BIM71105 - Computation of liability: previous year basis - 1996-1997 transitional rules


Where a trade commences before 6 April 1994 there are transitional basis period rules for the tax year 1996-1997.

This paragraph explains:


  • the general transitional rule for 1996-1997
  • the treatment of losses
  • special rules where no accounting date falls in 1996-1997
  • special rules where 1995-1996 assessment on actual basis
  • transitional relief included in overlap relief given under ‘current year’ basis.

General transitional rule for 1996-1997

The general rule is that the transitional basis period for 1996-1997 is the aggregate of two separate periods:


  • a ‘notional current year basis period’ for the year – this is the 12 months to the date to which accounts are made up in 1996-1997, and
  • the ‘relevant period’ – this is the period beginning immediately after the end of the basis period for 1995-1996 and ending immediately before the beginning of the ‘notional CY basis period’ given above.

The profit assessed for 1996-1997 is the ‘appropriate percentage’ of the profits of this transitional basis period. This percentage is derived from the fraction 365/n where ‘n’ is the total number of days in the transitional basis period.


Example 1: no change of accounting date

Accounts made up to 30 June for many years. Basis periods are:

1995-1996 (PY) – 12 months to 30 June 1994

1996-1997 (Transitional year) – 24 months to 30 June 1996 (12 months to 30 June 1995 + 12 months to 30 June 1996) – profits assessed are 365/731 or 12/24 (50%) of the profits for this basis period

1997-1998 (CY) – 12 months to 30 June 1997.


Example 2: change of accounting date during transitional year

Accounts made up to 30 April for many years. The accounting date is changed to 5 April during the 1996-1997 transitional year. Basis periods are:

1995-1996 (PY) – 12 months to 30 April 1994

1996-1997 (Transitional year) – 35 months to 5 April 1997 (23 months to 5 April 1996 + 12 months to 5 April 1997) – profits assessed are 12/35 (34.3%) of the profits for this basis period

1997-1998 (CY) – 12 months to 5 April 1998.


Transitional rules - treatment of losses

Losses are aggregated with profits in computing the profits of either the ‘notional CY basis period’ or the ‘relevant period’. But an overall loss in one of these periods is not aggregated with a profit in the other.

If either the ‘notional CY basis period’ or the ‘relevant period’ shows an overall loss that loss is treated as ‘nil’ when aggregating the two periods to determine the profit of the transitional basis period for 1996-1997. The relevant legislation in FA94/SCH20 refers to aggregating the profits of each period and makes no reference to losses.

Treating losses as ‘nil’ leaves the loss incurred available for use as loss relief.


Example 3: aggregation where no losses

The business profits / (losses) are:


12 months to 30 April 1995£15,000
12 months to 30 April 1996£17,500
11 months to 5 April 1997£17,000

1996-1997 basis period is 35 months to 5 April 1997 (23 months ‘relevant period’ to 5 April 1996 + 12 months ‘notional CY basis period’ to 5 April 1997).

Aggregate profits for these periods are £49,500.

Profits assessable for 1996-1997 are £49,500 x 34.3% = £16,971.


Example 4: aggregation where no overall loss

The business profits / (losses) are:


12 months to 30 April 1995£14,000
12 months to 30 April 1996(£6,000)
11 months to 5 April 1997£7,000

1996-1997 basis period is 35 months to 5 April 1997 (23 months ‘relevant period’ to 5 April 1996 + 12 months ‘notional CY basis period’ to 5 April 1997).

The profits for the ‘relevant period’ are £8,500 (£14,000 - (11/12 x £6,000))

The profits for the ‘notional CY basis period’ are £6,500 (£7,000 – (1/12 x £6,000)

Aggregate profits for these periods are £15,000.

Profits assessable for 1996-1997 are £15,000 x 34.3% = £5,145


Example 5: aggregation where there is an overall loss

The business profits / (losses) are:


12 months to 30 April 1995£5,000
12 months to 30 April 1996(£8,000)
11 months to 5 April 1997£6,000

1996-1997 basis period is 35 months to 5 April 1997 (23 months ‘relevant period’ to 5 April 1996 + 12 months ‘notional CY basis period’ to 5 April 1997).

