfortunately, I don't think that's possible in Dexxter. The only thing that seems to be possible is to open the previous financial year back and adjust it. But then the adjustment also applies to the previous financial year and my (already submitted) 2023 tax return will no longer match the figures in Dexxter.