Capital Allowance Schedules and Pool TWDV Records

TinyTax records the capital allowance amounts you claim each year — the AIA, FYA, and WDA figures you enter on your CT600 form — but it does not maintain a running pool schedule showing opening and closing Tax Written-Down Values (TWDVs) per pool.

This means TinyTax can confirm what was claimed in each year's filing but cannot generate a formal TWDV schedule with opening balances, additions, and closing pool balances.

What TinyTax Records

For each filed CT600, TinyTax stores:

Item	Stored?
Annual Investment Allowance (AIA) claimed	Yes
First Year Allowance (FYA) — e.g. zero-emission cars (100%)	Yes
Writing Down Allowance (WDA) — main pool (18%), special rate (6%)	Yes (amount claimed)
Balancing charges	Yes
Opening TWDV (brought forward from prior year)	No
Additions in the period	No
Closing TWDV (carried forward to next year)	No

The Tax Computation PDF attached to your CT600 shows the total capital allowances deduction, but does not include a pool-level schedule.

Tracking Pool Balances Yourself

You are responsible for maintaining a separate capital allowance schedule that tracks:

Opening TWDV — the pool balance at the start of the period (carried forward from the previous year's return)
Additions — new qualifying expenditure in the period
Disposals and disposal proceeds (if applicable)
Allowances claimed — AIA, FYA, or WDA
Closing TWDV — the balance carried forward to the next period

This schedule forms part of your working papers and feeds directly into each year's CT600 entry. Many filers maintain it in a spreadsheet or their accounting software.

Zero-Emission Cars (100% FYA)

Zero-emission cars are eligible for a 100% First Year Allowance. If you claim the full FYA on a newly purchased zero-emission car, the closing TWDV for that pool is nil — the full cost is written off in the year of purchase, so nothing is carried forward.

If you sell the car in a future year, a balancing charge arises equal to the proceeds (since the pool balance was nil). See Balancing Charges on Asset Disposals for how to enter this.

Finding What Was Claimed in a Prior Year

You can view your filed CT600 and Tax Computation PDF by going to your Dashboard, clicking your company, finding the relevant period, and downloading the PDF from the filing history.

The Tax Computation shows the total capital allowances claimed and how they reduce your taxable profit. If you need the pool-level breakdown (AIA vs. WDA vs. FYA), contact [email protected] with your company name and the accounting year end date — we can look up the individual entries from your filing.

Common Questions

I've lost my pool schedule — can you reconstruct it?

We can tell you what was claimed in each year's CT600 through TinyTax. We cannot tell you the opening pool balance (that came from your previous year's records) or the additions you made in the period. Combined with what was claimed, you can derive the closing TWDV for most pool types.

The Tax Computation PDF doesn't show individual pool rows

The computation summarises capital allowances as a single total deduction. The pool-level breakdown is in your own working papers.

My accountant needs the TWDV schedule

Your accountant will need your working papers (the schedule you maintain each year). If they need the specific claims entered in TinyTax, they can request a summary from you or contact us directly.

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