Hello, I am Keith, one of the experts on Just Answer, and happy to help you with your question.
Sorry the system has completely lost my reply to your question. I cannot offer the phone service as I am answering you from a location 6000 miles from the UK so it would be a tad expensive. You are merely in the Dad's Army 'Don't Panic! situation.
If you have made an error in your tax return all you need to do is advise your tax office of any amendment needed to correct the position. It is as simple as that and you can do it by letter.
Now as to VAT that is handled by a different part of HMRC. If your aggregated turnover of standard, reduced or zero rated supplies exceeds 83K in any one year then you must register for VAT, charge it on your invoices, account for same, and, of course, reclaim any input tax suffered from business purchases of supplies and services.
I do hope that you have found my reply of assistance and helped set your mind at rest.
Yes, you will have to settle any output tax, but you have any input tax to reclaim plus, if your customers are themselves VAT registered, you can issue revised invoices including the tax, they can reclaim as an input and the only piggy in the middle will be you who will have to pay HMRC the tax collected on the revised invoices.
I can't offer the phone call service as I am replying to you from a location 6000 miles from the UK and it would be a tad expensive!,
You must register if your turnover reaches the 83K threshold in any one year, otherwise there is no requirement.
Thgank you for your support.