Registering for VAT does not start the clock from zero on what you can reclaim. There is a window before the effective date of registration in which VAT you were charged is still recoverable, and it goes on the first return. It is regularly missed, because it means going back through invoices from a period when nobody in the business was thinking about VAT at all.
Two windows, and they are different lengths
Goods: normally reclaimable if bought in the four years before registration and still held by the business at the effective date, either as stock or as assets still in use. Services: normally reclaimable if received in the six months before registration. The difference reflects what the rule is protecting against, which is claiming input tax on things already consumed outside the VAT system. A laptop bought three years ago and still in use qualifies; three years of consumed accountancy fees do not.
What still has to be true
The purchase must relate to the business now registered, you must hold a valid VAT invoice for it, and the normal blocks still apply: no business entertainment, no cars with private use, no reclaim to the extent of private or exempt use. Goods sold or scrapped before the effective date are gone, as are goods used up making supplies before registration. Keep the working: it is a schedule that supports an unusually large box 4 on a first return, which is exactly the sort of figure that gets looked at.
How it reaches the return
It goes into box 4 on the first return alongside the input tax for the period itself, with the net values in box 7. There is no separate form. Because a first return often shows a repayment rather than a payment as a result, expect it to take slightly longer to be processed and keep the schedule and the invoices ready. The registration certificate's effective date of registration is what the four years and six months are measured back from, so start there rather than from the date the number arrived.
Questions people ask about pre registration vat
How far back can I reclaim VAT before registration?
Normally four years for goods still held by the business at registration, and six months for services received before it.
Do I need invoices for pre-registration VAT?
Yes. The usual evidence rule applies: a valid VAT invoice showing the supplier's registration number, the date, the supply, the rate and the VAT.
Where does it go on the return?
Into box 4 on your first return, with the net values in box 7. There is no separate claim form, but keep the schedule that supports it.