For a simple business with clean bookkeeping and standard-rated sales, a VAT return is not difficult — the software produces the figures and you check and submit them. The difficulty is not the return itself. It is knowing whether the underlying transactions have been treated correctly in the first place.
Mechanically, VAT returns must be filed under Making Tax Digital using compatible software, with a digital link from your records through to the submission. Bookkeeping software handles the boxes and the filing. You still need to review what it has produced rather than submitting it unread.
The genuine complexity sits in the classification. Whether a supply is standard-rated, reduced-rated, zero-rated, exempt or outside the scope. Whether input VAT is recoverable at all — entertaining and cars are common traps. How to treat imports, exports, services bought from overseas suppliers, the reverse charge in construction, partial exemption, deposits and part-exchanges. Getting those wrong produces a return that looks perfectly tidy and is still incorrect.
Asset finance is another place people go wrong. VAT on a hire purchase agreement is typically charged up front on the asset price, whereas on a lease it is usually charged on each rental. That timing difference changes when you reclaim and can move a large amount of VAT between periods. Your accountant should confirm the treatment for the specific agreement.
If the up-front VAT on an asset purchase is the obstacle, short-term VAT funding is sometimes used to bridge the gap until the reclaim comes through. That is a credit facility, subject to status, and is not guaranteed.
This is general information, not tax advice. Confirm your own position with your accountant or HMRC.