If it's an
existing (i.e. 'assigned') lease, with a lease premium not exceeding �150,000, and with an annual rent of less than �1000, SDLT ('stamp duty') is not payable.
If it's an assigned lease, with a lease premium not exceeding �150,000, and with an annual rent of �1000 or more, SDLT is 1%
If the lease premium on an assigned lease exceeds �150,000, the annual rent is irrelevant . For a lease premium up to �250,000, SDLT is 1%. Above that, up to a lease premium of �500,000, SDLT is 3%. For lease premiums exceeding �500,000, SDLT is 4%
For
new leases the above rules still apply but,
additionally, SDLT may be charged on the rent. If the 'net present value of the rent payable' (which is HMRC's estimate of the total amount of rent which will be paid during the life of the lease) is less than �150,000 no SDLT is payable on the rent. If the figure is higher, SDLT is charged at 1% of the value which exceeds �150,000.
http://www.hmrc.gov.uk/sdlt/index.htm
Chris