Thanks for your question - I am Sam and I am one of the UK tax experts here on Just Answer.
You advise that this was a holiday let - but so I can establish if further tax reliefs are due can you advise whether the following remit has been met for this tax year (and last tax year 2013/2014)
1 The availability condition (availability test/threshold) – during the period
the accommodation is available for commercial letting as holiday accommodation to the public for at least 210 days (140 days for 2011–12 and earlier).
2 The letting condition (occupancy test/threshold) – during the period
the accommodation is commercially let as holiday accommodation to the public for at least 105 days (70 days for 2011–12 and earlier).
3 The pattern of occupation condition – the accommodation must not
be let for periods of longer-term occupation for more than 155 days during the year.
if this remit is met - then whilst the capital gain position is the same to calcualte - the charge is only 10%
So the gain is the sale price less the purchase price - which is £280,000 less costs to buy and sell (so legal and any state agent fees) less the capital improvements - you advise that you spent £60K - but without the invoivces or evidence of the spend - then this cannot be claimed - so you may wish to try and see if you can find any evidence of the spends.
Then the remianing gain is split 50:50 between you and your wife and you each have the first £11,000 exempt (the annuale xemption allowance) and any remining gain is then charged as follows.
If this can be treated a genuine furnished holiday let to the date of sale then 10% capital gains (under the entreprenuers relief charge) and if not
Then you as a higher rate taxpayer will have your share of the gain at 28% and your wife can have the first £31865 of the gain at 18% and furtehr gain at 28%.
You should alert HMRC to the sale once it has finalised, so that they are aware of the declaration you are to make, and so they can arrange to set your wife up within self assessment so she can declare her half share.
The fact you have swapped the splits ofownership over the years has no bearing -
Let me know if you wish any clarification on my response