Regarding the formal diet, you need to be on the exclusion diet for 8 weeks before attempting to reintroduce foods. This takes about one year to do properly. You will still experience unexplained flare ups. I would not suggest attempting the fodmap diet in the UK without speaking to a nutritionist first. You will need a go referral.
The AMT is the excess of the tentative minimum tax over the regular tax. Thus, the AMT is owed only if the tentative minimum tax is greater than the regular tax. The tentative minimum tax is figured separately from the regular tax. In general, compute the tentative minimum tax by:
In other words, it is the difference between total output tax and total input tax. Here input tax refers to a tax on inputs, i.e. local purchases made from a registered dealer whereas output tax means a tax on outputs i.e. tax on sales made within the state. VAT is an acronym used for Value Added Tax.