Auction purchases

VAT and the Modern Method of Auction

PropertyVAT Team · Updated 21 October 2026 · 3 min read

The modern method of auction — also called conditional auction — changes the mechanics of commitment. For a VAT-affected purchase, that shifts the risk rather than removing it.

How the two methods differ

The headline difference is time. The modern method typically gives a reservation period to exchange, then a further period to complete.

Why the extra time matters for VAT

The binding constraint on a VAT-affected auction purchase is rarely the funding. It is VAT registration, which takes weeks and cannot be rushed.

Under a traditional auction, a buyer who is not registered when the hammer falls is often stuck. Under the modern method, the longer runway may be enough to get registration in place before exchange and completion.

That is a genuine advantage, and for an unregistered buyer it can be the difference between a workable deal and an unworkable one.

It also gives room to:

• Obtain proper VAT advice on the contract
• Notify an option to tax, if a TOGC is intended
• Arrange funding without a 28-day squeeze

Why it is not a free pass

The reservation fee is usually non-refundable. That is the catch. Walk away after discovering VAT you cannot fund, and the fee is typically gone — even though you never exchanged.

So the fee behaves like a smaller, earlier deposit at risk. Smaller than 10%, but lost on a lower threshold of failure.

The fee may be in addition to the price. On a traditional auction the deposit counts towards the purchase. A reservation fee often does not, which changes your all-in cost.

The fee itself may carry VAT, depending on what it is for. Check the terms.

The legal pack is still the authority. More time to read it does not help if nobody reads it.

The arithmetic still runs on the pessimistic case

Before reserving:

Purchase price
+ VAT at 20% (if it applies, or might)
+ SDLT on the VAT-inclusive figure
+ reservation fee (often not credited against the price)
+ legal fees and searches
= your true all-in cost

The reservation fee line is the one people omit, because it feels like a booking rather than a cost.

What to do during the reservation period

Use it, rather than treating it as breathing room:

1. Have the legal pack reviewed immediately — day one, not week three
2. Start VAT registration straight away if the entity is not registered
3. Confirm the VAT position in writing from the contract
4. Notify an option to tax if a TOGC is intended
5. Arrange funding in principle for the VAT
6. Recalculate the all-in cost once the VAT position is confirmed

A reservation period spent waiting is a reservation period wasted. The clock on registration is the same length whichever auction method you used.

Which method suits a VAT-affected purchase

Traditional suits a buyer who is already VAT registered, has checked the pack, and has funding in principle. The speed is an advantage and the deposit is not at meaningful risk.

Modern method suits a buyer who needs time to get registered or to take advice — provided they accept that the reservation fee is the price of that time and is unlikely to come back.

This guide is general information, not legal advice. Auction terms vary — have a solicitor review the specific contract and reservation agreement before committing.