Super-deduction in periods spanning 31 March 2023

We've provided the following guidance to help you with super-deduction claims for accounting periods that span 31 March 2023.

Claiming super-deduction

If the company's accounting period ends on or after 1 April 2023, to provide context according to HMRC's Work out what you can claim for super-deduction or special rate first year allowances guidance you'll need to calculate the percentage that can be claimed as an uplift (as opposed to the standard 130%).

note

For short periods or those not ending on a month end, you'll need to calculate these rates following HMRC’s guidance.

When you enter additions, the 130% will be applied, but you'll need to adjust the actual allowances claimed in the

First Year Allowance (130% FYA)

Capital Allowances window . When you adjust the allowances, a message will appear on the computation under the General pool stating

Disclaimed Allowances

” with an explanation that £[amount] allowances have been disclaimed.

We recommend that you add an explanation to Additional information
to clarify this and include the calculation of the amount claimed.

There are 3 different scenarios. We recommend that you refer to the HMRC’s Examples for super-deduction and special rate first year allowance guidance when calculating the proceeds or balancing charges.

If you find that Writing Down Allowance is not being claimed after 1 April 2023, check that the computation parameters are set up as follows:

Computation parameters in the CA Rates tab
Asset type	Start Date	End Date	FYA %	EZ FYA %	WDA %
Special Rate Assets	01/04/2019	31/03/2021		100	6
	01/04/2021	ongoing	50	100	6
Environmentally-friendly Assets	01/04/2012	ongoing	100		18
Business Premises Renovation	01/04/2012	ongoing	100		18
Low CO2 Emissions Cars	01/04/2012	ongoing	100		0
General Pool	01/04/2012	31/03/2021	0	100	18
	01/04/2021	31/03/2023	130	100	18
	01/04/2023	ongoing	100	100	18