How much extra you will pay in stamp duty after the deadline THE stamp duty holiday is ending and many homeowners are rushing to get their sales approved before the March 31 deadline. Under this temporary rule, no stamp duty tax is paid on the first £500,000 of a property sale. However, if you were planning to put an offer on a house now you might be out of luck and end up missing out on the stamp duty holiday- even though the deadline is still a month away. According to Zoopla’s Head of Research, Gráinne Gilmore, it’s currently taking up to four months to process purchases.