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Bed and Breakfast, Same Day Capital Gains UK
The 'same day rule' in the UK is a rule for matching purposes only.  It says that sales on any day are matched firstly with purchases made on the same day for the purposes of ascertaining any gain/loss. Hence the phrase 'bed-and-breakfast' ('b&b') when you wish to crystalise a gain (that is within the exempt amount) and re-establish a purchase price at a higher level.  You do the sale on one day, just before the market closes, which gets matched with your original purchase, and then you buy the shares back the next day, just after the market opens.  This is standard tax-planning.  Whenever you have a paper gain, and you wish to lock that gain out of being taxed, you do a bed-and-breakfast transaction, the idea being to use up your annual exemption each and every year.  Of course, if your dealing costs are high, then they may outweigh any tax saved, and so it would be pointless. For the purpose of an example, let's assume that the UK tax year is the same as the calendar year. Scenario 1. Suppose I bought some shares in 2016, for a total price of Stg.50,000. Suppose by the end of 2016, the holding is worth Stg.54,000, resulting in a paper gain of Stg.4,000. Question.  Should I do a b&b transaction to make use of my Stg.11,100 annual exemption ? Answer.  Well, with transaction costs at 1.5% for a round-trip trade, suppose, and stamp duty on the purchase of 0.5%, your total costs for a b&b will be Stg1,080, and your tax saved (upon some future sale date) assuming you are a 20% tax-payer is 20%x(4,000-1,080) = Stg584 (the transaction costs are deductible, we assume).  This does not make sense. Scenario 2. The same as scenario 1., but the shares are worth Stg60,000 by end-2016. Answer.  The total transaction costs are 2%x60,000 = 1,200 and so the taxable gain of 10,000-1,200 = 8,800 would result in a tax bill of 20%x8,800 = 1,760 and so the transaction costs are lower than the tax to be saved (a strict analysis would take into account only the present value of the tax to be saved), it makes sense to crystalise the gain.  We sell some day before the tax year-end, and re-invest the very next day. Scenario 3. The same as scenario 1., but the shares are worth Stg70,000 by end-2016. Answer.  The gain of 20,000 less costs would result in a tax bill for 1,500 (this is: 20%x(20,000 - 2%x70,000 - 11,100) ).  This tax bill will be on top of the dealing costs of 1,400.  But the gain is in excess of the annual exemption.  The strategy is to sell just enough of the holding to crystallise a taxable gain of just 11,100. The fraction, f%, is given by: f%x(70,000-50,000) - 2%xf%x70,000 = 11,100 ... which simplifies to: f% = 11,100/18,600 = 59.68%. The tax saved is 20%x11,100 = 2,220, versus costs of 2%x59.58%x70,000 = 835.52. This strategy of partial b&b is adopted because it never makes sense to pay tax early ! End.