The overall loss for the ‘relevant period’ is £2,333 (£5,000 - (11/12 x £8,000))

The profits for the ‘notional CY basis period’ are £5,333 (£6,000 – (1/12 x £8,000)

Aggregate profits for these periods are ‘Nil’ + £5,333 = £5,333

Profits assessable for 1996-1997 are £5,333 x 34.3% = £1,839

The losses not used in aggregation (£2,333) are available for loss relief purposes in the normal way.


Special rule where no accounting date falls in 1996-1997

Where there is a change of accounting date between 1995-1996 and 1997-1998 and no accounting date falls in 1996-1997, the transitional basis period is the aggregate of:


  • a ‘notional CY basis period’ – this is the 12 months ending on 5 April 1997
  • the ‘relevant period’ – this is the period beginning immediately after the end of the basis period for 1995-1996 and ending immediately before the beginning of the ‘notional CY basis period’ given above.

Example 6: no accounting date in 1996-1997

Trading accounts have been made up to 5 April for many years. The trader decides to change the accounting date to 30 April during the transition. Accounts are prepared as follows:

12 months to 5 April 1995

12 months to 5 April 1996

13 months to 30 April 1997

Basis periods are:

1995-1996 (PY) – 12 months to 5 April 1995

1996-1997 (transitional year) – 24 months to 5 April 1997 (12 months ‘relevant period’ to 5 April 1996 + 12 months ‘notional CY basis period’ to 5 April 1997) – profits assessed are 50% (12/24) of the profits for this basis period

1997-1998 (CY) – 12 months to 30 April 1997 (treated as a qualifying change of accounting date).


Special rule where 1995-1996 on actual basis

Where the basis period for 1995-1996 is 6 April 1995 to 5 April 1996 there is no ‘relevant period’ because there is no gap (and often an overlap) between the basis period for 1995- 1996 and any ‘notional CY basis period’ for 1996-1997.

In such cases the basis period for 1996-1997 is the tax year itself, 6 April 1996 to 5 April 1997. The normal CY basis period rules apply for the following year, 1997-1998.


Example 7: 1995-1996 on actual basis

A trade commenced on 1 January 1994. Accounts are made up to 31 December each year. The first tax year is 1993-1994. An election is made under old Section 62(2) ICTA 1988 for the actual profits of years 2 and 3 (1994-1995 and 1995-1996) to be assessed.

Basis periods are:


1993-1994 (PY rules)1 January 1994 to 5 April 1994
1994-1995 (PY rules)6 April 1994 to 5 April 1995
1995-1996 (PY rules)6 April 1995 to 5 April 1996
1996-1997 (transitional year)6 April 1996 to 5 April 1997
1997-1998 (CY rules)1 January 1997 to 31 December 1997

Transitional relief included in overlap relief

Transitional relief is given to continuing businesses to adjust for the fact that some profits would have escaped tax under the ‘previous year’ basis period rules because they fell within a gap between the basis periods for years leading up to cessation of trading.

For a continuing business some profits do escape tax under the averaging process in the transitional ‘current year’ rules for 1996-1997. A further adjustment is provided in the form of ‘transitional relief’.

The amount of transitional relief given in any case equals the profit (usually before capital allowances are deducted) between the end of the basis period for 1996-1997 and 6 April 1997. The exception is partners in a mixed partnership of individuals and companies, where the profit on which transitional relief is due is after adjustment for capital allowances.

Transitional relief is carried forward as if it were overlap relief and is relievable as overlap relief in the normal way, see BIM71075.

Where there is an overlap between the basis period for 1996-1997 and the basis period for 1997-1998, overlap relief is due in the normal way.


Example 8: calculation of transitional relief of sole trader

A sole trader’s basis periods are:


1996-199724 months to 31 December 1996
1997-199812 months to 31 December 1997

Transitional relief arises for the period 1 January 1997 to 5 April 1997 (95 days).

If the trader’s profit for 12 months to 31 December 1997 is £15,000 less capital allowances £3,000, the profit assessable for 1997-1998 is £12,000.

The profit of the transitional relief period is 95/365 x £15,000 = £3,904 (over 95 days).